HAMSTER EF-1 alpha TRANSCRIPTIONAL REGULATORY DNA

Abstract: The present invention relates to regulatory DNA sequences derived from the hamster EF-1 alpha gene. The invention further encompasses expression constructs comprising regulatory DNA of the invention, host cells transformed or transfected with the regulatory DNA and methods of increasing gene transcription utilizing the regulatory DNA. Expression constructs comprising regulatory DNA of the invention operably linked to specific gene sequences are also comprehended.

Description: HAMSTER EF-lα TRANSCRIPTIONAL REGULATORY DNA BACKGROUND OF THE INVENTION Transcription of any given eukaryotic gene is carried out by one of three RNA polymerase enzymes each of which acts on a particular subset of genes. While transcription of large ribosomal RNAs is performed by RNA polymerase I and small ribosomal RNA and tRNA is transcribed by RNA polymerase HI, protein-coding DNA sequences and most small nuclear RNAs are transcribed by RNA polymerase π. For each type of gene, transcription requires interaction of the appropriate polymerase with the gene's promoter sequences and formation of a stable transcription initiation complex. In general, transcription from any of the three polymerases also requires interaction of some binding factor with the promoter sequence and recognition of the binding factor by a second factor which thereby permits polymerase interaction with the gene sequence. While this mechanism is the minimum requirement for transcription with RNA polymerases I and in, the process leading to transcription with RNA polymerase II is more intricate. Presumably due to the vast array of gene sequences transcribed by RNA polymerase II and the fact that the regulation patterns for these genes are highly variable within the same cell and from cell to cell, transcription by RNA polymerase π is affected by binding of numerous transcription factors in the initiation complex in addition to the interactions of other binding proteins to regulatory DNA sequences other than the promoter. These other binding proteins can serve to activate transcription beyond a basal level or repress transcription altogether. Repressor binding can also be viewed as a means to prevent activation in view of observations that basal transcriptional in higher eukaryotes is normally very low. Activation, on the other hand, is ordinarily the end response to some physiological signal and requires either removal of repressor binding proteins or alteration in chromatin structure in order to permit formation of an active transcription initiation complex. At the core of transcription complex formation, and a prerequisite for basal levels of gene expression, is the promoter sequence called the "TATA" box which is located upstream from the polymerase π transcription start site. The TATA box is the binding site for a ubiquitous transcription factor designated TFHD, but as mentioned, transcription from the promoter sequence in most genes is strongly influenced by additional regulatory DNA sequences which can either enhance or repress gene transcription. DNA elements of this type are in variable positions with respect to coding sequences in a gene and with respect to the TATA box. These additional transcriptional regulatory elements often function in a tissue- or cell-specific manner. In expression of recombinant proteins, it is particularly important to select regulatory DNA which includes the promoter TATA sequence and additional regulatory elements compatible with the host cell's transcriptional machinery. For this reason, regulatory DNA endogenous to the host cell of choice is generally preferred. Alternatively, considerable success has been achieved using regulatory DNA derived from viral genomic sequences in view of the broad host range of viruses in general and the demonstrated activity of viral regulatory DNA in different cell types. Well known and routinely utilized viral regulatory DNAs for recombinant protein expression include, for example, the SV40 early gene promoter/enhancer [Dijkema, et al. , EMBO J. 4:161 (1985)], Rous sarcoma virus long terminal repeat DNA [Gorman, et al. , Proc. Natl. Acad. Sci. (USA) 79:6111 (1982b)], bovine papillomavirus fragments [Sarver, et al., Mo. Cell. Biol. 1:486 (1981)] and human cytomegalovirus promoter/enhancer elements [Boshart et al. , Cell 41:521 (1985)]. Despite the broad range of cell types in which viral regulatory DNAs have been demonstrated to be functional, it is possible that non-viral promoter/enhancer DNA elements exist which permit elevated transcription of recombinant proteins in specific cell lines through