AN INFECTIVE ENDOGENOUS RETROVIRUS AND ITS ASSOCIATION WITH DEMYELINATING DISEASES AND OTHER DISEASES

Abstract: Retroviral sequences were characterised by RT-PCR with <i>gag</i> and <i>env</i> primers on RNA from RT-positive retroviral particles produced by multiple sclerosis (MS) derived B-lymphoblastoid cell lines. Sequence variants with high homology to the potentially functional subgroup RGH of the human endogenous retrovirus RTVL-H/HERV-H family were found. The same sequences were also specifically found in the particulate fraction of a series of MS patient plasma samples and were absent in controls. South-Western blots demonstrated the presence of a nucleic acid binding protein, corresponding in size and function to the nucleocapsid protein, Gag NC, of other retroviruses. Indications for transmission of the retrovirus to mononuclear blood cells from healthy human individuals and non-human animals were found. Cell cultures derived from peripheral blood from MS patients contained 5-15 % CD3+ T-cells and a specific splice variant of the <i>env</i> sequence comprising a region of the <i>pol</i> region was identified in such cultures.

Description: AN INFECTIVE ENDOGENOUS RETROVIRUS AND ITS ASSOCIATION WITH DEMYELINATING DISEASES AND OTHER DISEASES FIELD OF INVENTION The invention relates to the field of diagnosing and treating diseases associated with endogenous retroviruses. In particular, there is provided evidence that a retrovirus that is found in a majority of human patients suffering from demyelinating diseases such as multiple sclerosis is transmissible to human cells including mononuclear blood cells, and to non-human cells. Specifically, a specific splice variant comprising the env region and a part of the pol region is present in retroviral mRNA isolated from blood cells of MS patients and patients suffering from autoimmune diseases and malignancies, but not in mRNA isolated blood cells from healthy subjects. These findings provide the potential for novel approaches to diagnosing and treating such diseases. TECHNICAL BACKGROUND AND PRIOR ART Multiple sclerosis (MS) is a demyelinating inflammatory disease affecting the central nervous system. The aetiology of the disease remains uncertain. Epidemiological studies indicate that environmental agents contribute to the development of MS, the agents presumably being one or more viruses (Martyn, 1991 ; Christensen et al., 1994). This may also be indicated by the occurrence of putative MS clusters (Haahr et al., 1997). Following the observation of retrovirus-like particles in short-term cultured lymphocytes from MS patients, spontaneously formed cell lines from peripheral blood mononuclear cells from several MS patients have been established (Haahr et al., 1991). These cell lines produce type C retrovirus-like particles in addition to occasional expression of mature EBV particles (Sommerlund et al., 1993; Munch et al., 1995). These retrovirus particles possess reverse transcnptase (RT) activity (Christensen et al., 1997; Christensen et al., 1999) and share a few antigenic determinants with HTLV-1 , but are distinct from the known exogenous retroviruses at the antigenic level (Christensen et al., 1997). Endogenous retroviruses that are primarily transmitted vertically are found ubiquitously in the mammalian genome and constitute several percent of the genome. It has been suggested that endogenous retroviruses may play a role in autoimmune diseases (Hohenadl et al., 1979; Krieg et al., 1992; Dalgliesh, 1997). Only once before has a human endogenous retrovirus, HTDV/HERV-K, been clearly demonstrated as particles with possible pathological connotation - in teratocarcinoma cell lines (Tόnjes et al., 1996; Boiler et al., 1993). It has not yet been determined whether HTDV/HERV-K occurs as particles in patient plasma. The presence of variants of the human endogenous retrovirus HERV-H produced by MS cell lines has been reported in WO 99/53103. HERV-H sequences with high homology to the HERV-H variant RGH-2 were also found specifically at particle level in cell-free plasma from 24 out of 33 MS patients but could neither be demonstrated in 29 plasma samples from patients with autoimmune or other diseases nor in 20 plasma samples from healthy controls. It was found that nucleic acid binding proteins analogous to the nucleocapsid protein, Gag NC, of other retroviruses are found in the above retrovirus particles. Additionally, WO 99/53103 discloses methods of diagnosing demyelinating disease including MS, subgrouping patients suffering from such disease and/or monitoring the stage of activity of demyelinating disease including MS based on the detection, in a retroviral particle or an encapsidated virion-like particle, of the RGH virus-derived SEQ ID NO:1 disclosed in the above patent application, or a subsequence br variant thereof. Diagnostic agents comprising probes capable of hybridising to such sequences, subsequences or variants, antibodies reacting with epitopes or proteins or peptides encoded by the sequences, subsequences or variants and/or such epitopes for such methods are also disclosed in WO 99/53103. However, up till now there has been no evidence that could indicate that otherwise quiescent endogenous retroviruses occurring in the genome of MS patients may enter a replicative stage and thereby be transmitted to cells of healthy human subjects and to cells of patients suffering from a disease associated with the presence of endogenous retroviruses. The findings described herein are highly suggestive of the potential infectivity of endogenous retroviruses. Based on these findings, it is suggested that MS and possibly other diseases are associated with replication and transmissibility of otherwise quiescent endogenous retroviruses. This could be a phenomenon parallel to the association of HTDV/HERV-K with male germ cell tumours (Boiler et al., 1997; Tδnjes et al., 1996) and in accordance with the recent report of expression of another putatively endogenous retrovirus in MS (HERV-W/ERV-9) (Perron et al.; Garson et al.; Komurian-Pradel et al.) and of expression of a superantigen and of sequences in plasma, encoded by a HERV-K- variant (IDDMK1.222) in type 1 diabetes (Conrad et al.). RGH viruses belong to the RTVL-H/HERV-H (priming of transcription with tRNA His ) family of endogenous retroviruses. This family of type-C like retroviruses is related to the onco- retroviruses human T-cell leukemia virus (HTLV-1/-2), to bovine leucosis virus (BLV), and to ERV-9. A genomic RTVL-H clone which potentially encodes functional proteins has been described (Wilkinson et al.) and most interestingly, a HERV-H element with an intact open env reading frame (and highly homologous to RGH) has been described recently (Lindeskog et al., 1999; Blond et al., 1999). HERV-H/RTΛ/L-H RNA is found in normal lymphocytes, placental tissue and some neoplasias (Medstrand et al., 1992; Mager et al., 1987; Kelleher et al., 1996; Lower et al., 1993; Johansen et al., 1989), but RGH particles as such have not been reported previously, nor has their potential transmissibility. RGH is also separate from the RTVL-H viruses according to the classification based on LTR- types (Goodchild et al., 1993) as the RGH-2 LTR region contains three class 1 repeats rather than two (LTR type 1) or one (LTR type 1a and 2). Two RGH clones have been described: the published RGH-1 clone is 4869 bp long and encompasses a partial pol and an env-3'LTR region and thus lacks gag, whereas the published RGH-2 clone is 8715 bp long and includes the complete coding potential: 5'LTR gag-pol-env 3'LTR. The majority of cDNA clones isolated from MS patient material are closely related to the full-length clone RGH-2 as they contain gag sequences. RGH-like sequences were reported present in about 100 copies/haploid genome (Hirose et al., 1993). Using gag-primed PCR on a chromosomal DNA panel (Coriell Cell Repositories, USA) followed by sequencing, we have so far confirmed the presence of RGH-like sequences on chromosomes 6 and X in the human genome. An updated search in the human genome databases demonstrated RGH-2-homologous copies on chromosomes 2, 3, 5, 7, 10, 11, 14, 16, 19, X and Y. The retrovirus particles disclosed in WO 99/53103 possess reverse transcnptase activity and share a few antigenic determinants with HTLV-1, but are distinct from the known exogenous retroviruses at the antigenic level. They are associated with sequence variants of the human endogenous retrovirus HERV-H family, and amplicons obtained by RNA PCR have >80% homology at the nucleic acid level to the HERV-H clone RGH-2 (Hirose et al., 1993) and to the HERV-H clone with intact open Env reading frame described in Lindeskog et al., 1999. The retroviral particles are also described in: Christensen et al., 1997; Christensen et al., 1999; Møller-Larsen et al., 1998; Christensen et al., 1998; Christensen at al., 2000. Evidence is presented herein to the effect that endogenous retroviruses belonging to the RTVL-H/HERV-H family including RGH2 retroviruses appear to be transmissible to human blood cells. Additionally, it is demonstrated herein that not only are such endogenous retroviruses transmissible to other human cells than blood cells, but the viruses are also able to infect cells from other species, i.e. the are capable of acting as exogenous retroviruses in relation to non-human species. As disclosed in WO 99/53103 and discussed above, the HERV-H RGH2 sequences present in virus particles produced in MS cell lines or isolated from the blood of MS patients show >80% homology to the RGH-2 sequence and the HERV-H Env reading frame. As it will be described below, blood cells from MS patients, but not from healthy controls, contain an aberrantly spliced HERV-H env mRNA which may represent a genetic marker of cells producing or able to produce the infectious HERV-H RGH2 retrovirus particles. Furthermore, a comparison of a number of such aberrantly spliced mRNA molecules from different individuals provides indications that the genetic information encoding the mRNA may originate at a single endogenous HERV-H locus or at a small number of such loci. The implications of the above highly unexpected findings on which the present invention are based include that it may become possible to control demyelinating diseases and other diseases by designing appropriate effective antiviral or immunological treatment regimens for such diseases. Additionally, the findings provide the basis for providing improved diagnostic or prognostic methods. SUMMARY OF THE INVENTION Accordingly, the invention pertains in a first aspect to a human endogenous retrovirus belonging to the RTVL-H/HERV-H family in isolated form or in retroviral particle form that is capable of infecting a mononuclear cell and of replicating therein. In a further aspect the invention provides a method of detecting intra-species infectivity (transmissibility) of such a retrovirus, the method comprising the steps of isolating the retrovirus from a patient suffering from a demyelinating disease such as multiple sclerosis, a patient suffering from an autoimmune disease, a patient suffering from diabetes or a patient suffering from a malignancy, contacting said isolated virus with a culture of mononuclear cells derived from a human subject not suffering from any of the above diseases, and detecting infection of at least a proportion of the mononuclear cells with the retrovirus. In a still further aspect, there is provided a method of detecting inter-species infectivity (transmissibility) of the retrovirus as defined above, the method comprising the steps of isolating the retrovirus from a patient as also defined above, contacting said isolated viruses with a culture of mononuclear cells derived from a non-human individual, and detecting infection of said cells with the retrovirus. Further objectives of the invention are to provide: a culture of mononuclear cells derived from a human subject selected from the group consisting of a multiple sclerosis (MS) patient, a patient suffering from an autoimmune disease, a patient suffering from diabetes and a patient suffering from a malignancy, said cells are capable of expressing a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease encoding (pol) region of said retrovirus; a method of diagnosing a disease selected from the group consisting of multiple sclerosis, an autoimmune disease, diabetes and a malignancy, the method comprising isolating mononuclear blood cells from a patient suspected of suffering from any of said diseases and detecting in said cells a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease encoding (pol) region of said retrovirus, including a mRNA sequence comprising a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof; a method of diagnosing a disease associated with the retrovirus according to the invention, the method comprising the steps of isolating the retrovirus from a human subject suffering from any of the above diseases and testing its infectivity according to the above methods; a method of treating a patient suffering from a disease, the clinical manifestations of which are associated with the presence of the retrovirus according to the invention, the method comprising administering to the patient an effective amount of a pharmaceutical agent that is capable of at least partially preventing the infection of cells in the patient with the retrovirus, adverse immunological responses to the infection and/or the migration of the retrovirus to cells in the patient that can be infected by the retrovirus; a method of treating a patient suffering from a disease, the clinical manifestations of which are associated with cells transformed (immortalised) by infection with the retrovirus according to the invention, the method comprising administering to the patient an effective amount of a pharmaceutical agent that is capable of at least partially eliminating such transformed (immortalised) cells; an antiviral agent for use as a medicament in the control of a disease, the clinical ' manifestations of which are associated with the presence of the retrovirus according to the invention; use of an antiviral agent in the manufacturing of a medicament for controlling a disease associated with the retrovirus according to the invention; a method of controlling a disease, the clinical manifestations of which are associated with immunological responses to the retrovirus of the invention, the method comprising administering to the patient an effective amount of a pharmaceutically active compound that is capable of at least partially inhibiting said immunological responses; and a pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially inhibiting in a human subject suffering from any of the above diseases an immunological response to the retrovirus according to the invention. In other aspects the invention relates to : a pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially preventing the infection of cells in a patient with the retrovirus according to the invention and/or the migration of the retrovirus to cells in the patient that can be infected by the retrovirus; a pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially eliminating in a patient cells transformed (immortalised) by infection with the retrovirus according to the invention; and the use of an allelically occurring spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease (pot) region of said RGH retrovirus as a marker for the occurrence or the state of a disease selected from the group consisting of a demyelinating disease including multiple sclerosis, an autoimmune disease, diabetes and a malignancy. DETAILED DISCLOSURE OF THE INVENTION It has been found previously that the presence of particles of endogenous retroviruses in blood cell cultures derived from MS patients may be associated with the disease, as similar virus particles cannot be found in healthy human subjects. The present invention is i.a. based on the unexpected finding that certain human endogenous retroviruses belonging to the RTVL-H/HERV-H family are capable of being transmitted to (infect) mononulear cells and of replicating therein. As it will be outlined in the following, this unexpected and surprising finding renders it likely that such infective retroviruses play a role in the development of demylelinating diseases, in particular multiple sclerosis, and possibly also in the development of autoimmune diseases such as e.g. diabetes, and malignancies. Accordingly, these achievements of the inventors imply that novel therapeutic approaches to the treatment of such diseases can be designed and additionally, the present findings can be the basis for improved diagnostic and prognostic methods. It is thus one objective of the invention to provide a human endogenous retrovirus belonging to the RTVL-H/HERV-H family in isolated form or in retroviral particle form that is capable of infecting a mononuclear cell and of replicating therein. In one specific embodiment such a retrovirus is a retrovirus that encodes a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease (pol) region of said RGH retrovirus. Such a retrovirus includes a retrovirus wherein the spliced mRNA sequence comprises a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. By the term "subsequence" is meant a sequence which comprises at least 10, 15, 20, 30, 40 or 50 nucleotides of any of the above specific sequences. By the term "variant" is meant a sequence which is not identical to any of these specific sequences, but which has a sequence identity of at least 80%, 85%, 90%, 95%, 98%, 99% or 99.5% with any of these sequences. These two terms may be combined, i.e. the invention comprises detection of a variant of any of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 which has a sequence identity of at least 80% with a subsequence of any of the sequences of at least 10, 15, 20, 30, 40 or 50 nucleotides. It will be appreciated that the person of skill in the art will know how to make subsequences and variants of the specific sequences, e.g. by deletion, substitution and insertion of one or more nucleotides. As used herein, the term "sequence identity" indicates that a given sequence is compared with a similar part of any of the above specific sequences. The best possible alignment of the sequences is made and then the degree of identity is calculated. A computer program such as GCG, Wisconson Package, Version 9.1 , Genetics Computer Group (GCG), 575 Science Drive, Madison, Wisconsin, USA 53711 using the defaults proposed in the program Bestfit with respect to gap weight (50), length weight (3), average match 10,000, average