more efficient use of host cell transcriptional machinery. Thus there exists a need in the art to identify promoter/enhancer regulatory DNA sequences which function in homologous and heterologous cell types to increase recombinant protein expression and provide a high yield of a desired protein product. Of particular importance is the need to identify such promoter/enhancer regulatory DNA which can be utilized most efficiently in mammalian cells in order to increase production of recombinant proteins in vitro which are glycosylated in a manner akin to glycosylation patterns which result from in vivo protein expression. Proteins expressed in this manner and administered therapeutically or prophylactically are less likely to be antigenic and more likely to be physiologically active. Regulatory DNA sequences of this type are also amenable to being inserted into host cells in order to increase expression of genes endogenous to the host cells or genes previously introduced into the genome of the host cell by techniques well known and routinely practiced in the art. SUMMARY OF THE INVENTION The present invention relates to purified and isolated polynucleotides derived from hamster cells which regulate gene transcription. The polynucleotides comprise regulatory DNA sequences 5 ' to translated regions of the Chinese hamster ovary EF-lα gene. Preferred DNA of the invention is designated the CHEF1 regulatory DNA and includes approximately 3.7 kb DNA extending from a Spel restriction site to the initiating methionine (ATG) codon of the EF-lα protein. Polynucleotides of less than 3.7 kb are also comprehended by the invention in as much as the smaller fragment polynucleotides are capable of increasing transcription of an operatively linked gene. Active fragments of the DNAs of the invention, defined by the capacity to regulate (i.e. , enhance) gene transcription, are readily identifiable through deletion studies well known and routinely practiced in the art. Regulatory DNA of the invention includes polynucleotides isolated from natural sources, such as cultured cells, as well as polynucleotides produced by enzymatic or purely chemical synthesis. Thus, in one embodiment, the invention provides a method for preparing CHEFl DNA from a genomic library. Alternatively, the DNA may be constructed by enzymatic synthesis, utilizing, for example, the polymerase chain reaction (PCR), or purely chemical synthesis wherein single nucleotides are successively added or overlapping oligonucleotides are hybridized and ligated. The DNA sequence of the most preferred embodiment is set out in SEQ ID NO: 1. The invention further embraces DNA sequences which hybridize under stringent conditions to DNA set out in SEQ ID NO: 1. Stringent conditions include washing at about 65 °C in buffer containing about 2X SSC and about 0.1 % SDS or equivalent conditions. The invention further comprehends plasmid DNA comprising CHEFl regulatory polynucleotides. Plasmids of the invention may also include DNA sequences encoding a protein of interest or RNA product of interest operatively linked to the CHEFl polynucleotide sequences. The invention further comprehends host cells transformed, transfected, and or electroporated with polynucleotides or plasmids of the invention. Plasmid DNA of the invention may be integrated into the genome of the host cell or may exist in the cell in closed circular plasmid form. Preferred plasmids of the invention particularly amenable for insertion of desired DNA sequences include plasmids pDEF14 and pDEF2. Bacterial host cells transformed with pDEF14 and pDEF2 were deposited on April 9, 1997, and March 4, 1997, respectively, with the American Type Culture Collection, 12301 Parklawn Drive, Rockville, Maryland 20852 and assigned Accession Numbers 98389 and 98343, respectively. The invention also comprehends linear vector DNA comprising CHEFl polynucleotides. Vectors of the invention may be obtained from viral sources or may be synthesized in vitro. The invention further comprehends host cells transfected or electroporated with the linear vector sequences. DNA of this type is particularly useful for expression of heterologous gene sequences operatively linked to the CHEFl DNA sequences, or for site directed homologous recombination wherein CHEFl sequences can be inserted into the genome of a host cell in order to modulate expression of an operatively linked sequence. The invention further provides chimeric recombinant DNA molecules wherein the CHEFl DNA is operably linked to (i.e. , promotes transcription of) gene sequences encoding a desired protein product. Chimeric molecules in general are those