mismatch (-9,000) may be useful in this respect. All of such spliced mRNA sequences that were isolated had a size of about 950 bp and were spliced env mRNA sequences containing the same splice donor site in the leader region downstream from the PBS sequence and a splice acceptor site in the part of the pol that encodes the integrase. In these 950 bp fragments a region of 104 bp from the protease encoding region was inserted between the splice donor site and the splice acceptor site. The spliced mRNA sequences were detected in retroviruses isolated from MS patients and from a patient suffering from diabetes, whereas they could not be detected in healthy subjects. It was found that the 950 bp spliced sequences shared 87- 95% identity with the RGH2 leader/integrase and env region and 98-100% identity with each other and with a previously published sequence isolated from a human T-cell leukaemia cell line. An interesting finding was that, when 10 clones isolated from 3 MS patients and 1 patient with diabetes mellitus and representing 7 variants of the 104 bp protease encoding region of the 950 bp spliced mRNA sequences were aligned using one of the variants as the reference, it was found that one variant having, relative to the reference sequence, two similar substitutions could be isolated from 3 out the 4 source patients. This finding strongly indicates that the presence of these specific substitutions are markers of RGH alleles at the same genetic locus in the human genome or markers of closely related RGH genes at different genetic loci. As it will be appreciated, these findings imply that the presence of the 950 bp sequence in itself may be a marker for the presence of MS or other diseases and the fact that specific variants of the sequence appear to occur in an allelic manner suggests that such specific sequences and/or retroviruses comprising such sequences may be particularly interesting disease marker candidates. A retrovirus according to the invention can e.g. be isolated from a patient suffering from a demyelinating disease such as multiple sclerosis (MS), an autoimmune disease, diabetes mellitus or a malignancy including leukaemia, e.g. from blood cells, blood plasma or a cell culture derived from peripheral blood of said human subject. In this connection, it was found that blood cell cultures derived from such patients constantly comprised a significant proportion of a specific type of T-cells which were characterised according to CD antigens on their surface as being CD3+, CD4- and CD8- T-cells. The proportion of such T-cells in the blood cell cultures producing the retrovirus according to the invention typically is in the range of 1-20% of mononuclear cells, e.g. at least 2% including the range of 2-15%. Retroviruses according to the invention include retroviruses obtainable by ultracentrifugation of a cell culture supernatant or a cell-free plasma sample in Optiprep™ density gradient medium followed by recovery of the fraction containing intact retroviral particles. Protocols for purification of retroviral particles from cell culture supernatants or cell-free plasma samples using ultracentrifugation on an Optiprep gradient are provided in the accompanying Examples. Retroviruses according to the invention include human endogenous retroviruses of the RTVL-H/HERV-H family in isolated form. The term "isolated form" includes, but is not necessarily limited to, retrovirus purified from patient serum or a cell culture supernatant, for example using the protocols supplied in the accompanying examples. The retrovirus according to invention is, as it is demonstrated in the following examples, capable of infecting a blood cell derived from a human subject not suffering from MS, an autoimmune disease, diabetes or a malignancy, and of replicating therein. Additionally, it has been found that the retrovirus is also capable of infecting non-blood human cells such as e.g. liver cells. However, besides being capable of intra-generic transmission, the retrovirus is also capable of infecting a non-human cell, i.e. the retrovirus shows inter-generic infectivity. As it is demonstrated in the examples, the retrovirus can be transmitted to cells derived from bats, rabbits and rodents. In specific embodiments, the infective endogenous retrovirus according to the invention is an RGH virus including a retrovirus comprising a nucleic acid sequence that is at least 80% identical to the RGH-2 virus sequence published by Hirose et al., Virology, 1993, 192:52-61. In a further aspect the invention provides a method of detecting intra-species infectivity (transmissibility) of the endogenous retrovirus according to the invention. The method comprises that the isolated retrovirus is contacted with a culture of mononuclear cells such as blood cells derived from a human subject not suffering from MS, an autoimmune disease, diabetes or a malignancy, and detecting infection of said cells with the retrovirus. The detection of the infection can be carried out in several ways. Thus, in one way of detecting infectivity, the infection is detected by the appearance or increase of RT activity in the infected culture using methods for detection of RT activity which are known in the art including the very sensitive assays for detecting RT activity generally referred to as RT-PCR and Product Enhanced Reverse Transcriptase (PERT) assay, or by an assay based on co-cultivating of cells suspected of harbouring the infective retrovirus e.g. cell cultures from peripheral blood from an MS patient with a cell line harbouring a non- transmissible retroviral construct followed by an assay for rescue of the infecting retrovirus into indicator cells such as it is described in details in the following examples. In specific embodiments, the infection of the culture of mononuclear cells is detected by the appearance in cells of said culture of a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease (pol) region of said RGH retrovirus, including a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. In addition to the above assays, infection of cell cultures by the retroviruses of the invention, can be detected by the occurrence of clonal growth of the infected cells. It is also an objective of the invention to provide a method of detecting inter-species infectivity (transmissibility) of the endogenous retrovirus according to the invention. This method comprises the steps of isolating the retrovirus from a human subject suffering from a demyelinating disease, an autoimmune disease, diabetes or a malignancy, followed by contacting the isolated virus with a culture of mononuclear cells including blood cells derived from a non-human individual, and detecting infection of said cells with the retrovirus using any of the above methods for detection of infection of a cell with the retrovirus. In this method, the mononuclear recipient cells may be derived from any non- human animal such as a rodent, a rabbit or a bat. In certain preferred embodiments of the above methods for detecting infection with the retroviruses, the recipient mononuclear cells being contacted with the retrovirus are in the form of a culture of mononuclear cells that are pre-stimulated with a mononuclear cell stimulating compound including PHA. A further objective of the invention is to provide a culture of mononuclear cells derived from a human subject selected from the group consisting of a multiple sclerosis (MS) patient, a patient suffering from an autoimmune disease, a patient suffering from diabetes and a patient suffering from a malignancy, said cells are capable of expressing a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease encoding (pol) region of said retrovirus. In specific embodiments hereof, the culture comprises cells wherein the spliced mRNA sequence being expressed comprises a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. Such cultures include cultures comprising a proportion of CD3+, CD4- and CD8- T-cells. The proportion of such T-cells in the mononuclear cell cultures producing the retrovirus according to the invention is typically in the range of 1-20% of mononuclear cells, e.g. at least 2% including the range of 2-15%. One important objective of the invention is to provide a method of diagnosing a disease selected from the group consisting of multiple sclerosis, an autoimmune disease, diabetes and a malignancy. This method comprises as a first step the isolation of mononuclear blood cells from a patient suspected of suffering from any of such diseases followed by detecting in these cells the expression of a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease encoding (pol) region of said retrovirus including such a sequence that comprises a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. In WO 99/53103 specific RGH virus-encoded peptide antigens are disclosed that can be used as reagents in serologically testing human subjects for the presence of antibodies directed against such antigens. When using such antigens as reagents in testing MS patient and control subjects (C) in an ELISA assay it was found in WO 99/53103 that the specific antigens gave rise to an MS:C ER ratio in the range of 0.8 to 1.5. It is within the scope of this invention to apply antigenic components of the retrovirus according to the invention in a similar manner as diagnostic reagents. As an example, the specific novel peptide: LSDLSQISHLDSFSSNTKNPAQF gave rise to an MS:C ER ratio as high as 1.6 (8 MS sera vs. 8 control sera). In a further aspect, the invention relates to a method of diagnosing a disease associated with the retrovirus of the invention, the method comprising the steps of isolating the retrovirus from a human subject suspected of suffering of a demyelinating disease including multiple sclerosis, an autoimmune disease, diabetes or a malignancy, and testing its infectivity according to any of the methods defined above and explained in details in the following examples. Based upon the finding that endogenous retroviruses that are associated with diseases as mentioned above are infective for human cells, methods of controlling such diseases are contemplated. Accordingly, in one aspect, the invention provides a method of treating a patient suffering from a disease, the clinical manifestations of which are associated with the presence of the retrovirus according to the invention which method comprises administering to the patient an effective amount of a pharmaceutical agent that is capable of at least partially preventing the infection of cells in the patient with the retrovirus and/or the migration of the retrovirus to cells in the patient that can be infected by the retrovirus. In the present context, the term "migration" includes the targeting of the retrovirus to a susceptible cell in the body by the transfer of a cell harbouring the infective retrovirus to the susceptible target cell whereby the retrovirus may infect the susceptible target cell by cell-to-cell contact. Any compound that is capable of interfering with at least one step in the infection of new cells in the body, including compounds that, at least partially, eliminates the retrovirus- carrying immortalised cells, preferably in a selective manner, compounds that prevent or inhibit migration of such cells, compounds that interfere with the cell-to-cell contact or which interfere with the transmission of the retrovirus into the target cells (infection), can be used in the treatment methods of the invention. The compounds which can be used in such methods include antiviral agents, antibodies, anti-sense nucleic acids, nucleic acid binding proteins and ribozymes. It is conceivable that the clinical manifestations of diseases associated with the endogenous virus according to the invention, such as demyelinating diseases including multiple sclerosis, autoimmune diseases, diabetes and malignancies are associated with immunological responses to the retrovirus. Such an immune response may be "direct", i.e. directed against an antigen on the infected cell or "indirect", i.e. the immune response is directed against other cell antigens. Accordingly, the invention pertains in another aspect to a method of controlling the above diseases which comprises administering to a patient suspected of suffering from such a disease an effective amount of a pharmaceutically active compound that is capable of at least partially inhibiting such immunological responses. In this connection, useful compounds include compounds that inhibit cells of the immune system that are activated to generate the immunological responses. In a specific embodiment, the pharmaceutically active compound that is capable of at least partially inhibiting immunological responses to the retroviral infection is a compound that is directed against an immunological response elicited specifically by a retrovirus expressing a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease encoding (pol) region of said retrovirus including such a sequence that comprises a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. In yet other embodiments, the pharmaceutically active compound is a compound directed against inhibiting the biological activity of activated T-cells including CD3+, CD4- and CD8- T-cells or against eliminating such T-cells. In other aspects there are provided an antiviral agent for use as a medicament in the control of a disease, the clinical manifestations of which are associated with the presence of the retrovirus according to the invention and use of an antiviral agent in the manufacturing of a medicament for controlling a disease associated with such a retrovirus such as a demyelinating disease, a malignancy, diabetes and an autoimmune disease. In the present context, the expression "antiviral agent" should be understood in its broadest sense as indicating any compound that prevents or inhibits the infectivity and replication of the retroviruses and/or the pathological manifestations of the infection including adverse immunological manifestations, optionally resulting in an autoimmune state of the patient. The use of currently used antiviral agents is contemplated but it is conceivable that antiviral agents that selectively inhibits or eliminates the retrovirus according to the invention can be developed or selected from known antiviral agents. It is within the scope of the invention to use antibodies, anti-sense nucleic acids and ribozymes as antiviral agents. It is another objective of the invention to provide a pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially inhibiting in a human subject as defined in claim 4 an immunological response to the retrovirus according to the invention, including a composition wherein the pharmaceutically active compound is directed against an immunological response elicited specifically by a retrovirus according to the invention including a retrovirus expressing a spliced HERV-H RGH retrovirus env mRNA sequence as defined hereinabove and a composition wherein the pharmaceutically active compound is a compound directed against inhibiting the biological activity of activated T-cells including CD3+, CD4- and CD8- T-cells or against eliminating such T-cells. There are also provided a pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially preventing the infection of cells in a patient with the retrovirus according to the invention and/or the migration of the retrovirus to cells in the patient that can be infected by the retrovirus and a pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially eliminating in a patient cells transformed (immortalised) by infection with the retrovirus. Compounds having potential antiviral activity may be identified with the aid of a screening assay based on the production of retroviral particles from a culture of mononuclear cells. Compounds that inhibit production of retrovirus from cells which normally (i.e. in the absence of the compound) produce retroviral particles would be scored as having potential anti-retroviral activity. A typical assay may be carried out using a B- lymphoblastoid MS derived cell line established in culture. The cells are dispensed into the wells of a standard microtiter plate and produce virus particles in the cell culture medium. Virus particles may be detected by identifying their structure in Optiprep gradients prepared by ultracentrifugation. Candidate compounds are then added and the production of viral particles in the presence of the test compound analysed by suitable means. For example, production of intact viral particles may be analysed by ultracentrifugation on an Optiprep gradient. Typically, the effect of the candidate compound will be tested at several different concentrations. Inhibition of virus production is scored as an indication that the candidate compound has potential antiviral activity. Compounds identified as having potential antiviral activity using such a screening assay may be useful as antiviral agents or as lead compounds in the development of antiviral agents with pharmaceutical potential. In a further variation, screening assays for compounds having potential antiviral activity may be based on an infectivity assay. A typical assay may comprise exposing target cells susceptible to infection with a virus according to the invention, for example cultured PHA stimulating lymphocytes from healthy control subjects, to sample containing a retrovirus according to the invention in the presence or absence of a candidate compound. The sample containing the retrovirus may be, for example, a cell supernatant from a cell line which produces the retroviral particles (e.g. B-lymphoblastoid MS derived cell lines, as discussed above) or a cell-free plasma sample containing retrovirus. Candidate compounds which prevent or substantially reduce the infection of the lymphocytes by retroviral particles present in the cell supernatants are scored as having potential antiviral activity. Such compounds may again be useful as antiviral agents or as lead compounds in the development of antiviral agents with pharmaceutical potential. An infectivity assay may be based on the biochemical tests for indicating retroviral activation in PHA stimulated lymphocytes already established and described in the accompanying Examples. Cultures of MS derived cell lines producing infectious retroviral particles may also be used to identify compounds that prevent the synthesis of viral polypeptides, including those polypeptides that may act as a superantigen in the body, thereby triggering an autoimmune response. In a typical screen an immunoassay may be set up as a screening test using the cell lines themselves, or cell supernatants, indicating the production of the viral specific epitopes in the MS derived cell lines. In an important aspect the invention relates to the use of an allelically occurring spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease (pol) region of said RGH retrovirus as a marker for the occurrence or the state of a disease selected from the group consisting of a demyelinating disease including multiple sclerosis, an autoimmune disease, diabetes and a malignancy. In this connection, the expression "allelically occurring" indicates the presence of RGH alleles at the same genetic locus in the human genome or markers of closely related RGH genes at different genetic loci. In specific embodiments such use is based on mRNA sequences comprising a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. The invention will now be described in further details in the following non-limiting examples and in the figures wherein: Fig.1 shows examples of RGH sequences in particulate form from MS cell lines. RNA templates were from Optiprep-gradient purified retroviral particles from the MS cell lines MS1533, MS1845 and MS 1851. The corresponding sequences from RGH-2 (Hirose et al., 1993) are included in the alignment (above: RGH-2 1589 - 1 87 2 (SEQ ID NO:1); below: RGH-2 2141 _ 231 3 (SEQ ID NO:2) . The MS1533/MS1845 sequences (above) (SEQ ID NO:3/SEQ ID NO:4) were obtained with primer-set I; whereas the MS1533/MS1851 sequences (below) (SEQ ID NO:5/SEQ ID NO:6) were obtained with primer-set II. Clones appear to be true variants of RGH-2 (the full-length RGH clone), as the variation is too great to be attributed to the Taq error-rate. ... indicates gaps introduced to optimise alignment; Fig. 2 shows, as examples of RGH sequences in particulate form from MS patient plasma, env primed RT-PCR derived sequences from cell-free, filtered, ultracentrifuged plasma samples from the MS patients 2094 (SEQ ID NO:9) and 2095 (SEQ ID NO: 10). The corresponding sequences from RGH-1 (SEQ ID NO:7) and RGH-2 (SEQ ID NO:8) (Medsrand et al., 1992) are included in the alignment. Clones appear to be true variants of RGH-2 (the full-length RGH clone), as the variation is too great to be attributed to the Taq error-rate indicates gaps introduced to optimise alignment; Fig. 3 illustrates South-Westem analyses of ssDNA binding proteins in retroviral particles isolated from MS cell lines. Retroviral pellets obtained by ultracentrifugation of growth media from the indicated MS cell lines were analysed for the presence of ssDNA binding proteins by comparative South-Westem analysis. The M r marker is shown to the left. Left arrow: 35 kD protein also present in unconditioned medium with human serum (HS). j: triple ssDNA binding bands. Lane 1 : human serum, 2: MS1533, 3: MS1851 , 4: B95- 8(EBV + ), 5: C91-PL(HTLV-1 + ), 6: FLK(BLV +) , 7:MS1845, 8: C8166-(HTLV-1Δgag). The gels were run under conditions ensuring the best resolution in the low M r range, thus cross-reactivities for the higher M r proteins (> 40 kD) are poorly resolved. The three low molecular weight bands (M r 10-20 kD) in the MS cell lines are also found with the positive control retroviruses HTLV-1 and BLV, but the MS band pattern exhibits slight differences in size. The cell line C8166 contains three mutated HTLV-1 genomes and it is known that no expression occurs from the gag and env regions (Bhat et al., 1993). In the lane with the EBV-producing line B95-8 only two bands are present in the low M r region. The middle band of the three is absent, clearly demonstrating that this cannot be an EBV-related band. The primary reason for using B95-8 was to confirm that the middle of the low M r ssDNA bands of the MS cell lines is not of EBV origin, but it should be kept in mind that B95-8 contains some transmissible SMRV-H type D retrovirus-like sequences (Sun et al., 1995). The HTLV-1 tax gene product p40 Tax is a trans-regulatory protein containing other zinc-finger motifs. Tax-related bands would not be expected in this assay as p40 Tax is rarely packaged in virions; Fig. 4 are translations of the CX 2 CX 4 HX 4 C corresponding gag sequence regions. Sequences (upstream of the protease domain) from HTLV-1 (SEQ ID N0:11) and RTVL- H (SEQ ID NO:12) (Mager et al., 1987) and RGH-2 (SEQ ID NO:13) (Hirose et al., 1993) (translated) and examples of translated gag-primed RT-PCR derived sequences from Optiprep-purified retrovirus particles from the MS1533 donor (D) (SEQ ID NO: 14) and an infected recipient (R) (SEQ ID NO:15/SEQ ID NO: 16).* indicates termination codons indicates gaps introduced to optimise alignment. Note the high proline content. The motif CX 2 CX HX 4 C....CX 3 HX 4 C is conserved in both donor and recipient clones; Fig. 5 illustrates a Product Enhanced Reverse Transcriptase (PERT) assay indicating cell- free transmission of purified retroviral particles from long-term cell cultures from peripheral blood from MS patients using PHA-stimulated lymphocytes from healthy human individuals as recipient. The results are indicated as OD (PERT/10 6 cells) Fig. 6 illustrates another PERT assay indicating cell-free transmission of purified retroviral particles from long-term cell cultures from peripheral blood from MS patients using PHA- stimulated lymphocytes from healthy human individuals as recipient. The results are indicated as OD (PERT/10 6 cells); and Fig. 7 illustrates a PERT assay indicating cell-free transmission of purified retroviral particles from long-term cell cultures from peripheral blood from MS patients using PHA- stimulated lymphocytes from rabbit as recipient. The results are indicated as OD (PERT/10 6 cells). EXAMPLES 1-4 Materials and methods Cells All blood samples were obtained with informed consent. Heparinised blood was subjected to Ficoll-lsopaque density gradient centrifugation. The establishment of long-term cultured, spontaneously transformed cell lines from isolated mononuclear cells was performed as described previously (Munch et al., 1995). FLK-BLV (Foetal Lamb Kidney-Bovine Leucosis Virus)(BLV + ) was obtained from The National Veterinary Serum Laboratory, Copenhagen) and two HTLV-1 infected T-cell lines C91-PL (HTLV-1 + ) and C8166 (HTLV-1Δ gag) were obtained from the MRC AIDS Reagent Project, (London). The EBV-producing cell line B95-8 was obtained from ATCC. The cell lines were supplemented with foetal calf serum instead of human serum and were grown in a separate laboratory. Plasma All blood samples were obtained with informed consent. The samples were from healthy volunteers or patients from the Neurology Dept., Aarhus University Hospital; the Dermatology Dept., Marselisborg Hospital, Aarhus; the MS Hospital in Ry; or the Dept. of Internal Medicine, Middelfart Hospital (all in Denmark). Samples were drawn in the respective clinics and delivered by hand immediately after drawing. All samples were processed in our laboratory. Cell-free and debris-free plasma samples were obtained from 40 ml citrate blood samples (about 10 ml plasma). After an initial centrifugation, the plasma was aspirated and subjected to another centrifugation at 4°C, 30 min., 1000 x to pellet remaining cellular debris. Following aspiration, plasma samples were treated as described below. Particle RNA purification Retroviral RNA was purified from cell culture supernatants and from plasma samples: 1.3 1 suspension cultures were centrifuged at 4°C, 30 min. at 2500 x g. The cell-free supernatant was aspirated, underlayered with a cushion of 4 ml 50% Optiprep in NaCI/Hepes (Nycomed) in 60 ml tubes and ultracentrifuged at 4°C, 2 hrs. at 45.000 x g. Optiprep is an iodinated, non-ionic density gradient medium (Nycomed Pharma, Norway) which, in contrast to sucrose, maintains intact retroviral particles (Møller-Larsen et al., 5 1998). The cushion and proximal overlaying retrovirus-containing medium is mixed (5-6 ml), filtered through a 0.45 μm filter (Acrodisc 32, Gelman Sciences) to remove cellular debris, adjusted to 20% Optiprep and centrifuged in 11.2 ml Optiseal (Beckmann) tubes in a 0 Beckmann NVTi rotor at 364.000 x g for 3.5 hrs. 400 - 500 μl fractions (12 drops) were collected after centrifugation. RT activity was measured for each fraction and poly-A RNA was purified by lysing the 5-6 fractions with major RT activity directly in 5 volumes of lysis- binding buffer (Dynal, Norway), adding 100 μl beads/sample (mRNA Direct kit, Dynal, Norway) and following the manufacturer's instruction. 5 Cell-free plasma samples were layered on 50% Optiprep, ultracentrifuged and filtered as described above. The retrovirus/Optiprep mixture was directly lysed in 5 volumes of lysis- binding buffer (Dynal, Norway) and poly-A RNA was purified on 50 μl beads/sample using the mRNA-Direct kit (Dynal, Norway) as above. 0 If not used directly, the RNA-coupled beads were stored in 80% EtOH at -80°C. Before use, each RNA sample was treated with amplification grade DNAse (Life Technologies) according to the manufacturer's instructions. After cooling on ice the DNAse was removed by exchanging the buffer containing the RNA-complexed paramagnetic beads with DEPC- 5 treated ddH 2 0. Product enhanced reverse transcnptase (PERT) assay The ultrasensitive RT assays (PERT (Product Enhanced Reverse Transcriptase)). were 0 performed directly on 5 μl gradient fraction in 5 μl buffer A, essentially as described previously (Christensen et al., 1999; Lugert et al., 1996; Silver et al., 1993; Pyra et al., 1994). 5 RT-PCR. cloning and sequencing RT-PCR was performed using the GeneAmp RNA PCR kit (Perkin Elmer) according to the manufacturer's suggestions, except that 1 μ of Taq polymerase was used , per reaction. First strand synthesis was primed with random hexamers, in conjunction with the bead-oligo-dT complexed RNA-template. In some experiments, we ensured the integrity of the RNA template by cDNA synthesis, specifically primed with the downstream primer; in this case, control cDNA synthesis primed with the corresponding upstream primer was negative. Primer sets for PCR: initially, we used various retroviral consensus primers at low stringency conditions. The results lead us to assay for endogenous retrovirus sequences, following which we obtained positive results with the HERV-H/RTVL-H gag consensus primers of the endogenous retrovirus panel (Medstrand et al., 1992); the primers were kindly donated by P. Medstrand and J. Blomberg: 5'-CTTTTATTACCCAATCTGCTCCCGAYAT-3' (SEQ ID NO:17)/5'- TTAGTGGTGGACAGTCTCTTTTCCARTG-3' (SEQ ID NO:18). We then developed the RGH-specific primer sets for the gag (1, 11) and immediate upstream env regions: I: 5'-CGTTTACATATCACTCCCTTCCTAGTCTCTGT-3' (SEQ ID NO:19)/5'- GCATTAACCTTGACTATGTCTTTAGCTCCAG-3' (SEQ ID NO:20) (50°C) and/or II: 5'-ATTTTATTACCCAATCTGCTCCAAACAT-3' (SEQ ID NO:21)/ 5'- AGGTGAGTTGAACAGTCTGATTTTTA-3' (SEQ ID NO:22) (50°C); 5'-GATCCTCCCCACTGGGTTCACCATT-3' (SEQ ID NO:23)/ 5'- GGAAGTATTGGAGGGTGCCCTGCC-3' (SEQ ID NO:24) (60°C). All reactions were run in a Perkin Elmer DNA Thermocycler. Conditions for first strand synthesis: 5 min. at room temperature, 45 min. at 42°C and 5 min. at 95°C followed by cooling to 4°C.PCR: one cycle 2 min. at 95°C was followed by 45/50 cycles with annealing temperatures as indicated in brackets above: 1 min. at 94°C, 2 min. annealing, 3 min. at 72°C with 10 s extension. This was followed by a final extension 7 min. at 72°C. In each assay, water controls corresponding to each step were included together with duplicates of each reaction without RT to ensure that no DNA-templates were amplified. PCR products were analysed by agarose gel electrophoresis, and each product was cloned in pUC using the SureClone Ligation kit (Pharmacia) and sequenced using the ABI Prism kit (Applied Biosystems) using an automatic sequenator (ABI 377). South-Western analyses 60 ml suspension cultures were subjected to initial centrifugation as described above; viral particles were pelleted by ultracentrifugation at 70.000 x g at 4°C for 1 hr (SW41 rotor/Beckmann), resuspended in 20 μl Tris-HCl pH 8, 0.1% Na-azide and kept at 4°C until use. Protein concentration for each sample was determined by a colorimetric assay (Bio-Rad protein assay). Before SDS polyacrylamide gel electrophoresis (SDS-PAGE) half of each sample was subjected to immunoprecipitation to remove any co-purified EBV particles. 1/10 volume of a solution containing 2,5 M NaCl, 50 mM Na-borate pH 9 and 10 μg/ml of each of the antibodies 9243 and 9247 (anti-EBV membrane and capsid, Dupont) was added to each sample and the mixture was incubated at room temperature 15 min. At this point 1 ml protein A Sepharose suspension (6MB, Pharmacia) in 100 mM Tris-HCl pH 8 was added. After 10 min incubation at room temperature the mixture was centrifuged at 12.000 x g at 4°C for 5 min to precipitate protein A sepharose-antibody-EBV complexes. The supernatant was subjected to lysis by adding 1/3 volume of lysis-buffer: 3% NP-40, 0.3% SDS, 3% Triton-X- 00, 450 mM NaCl and 150 mM Tris-HCl pH 7.5. Equal amounts of protein from each lysed viral sample were subjected to SDS-PAGE on 4-20% NOVEX gels. A prestained Mr marker (Sigma) was co-electrophoresed on each gel. Positive controls were BLV and HTLV-1. Other controls were culture medium and B95-8. All samples for SDS-PAGE were prepared by ultra-centrifugation. After electrophoresis the gels were electroblotted onto nitrocellulose filters (Millipore) in 62,5 mM Tris-HCl pH 8.3, 13,5 mM Glycin, 5% EtOH and 0.1%SDS. Electrophoresis and subsequent blotting was performed in a NOVEX Excell assembly. ssDNA probes were radioactively labelled with a Random Primed DNA Labelling Kit (Boehringer) and α-32P-dATP (Amersham) according to the manufacturer's recommendations. The template was EcoRI/SamHI digested λDNA (Boehringer). The probes were heat-denatured at 90°C 10 min before use. After blotting, the nitrocellulose filters were equilibrated in a buffer containing 0 mM Tris-HCl pH 7.0, 1 mM EDTA, 1 X Denhardts buffer, 50 mM NaCl, and incubated with radioactively labelled probe in the same buffer for 1 hr at room temperature. The filters were washed extensively in the same buffer, air dried and exposed to Fuji X-ray film (Santax) at -80°C. Transmission Lymphocyte samples isolated by Ficoll-lsopaque density gradient centrifugation of citrate blood from healthy volunteers were seeded and cultured as described previously (Munch et al., 1995) (10 7 cells/aliquot). Two μl PHA (Difco)/10 ml was added. After 2 days purified retroviral particles from an MS cell line, pelleted by ultracentrifugation, suspended in TNE and filtered was added (particles from 60 ml culture/aliquot), this representing a cell-free infection. The suspensions were cultured and examined in the microscope twice weekly and supernatant samples for PERT (Christensen et al., 1999) were collected regularly. Transmission of the retrovirus was considered successful when RT activity is observed concomitantly with the major appearance of clonal growth; this happens usually after about a month. Continuous clonal growth refers to an increased growth rate as illustrated by the need for feeding and subculturing 3 times a week contrasting feeding once a week without subculturing. This is accompanied by the occurrence of many cell-clusters (clones). The corresponding controls die out. These controls were parallel PHA-stimulated as well as untreated cultures of the recipient lymphocyte preparations for each transmission assay. Absence of contaminating cells from the donor culture was confirmed by chromosomal analysis (the transfer is from male donor to female recipient or vice versa). Retroviral particles from the supernatant of the established transmission cultures were concentrated and characterised by RT-PCR as described above. EXAMPLE 1 Identification of RGH sequences in retroviral particles produced by MS-derived cell lines B-Lymphoblastoid cell lines were established from venous blood from MS patients (Table 1.1). The cell lines arose spontaneously after long-term cultivation. All cell lines were tested for mycoplasma contamination and were found negative by repeated analyses. Particles were purified from cell culture supernatants by ultracentrifugation in Optiprep gradients. Their retroviral origin was confirmed by negative staining electron microscopy (EM) on each gradient fraction and by the sensitive PERT (Product Enhanced Reverse Transcriptase) assays (Christensen et al., 1999; Lugert et al., 1996; Silver et al., 1993; Pyra et al., 1994) also performed on each gradient fraction. The presence of RNA in the particles was demonstrated by chasing the culture with [5- 3 H]-uridine (Amersham) for 24 hrs before harvest, followed by TCA precipitation of each gradient fraction, and counting in a β-.counter. PERT activity, presence of retroviral particles in EM and RNA content co- located in the gradients (Møller-Larsen et al., 1998). Using RT-PCR on retroviral RNA templates isolated from cell culture supernatants with subsequent sequencing of the cloned amplicons, we initially identified several gag and env fragments with high homology to the human endogenous retrovirus HERV-H variant RGH-2 (Hirose et al., 1993) (Fig. 1) in the retroviral particles produced by the cell lines MS 1533, MS 1844, MS 1845 and MS 1851. The level of homology to RGH was in the range of 80-95%. The packaging of RGH RNA at particle level is clearly demonstrated in the material from cell lines by the co-migration in Optiprep gradients of retrovirus particles, morphologically identifiable by EM, and RT activity. Wistar rats immunised with purified, retroviral particles exhibit a specific serological response towards potentially immunogenic synthetic peptides translated from the HERV-H sequences but it remains, however, to be assessed whether all the retroviral proteins in the particles are encoded by HERV-H. The virion proteins may also be encoded by other retroviral sequences in the genome as heterologous RNA co-packaging in virions (Linial, 1990) is a well-known phenomenon. Furthermore, we tested MS cell line particle RNAs, purified by our standard procedure, using the recently reported ERV-9-MS related nested primer set ST1-1/-2 and RT-PCR conditions (Perron et al., 1997). The results were negative. Table 1.1. B-Lvmphoblastoid cell lines were established from venous blood from MS patients The cell lines were established as part of an extensive culturing series and arose after more than 2 months of cultivation. They are continuously growing. No external EBV source was involved. Their origin was confirmed by RFLP mapping and by HLA-DOβ typing (Christensen et al., 1997). Type No. of Sex Age, years Diagnosis Duration, years patients RGH positive by RT-PCR 1 F D 24 PP" (active 