comprising domains not normally found in association in a wild-type environment; in the present invention, a chimeric DNA can comprise part or all of the CHEFl regulatory DNA in association with a DNA sequence other than the gene encoding hamster EF-lα protein. Protein products encoded by the chimeric molecules include physiologically active proteins, portions or subunits of active proteins, as well as marker, or reporter, proteins. The polynucleotide sequence encoding the protein product may be derived from complementary DNA (cDNA), genomic DNA, synthetic DNA, or DNA derived from combinations of molecules of these types. Protein products may be endogenous (i. e. , normally found in the CHO genome absent introduction of DNA by transformation, transfection, or the like) to Chinese hamster ovary (CHO) cells. In addition, protein products may be encoded by exogenous sources, an exogenous source being one other than the genome of a CHO cell, including, for example, a synthesized DNA. Preferred chimeric molecules of the invention include those wherein CHEFl DNA is operatively linked to DNA encoding: (i) the heavy chain of anti-ICAM3 antibody ICM3, (ii) the light chain of ICM3, (iii) the heavy chain of anti-CDl l/CD18 antibody hu23F2G, (iv) the light chain of hu23F2G, (v) chitinase, (vi) platelet activating factor acetyl hydrolase (PAF-AH), and (vii) macrophage derived chemokine (MDC). Bacterial host cells transformed with plasmid DNA comprising the chimeric molecules were deposited on April 1, 1997 with the American Type Culture Collection and assigned Accession Numbers (i) 98381 , (ii) 98382, (iii) 98383, (iv) 98384, (v) 98385, (vi) 98386, and (vii) 98387, respectively. The invention further relates to host cells transformed or transfected with the CHEFl DNAs of the invention. Preferred host cells of the invention are derived from Chinese hamsters (Cήcetulus griseus) in which the CHEFl regulatory DNA would be expected to provide high levels of protein expression. The invention, however, embraces other cell types derived from alternative species, including, for example, from Armenian hamsters (Cήcetulus migratoris) or Syrian (golden) hamsters (Mesocricetus auratus), as well as cell types derived from animals of other genera. Cells can be obtained from lung, ovary, peritoneum, muscle, pancreas, kidney, melanoma, or somatic sources, as well as from whole fetus or whole embryo. Host cells of the invention listed above, as well as other cell types, for example, myeloma cell lines, in which the CHEFl regulatory DNA would be expected to provide high levels of transcription, can be obtained from the American Type Culture Collection or alternatively, cultured directly from animal sources. Recombinant molecules of the invention which include CHEFl regulatory DNA will provide for increased levels of mRNA expression of the operably linked heterologous (i.e. , not normally found in the host genome absent introduction of polynucleotides by tranfection, transformation, or the like) polynucleotides. Depending on the nature of the polynucleotide linked to the CHEFl polynucleotide sequences, increased transcription would ultimately result in elevated levels of polypeptides, or increased levels of various RNA species in those instances wherein the linked polynucleotide encodes, for example, transfer RNA, ribosomal RNA, small nuclear RNA and the like. RNA species may also include anti-sense RNA complementary to mRNA transcribed from an endogenous or exogenous gene sequence. Increased polypeptide translation would necessarily depend on the presence of appropriate translation signals being present in the mRNA. The invention further provides methods by which the CHEFl DNA is inserted into specific sites in genomic DNA of host cells in order to increase transcription levels of an endogenous gene sequence. Homologous recombination can be utilized to insert all or part of the CHEFl DNA. In host cells modified in this manner, CHEFl DNA is operably linked to coding DNA sequences. See, for example, PCT International Publication No. WO 94/12650; PCT International Publication No. WO 92/20808; and PCT International Publication No. WO 91/09955. Necessarily, the invention embraces altered genomic DNA sequences wherein the CHEFl regulatory DNA has been inserted. Alternatively, the invention embraces host cells wherein exogenous DNA is inserted adjacent and in an operative position with respect to CHEFl DNA present in the genome. Host cells of this type include CHO cells and the inserted sequence either replaces EF-lα coding DNA or is inserted between CHEFl regulatory DNA and EF-lα coding DNA. The invention