3 ) 2 Multiple sclerosis cell line ' 1 F 40 Benign MS 11 n=4 1 M° 30 Chronic prog. Myelopathy 7 1 M 33 RR e (active) 2 Multiple sclerosis plasma 6 F 16-50 RR (2 active) 1-11 n=24 2 M 50-52 9-15 5 F 34-56 SP' (2 active) 4-20 7 M 40-72 (2 active) 9->20 4 F 33-47 PP (3 active) 3-7 RGH negative by RT-PCR 1 F 35 RR 10 Multiple sclerosis plasma 1 M 30 1 π=9 1 F 34 SP 15 3 M 40-50 9-15 2 F 31-36 PP 2-5 1 M 36 6 Healthy control plasma 13 F 24-53 n=20 7 M 27-34 Patient control plasma 3 F 56-62 Diabetes mellitus n=29 5 M 50-63 1 F 42 Prurigo nodularis hide 1 M 68 Hairy cell leukaemia 2 F 35-61 Colitis ulcerosa 2 M 31-32 1 F 52 SLE° 1 F 55 Arteritis temporalis 1 F 53 Rheumatoid arthritis 4 M 47-61 1 F 63 Thryeotoxicosis 1 M 55 1 M 47 Sarcoidosis 1 M 50 Collagenosis 1 F 58 Polymyositis 1 F 76 Myelomatosis 1 M 58 Leukemia/lymphoma 1 F 72 Polymyalgia rheumatoides a AII MS patients had clinically definite MS. Chronic progressive MS with no stationary phase, and exacerbations in relapsing-remitting MS was defined as active MS. b female, °male, "primary progressive, Velapsing-remitting, 'secondary progressive, 9 systemic lupus erythematosus. EXAMPLE 2 HERV-H sequences specifically present in plasma from MS patients To determine if RGH-homolbgous sequences at particle level could also be associated with MS in vivo, we subsequently performed RT-PCR analyses on clinical specimens, i.e. cell-free, filtered, ultracentrifuged plasma samples from MS patients, from patients with autoimmune diseases, and from healthy controls. RNA extracted from particles isolated from plasma was assayed by RT-PCR with subsequent sequencing of the cloned amplicons. The results of the plasma RT-PCR and sequencing analyses are presented in Table 1.1. Examples of MS patient sequences are shown in Fig. 2 (SEQ ID NOS:9-10). Expression of RGH sequences at particle level was specific for MS (24 out of 33 cell-free plasma samples from MS patients). These sequences were absent in all of 29 cell-free plasma samples from patients with autoimmune diseases and in all of 20 cell-free plasma samples from healthy controls. Different RGH sequence variants were thus found both in the virus particles from cell line supernatants and in the particulate fraction of plasma from different MS patients. It is presently unknown how many of the genomic copies are transcribed or if complementation occurs between the molecules. EXAMPLE 3 Detection of HLTV/BLV Gag NC protein equivalents in retroviruses from MS cell lines by South-Western analyses To determine functional characteristics of proteins isolated from the particles, we searched for the Gag nucleocapsid (NC) protein, which contains zinc-finger domain(s) with the characteristic CX 2 CX 4 HX 4 C motifs, involved in the interaction between NC and RNA (or ssDNA). This motif is known to be present as one or two copies among retroviruses (Mager et al., 1987). Interestingly, this motif which occurs twice, but is imperfect in both motifs in RTVL-H (Mager et al., 1987) also occurs twice, but with one perfect copy in RGH. Two of the gag primer sets used in ourRT-PCR assay span this motif. Using the method outlined by Morozov et al., 1992, where electrophoretically separated proteins from particles are incubated with ssDNA under renaturating conditions we have demonstrated that a nucleic acid binding protein, equivalent to the Gag NC proteins of HTLV and BLV, is also present in the retrovirus from 3 MS cell lines assayed (Fig. 3). Several data indicate, that the middle of the three ssDNA binding bands present in the 10- 20 kD range corresponds to the retroviral nucleocapsid protein: the band-patterns for the MS cell lines (lanes 2, 3 and 7), HTLV-1 (lane 5) and BLV (lane 6) are similar; and the lack of a corresponding band in the lane with the EBV-producer B95-8 (lane 4) excludes that the middle band is of EBV-origin. Furthermore, when the same filter is used in a Western blot with HTLV-1 + serum, the p15 band corresponds exactly to the middle-band of the three ssDNA-binding bands of HTLV-1 (not shown). If EBV is removed by immunoprecipitation from the dissolved pellets prior to electrophoresis the band pattern observed in all retrovirus-infected cell lines were identical to the pattern found for non-precipitated material (not shown). The origin of the other two bands is not quite clear. The absence in C8166 (lane 8) of similar bands indicates that these bands may also have a retroviral origin. The origin of the 60 kD band in C8166 is not known. EXAMPLE 4 Transmissibility of retroviruses produced by MS cell lines In this Example the transmissibility of the retrovirus produced by the MS cell lines was investigated. As cell-free type-C-like retroviruses (HTLV-1) are capable of infection, albeit with low efficiency (DeRossi et al., 1985), purified particles from MS cell lines were used to infect cultured, PHA-stimulated lymphocytes from healthy human individuals. Concomitant occurrence of RT-activity and continuous clonal growth in 8 out of 23 experiments in which the retrovirus was attempted transmitted to PHA-stimulated lymphocytes from healthy human individuals was interpreted as an indication of transmission, substantiated by the lack of activity and growth in the respective control cultures. Continuous clonal growth refers to a highly increased growth rate accompanied by the occurrence of many free-floating clusters (clones) of cells together with free single blast-like cells. The corresponding controls die out. In these experiments, we have demonstrated the presence of RT activity and clones in 8 out of 23 independent infections using MS1533, MS1844 or MS1874. All corresponding controls remained untransformed and without RT activity. RGH sequences have been demonstrated in gradient-purified retroviral particles produced from three of the independent putatively transformed cell cultures (two with MS1533, one with MS1844) more than one month after infection. RGH sequences from donor and an infected recipient are shown in Fig. 4. The differences between presented donor and recipient sequences do not exclude transmission as the RGH variants constitute a population of molecules (at least in the donor) rather than a single sequence. Interestingly, the CX 2 CX 4 HX C motif is better conserved in the isolated clones from both donor and recipient than in RGH-2. The absence of transformation of any of the PHA-stimulated control cultures and the particle production in the infected recipients are indicative of transmission. Discussion of Examples 1-4 In the above examples a specific association between MS and the endogenous retrovirus family HERV-H has been demonstrated. The RGH-homologous variants were demonstrated at particle level in supernatants from 6 MS-derived cell lines. We have also demonstrated RGH in particulate form specifically in the plasma from 24 out of 33 MS patients. Indications that this endogenous retrovirus may be transmissible is demonstrated by the cell-free transmission of purified virions to lymphocytes from healthy individuals. The activation of endogenous sequences already present in the recipient can not be ruled out, but we consider it doubtful that such an activation could be due to EBV. EBV is unlikely to co-purify with the retrovirus, and spontaneous EBV transformation of the healthy lymphocytes seems implausible as i) by no means all healthy lymphocyte samples are activated/infected, ii) the cells are cultured for a short time (4-8 weeks), iii) we observe clonal growth and RT activity concomitantly, and iv) the controls all die out. Previously, we have demonstrated a correlation between MS disease activity and the presence of cross-reacting antibodies towards an HTLV-1 -derived Env polypeptide. This serological study included 48 MS patients, 19 patients with other neurological diseases and 57 healthy controls. Serologic cross-reactivity towards the HTLV-1 -derived Env polypeptide was found in more than 60% of the MS sera (Christensen et al., 1999). We have also used PERT-assays on fresh plasma from MS patients and controls and showed that 7 of 17 MS patient samples had measurable RT activity whereas all 21 controls were negative (Christensen et al., 1999). A recent study demonstrated the absence of serological reactivity towards HTDV/HERV-K Gag, an MMTV/type-D like retrovirus in MS patient sera (Boiler et al., 1997). Recently, it was reported that ERV-9/type-C-related (MSRV) sequences are present in plasma samples from 5 MS patients (Perron et al., 1997) and in serum from 9 out of 17 MS patients vs 3 out of 44 controls (Garson et al., 1998). As the published MSRV consensus sequence (2304 bp) (Perron et al., 1997) is about 90% homologous to several human genomic sequences, i.e. AC000064 and U85196, MSRV may be exogenous but is most likely an endogenous ERV-9 variant. Alternatively, MSRV could belong to the recently described HERV-W family (Blond et al., 1999). Even though we could not demonstrate such sequences in particles from the MS cell lines, the fact that HERV- H/RGH-2 and MSRV/ERV-9/HERV-W belong to the same subsection of the type-C oncovirinae may indicate that we are looking at two aspects of the same phenomenon. Retroviral association has been reported recently for several autoimmune diseases: in addition to the previously mentioned implication of a HERV-K variant in insulin dependent diabetes mellitus (IDDM) (Conrad et al., 1997), in Sjόgren's syndrome, pol sequences from a putative exogenous type-D-like retrovirus were found in salivary glands (Griffith et al., 1997); in another study, the pol sequences from a putative exogenous type-D-like retrovirus were found in lymph nodes (Yamano et al., 1997); in a systemic lupus erythematosus study seroreactivity towards short, type-C-like endogenous retroviral Env peptides and a HTLV-1 -de rived Gag peptide was described (Bengtsson et al., 1996). Finally, in rheumatoid arthritis, differential expression of multiple endogenous retroviral pol sequences in synovial fluid cells where RTVL-H sequences were absent, has been reported (Nakagawa et al., 1997). It is suggested that MS is associated with production of otherwise replicatively quiescent endogenous retroviruses. Whether this represent a causal factor by eliciting an autoimmune response is not fully substantiated yet. However, in the study presented here, the presence of HERV-H/RGH sequences at particle level is clearly MS specific. This could indicate a direct and specific implication in the disease process, also because all plasma samples from MS patients with active disease were HERV-H/RGH positive. In the case of MS, the epidemiology of the disease implies that if replication of endogenous retroviruses is a causal factor, the activation mechanism(s) is/are likely to be of external origin. Suggestive possibilities are interactions with an as yet unidentified exogenous retrovirus and/or, as we and others have previously suggested, a member of the herpes virus group. Interactions through RT with non-retroviral RNA viruses (Klenerman et al., 1997) presents another possible role for expressed endogenous retroviruses. EXAMPLES 5-8 Introduction In the following examples it is demonstrated further that retroviral particles associated with sequence variants of the human endogenous retrovirus HERV-H/RGH and produced by spontaneously formed long-term cell cultures from peripheral blood mononuclear cells from several MS patients, can be transmitted to other, i.e. non-blood human cells and non-human cells. It is also shown that these long-term cell cultures consist of a mixed population of mainly B cells, and a smaller fraction of CD3+, CD4-, CD8- T cells. EXAMPLE 5 Intra-species transmission of RGH/HERV-H retrovirus particles Intra-species transmission was demonstrated by co-cultivation of long-term cell cultures from peripheral blood from MS patients with a retroviral vector construct-harbouring cell line followed by assays for reverse transcriptase (RT) activity and assays for rescue of the retroviral vector-construct in indicator cells. Briefly outlined, the principles behind this co- cultivation assay are as follows: Transmission of retroviruses is to some extent dependent on cell-to-cell contact; i.e. cell-free transmission is possible, but occurs at a low frequency (de Rossi et al., 1985) (see Example 6). Co-cultivation of LacZ-donor cells with retrovirus producing cells allows cell-to-cell contact in the initial stage of the assay described below. LacZ-donor cells harbour a retroviral vector- construct with the LacZ marker-gene. This construct is not transmissible in itself, but can be mobilised in trans. The LacZ-donor cells are co-cultivated with cells that produce retroviral particles. If the LacZ-donor cells are productively infected with retrovirus, a proportion of the subsequently produced infectious retroviral particles will contain the (mobilised) construct. These retroviral particles are produced into the co-cultivation supernatant. Upon addition of this supernatant (with retroviral particles but completely depleted for cells by filtration) to indicator cells that do not harbour the construct, (cell-free) retroviral infection of these indicator cells will transduce the retroviral vector-construct to the indicator cells. When the indicator cells are fixed and stained, blue cells will only occur if the gene-product (β- galactosidase) of the LacZ marker gene is present, and the LacZ marker gene will only be present if a retroviral infection has transduced the LacZ marker gene from the LacZ-donor cells through an infectious retroviral particle to the indicator cells. The main principles of the assay are described in Porter et al., 1998. Monitoring of transmission is performed by assaying for blue indicator cells and/or increase/lack of decrease in RT-activity. PERT assays measured via OD values show that RT acitivity for the produced retroviral particles in the supernatant without de novo particle production decreases about 3-fold after 3 days at 37°C, reflecting degradation. The results described below are interpreted as follows: No blue cells and decrease in RT activity: no transmission; No blue cells and increase/lack of decrease in RT activity: possible transmission as there is de novo production of retroviral particles; construct may not be mobilised; Blue cells and decrease in RT activity: possible transmission as construct is mobilised; retroviral production may be low; Blue cells and increase/lack of decrease in RT activity: transmission. The retrovirus producing long-term MS cell cultures are subcultured three times a week at a density of 0.5 x 10 6 cells/ml and cultivated in RPM1 1640 (Whittaker) supplemented with 200 i.u./ml penicillin (Leo), 0.2 mg/ml streptomycin (Rosco), 290 mg/ml glutamine (Sigma), 10 mM HEPES (Bioproduct) and 10% heat inactivated human serum (serum-pool obtained from the blood bank at Skejby Hospital, Denmark) in Costar bottles. The indicator cells are the human rhabdomyosarcoma cell line TE671 , and the LacZ-donor cells are TELacZ-cells. TELacZ is a clone of TE671 harbouring the MFGnlsLacZ retroviral vector (Takeuchi et al., 1994). TE671 and TELacZ are subcultured once weekly at a density of 0.5 x 10 6 cells/ml and cultivated in D-MEM (Dulbecco's modified Eagle's medium, Gibco, Life Technologies) supplemented with 5% FCS (foetal calf serum, Gibco, Life Technologies) and supplemented with 200 i.u./ml penicillin (Leo), 0.2 mg/ml streptomycin (Rosco) and 145 mg/ml glutamine (Sigma) in Costar bottles. For a standard transmission assay, 6-well trays (Falcon 1146, non-tissue culture coated) are coated with human fibronectin (Sigma F-0895) at 10 μg/ml in PBS (standard phosphate buffered saline: 150 mM NaCl, 150 mM Na-phosphate, pH 7.4) for 2 hrs at room temperature. The fibronectin is aspirated and the wells are blocked with 2% BSA (FAF, Boehringer Mannheim) in PBS for 30 min. Then the wells are washed in culture medium, and TE671 or TELacZ are seeded at 3 x 10 4 cells/2ml medium/well and incubated at 37°C in a C0 cabinet. Fibronectin facilitate the possibility of transmission through co-localization of virus particles and target cells (Williams, 1999) After 3 days, the medium is aspirated and the retrovirus producing MS cells are added (in their own growth medium but with 5% HS only) at 3 x 10 5 cells/2ml medium/ well. After addition of the MS cells, the trays are centrifuged at 185 x g at room temperature for 10 min. and the trays are incubated again at 37°C in a C0 2 cabinet. A typical experiment include the following duplicate cell combinations: TELacZ + MS cells + fibronectin ± wash; TELacZ + mock-infection ± fibronectin ± wash ; TE671 + mock-infection ± fibronectin + wash. The controls without fibronectin are trays blocked with BSA, or Costar bottles. After 5 days of co-cultivation, half of the wells are washed gently 3 times with PBS and all wells are supplemented with fresh medium (with 5% HS) up to 5-6 ml. This washing step removes most MS cells, but not the MS cells associated with the well walls or with the indicator cells. After further 3 days of co-cultivation, a 1 ml sample is taken from each well and prepared for RT-assay. The remaining culture from each well is aspirated and filtered through a 0.45 μm filter (Acrodisc, Gelman Science) (saturated with PBS). This cell-free supernatant is plated onto TE671 indicator cells in Nunclon gridded culture dishes (Nunc 169558A), 1-2 dish(es)/well. The indicator cells are seeded at 2.5 x 10 5 cells/5ml medium/dish the day before, and incubated at 37°C in a C0 2 cabinet. 