also embraces host cells other than CHO cells wherein CHEFl DNA has previously been inserted into the genome and additional DNA is subsequently inserted into an operatively linked position. The invention further provides methods for increasing transcription of a desired gene comprising the step of introducing into a host cell a polynucleotide comprising a hamster EF-lα regulatory sequence in such a manner that the regulatory sequence integrates into the genomic DNA of the host in an operatively linked position with respect to the desired gene. The invention further comprehends a method for increasing transcription of a desired gene comprising the step of introducing into a host cell a polynucleotide comprising a hamster EF-lα regulatory sequence and a targeting sequence, said targeting sequence constructed in a manner which permits integration of the regulatory sequences at a position operatively linked to the desired gene encoding a protein other than EF-lα. The methods of the invention include means to increase transcription of genes endogenous to CHO cells as well as means to increase transcription of genes exogenous to CHO cells. Recombinant molecules of the invention may be used for the production of transgenic animals wherein chimeric recombinant DNA including CHEFl DNA operably linked to a DNA sequence of interest is introduced into developing germ or somatic cells of an animal. Chimeric recombinant molecules may be introduced for example by microinjection, and when carried out using germ cells, cells in the resulting animal may all include the recombinant DNA of the invention. Alternatively, chimeric recombinant DNA of the invention may be introduced into cells of an embryo and a plurality of cells in the resulting animal may include DNA of the invention. CHEFl DNA is also useful for identification of closely related regulatory DNA sequences which may impart increased gene expression over and beyond that which CHEFl permits. Similarly, knowledge of CHEFl DNA sequences permits construction of synthetic DNAs, either from de novo synthesis or single or multiple modifications of CHEFl sequences, the resulting synthetic DNAs having sequences similar to CHEFl but capable of promoting higher levels of gene transcription. DETAILED DESCRIPTION OF THE INVENTION The present invention is illustrated by the following examples. Example 1 describes cloning of the hamster EF-lα gene and the cognate CHEFl regulatory DNA. Example 2 relates to subcloning and sequence analysis of the CHEFl regulatory sequence. Example 3 provides characterization of the CHEFl promoter polynucleotide, and Example 4 provides a description of how various expression vectors were constructed which included CHEFl DNA. Example 5 describes transfection assays utilized to determine the efficiency of the CHEFl regulatory DNA. Example 6 details a comparison of recombinant protein expression levels using either the CHEFl regulatory DNA or the cytomegalovirus (CMV) promoter. Example 7 examines differences in regulatory capacity of CHEFl DNA of different lengths. Example 1 Cloning of CHEFl A Chinese hamster ovary genomic DNA library (CHO-K1) (Stratagene, La Jolla, CA) was screened with cDNA encoding human EF-l in an attempt to isolate a hamster homolog to the human EF-lα gene. The CHO-K1 library, a partial Sau3A digest in Lambda FIX ® π cloning vector, was obtained from Stratagene (La Jolla, CA) in host cell strains XL- 1 -Blue MRA and XLl-Blue MRA (P2). The host cells were prepared according to the manufacturer's suggested protocol with the following modifications. Briefly, cells from glycerol stocks were streaked on LB plates containing no antibiotic. Single colonies were selected for inoculating liquid LB media and grown to late log phase and an OD 600 of approximately 0.9. At this point, cells were either stored according to manufacturer's suggested protocol or used immediately as described below. In preparation of cultures for plating, single colonies picked from plates prepared as described above were used for inoculation and cells were grown in 50 ml LB medium supplemented with 0.5 ml 1 M MgSO 4 and 1 ml 10% maltose in deionized water. Following overnight growth at 30° C, cells were harvested by centrifugation in a tabletop centrifuge (2000 rpm for 5 minutes at room temperature) and resuspended in 10 mM MgSO 4 at an OD 600 of 0.5 Lambda phage, supphed by the manufacturer, was diluted in SM buffer (prepared to 1 liter stock containing 5.8 g NaCl, 2.0 g MgSO 4 H 2 O, 50 ml 1 M Tris-HCl, pH 7.5, and 5 ml 2% [w/v] gelatin) over a range of 10- to 10 5 -fold, and 2 μl of each dilution was added to 400 μl host cells