3.5 ml medium is aspirated from the dish before the addition ofthe filtered, cell free supernatant. The dishes are then incubated at 37°C in a C0 2 cabinet for 4-5 days. The supernatants are aspirated from the dishes and a 1 ml sample is taken from each dish and prepared for RT- assay. The cells are fixed by addition of 5 ml/dish of 0.05% glutaraldehyde in PBS. The dishes are incubated for 15 min at room temperature and then washed twice in PBS. The cells are then histochemically stained for β-galactosidase expression by the following procedure: 2 ml stain solution is added to each dish and they are wrapped air- and light-tight and incubated at 37°C for 24 hrs. The stain solution is aspirated, and the dishes are washed twice with 5 ml PBS. 2 ml ddH 2 0 is added and the entire dishes are scored for blue cells by microscopy (Leitz Wetzlar microscope). The stain-solution is prepared immediately before use and consists of a 1 :40 dilution of 40mg/ml X-Gal (5-bromo-4-chloro-3-indolyl-α-D- galacto-pyranoside; Sigma) in DMSO in 5 mM K-ferro cyanide, 5 mM K-ferri cyanide, 2 mM MgCI 2 , pH 7. A typical time-chart for the assay can be outlined as follows (if all of LacZ-donor cells, retrovirus producing cells and indicator cells are in culture on day 1): Day 1 : Fibronectin coating of 6-well trays and seeding of TE621 and/or TELac; Day 3: Addition of retrovirus producing MS cells for co-cultivation; Day 8: Wash of wells; Day 10: Seeding of indicator cells in gridded dishes; Day 11 : Filtration and transfer of co-cultivation supernatant to indicator cells; RT samples; Day 15: Aspiration of supernatant from indicator cells; fixing and staining of cells; RT samples; Day 16: Scoring. Scoring can be performed both as positives/negatives and using multiplicity of infection (MOI). MOI can be determined from the proportion of uninfected cells (P) using the formula MOI = -(logP)/0.4343: the number of viruses leading to successful transduction events (n v ) as a fraction of the number of target cells (n c ) is the multiplicity of infection (MOI = n v /n c ). The probability of any cell for infection by one of the viruses is 1/n c , therefore the probability of any cell being uninfected (P)is [1- (1/n c )] πv . Thus, log P = n v - log [1 - (1/nc )]. If n c > 3 x 10 3 , n c • log [1 - (1/n c )] = -0.4343. MOI corrects for the non- linearity of a transmission assay with a simple positive-negative scoring. Alternatively, the specific activity of β-galactosidase can also be determined using the following quantitative photometric assay (Feigner et al., 1994): Cells are washed in PBS and lysed in 350 ml of 250 mM Tris-HCl (pH 8.0), 0.1% Triton X- 100, and the lysates are stored at -80°C for at least 1 h. To determine amounts of β- galactosidase, 50 ml of lysates and dilutions are combined with 50 ml of PBS, 0.5% BSA and 150 ml 60 mM Na 2 HP0 4 (pH 8.0),1 mM MgS0 4 , 10 mM KCI, 50 mM β- mercaptoethanol, 0.1% chlorophenol red galactopyranoside (Boehringer). After light- protected incubation at 37°C, absorption at 578 nm is measured and converted to pg of β- galactosrdase using a standard curve obtained with purified enzyme (Sigma). These values are standardised against the total amount of protein in each lysate. A 10-ml volume of lysate is combined with 150 ml of ddH 2 0 and 40 ml of Bio-Rad protein assay reagent. Absorption at 595 nm is converted to μg protein using a BSA standard curve. Specific activity is expressed as pg β-galactosidase/μg protein. Statistical comparisons could be performed by Student's t test. Assays for reverse transcriptase (RT) activity: RT is a retrovirus specific enzyme, which is present in retroviral particles. Monitoring of the RT activity thus constitutes a method for monitoring de novo production of retroviral particles. As the number of retroviral particles is very low, highly sensitive, PCR-based RT assays are necessary for measuring directly on small volumes, of supernatant. The general assays and the RT profiles of the MS long- term cell cultures have been described in Christensen et al., 1999. The ultrasensitive RT assays (RT-PCR or Product Enhanced Reverse Transcriptase (PERT)) are based on the conversion of an exogenous RNA template to amplifiable DNA by the sample-contained RT. The assays are performed essentially as described by Pyra et al., 1994: 1 ml aliquots of cell culture supernatant is obtained by aspiration. The samples are passed through a 0.2 μm filter (Sartorius Minisart) and centrifuged at 4°C 63.000 x g for 100 min (Sigma 3K-30) or 100.000 x g 1 hr in a SW 55 (Beckmann). Supernatants are aspirated and pellets suspended in 5 μl buffer A/ml aliquot of supernatant (buffer A: 50 mM KCI, 25 mM Tris-HCl pH 7.5, 5 mM DTT, 0.25 mM EDTA, 0.025% Triton X-100; 50% Glycerol). Samples must be taken and processed on the same day to prevent loss of RT activity. Samples in buffer A are stored at -70°C. The initial steps in the assay must be performed under RNAse-free conditions. Template (MS2 RNA, Boehringer Mannheim) and primer (RT-1 : 5'- CATAGGTCAAACCTCCTAGGAATG-3' (SEQ ID NO:25) are annealed before each assay by adding 0.28 pmol MS2 RNA to 9 pmol in a volume of 1.4 μl in an RNAse-free 0.5 ml Eppendorf-tube. RNA/primer is heated 95°C 5 min, incubated 37°C 30 min and cooled at 4°C (5 min), spun briefly and kept on ice during the next steps. 23.6 μl of a mixture containing 60 mM KCI, 60 mM Tris-HCl pH 8.3, 9.5 mM MgCI 2 , 12 mM DTT, 0.45% Triton X-100, 1 mM dATP, 1 mM dCTP, 1 mM dGTP, 1 mM dTTP and 0.15 μg BSA/μl is added together with 0.6 μl RNAse inhibitor (40 u/μl; Boehringer Mannheim). Then 3 μl resuspended pellet in buffer A is added and the mixture is covered with mineral oil for PCR, incubated at 37°C 5 hrs; 95°C 7 min and cooled at 4°C (5 min). PCR is performed on the RT reaction by adding 75 μl PCR buffer through the oil. (1.5 μl RT-1 (14 pmol), 1 μl dil RT-2 (25 pmol; RT-2: 5'-TCCTGCTCAACTTCCTGTCGAG-3' (SEQ ID NO:26), 1 μl boiled RNAse A (10 mg/ml, Boehringer'Mannheim), 1 μl Taq (Perkin Elmer, 5 u/μl), 2.8 μl 1 M KCI, 7.5 μl 100 mM Tris-HCl pH 8.3 and 60.2 μl ddH 2 0). The mixture is incubated 30 min at 37°C, followed by 25 cycles of 94°C 30 sec, 55°C 100 sec, 72°C 110 sec; cooled at 4°C 5 min all in a Perkin Elmer Cetus 480 Thermocycler. PERT assays can be performed with two variants of detection: either by hybridisation of amplified products with hapten conjugated oligonucleotides followed by ELISA, essentially as described or by adjustment to the TaqMan technology (Perkin Elmer Cetus). In the latter case an oligonucleotide labelled with two fluorescence dyes, (fluorescein at the 5' end (reporter) and rhodamine at the 3' end (quencher)) binding to the amplified MS2 sequence region between forward and reverse primers, was used as a probe. During PCR, the annealed probe is hydrolysed by the 5' nuclease activity of Taq polymerase, thereby enabling the differential measurement of emitted fluorescence in a spectrophotometer. Each sample is analysed in triplicate or duplicate and "blind" assay controls are included in all experiments. Positive controls are cloned RT enzymes (Life Technology or Boehringer). ELISA detection is performed as follows: NUNC 96-well titer plates are coated with 50 μl Avidin-solution 50 μg/μl in coating-buffer (200 mM NaCl, 100 mM Tris-HCl pH 7.4), wrapped light-tight and incubated at room temperature overnight. The plates are washed 3 times with 200 mM NaCl, 100 mM Tris-HCl pH 7.4, 0.3% Tween 20, blocked with 200 μl blocking-buffer in each well for 30 min at room temperature (200 mM NaCl, 100 mM Tris- HCI pH 7.4, 0.05% Tween 20, 20% FCS; washed 3 times and are ready for hybridisation: 25 μl of PCR-reaction are added to a 0.5 ml Eppendorf-tube with 10 μl hybridising-mix (0.625 μl RT-3Bio (10 pmol, 5'-TTAATGTCTTTA-GCGAGACGC-3' (SEQ ID NO:27), 0.4 μl 500 mM EDTA pH 8, 0.375 μl 1 M KCI, 0.15 μl RT-5Dig (10 pmol, 5'- ATGGCTATCGCTGTAGGTAGC-3' (SEQ ID NO:28), 1.0 μl 100 M Tris-HCl pH 8.3, 7.45 μl ddH 2 0), incubated 95°C 5 min, 45°C 30 min, cooled at 4°C (5 min) and 35 μl hybridisation-mix is added to each coated well, incubated 30 min at room temperature and the wells are washed 5 times. Then 50 μl Fab anti-digoxigenin (Boehringer Mannheim, dil. 625 x in TBS/0.5mM EDTA pH 8) is added to each well, incubated 1 hr at room temperature, washed 5 times and 50 μl substrate (p-nitrophenyl phosphate) is added in substrate-buffer (Boehringer Mannheim), incubated 20 min, and OD 405 is measured in an ELlSA-reader. Table 5.1. Examples of transmissibility assayed bv PERT-assays (OD) and β-galactosidase induction Nd: not done; na: not applicable; <1 '.numbers below cut-off-value; Fibronectin: cells cultured in fibronectin coated trays; wash: wells washed at day 8. MS1533, MS1845, MS1851, MS1874, MS1946 are long-term cell cultures from MS patients; C91-PL is a human cell line producing HTLV-1 ; Relative RT values around 1 and above indicates de novo particle production; MOI values for the MS cell cultures are typically about 10 "6 to10 "5 , for C91-PL they are around 10 "3 . EXAMPLE 6 Intra-species transmission of RGH/HERV-H retrovirus particles In this Example intra-species transmission was demonstrated by cell-free transmission of purified retroviral particles from long-term cell cultures from peripheral blood from MS patients to stimulated or non-stimulated peripheral blood lymphocytes from healthy individuals followed by assays for reverse transcriptase (RT) activity and characterisation of the transformed recipient cultures. Briefly outlined, the principles behind this cell-free transmission assay are as follows: Transmission of retroviruses is to some extent dependent on cell-to-cell contact; i.e. cell-free transmission is possible, but it occurs at a low frequency (de Rossi et al., 1985; Fan et al.,1992). Purified retroviral particles from long-term cell cultures from peripheral blood from MS patients are attempted transmitted to cultured, PHA-stimulated or non-stimulated lymphocytes from healthy individuals. Concomitant occurrence of RT-activity and continuous clonal growth in about one third of the experiments in which the retrovirus was attempted transmitted to such lymphocytes from healthy individuals was interpreted as indication of transmission, substantiated by the lack of activity and growth in the respective control cultures. Continuous clonal growth refers to a highly increased growth rate as illustrated by the need for feeding and subculturing 3 times a week contrasting feeding once a week without subculturing, accompanied by the occurrence of many free-floating clusters (clones) of cells together with free single blast-like cells. Transmission of the retrovirus is not always successful. Around one third of the recipient cultures will start to grow continuously as described above. Absence of contaminating cells from the donor culture is confirmed by chromosomal analysis of sex chromosomes (the transfer is from male donor to female or vice versa) The corresponding controls eventually die out. For chromosomal analysis, the cells are prepared for standard analysis: cells in growth phase are treated with colcemide (100 μl to 10 ml culture, incubated for 30 min at 37°C) for arrest of mitosis in the metaphase, then treated with hypotonic KCI (10 ml 0.56%) to 10 ml culture for 5 min) to spread the chromosomes, followed by fixation (in methanol.glacial acetic acid 3:1) and quinacrine banding (Q-banding): highly AT-rich DNA, such as poly(dA)-po!y(dT), markedly enhance quinacrine fluorescence while GC containing DNA quench fluorescence. (Dr. U. Friedrich, personal comm, see also Comings et al., 1975) before visualisation in the microscope. As an example, the presence of RT activity and clones was demonstrated in about one third of independent infections using 4 different retrovirus producing MS cell cultures. All corresponding controls remained untransformed and without RT activity. HERV-H/RGH sequence variants were demonstrated in gradient-purified retroviral particles produced from the putatively transformed cell cultures more than one month after infection. The set-up for an assay was as follows: lymphocytes were isolated from 50 ml citrate blood samples from healthy volunteers by Ficoll-lsopaque (Amersham) density gradient centrifugation (900 x gfor 30 min at room temperature), the cells were seeded and cultured as described in Example 5 (10 7 cells/aliquot). Six bottles were prepared of each, to three of which 2 μl PHA (Difco)/10 ml was added. After 2 days, purified retroviral particles from the supernatant from a long-term cell culture from an MS patient (100 ml culture supernatant/aliquot) was added to 4 of the bottles, this representing a cell-free infection. The MS cells were cultured as described in Example 5. They have a fluctuating and rather low yet continuous production of retrovirus particles. Retroviral particles from the cell cultures are released into the supernatants which were collected for retrovirus preparation and purification. Twenty-four hours before harvest of the supernatants, the cells were diluted with one third fresh medium to obtain optimal growth conditions and thereby optimal virus production. 400-500 ml of cell-suspension: 1.2 - 1.4 x 10 6 per ml was used for one round of virus purification: cells and cell debris were removed from the supernatants by centrifugation at 1000 x g for 30 min at 4°C. The supernatant was transferred to 60 ml Sorvall centrifuge tubes in volumes leaving sufficient room for underlying 4 ml of 50% OptiPrep cushion solution (OptiPrep is the trade name for lodixanol, an iodinated, nonionic density gradient medium from Nycomed Pharma, Oslo, Norway). OptiPrep leaves the retroviral particles intact, as opposed to sucrose. The tubes are centrifuged in a Sorvall rotor A641 at 45.000 x g for 2 h at 4°C and the supernatant removed from the tubes by aspiration, leaving a volume of 4-5 ml of the medium in immediate proximity of the cushion. The cushion and the overlying medium are mixed and the volume of the mixture is measured for final regulation of the concentration of the gradient which is optimal at 20% of OptiPrep. For dilution a buffered saline solution is used (0.8 % NaCl, 10 mM HEPES-NaOH, pH 7.4). The mixture is filtered through 0.45 μm (Acrodisc, Gelman Science) filters and transferred to 11.2 ml Ultraclear Tubes (Beckmann) and run in a near vertical rotor (Beckmann NVT 65) at 364.000 x g at 4°Cfor 3.5 h. Following centrifugation, the fractions were harvested in 0.5 ml aliquots by puncture of the bottom of the tubes. Fractions 2 - 5 were collected for use in the transmission assays. These fractions were pooled, diluted in buffered saline and pelleted by a final run in an SW41 rotor at 150.000 x g for 90 min at 4°C. The pellets were resuspended in 100 μl TNE buffer (50 M Tris pH 7.5, 100 mM NaCl, 1 mM EDTA). Usually, the pooled fractions were centrifuged-in 4 tubes, resulting in 400 μl of virus suspension which was added in 100 μl aliquots to 4 bottles prepared as described above. The suspensions were cultured and examined in an upside-down microscope (Leitz Wetzlar microscope) twice weekly and supernatant samples for PERT (see Example 5) were taken regularly. Transmission of the retrovirus is judged successful when RT activity is observed concomitantly with the major appearance of clonal growth; this happens usually after about one month. The corresponding controls eventually die out. These controls were parallel PHA-stimulated as well as untreated cultures of the recipient lymphocyte preparations for each transmission assay. Assays for reverse transcriptase (RT) activity were performed as described above. Retroviral particles from the supernatant of the established transmission cultures were purified by OptiPrep gradient ultracentrifugation as also described above and characterised by RT-PCR as follows: RT activity was measured for each gradient fraction and poly-A RNA was purified by lysing the 5-6 fractions with major RT activity directly in 5- 10 volumes of lysis-binding buffer (Dynal, Norway), adding 100 μl beads/sample (mRNA Direct kit, Dynal, Norway) and following the manufacturer's instruction. If not used directly, the RNA-coupled beads were stored in 80% EtOH at -80°C. Before use, each RNA sample was treated with amplification grade DNAse (Life Technologies) according to the manufacturer's instructions. After cooling on ice the DNAse was removed by exchanging the buffer containing the RNA-complexed paramagnetic beads with DEPC-ddH 2 O. RNA PCR (RT-PCR) was performed using the GeneAmp RNA PCR kit (Perkin Elmer) according to the manufacturer's suggestions, except that 1 u of Taq polymerase was used pr. reaction. First strand synthesis was primed with random hexamers, in conjunction with the bead- oligo-dT complexed RNA-template. In some experiments the integrity of the RNA template was confirmed by cDNA synthesis, specifically primed with the downstream primer; in this case, control cDNA synthesis primed with the corresponding upstream primer was negative. Primer sets for PCR: HERV-H/RGH-specific primer sets for the gag (1, 11) and immediate upstream env regions: I: 5'-d(CGTTTACATATCACTCCCTTCCTAGTCTCTGT)-3' (SEQ ID NO:29)/ 5'-d(GCATTAACCTTGACTATGTCTTTAGCTCCAG)-3' (SEQ ID NO:30) (50°C) and/or II: 5'-d(ATTTTATTACCCAATCTGCTCCAAACAT)-3' (SEQ ID NO:31)/ 5'-d(AGGTGAGTTGAACAGTCTGATTTTTA)-3' (SEQ ID NO:32) (50°C); 5'-d(GATCCTCCCCACTGGGTTCACCATT)-3' (SEQ ID NO:33)/5'- d(GGAAGTATTGGAGGGTGCCCTGCC)-3' (SEQ ID NO:34) (60°C). All reactions were run in a Perkin Elmer DNA Thermocycler 480. Conditions for first strand synthesis: 5 min. at room temperature, 45 min. at 42°C and 5 min. at 95°C followed by cooling to 4°C. PCR: one cycle 2 min. at 95°C was followed by 45/50 cycles with annealing temperatures as indicated in brackets above: 1 min. at 94°C, 2 min. annealing, 3 min. at 72°C with 10 sec extension. This was followed by a final extension 7 min. at 72°C. In each assay, water controls corresponding to each step were included together with duplicates of each reaction without RT to ensure that no DNA-templates were amplified. PCR products were analysed by agarose gel electrophoresis, and each product was cloned in pUC using the SureClone Ligation kit (Pharmacia) and sequenced using the ABI Prism kit (Applied Biosystems) using an automatic sequenator (ABI 377). Figures 5 and 6 are examples of the development of RT activity in two independent assays. The below Table 6.1 shows translation of HERV-H/RGH related sequences isolated from retroviral particles from donor and an infected recipient. Table 6.1. Translation of HERV-H/RGH related seguences isolated from retroviral particles from donor and an infected recipient PKKPPPNQPCFRCGKAGHWSRDCTQPRPPPGPCPLCQDPTHWKRDCPR HTLV-1 PPEPPPPGACYKCQKSGHWAKE*PQPRIPPKPCPICVGP.HWKSDCPT RTVL-H PPEPSPPGACYKCQKSGHWAKECPQTRIPPKLYPISVGP.H*KSDCST RGH-2 PSDPPPPASCFKCLKSGHWTKECPQPGIPPKDSPICAGP.HWKKDCPP 1533 D PPDPPPPGACYTCQKSGHWAKECPQRGIPPKPRPICVGP.H*KSDCST 3.10 R PPDPPPPGACYTCWKSGHWAKECP*PGIPPKPRPICVGP.H*KSDCST 3.03 R (HTLV-1: SEQ ID NO:35; RTVL-H: SEQ ID NO:36; RGH-2: SEQ ID NO:37; 1533 D: SEQ ID NO:38; 3.10 R: SEQ ID NO:39; 3.03 R: SEQ ID NO:40) The differences between presented donor and recipient sequences do not exclude transmission as the HERV-H/ RGH variants constitute a population of molecules (at least in the donor) rather than a single sequence. The absence of transformation of any of the PHA-stimulated control cultures and the particle production in the infected recipients are also indicative of transmission. EXAMPLE 7 Inter-species transmission of RGH/HERV-H retrovirus particles Inter-species transmission of RGH/HERV-H retrovirus particles was demonstrated by cultivation of PHA-stimulated or non-stimulated cells from non-human species with purified retroviral particles from long-term cell cultures from peripheral blood from MS patients followed by assays for reverse transcriptase (RT) activity. Details about the retroviral particles, details about PERT assays and details about the long- term MS cell cultures are as in Examples 5 and 6. In this example, the principles for inter- species transmission of retrovirus are outlined together with details of the the experimental set-up which are different from that described in the above Examples 5 and 6. Endogenous retroviruses are defined as being either xenotropic (i.e. do not infect cells of host, but are frequently able to infect other species), ecotropic (confined to host species, but may infect somatic cells within the species) or amphotropic (able to replicate in host and in distantly related species). Thus, endogenous retroviruses perse may or may not be infectious and, if infectious, may or may not be able to cross the species border. Many endogenous retroviruses are known to have spread to other species through horisontai transfer (Todaro, 1975) . Thus the putatively infectious HERV-H/RGH associated retroviral particles from the long- term MS cell cultures might also be able to infect cells from other species. To avoid any interference from genomic retroviral copies, the obvious choice of species for inter-species transmission assays are species, that are evolutionarily distinct from the host species of the endogenous retrovirus (human in this case), i.e species that diversified from the human/primate line before the endogenous retrovirus entered the germ line. Almost all HERVs entered the primate lineage around or after the divergence of Old World and New World monkeys (see Anderssen et al., 1997). Accordingly, rodent cells or virus-permissive rodent cell lines appear to be an obvious possibility. In contrast to the results obtained in assays for transmission to human cells, transmission attempts across the species barrier to cells (e.g. rabbit cells or other rodent cells or bat cells) in the set-up described below does not lead to continuous clonal growth (highly increased growth rate accompanied by the occurrence of many free-floating clusters of cells together with free single blast-like cells). Rather, a distinct, but transient peak in RT activity as measured by PERT assays is observed and is interpreted as indicative of transmission. Both putatively infected cells and uninfected controls eventually die out. Cell-free transmission of retroviral particles was assayed with rabbit lymphocytes: rabbit lymphocytes were isolated from 50 ml heparinised blood samples by Ficoll-lsopaque (Amersham) density gradient centrifugation (900 x g for 30 min at room temperature), the cells were seeded and cultured as described in Example 5 (5x 10 6 cells/aliquot). Alternatively, the culture medium was supplemented with heat inactivated rabbit serum rather than human serum. 4-5 bottles were prepared of each, to which 2 μl PHA(Difco)/10 ml was added. After 2 days purified retroviral particles from the supernatant from a long-term cell culture from an MS patient, (100 ml culture supernatant/aliquot) was added to 3-4 of the bottles, this representing a cell-free infection. Alternatively, filtered supernatant was added directly to the cells. The MS cells were cultured as described in Example 5. The putatively infected rabbit cells were cultured and monitored essentially as outlined in Example 6. The cells were examined in the upside-down microscope (Leitz Wetzlar microscope) twice weekly, and supernatant samples for PERT were taken regularly. Transmission of the retrovirus was considered possible, when RT activity is observed, usually developing a transient peak in RT activity over time. The control cells remain RT negative. An example is shown in Fig. 7. In another application of this assay approach, similar experiments were set up with freshly prepared murine spleen macrophages or with a virus-permissive bat lung cell line (CCL 88). In yet another application, transduction of the LacZ-construct (or a similar construct) as described in Example 5 would enable scoring of transmission by both RT-assays and by assays for induction of β-galactosidase activity. EXAMPLE 8 Analyses by flow cytometry of long-term cell cultures from peripheral blood from MS patients: characterisation of surface markers Different types of white blood cells can be characterised (and are often classified) by distinctive proteins on the cell surface: CD antigens (Cluster of Differentiation). Each CD antigen can bind monoclonal antibodies specific for that surface protein. By linking a fluorescent dye to the different antibodies it is possible to identify the different cells by the fluorescence they emit as they flow through a laser beam: so-called FACS analysis (fluorescence-activated cell sorting). The long-term cell cultures from peripheral blood from MS patients were further characterised using this technique. These cultures were originally defined as "MS cell lines" and, using immunocytochemistry, shown to be B-lymphoblastoid in nature as outlined in Sommerlund et al., 1993. The more sensitive flow cytometric analyses described below have shown that, whereas the majority of cells in the culture are B cells (CD19+), a small fraction of the cells are actually T cells (CD3+). Thus, the cell cultures constitute a mixed population of cell-types that are co-existing. It is thus possible that an interaction within the population is necessary for the active production of retroviral particles; alternatively, either the B cells or the T cells produce the retrovirus. The cells were characterised as follows: Cells from the long-term cell cultures from peripheral blood from MS patients were counted in trypan blue (standard procedure for viability). 1 x 10 s cells were placed in a V- shaped centrifuge tube and washed once in 10 ml RPMI 1640 (Whittaker)(centrifugation 400 x gfor 10 min at room temperature) and washed once in RPMI 1640 (Whittaker) supplemented with 2% foetal calf serum (FCS, Gibco, Life Sciences). The cells were resuspended and transferred to FACS-tubes (Struers-KeboLab 107 102-520), 500,000 cells/tube. The cells were spun down at 400 x g for 5 min at room temperature and the supernatant was discarded. Initially, a panel of different antibodies were tested: anti-CD3 (the cell receptor complex, T cells), anti-CD4 (accessory molecule in MHC II associated antigen recognition, subgroup of T cells, monocytes, macrophages), anti-CD8 (accessory molecule in MHC I associated antigen recognition, subgroup of T cells), anti CD-10 (common acute lymphoblastic leukaemia antigen (CALLA), haematopoietic stem cells), anti-CD14 (LPS complex receptor, B cells, monocytes, macrophages) anti-CD19 (regulation of proliferation, B cells) anti-CD45 (leukocyte common antigen), anti-CD56 (cell adhesion molecule, NK cells), and anti-HLA-DR (tissue type) (all antibodies from Becton Dickinson). It is possible to use more than one marker per tube when different fluorescent dyes are conjugated to the different antibodies. 20 μl of each antibody was added to the cells and the mixtures were incubated in the dark for 15 min. at room temperature, washed twice in PBS pH 7.4 (centrifugation as above). Then 500 μl 1 % formaldehyde in PBS was added while vortexing in a safety cabinet. The cells were kept refrigerated in the dark until reading in a flow cytometer (at the Immune- Haematologic Laboratory at Aarhus County Hospital, Aarhus Denmark). For the continuous testing the following antibodies were found relevant and important: anti-CD3, anti-CD4, anti-CD8, anti-CD19. The results were as follows: Most of the cells were identified as being CD 19+ cells, i.e. they are B-cells. A small fraction of all MS cell-cultures appeared to be CD3+ cells, i.e. are CD4- and CD8-. Examples of the precise percentages of the latter category are shown in the below table: Table 8.1. Proportion of CD3+ cells in long-term cell cultures from peripheral blood from MS patients Most T-cells in peripheral blood are either CD4+ or CD8+. The finding of CD3+ cells without these markers is an interesting observation. For further characterisation of the CD3+ fraction, separation of the two cell types, and an extended panel of antibodies will be necessary. EXAMPLE 9 Expression of HERV-H (RGH) mRNA splicing variants in mononuclear cells from MS patients. 1. Introduction and summary In this Example it is reported that spliced HERV-H mRNA sequence variants are expressed in vivo in cellular RNA from mononuclear cells from MS patients. The sequence variants were found specifically in cells from some of the blood samples from MS patients and autoimmune patients. The sequence variants were not found in mononulear cells from healthy controls. The endogenous HERV-H virus family consists of about 1000 defective members containing large deletions and stop codons, whereas 100 copies are approximately full length, potentially encoding functional proteins (Mager and Freeman 1987, Hirose et a/., 1993, Wilkinson et al., 1993) . One env sequence with an open reading frame has been isolated and transcribed in vitro (Lindeskog and Blomberg, 1999). Expression of HERV-H RNA in vivo has not been very well characterised though there is accumulating evidence that transcription occurs in normal as well as in malignant cells (Hirose et al, 1993, Lindeskog et al, 1993, Lindeskog and Blomberg, 1997). Splicing of HERV-H subgenomic transcripts has been described, revealing a complex pattern of multiply spliced mRNA species (Wilkinson et a/., 1990, Lindeskog and Blomberg 1997). Spliced HERV-H env mRNA sequence variants were demonstrated by performing RT-PCR analysis on clinical specimens: blood samples from MS patients, patients with different autoimmune diseases and healthy controls. Mononuclear cells were isolated, total cellular RNA were extracted and assayed by RT-PCR. Amplicons were cloned and sequenced. 2. Experimental All blood samples were obtained with informed consent from either healthy volunteers or from patients at the Neurology Dept., Aarhus University Hospital; the Dermatology Dept., Marselisborg Hospital, Aarhus; the MS Hospital in Ry; or the Dept. of Internal Medicine, Middelfart Hospital (all in Denmark). Blood samples were drawn at the respective clinics into VT-100SCPDA Venoject tubes containing 1.4 ml of CPD-adenine solution (Meda, Denmark) and delivered by hand immediately after drawing. All samples were processed immediately in the inventors' laboratory. Mononuclear cells were isolated by centrifugation as described in Example 6, washed two times in PBS (phosphate buffered saline, 150mM NaCl, 150 mM Na-phosphate, pH 7.4) and suspended in Trizol (TRIzol™Reagent, LifeTechnologies), 10 7 cells /ml. Extraction of cellular RNA was performed according to the manufacturer's instructions. If not used directly, the RNA pellets were stored in 80% EtOH (in DEPC-treated H 2 0) at -80°C. For RT-PCR analyses the RNA pellet was washed two times in 80% EtOH, air dried and suspended in DEPC-treated H 2 0, 50 μl per 10 7 cells. 7 μl were used for RT-PCR analyses. RNA aliqouts were stored at -80°C. RT-PCR was performed using the Superscript System (Superscript™ Preamplification System for First Strand cDNA Synthesis, Life Technologies). Before cDNA synthesis the RNA was treated with DNAsel (Deoxyribonuclease I, Amplification Grade, Life Technologies) according to the manufacturer ' s instructions, including Ribonuclease Inhibitor (Life Technologies), 0.01 U/μl, at relevant steps . All reactions were performed in a Perkin Elmer DNA Thermocycler model 2400. Following inactivation of DNasel by treatment with EDTA at 65°C, the RNA was annealed, 70°C 10 min, to a primer designed from the RGH2 sequence (Hirose et al., 1993): (i) 5'-GGGAATTAGTGGAATAACTCTTTTTTGTTG- 3' (SEQ ID NO: 41) (T m = 59.8°C) cDNA synthesis was performed using the conditions prescribed in the protocol and RNA was digested with RNaseH (Ribonuclease H, Life Technologies) before purification of the cDNA using a QIAquick PCR purification kit (QIAGEN) according to the manufacturer ' s instructions. The cDNA was eluted in the EB buffer 2 x 25 μl and stored as aliquots at -80°C, unless used directly as template for PCR. PCR was performed in a Perkin Elmer DNA Thermocycler model 2400 using 50 μl reactions containing: 15 mM Tris-HCl, pH 8.0, 50 mM KCI, 2.5 mM MgCI 2 , 200 μM dNTP, 0.5 μM of each primer, 2.5 U AmpliTaq Gold polymerase (Perkin-Elmer) and 5 μl cDNA. Conditions for PCR were: 10 min 95°C 1 cycle, 94°C 20 sec, 59°C 20 sec, 72°C 30 sec 50 cycles and 72°C 2 min 1 cycle. Primers used for PCR amplification were designed from the assumed primer binding site (PBS) in the RGH2 sequence (Hirose et al., 1993) and from an HERV-H sequence containing an open env reading frame (Lindeskog et al.,1999): (ii) 5'-CATGAAATTTGGTGCCTTGACTCGGAT- 3 ' (SEQ ID NO:42) (T m = 63.8°C) (iii) 5'-GAGATAGCTGGGGAGAGGTAGAGGATGA- 3 ' (SEQ ID NO:43) (T m = 61.3°C) PCR products were analysed by agarose gel electrophoresis. Relevant bands were cut out, cloned in the pCR ® 2.1 vector (Original TA Cloning ® kit, Invitrogen) and sequenced in both directions using the Thermo Sequenase fluorescent labelled primer cycle sequencing kit (Amersham Life Science). Sequence reactions were analysed on the ALFexpress DNA automatic sequencer (Pharmacia Biotech) and sequence analyses were performed using fasta and blast programs (Wisconsin Package, Version 9.1, Genetics Computer Group (GCG)). Using the above primer (i) for cDNA synthesis and the above primers (ii) and (iii) for PCR amplification, variations in band patterns were observed when comparing samples from MS patients, autoimmune patients and healthy controls. PCR fragments of 850 bp (+/- a few bp) were amplified in samples from 20 MS patients, 3 patients with autoimmune diseases (AU), 1 patient with leukaemia and 10 healthy controls. An additional fragment of 950 bp (+/- a few bp) was amplified in 14 of 37 MS patients, 3/3 AU patients, 1/15 autoimmune controls, 2/14 healthy controls and 1 leukaemia patient. Sequence analysis of the 850 bp fragments and the 950 bp fragments revealed that all were spliced env mRNA sequences containing the same splice donor site in the leader region downstream from the PBS sequence and a splice acceptor site in the part of pol encoding the integrase. In the 850 bp fragments the two sites were joined directly, whereas in the 950 bp fragments an additional region of 104 bp from the protease encoding region were inserted between the two sites, resulting in a second alternatively spliced env mRNA. In the present experiments, primers for PCR were derived from the RTVLH2 (PBS) and RGH2 (env) sequences (Mager and Freeman 1987, Hirose et al., 1993) , probably explaining why alternatively spliced env mRNA sequences were also seen in healthy samples. It is our experience that PCR primers derived from the RGH2 sequence generally detects a broader group of HERV-H sequence variants and do not discriminate between samples from MS patients, other autoimmune patients or healthy controls (results not shown). The 850 bp sequences shared 90-95 % homology with the RGH2 leader/integrase and env region and 93-97% homology with each other. Most of the sequences contain 100 bp of an open env reading frame (5'of the env PCR primer). The 950 bp sequences shared 87-95%) homology with the RGH2 sequence and 98-100%) homology with each other and with a previously published sequence isolated from a human T-cell leukaemia cell line (GenBank accession number u88896, Lindeskog and Blomberg, 1997). Two sequences with a similar splicing structure were isolated from two healthy blood donors (Genbank accession numbers u88897, U88898, Lindeskog and Blomberg, 1997). These sequences are 91 % and 93% homologous with the cell line sequence, u88896, and 83%) and 90% when only the protease regions are compared. An alignment of sequence variants containing the 104 bp protease encoding region are shown in Table 9.1. The sequences represent 10 clones (7 variants) isolated from 3 MS patients (MS1, MS2 and MS3) and 1 patient with diabetes mellitus (AU1). The sequence variants contain single base changes: substitutions and deletions, as compared to the clone MS1-1. This sequence was found in only one of the MS patients and was identical to the sequence isolated from a T-cell leukaemia cell line (u88896, Lindeskog and Blomberg, 1997). In Table 9.2, sequences of the inserted protease region is compared to the U88896 sequence (see above) with deviations highlighted. The material is the same as in Table 9.1 , i.e. 10 independent clonings of the 950 bp fragment from 4 individuals. The region analyzed in Table 9.2 starts at the splice donor site (position 1) and ends at the splice acceptor site (position 104) in the u88896 sequence (reference sequence). This region is designated PSR in the following. The single PSR sequence cloned from patient MS1 is identical to the reference sequence, while the single PSR sequence from patient MS2 shows two substitutions at positions 82 and 97. These two substitutions are shared by three individuals (MS2, MS3, and AU1). This may indicate that positions 82 and 97 are markers of RGH alleles at the same genetic locus in the human genome or markers of closely related RGH genes at different genetic loci. Similarly, the single-base deletion at PSR position 53 which is shared by two individuals (MS2 and AU1) may represent a further such marker. The single-base changes at position 13 in one PSR-region from patient MS2 and at position 75 in two PSR-regions from AU1 may represent additional genetic markers as described above or may be attributed to errors introduced into proviral DNA during reverse transcription. Table 9.1. Alignment of seguence variants from the protease encoding region in the alternatively spliced env mRNA from three MS patients and one patient with an autoimmune disease: diabetes mellitus. The sequences represent 10 clones: MS1-1 , MS2-1, MS2-2 (=AU1-4), MS2-3, MS2-4 (=MS3-1 , AU1-3), AU1-1 , AU1-2. The splice sites are shown with arrows. Single bp deletions or substitutions relative to MS1-1 are indicated by bold letters. Lower case = unsure base, ~ = not determined, K=G/T, Y=C/T, N=A/C/G/T. 1 50 MS2-1 CACCTATGAC CTCAGGTCCT CAGA.CGANC CAGCCCAAGA AACATCTCAC MS2-4 CACCTATGAC CTCAGGTCCT CAGA.CG.AC CAGCCCAAGA AACATCTCAC MS2-2 -TCAGGTCCT CAGA.CG.Ac CAGCCcAAGA AACATCTCAC AUl-1 CACCTATGAC CTCAGGTCCT CAGA.CG.AC CAGCCCAAGA AACATCTCAC MS1-1 ~ MS2-3 CACCTATGAC CTCAGGTCCT CAGA.CcGAC CAGCCCAAGA AACATCTCAC AU1-2 CACCTATGAC CTCAGGTCCT CAGACcGAAC CAGCCCAAGA AACATCTCAC 51 ► 100 MS2-1 CAATTTCAAA TCCGATCTTC TCGGCCTAGC GGCTGAAGAC TGACGCTGCC MS2-4 CAATTTCAAA TCCGATCTTC TCGGCTTAGC GGCTGAAGAC TGACGCTGCC MS2-2 CAATTTCAAA TCCGATCTTC TCGGCTTAGC GGCTGAAGAC TGACGCTGCC AUl-1 CAATTTCAAA TCCGATCTTC TCGGCTTAGC GGCTGAAGAC TGACGCTGCC S1-1 -CGGCTTAGC GGCTGAAGAC TGACGCTGCC MS2-3 CAATTTCAAA TCCGATCTTC TCGGCTTAGC GGCTGAAGAC TGACGCTGCC AU1-2 CAATTTCAAA TCCGATCTTC TCGGCTTAGC GGCTGAAGAC TGACGCTGCC 101 150 S2-1 CGATCGCCTC GGAAGCCCCC TAGACCATCA CGGATGCCGA GCTTTGGGTA MS2-4 CGATCGCCTC GGAAGCCCCC TAGACCATCA CGGATGCCGA GCTTTGGGTA MS2-2 CGATCGCCTC GGAAG.CCCC TAGACCATCA CGGATGCCGA . GCTTTGGGTA AUl-1 CGATCGCCTC GGAAG.CCCC TAGACCATCA CGGATGCTGA GCTTTGGGTA MS1-1 CGATCGCCTC GGAAGCCCCC TAGACCATCA CGGATGCCGA GCTTCGGGTA MS2-3 CGATCGCCTC GGAAG.CCCC TAGACCATCA CGGATGCCGA GCTTTGGGTA AU1-2 CGATCGCCTC GGAAGCCCCC TAGACCATCA CGGATGCTGA GCTtKGGgTA 151 < 200 MS2-1 ACTCTCACAG TGGAAGATCC CCAGCCATAT GAAGACAACC TAGCTGGACG MS2-4 ACTCTCACAG TGGAAGATCC CCAGCCATAT GAAGACAACC TAGCTGGACG MS2-2 ACTCTCACAG TGGAAGATCC CCAGCCATAT GAAGACAACC TAACTGGACG AUl-1 ACTCTCACAG TGGAAGATCC CCAGCCATAT GAAGACAACC TAGCTGGACG MS1-1 ACTCTCACAA TGGAAGATCC CCAGCCATAT GAAGACAACC TAGCTGGACG MS2-3 ACTCTCACAG TGGAAGAT.C CCAGCCATAT GAAGACAACC TAGCTGGACG AU1-2 AYTCTCACAG TGGAAGAT.C CCAGCCATAT GAAGACAACC TAGCTGGACG (MS2-1: SEQ ID NO:44; MS2-4: SEQ ID NO:45; MS2-2: SEQ ID NO:46; AU1-1: SEQ ID NO:47; MS1-1 : SEQ ID NO:48; MS2-3: SEQ ID NO:49; AU1-2: SEQ ID NO:50) Table 9.2. Alignment of 7 seguence variants (see Table 9.1) from the protease region in the alternatively spliced env mRNA from three MS patients, one patient with diabetes mellitus and the seguence isolated from a human T-cell leukemia cell line, u88896 (Blomberg and Lindeskog, 1997). Only variant positions are shown. X = not seguenced. 10 20 30 40 50 60 70 80 90 100 uδ8896 GATCTTCTCGGCTTAGCGGCTGAAGACTGACGCTGCCCGATCGCCTCGGAAGCCCCCTAGACCATCACGGATGCCGAGCTTCGGGTAACTCTCACAATGGAAGA MS1-1 XXXXXXX MS2-1 T G MS2-2 T G MS2-3 T G MS3-1 AUl-1 T T G AU1-2 T T G AU1-3 T G AU1-4 T G REFERENCES Anderssen S, Sjøttem E, Svineng G, Johansen T: Comparative analysis of LTRs of the ERV- H family of primate-specific retrovirus-like elements isolated from marmoset, african green monkey and man. Virology, 1997, 234:14-30), Bengtsson A, Blomberg J, Nived O, Pipkorn R, Toth L, Stuhrfeldt G. Selective antibody reactivity with peptides from human endogenous retroviruses and nonviral poly(amino acids) in patients with systemic lupus erythematosus. Arthritis Rheum, 1996, 39:1654-1663. Bhat NK, Adachi Y, Samuel KP, Derse, D. HTLV-1 gene expression by defective proviruses in an infected T-cell line. Virology, 1993, 196:15-24 Blond JL, Beseme F, Duret L, Bouton O, Bedin F, Perron H, Mandrand B, Mallet F. Molecular characterization and placental expression of HERV-W, a new human endogenous retrovirus family. J Virol, 1999, 73:1175-1185. Boiler K, Janssen O, Schuldes H, Tonjes RR, Kurth R. Characterization of the antibody response specific for the human endogenous retrovirus HTDV/HERV-K. J Virol, 1997, 71:4581-4588. Boiler K, Kόnig H, Sauter M et al. Evidence that HERV-K is the endogenous retrovirus sequence that codes for the human teratocarcinoma derived retrovirus HTDV. Virology, 1993, 196:349-354. Challoner PB, Smith KT, Parker JD et al. Plaque associated expression of human herpesvirus 6 in multiple sclerosis. Proc Natl Acad Sci, 1996, 92:7440-7444. Christensen T, Dissing Sørensen P, Riemann H, Hansen HJ, Møller-Larsen A. Expression of the Endogenous Retrovirus RGH in Particle Form in Multiple Sclerosis. The Lancet, 1998, 352:1033. Christensen T, Jensen AW, Munch M et al. Characterization of retrovirus from multiple sclerosis patients. Acta Neurol Scand 1997, Suppl 169:49-58. Christensen T, Møller-Larsen A, Haahr S. A retroviral implication in multiple sclerosis? Trends Microbiol, 1994, 9:332-336. Christensen T, Tόnjes RR, zur Megede J, Boiler K, Møller-Larsen A. RT Activity and Particle Production in B-lymphoblastoid Cell Lines from lymphocytes from multiple sclerosis patients. AIDS Res Hum Retroviruses, 1999, 15:285-291. Christensen T, Dissing Sørensen P, Riemann H, Hansen HJ, Munch M, Haahr S, Møller- Larsen A. Molecular characterization of HERV-H variants associated with multiple sclerosis. Acta Neurol Scand, 2000, 101:229-238. Comings OE, Kovacs BW, Avelino E, Harris DC: Mechanisms of chromosome banding. V. Quinacrine banding Chromosoma, 1975, 50:111-114. Conrad B, Weissmahr RN, Boni J, Arcari R, Schϋpbach J, Mach B. A human endogenous retroviral superantigen as candidate autoimmune gene in type 1 diabetes. Cell, 1997, 90:303-313. Dalgliesh AG. Viruses and multiple sclerosis. Acta Neurol Scand 1997, Suppl 169: 8-15. deRossi A, Aldovini A, Franchini G, Mann D, Gallo RC, Wong-Staal F. Clonal selection of T lymphocytes infected by cell-free human T cell leukemia/lymphotropic virus type 1. Parameters of virus integration and expression. Virology, 1985, 143: 640-645. Fan N, Gavalchin J, Paul B, Wells KH, Lane MJ, Poiesz, BJ. Infection of peripheral blood mononuclear cells and cell lines by cell-free human T-cell lymphoma/leukemia virus type I. J Clin Microbiol, 1992, 30:905-910. Feigner JH, Kumar R, Sridhar CN, Wheeler C, Tsai YJ, Border R, Ramsey P.Martin M, Feigner PL. Enhanced gene delivery and mechanism studies with a novel series of cationic lipid formulations. J Biol Chem, 1994, 269:2550-2561. Garson JA, Tuke PW, Giraud P, Paranhos-Baccala G, Perron H. Detection of virion-associated MSRV-RNA in serum of patients with multiple sclerosis. The Lancet, 1998, 351:33. Goodchild NL, Wilkinson DA, Mager DL. Recent evolutionary expansion of a subfamily of RTVL-H human endogenous retrovirus-like elements. Virology, 1993, 196:778-788. Griffiths DJ, Venables PJW, Weiss RA, Boyd MT. A novel exogenous retrovirus sequence identified in humans. J Virol, 1997, 71:2866-2872. Haahr S, Koch-Henrichsen N, Møller-Larsen A, Eriksen LS, Andersen HMK. Increased risk of multiple sclerosis after late Epstein-Barr infection: a historical prospective study. Multiple Sclerosis, 1995, 1:73-77. Haahr S, Munch M, Christensen T, Møller-Larsen A, Hvas J. Cluster of multiple sclerosis patients from Danish community. The Lancet, 1997, 341:923. Haahr S, Sommerlund M, Møller-Larsen A, Nielsen R, Hansen HJ. Just another dubious virus in cells from a patient with multiple sclerosis? The Lancet, 1991 : i:863. Hirose Y, Takamatsu M, Harada F. Presence of env genes in members of the RTVL-H family of human endogenous retrovirus-like elements. Virology, 1993, 192: 52-61. Hohenadl C, Leib-Mόsch C, Hehlmann R, Erfle V. Biological significance of human endogenous retroviral sequences. J Acquired Immune Defic Syndr Hum Retrovirol, 1996, Suppl 1 :5268-5273. Johansen J, Holm T, Bjorklid E. Members of the RTVL-H family are expressed in human placenta. Gene, 1989, 79:259-267. Kelleher CA, Wilkinson DA, Freeman JD, Mager DL, Gelfand EW. Expression of novel transposon-containing mRNAs in human T cells. J Gen Virol, 1996, 77:1101- 1109. Klenerman P, Hengartner H, Zinkernagel RM. A non-retroviral RNA virus persists in DNA form. Nature, 1997, 390:298-301. Komurian-Pradel F, Paranhos-Baccala G, Bedin F et al. Molecular cloning and characterization of MSRV-related sequences associated with retrovirus-like particles. Virology, 1999, 260:1-9. Krieg AM, Gourley MF, Perl A. Endogenous retroviruses: potential etiologic agents in autoimmunity. FASEB J, 1992, 6:2537-2544. Lindeskog M, Blomberg, J. Spliced human endogenous retroviral HERV-H env transcripts in T-cell leukemia cell lines and normal leukocytes: alternative splicing pattern of HERV-H transcripts. J. Gen. Virol., 1997, 78:2575-2585. Lindeskog M, Mager DL, Blomberg J. Isolation of a human endogenous retroviral HERV-H element with an open env reding frame. Virology, 1999, 258:441-450. Lindeskog M, Medstrand P and Blomberg J. Sequence variation of human endogenous retrovirus ERV9-related elements in an env region corresponding to an immunosuppressive peptide: transcription in normal and neoplastic cells. J. Virol., 1993, 67:1122-1126. Linial ML, Miller AD. Retroviral RNA packaging: sequence requirements and implications. Curr Top Microbiol Immunol, 1990, 157:125-152. Lower R, Lower J, Tondera-Koch C, Kurth R. A general method for the identification of transcribed retrovirus sequences (R-U5 PCR) reveals the expression of the human endogenous retrovirus loci HERV-H and HERV K in teratocarcinoma cells. Virology, 1993, 192:501-510. Lugert R, Kόnig H, Kurth R, Tonjes RR. Specific suppression of false positive signals in the Product Enhanced Reverse Transcriptase assay. Biotechniques, 1996, 20:210-217. Mager DL and Freeman, J D. Human endogenous retroviruslike genome with type C pol sequences and gag sequences related to human T-cell lymphotrophic viruses. J. Virol., 1987, 61:4060-4066. Markham PD, Ruscetti F, Salahuddin SZ, Gallagher RE, Gallo RC. Enhanced induction of growth of B lymphoblasts from fresh human blood by primate type-C retroviruses (Gibbon Ape Leukemia Virus and Simian Sarcoma Virus) Int J Cancer, 1979, 23:148-156. Martyn C. The epidemiology of multiple sclerosis. In: Matthews WB, ed. McAlpines's Multiple Sclerosis. Churchill Livingstone: Edinburgh, 1991 : 3-40. Medstrand P, Lindeskog M, Blomberg J. Expression of human endogenous retroviral sequences in peripheral blood mononuclear cells of healthy individuals. J Gen Virol, 1992, 73:2463-2466. Morozov VA, Lagaye S, llyinski PO, Cherepovsky DN, llyin K. Analyses of retroviral proteins by two-step DNA, zinc binding and modified South-Western blotting. Intervirology, 1992, 34:117-123. Munch M, Møller-Larsen A, Christensen T, Morling N, Hansen HJ, Haahr S. B-lymphoblastoid cell lines established from multiple sclerosis patients and a healthy control producing a putative new human retrovirus and Epstein-Barr virus. Multiple Sclerosis, 1995, 1:78-81. Møller-Larsen A, Christensen T. Isolation of a retrovirus from multiple sclerosis patients in self-generated lodixanol Gradients. J Virol Methods, 1998, 73:151-161. Nakagawa K, Brusic V, McColl G, Harrison LC. Direct evidence for the expression of multiple endogenous retroviruses in the synovial compartment in rheumatoid arthritis. Arthritis Rheum, 1997, 40:627-638. Nielsen L, Møller-Larsen A, Munch M, Vestergaard BF. Human Herpesvirus 6 immunoglobulin G antibodies in patients with multiple sclerosis. Acta Neurol Scand, Suppl 169:76-78. Perron H, Garson JA, Bedin F et al. Molecular identification of a novel retrovirus repeatedly isolated from patients with multiple sclerosis. Proc Natl Acad Sci, 1997, 94:7583-7588. Porter CD, Lukacs KV, Box G, Takeuchi Y, Collins MKL. Cationic liposomes enhance the rate of transduction by a recombinant retroviral vector in vitro and in vivo. J Virol, 1998, 72:4832-4840. Pyra H, Bόni J, Schϋpbach J. Ultrasensitive retrovirus detection by a reverse transcriptase assay based on product enhancement. Proc Natl Acad Sci, 1994, 91: 1544-1548. Sanders VJ, Felisan S, Waddell A, Tourtellotte WW. Detection of herpesviridae in postmortem multiple sclerosis brain tissue and controls by polymerase chain reaction. J Neurovirol, 1996, 2:249. Silver J, Maudru T, Fujita K, Repaske R. An RT-PCR assay for the enzyme activity of reverse transcriptase capable of detecting single virions. Nucl Acids Res, 1993, 21:3593-3594. Sommerlund M, Pallesen G, Møller-Larsen A, Hansen HJ, Haahr S. Retrovirus-like particles in an Epstein-Barr virus-producing cell line derived from a patient with chronic progressive myelopathy. Acta Neurol Scand, 1993, 87:71-76. Sun R, Grogan E, Shedd D et al. Transmissible retrovirus in Epstein-Barr virus- producer B95-8 cells. Virology, 1995, 209:374-383. Takeuchi Y, Cosset F-L, Lachmann PJ, Okada H, Weiss, RA, Collins MKL. Type C retrovirus inactivation by human complement is determined by both the viral genome and the producer cell. J Virol, 1994, 68:8001-8007. Todaro GJ. Evolution and modes of transmission of RNA tumor viruses. Am J Pathol, 1975, 81:590-605.) Tόnjes RR, Lower R, Boiler K et al. HERV-K: The biologically most active human endogenous retrovirus family. J Acq Imm Def Syndr Hum Retrovirol, 1996, 13: S261-S267. Wilkinson D A, Freeman J D, Goodchild N L, Kelleher C A and Mager D L. Autonomous expression of RTVL-H endogenous retroviruslike elements in human cells. J. Virol., 1990, 64:2157-2167. Wilkinson DA, Goodchild NL, Saxton TM, Wood S, Mager DL. Evidence for a functional subclass of the RTVL-H family of human endogenous retrovirus-like sequences. J Virol, 1993, 67:2981-2989. Williams DA. Retroviral-fibronectin interactions in transduction of mammalian cells. Ann Ann NY Acad Sci, 1999, 872: 109-113. Yamano S, Renard JN, Mizuno F et al. Retrovirus in salivary glands from patients with Sjδgren's syndrome. J Clin Pathol, 1997, 50:223-229.

Claims: CLAIMS 1. A human endogenous retrovirus belonging to the RTVL-H/HERV-H family in isolated form or in retroviral particle form that is capable of infecting a mononuclear cell and of replicating therein. 2. A retrovirus according to claim 1 which is obtainable by ultracentrifugation of a cell culture supernatant or cell-free plasma sample in Optiprep™ density gradient medium followed by recovery of the fraction containing retroviral particles . 3. A retrovirus according to claim 1 or claim 2 that encodes a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease (pol) region of said RGH retrovirus. 4. A retrovirus according to claim 3 wherein the spliced mRNA sequence comprises a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. 5. A retrovirus according to any of claims 1-4 that is isolatable from a human subject selected from the group consisting of a multiple sclerosis (MS) patient, a patient suffering from an autoimmune disease, a patient suffering from diabetes and a patient suffering from a malignancy. 6. A retrovirus according to claim 5 that is isolatable from a cell culture derived from peripheral blood of said human subject. 7. A retrovirus according to claim 6 that is isolatable from a cell culture derived from peripheral blood of an MS patient, said cell culture comprising at least 2% CD3+ T-cells. 8. A retrovirus according to any of claims 1-7 that is capable of infecting a blood cell derived from a human subject not suffering from MS, an autoimmune disease, diabetes or a malignancy, and of replicating therein. 9. A retrovirus according to claim 1-8 that is capable of infecting a non-blood human cell. 10. A retrovirus according to any of claims 1-9 that is capable of infecting a non-human cell. 5 11. A retrovirus according to claim 10 that is capable of infecting a cell derived from an animal selected from the group consisting of a bat, a rabbit and a rodent. 12. A retrovirus according to any of claims 1-11 which is an RGH virus. 10 13. A retrovirus according to any of claims 1-12 that comprises a nucleic acid sequence that is at least 80% identical to the RGH-2 virus sequence published by Hirose et al., Virology, 1993, 192:52-61. 14. A method of detecting intra-species infectivity (transmissibility) of a retrovirus 15 according to any of claims 1-13, the method comprising the steps of isolating the retrovirus from a patient as defined in claim 5, contacting said isolated virus with a culture of mononuclear cells derived from a human subject not suffering from MS, an autoimmune disease, diabetes or a malignancy, and detecting infection of said cells with the retrovirus. 20 15. A method according to claim 14 wherein the infection of the culture of mononuclear cells is detected by the appearance of RT activity in the infected culture or by an assay for rescue of the infecting retrovirus in indicator cells as described hereinbefore. 25 16. A method according to claim 14 or 15 wherein the infection of the culture of mononuclear cells is detected by the appearance in cells of said culture of a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease (pol) region of said RGH retrovirus, including a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID 30 NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. 17. A method of detecting inter-species infectivity (transmissibility) of a retrovirus according to any of claims 1-13, the method comprising the steps of isolating the 35 retrovirus from a human subject as defined in claim 5, contacting said isolated viruses with a culture of mononuclear cells derived from a non-human individual, and detecting infection of said cells with the retrovirus. 18. A method according to claim 17 wherein the infection of the culture of mononuclear 5 cells is detected by the appearance of RT activity in the infected culture or by an assay for rescue of the infecting retrovirus in indicator cells as described hereinbefore. 19. A method according to claim 17 or 18 wherein the infection of the culture of mononuclear cells is detected by the appearance in cells of said culture of a spliced 10 HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease (pol) region of said RGH retrovirus, including a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. 15 20. A method according to any of claims 14-19 wherein the culture of mononuclear cells being contacted is pre-stimulated with a mononuclear cell stimulating compound including PHA. 20 21. A method according to any of claims 14-20 wherein the mononuclear cells are blood cells. 22. A culture of mononuclear cells derived from a human subject selected from the group consisting of a multiple sclerosis (MS) patient, a patient suffering from an autoimmune 25 disease, a patient suffering from diabetes and a patient suffering from a malignancy, said cells are capable of expressing a spliced HERV-H RGH retrovirus env mRNA sequence comprising a region from the protease encoding (pol) region of said retrovirus. 23. A culture according to claim 22 wherein the spliced mRNA sequence comprises a 30 region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. 24. A culture according to claim 22 or 23 which comprises at least 2% CD3+ T-cells. 35 25. A method of diagnosing a disease selected from the group consisting of multiple sclerosis, an autoimmune disease, diabetes and a malignancy, the method comprising isolating mononuclear blood cells from a patient suspected of suffering from any of said diseases and detecting in said cells a mRNA sequence as defined in claims 22 or 23 or a 5 polypeptide transcribed from said mRNA sequence. 26. A method of diagnosing a disease associated with the retrovirus according to any of claims 1-13, the method comprising the steps of isolating the retrovirus from a human subject as defined in claim 5 and testing its infectivity according to the method of any of 10 claims 14-20. 27. A method according to claim 26 wherein the disease being diagnosed is multiple sclerosis. 15 28. A method of treating a patient suffering from a disease, the clinical manifestations of which are associated with the presence of the retrovirus according to any of claims 1-13, the method comprising administering to the patient an effective amount of a pharmaceutical agent that is capable of at least partially preventing the infection of cells in the patient with the retrovirus and/or the migration of the retrovirus to cells in the patient 20 that can be infected by the retrovirus. 29. A method of treating a patient suffering from a disease, the clinical manifestations of which are associated with cells transformed (immortalised) by infection with the retrovirus according to any of claims 1-13, the method comprising administering to the patient an 5 effective amount of a pharmaceutical agent that is capable of at least partially eliminating such transformed (immortalised) cells. 30. A method according to claim 28 or 29 wherein the disease is a disease selected from the group consisting of a demyelinating disease including multiple sclerosis, an 30 autoimmune disease, diabetes and a malignancy. 31. An antiviral agent for use as a medicament in the control of a disease, the clinical manifestations of which are associated with the presence of the retrovirus according to any of claims 1-13. 5 32. Use of an antiviral agent in the manufacturing of a medicament for controlling a disease associated with the retrovirus according to any of claims 1-13. 33. Use according to claim 32 wherein the disease is selected from the group consisting 5 of a demyelinating disease, a malignancy, diabetes and an autoimmune disease. 34. Use according to claims 32 or 33 wherein the antiviral agent is an agent that selectively inhibits or eliminates the retrovirus according to any of claims 1-13. 10 35. Use according to claim 34 wherein the agent is selected from the group consisting of an antibody, an anti-sense nucleic acid and a ribozyme. 36. A method of controlling a disease, the clinical manifestations of which are associated with immunological responses to the retrovirus according to any of claims 1-13, the 15 method comprising administering to the patient an effective amount of a pharmaceutically active compound that is capable of at least partially inhibiting said immunological responses. 37. A method according to claim 36 wherein the pharmaceutically active compound is 20 directed against an immunological response elicited specifically by the retrovirus according to claim 3 or claim 4. 38. A method according to claim 37 wherein the pharmaceutically active compound is directed against inhibiting the biological activity of activated T-cells including CD3+, CD4- 25 and CD8- T-cells or against eliminating such T-cells. 39. A pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially inhibiting in a human subject as defined in claim 5 an immunological response to the retrovirus according to any of claims 1-13. 0 40. A composition according to claim 39 wherein the pharmaceutically active compound is directed against an immunological response elicited specifically by the retrovirus according to any of claims 1-13. 41. A composition according to claim 39 or 40 wherein the pharmaceutically active compound is a compound directed against inhibiting the biological activity of activated T- cells including CD3+, CD4- and CD8- T-cells or against eliminating such T-cells. 5 42. A pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially preventing the infection of cells in a patient with the retrovirus according to any of claims 1-13, and/or the migration of the retrovirus to cells in the patient that can be infected by the retrovirus. 10 43. A pharmaceutical composition comprising a pharmaceutically active compound that is capable of at least partially eliminating in a patient cells transformed (immortalised) by infection with the retrovirus according to any of claims 1-13. 44. Use of an allelically occurring spliced HERV-H RGH retrovirus env mRNA sequence 15 comprising a region from the protease (pol) region of said RGH retrovirus as a marker for the occurrence or the state of a disease selected from the group consisting of a demyelinating disease including multiple sclerosis, an autoimmune disease, diabetes and a malignancy. 20 45. Use according to claim 44 wherein the mRNA sequence comprises a region from the protease encoding region that is selected from the group consisting of SEQ ID NO:44; SEQ ID NO:45; SEQ ID NO:46; SEQ ID NO:47; SEQ ID NO:48; SEQ ID NO:49; and SEQ ID NO:50 as defined herein, and variants and subsequences hereof. 25 46. A method for identifying compounds capable of inhibiting the production of a retrovirus according to any of claims 1-13 from a cell, the method comprising exposing cells capable of producing a retrovirus according to any of claims 1-13 to a candidate compound and comparing the amount of virus produced by the cells in the presence of the compound with the amount of virus produced by the cells in the absence of the compound, and 30 thereby identifying compounds capable of inhbiting the production of virus from said cells. 47. A method for identifying compounds capable of preventing infection of a target cell with a retrovirus according to any of claims 1-13, which method comprises exposing target cells susceptible to infection with a retrovirus according to any of claims 1-13 to a sample 35 containing the said virus in the presence of a candidate compound, determining the extent of infection of the target cells in the presence of the compound and thereby identifying compounds capable of preventing infection of the target cell with the virus. SEQUENCE LISTING <110> MS RESEARCH A/S <120> AN INFECTIVE ENDOGENOUS RETROVIRUS AND ITS ASSOCIATION WITH DEMYELINATING DISEASES AND OTHER DISEASES <130> SJA/56402/001 <140> <141> <160> 50 <170> Patentln Ver. 2.0 <210> 1 <211> 284 <212> DNA <213> Retrovirus RGH-2 <400> 1 cccaatgcaa ctcatcccaa atcttccttc tttccctccc acctgccctc tgagtcccaa 60 ccccaagcat tgctgagtct ttctaatctt ccttttctac agacccatct gacctctccc 120 ctcctcacca ggctgagcta ggtcccaatt cttcctcagc ctccactcct ccaccctata 180 atccttttat cacctcccct cctcacactc agtctggctt acagtttcat tccgtgacta 240 gccctccccc acctgcccag caatttcctc ttaaaaagtt ggct 284 <210> 2 <211> 173 <212> DNA <213> Retrovirus RGH-2 <400> 2 ccaaacatta aataaaactc caaaaattaa attctggccc tcaaacccca caacaggatt 60 taattaacct caccttcaag gtgtacaata atagaaaaaa gttgcaattc cttgcctcca 120 ctgtgagaca aaccccagac acatctccag cacacaagaa cttcgaaatg ctt 173 <210> 3 <211> 282 <212> DNA <213> Retrovirus <400> 3 cccaatgcaa ctaatcccaa atcttcctcc tttccctccc gcctgtcccc tcagtaccaa 60 ccccaagcgt cgctgagtct ttctaatctt ccttttctac agacccatct gacctctccc 120 ctcctcacca ggtcgagcta ggtcccaatt cttcttcagc ctccactcct ccaccctata 180 atccttttat cacctcccct cctcacacct ggtccagctt acagtttcgt tctgcgacta 240 gccttccccc acctgcccag caatttcctc ttaaaaaggt gg 282 <210> 4 <211> 296 <212> DNA <213> Retrovirus <400> 4 tccagtgcaa ctcatcccaa atgttccttc tttccctccc atctgtcccc tcagtaccaa 60 ccccaagcgt cactgagtct ttctaatctt ccttttgtac agacccatct gacctctccc 120 ttcctcccca ggtcgtcctc gccaggccga gctaggtccc aattcttcct cagcctccat 180 tcctccacgc tgtaatcttt ttatcacctc ccctcctcac acctggtccg gcttacagtt 240 tcgttctgtg actagccctc ccccacctgc ccagcaattt actcttaaaa aggcgg 296 <210> 5 <211> 168 <212> DNA <213> Retrovirus <400> 5 cccgacatta aataaagctc caaaaattag attccagccc ggaaacccca caacaggact 60 taacctcacc ttcaaggtgt acaataatag agaggagtct caattcttgc ctctgctgtg 120 agagaaaccc cagccacatc tccagcacac aagaacttca aaatgcct 168 <210> 6 <211> 201 <212> DNA -<213> Retrovirus <400> 6 ccaaacatta aataaaactc caaaaattaa attccggccc tcaaacccca caacaaggct 60 taattaacct caccttccaa ggtgttcaat aacagagtag aggcaaccaa gtagcaatgt 120 atttctaagt tgcaattcct tacctccact gtaagacaaa ccccagccac atctccagca 180 cacaagaact ccaaatgccc g 201 <210> 7 <211> 439 <212> DNA <213> Retrovirus RGH-1 <400> 7 ccagaataaa gctgtgtcca tcggacagcc agcctaatcc ctcctcttcc tcctagaagt 60 cacaagtact ctcccccact taagtactct cccccacttc ccttaaactc actcgtattt 120 ctgaagaaca gtaataaccc ttatgagcct aatacatccc ttcattctat taggtctgtt 180 cgtccttacc ctactttttg caacagggct ttacgaagtc acccccacca cttaggccga 240 gccccaaaaa ctagtcatcc ctactatctt ctgtccggtc atactcctat tctccattct 300 caactactta taaatgccct actcttgttt acactgccag tttacactgt ttcttcaage 360 cattacagct gatatctctt ggtgctatcc ccaaaccacc actcttaact ccctcttaga 420 gtggatagat gatctttgc 439 <210> 8 <211> 422 <212> DNA <213> Retrovirus RGH- <400> 8 ccagaataaa gctgtgtcca ttggacagcc agcctaatcc ctcctcttcc tcctggaagt 60 cgcaattact ctcccctact tcccttaaac tcactcgtat ttctgaagaa cagtaataac 120 ccttatgagc ctaatacatc ccttcattct attaggtctg tttgtcctta ccctactttt 180 tgcaacaggg ctttatgaac tcacccccac cacttaggct gagcccaaaa aatcttgtca 240 tccctactat tttctgtcca gtcatactcc tattctctgc tctcaactac ttataaatgc 300 cgtactcttg tttacactgc cggtttacac tgtttcttca agccatcaca gctgatatct 360 cttggtgcta tccccaaacc gccactctta attccctctt agagtgggta gatgatcttt 420 gc 422 <210> 9 <211> 422 <212> DNA <213> Retrovirus <400> 9 ccagaataaa gctgtgtcca tcggacagcc agcctaatcc ctcctcttcc tcctggaagt 60 cacaagtatt ctcccctact tcccttaaac tcactcgtat ttctgaagaa cagtaatagc 120 ccttatgagc ctaatacatc ccttcattct attagatctg ttcgtcctta ccctactttt 180 tgcaacaggg ctttacgaag tcaccctnac cacttggcct gatccccaaa aaactagtca 240 accctactat cttctgtcta gtcatactcc tattctccat tctcaantac ttataaatgc 300 cctactcttg tttccactgc tggtttanac tgtttcttca agccatcaca gctgatatct 360 cttggtgcta tcccgcaact gccactctta actccctctt agagtggata gatgatcttt 420 gc 422 <210> 10 <211> 421 <212> DNA <213> Retrovirus <400> 10 ccagaataaa gctctgtcca tcagacagcc agcctaatcc ctcctcttcc tcctggaagt 60 cgcaagtact ctcccctact tcccttaaac tcactcatat ttctgaagaa cagtaataac 120 ccttatgagc ctaatacatc ccttcattct gttaggtcta ttcgtcctta ccctactttt 180 tgcaacgggg ctttatgacg tcacccccac cacttaggct gagccccaaa aaacttgtca 240 tccctactat tttctgtcta gtcatactcc tattctctgc tcttaactac ttataaatgc 300 cctactcttg tttacactgc cggtttacac tgtttcttca agccatcaca gctgatatct 360 cttggtgcta tccccaaacc actactctta ttccctctta gagtgggtag atgatctttg 420 421 <210> 11 <211> 48 <212> PRT <213> Retrovirus HTLV-1 <400> 11 Pro Lys Lys Pro Pro Pro Asn Gin Pro Cys P e Arg Cys Gly Lys Ala 1 5 10 15 Gly His Trp Ser Arg Asp Cys Thr Gin Pro Arg Pro Pro Pro Gly Pro 20 25 30 Cys Pro Leu Cys Gin Asp Pro Thr His Trp Lys Arg Asp Cys Pro Arg 35 40 45 <210> 12 <211> 47 <212> PRT <213> Retrovirus RTVL-H <220> <221> SITE <222> (23) <223> Xaa represents stop codon <400> 12 Pro Pro Glu Pro Pro Pro Pro Gly Ala Cys Tyr Lys Cys Gin Lys Ser 1 5 10 15 Gly His Trp Ala Lys Glu Xaa Pro Gin Pro Arg lie Pro Pro Lys Pro 20 25 30 Cys Pro lie Cys Val Gly Pro His Trp Lys Ser Asp Cys Pro Thr 35 40 45 <210> 13 <211> 47 <212> PRT <213> Retrovirus RGH-2 <220> <221> SITE <222> (41) <223> Xaa represents stop codon <400> 13 Pro Pro Glu Pro Ser Pro Pro Gly Ala Cys Tyr Lys Cys Gin Lys Ser 1 ' 5 10 15 Gly His Trp Ala Lys Glu Cys Pro Gin Thr Arg lie Pro Pro Lys Leu 20 25 30 Tyr Pro lie Ser Val Gly Pro His Xaa Lys Ser Asp Cys Ser Thr 35 40 45 <210> 14 <211> 47 <212> PRT <213> Retrovirus <400> 14 Pro Ser Asp Pro Pro Pro Pro Ala Ser Cys Phe Lys Cys Leu Lys Ser 1 5 10 15 Gly His Trp Thr Lys Glu Cys Pro Gin Pro Gly lie Pro Pro Lys Asp 20 25 30 Ser Pro lie Cys Ala Gly Pro His Trp Lys Lys Asp Cys Pro Pro 35 40 45 <210> 15 <211> 47 <212> PRT <213> Retrovirus <220> <221> SITE <222> (41) <223> Xaa represents stop codon <400> 15 Pro Pro Asp Pro Pro Pro Pro Gly Ala Cys Tyr Thr Cys Gin Lys Ser 1 5 10 15 'Gly His Trp Ala Lys Glu Cys Pro Gin Arg Gly lie Pro Pro Lys Pro 20 25 30 Arg Pro lie Cys Val Gly Pro His Xaa Lys Ser Asp Cys Ser Thr 35 " 40 45 <210> 16 <211> 47 <212> PRT <213> Retrovirus <220> <221> SITE <222> (25) <223> Xaa represents stop codon <220> <221> SITE <222> (41) <223> Xaa represents stop codon <400> 16 Pro Pro Asp Pro Pro Pro Pro Gly Ala Cys Tyr Thr Cys Trp Lys Ser 1 5 10 15 Gly His Trp Ala Lys Glu Cys Pro Xaa Pro Gly lie Pro Pro Lys Pro 20 25 30 Arg Pro lie Cys Val Gly Pro His Xaa Lys Ser Asp Cys Ser Thr 35 40 45 <210> 17 <211> 28 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 17 cttttattac ccaatctgct cccgayat 28 <210> 18 <211> 28 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 18 ttagtggtgg acagtctctt ttccartg 28 <210> 19 <211> 32 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 19 cgtttacata tcactccctt cctagtctct gt 32 <210> 20 <211> 31 <212> DNA <213> Artificial Sequence <220> <223> .Description of Artificial Sequence: Primer <400> 20 gcattaacct tgactatgtc tttagctcca g 31 <210> 21 <211> 28 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 21 attttattac ccaatctgct ccaaacat 28 <210> 22 <211> 26 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 22 aggtgagttg aacagtctga ttttta 26 <210> 23 <211> 25 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 23 gatcctcccc actgggttca ccatt 25 <210> 24 <211> 24 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 24 ggaagtattg gagggtgccc tgcc 24 <210> 25 <211> 24 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 25 cataggtcaa acctcctagg aatg 24 <210> 26 <211> 22 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 26 tcctgctcaa cttcctgtcg ag 22 <210> 27 <211> 21 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 27 ttaatgtctt tagcgagacg c 21 <210> 28 <211> 21 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 28 atggctatcg ctgtaggtag c 21 <210> 29 <211> 32 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 29 cgtttacata tcactccctt cctagtctct gt 32 <210> 30 <211> 31 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 30 gcattaacct tgactatgtc tttagctcca g 31 <210> 31 <211> 28 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence : Primer <400> 31 attttattac ccaatctgct ccaaacat 28 <210> 32 <211> 26 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 32 aggtgagttg aacagtctga ttttta ■ 26 <210> 33 <211> 25 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 33 gatcctcccc actgggttca ccatt 25 <210> 34 <211> 24 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 34 ggaagtattg gagggtgccc tgcc 24 <210> 35 <211> 48 <212> PRT <213> Retrovirus HTLV-1 <400> 35 Pro Lys Lys Pro Pro Pro Asn Gin Pro Cys Phe Arg Cys Gly Lys Ala 1 5 10 15 Gly His Trp Ser Arg Asp Cys Thr Gin Pro Arg Pro Pro Pro Gly Pro 20 25 30 Cys Pro Leu Cys Gin Asp Pro Thr His Trp Lys Arg Asp Cys Pro Arg 35 40 45 <210> 36 <211> 47 <212> PRT <213> RETROVIRUS RTVL-H <220> <221> SITE <222> (23) <223> Xaa represents stop codon <400> 36 Pro Pro Glu Pro Pro Pro Pro Gly Ala Cys Tyr Lys Cys Gin Lys Ser 1 5 10 15 Gly ' His Trp Ala Lys Glu Xaa Pro Gin Pro Arg lie Pro Pro Lys Pro 20. 25 30 Cys Pro lie Cys Val Gly Pro His Trp Lys Ser Asp Cys Pro Thr 35 40 45 <210> 37 <211> 47 <212> PRT <213> RETROVIRUS RGH-2 <220> <221> SITE <222> (41) <223> Xaa represents stop codon <400> 37 Pro Pro Glu Pro Ser Pro Pro Gly Ala Cys Tyr Lys Cys Gin Lys Ser 1 5 10 15 Gly His Trp Ala Lys Glu Cys Pro Gin Thr Arg lie Pro Pro Lys Leu 20 25 30 Tyr Pro lie Ser Val Gly Pro His Xaa Lys Ser Asp Cys Ser Thr 35 40 45 <210> 38 <211> 47 <212> PRT <213> RETROVIRUS <400> 38 Pro Ser Asp Pro Pro Pro Pro Ala Ser Cys Phe Lys Cys Leu Lys Ser 1 5 10 15 Gly His Trp Thr Lys Glu Cys Pro Gin Pro Gly lie Pro Pro Lys Asp 20 25 30 Ser Pro lie Cys Ala Gly Pro His Trp Lys Lys Asp Cys Pro Pro 35 40 45 <210> 39 <211> 47 <212> PRT <213> RETROVIRUS <220> <221> SITE 10 <222> (41) <223> Xaa represents stop codon <400> 39 Pro Pro Asp Pro Pro Pro Pro Gly Ala Cys Tyr Thr Cys Gin Lys Ser 1 - 5 10 15 Gly His Trp Ala Lys Glu Cys Pro Gin Arg Gly lie Pro Pro Lys Pro 20 25 30 Arg Pro lie Cys Val Gly Pro His Xaa Lys Ser Asp Cys Ser Thr 35 40 45 <210> 40 <211> 47 <212> PRT <213> RETROVIRUS <220> <221> SITE <222> (25) <223> Xaa represents stop codon <220> <221> SITE <222> (41) <223> Xaa represents stop codon <400> 40 Pro Pro Asp Pro Pro Pro Pro Gly Ala Cys Tyr Thr Cys Trp Lys Ser 1 5 10 15 Gly His Trp Ala Lys Glu Cys Pro Xaa Pro Gly lie Pro Pro Lys Pro 20 25 30 Arg Pro lie Cys Val Gly Pro His Xaa Lys Ser Asp Cys Ser Thr 35 40 . 45 <210> 41 <211> 30 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 41 gggaattagt ggaataactc ttttttgttg 30 <210> 42 <211> 27 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 42 catgaaattt ggtgccttga ctcggat 27 11 <210> 43 <211> 28 <212> DNA <213> Artificial Sequence <220> <223> Description of Artificial Sequence: Primer <400> 43 gagatagctg gggagaggta gaggatga 28 <210> 44 <211> 199 <212> DNA <213> RETROVIRUS <400> 44 cacctatgac ctcaggtcct cagacgancc agcccaagaa acatctcacc aatttcaaat 60 ccgatcttct cggcctagcg gctgaagact gacgctgccc gatcgcctcg gaagccccct 120 agaccatcac ggatgccgag ctttgggtaa ctctcacagt ggaagatccc cagccatatg 180 aagacaacct agctggacg .199 <210> 45 <211> 198 <212> DNA <213> RETROVIRUS <400> 45 cacctatgac ctcaggtcct cagacgacca gcccaagaaa catctcacca atttcaaatc 60 cgatcttctc ggcttagcgg ctgaagactg acgctgcccg atcgcctcgg aagcccccta 120 gaccatcacg gatgccgagc tttgggtaac tctcacagtg gaagatcccc agccatatga 180 agacaaccta gctggacg 198 <210> 46 <211> 186 <212> DNA <213> RETROVIRUS <400> 46 tcaggtcctc agacgaccag cccaagaaac atctcaccaa tttcaaatcc gatcttctcg 60 gcttagcggc tgaagactga cgctgcccga tcgcctcgga agcccctaga ccatcacgga 120 tgccgagctt tgggtaactc tcacagtgga agatccccag ccatatgaag acaacctaac 180 tggacg 186 <210> 47 <211> 197 <212> DNA <213> RETROVIRUS <400> 47 cacctatgac ctcaggtcct cagacgacca gcccaagaaa catctcacca atttcaaatc 60 cgatcttctc ggcttagcgg ctgaagactg acgctgcccg atcgcctcgg aagcccctag 120 accatcacgg atgctgagct ttgggtaact ctcacagtgg aagatcccca gccatatgaa 180 gacaacctag ctggacg 197 <210> 48 <211> 129 <212> DNA <213> RETROVIRUS . 12 <400> 48 cggcttagcg gctgaagact gacgctgccc gatcgcctcg gaagccccct agaccatcac 60 ggatgccgag cttcgggtaa ctctcacaat ggaagatccc cagccatatg aagacaacct 120 agctggacg 129 <210> 49 <211> 197 <212> DNA <213> RETROVIRUS <400> 49 cacctatgac ctcaggtcct cagaccgacc agcccaagaa acatctcacc aatttcaaat 60 ccgatcttct cggcttagcg gctgaagact gacgctgccc gatcgcctcg gaagccccta 120 gaccatcacg gatgccgagc tttgggtaac tctcacagtg gaagatccca gccatatgaa 180 gacaacctag ctggacg ' 197 <210> 50 <211> 199 <212> DNA <213> RETROVIRUS <400> 50 cacctatgac ctcaggtcct cagaccgaac cagcccaaga aacatctcac caatttcaaa 60 tccgatcttc tcggcttagc ggctgaagac tgacgctgcc cgatcgcctc ggaagccccc 120 tagaccatca cggatgctga gcttkgggta aytctcacag tggaagatcc cagccatatg 180 aagacaacct agctggacg 199

Inventors: ANDERSSON POUL, CHRISTENSEN TOVE, DISSING SORENSEN PERNILLE, MOLLER LARSEN ANNE, ANDERSSON, POUL, CHRISTENSEN, TOVE, DISSING SORENSEN, PERNILLE, MOLLER LARSEN, ANNE
Applicants: ANDERSSON POUL, CHRISTENSEN TOVE, DISSING SORENSEN PERNILLE, MOLLER LARSEN ANNE, MS RES AS, ANDERSSON, POUL, CHRISTENSEN, TOVE, DISSING SORENSEN, PERNILLE, MOLLER LARSEN, ANNE, MS RESEARCH A/S
Application year: 2001
Main classification: C12N7
IPC codes: A61K31, A61K38, A61K39, A61K45, A61K48, A61P3, A61P25, A61P31, A61P35, A61P37, C07K14, C12N5, C12N7, C12N15, C12Q1