in 10 mM MgSO 4 (ODr ø « 0.5). The resulting mixture was incubated for 15 minutes at 37°C to allow attachment of phage to the cells, top agar (0.75 % LBM agarose at 48 °C) was added, and each mixture plated in duplicate on LBM agarose plates. Results indicated a titer of 3 x 10° plaque forming units (pfu)/μl phage stock. Fresh host cells were prepared as described above prior to screening of the library. Approximately 50,000 phage pfu were added to 600 μl host cells (at OD 600 ~ 0.5) with 6.5 ml 0.75 % LBM agarose at 48°C. The mixture was spread onto agarose plates which were then incubated for approximately 8 hours at 37 °C. The plates were subsequently cooled for 5 hours at 4°C to prevent top agarose from sticking to nitrocellulose overlays. Membranes, BA-85, 0.45 μm pore size, (S+S, Keene, NH) were placed over the plates and transfer continued for two minutes. Membranes were removed from the plates and the transferred DNA denatured in 1.5 M NaCl/0.5 M NaOH for two minutes. Filters were neutralized for 5 minutes in 1.5 M NaCl/1.0 M Tris-HCl (pH 8.0), blotted on Whatman 3-MM paper, and baked under vacuum at 80 °C for approximately 1.5 to 2 hours. A human EF-lα cDNA sequence [Uetsuki, et al. J. Biol. Chem. 264:5791-5798 (1989)], previously shown to be 95 % identical to the coding region of CHO EF-lα [Hayashi, et al. J. Biochem. 106:560-563 1989], was used as probe for library screening and prepared as described below. The 1.4kb human EF-l probe was derived from plasmid M0107, a pRc/CMV (Invitrogen, San Diego, CA) vector containing human EF-lα cDNA inserted at an EcøRI site. In order to first confirm that plasmid M0107 contained the expected human cDNA, insert DNA was sequenced with 3' and 5' vector primers. 94-17 AGGCACAGTCGAGGCTGATC (SEQ ID NO: 2) 94-18 TTCCAGGGTCAAGGAAGGCA (SEQ ID NO: 3) The first 263 bp of the insert showed greater than 90% identity with the published human EF-lα coding sequence, and while the sequence in the 3' end was difficult to accurately determine, small stretches could be aligned with the expected sequence. Combined, these alignments indicated the plasmid encoded the desired sequence. The entire human insert was removed from the plasmid with EcoRL digestion and a cDNA band of 1.4 kb was gel purified twice using QIAGEN QIAquick Gel Extraction Kit according to the manufacturer's suggested protocol. The DNA was eluted into 50 μl TE, the resulting solution concentrated in a Microcon-10 (Amicon, Beverly, MA) to 25 μl, and an aliquot labeled with 32 P-α-dTTP and 32 P-α-dCTP using a Boehringer Mannheim Random Primed DNA labelling kit according to the manufacturer's suggested protocol. Labeled probe was purified using a G50 spin column to remove unincorporated nucleotides and comparison of purified probe to the pre-spin aliquot showed 46% incorporation of the radioactive label, with counts of 5 x 10 5 cpm/min//xl. The nitrocellulose membranes prepared as described above were probed as follows. A stock pre-hybridization/hybridization buffer solution was prepared which included 22.5 ml 20X SSC, 30.0 ml 50X Denhardt's solution, 3.0 ml 1 M phosphate buffer (pH 6.8) (69 ml 1 M NaH 2 PO 4 , 31 ml 1 M Na 2 HPO 4 ), 0.75 ml 20% SDS, and 78.75 ml dILO. For pre-hybridization, 1.4 ml 10 mg/ml salmon sperm DNA (Stratagene) was boiled 5 minutes with 0.6 ml dH 2 O, then added to 7 ml dH 2 O and 72 ml stock buffer solution. Filters were incubated at 65 °C for a minimum of two hours in pre-hybridization buffer. For hybridization, 30 μl probe, 200 l 10 mg/ml salmon sperm DNA and 770 μl dH 2 0 were combined, boiled for 5 minutes, and added to 36 ml stock buffer with 3 ml dH 2 O. The pre-hybridization solution was removed from the filters, hybridization buffer added and the filters incubated at 65 °C overnight. Following hybridization, filters were washed for three hours at 65°C with three changes of buffer containing 2X SSC and 0.1 % SDS, and then autoradiographed for 48 hours. Forty-seven positive colonies were identified and picked into 1 ml SM buffer containing 20 μl chloroform. In order to weed out possible pseudogenes missing one or more introns, PCR primer pairs were designed to flank two introns each: primers 95-136 (SEQ ID NO: 4) and 95-137 (SEQ ID NO: 5) spanning introns 2 and 3; primers 95-138 (SEQ ID NO: 6) and 95-139 (SEQ ID NO: 7) spanning introns 3 and 4; primers 95-140 (SEQ ID NO: 8) and 95-141 (SEQ ID NO: 9) spanning introns 4 and 5; and primers 95-142 (SEQ ID NO: 10) and 95-143 (SEQ ID NO: 11) spanning introns 6 and 7. 95-136 (SEQ ID NO: 4) GCCACCTGATCTACAAATGT 95-137 (SEQ ID NO: 5) GAGATACCAGCCTCAAATTC 95-138 (SEQ ID NO: 6) ATGTGACCATCATTGATGCC 95-140 (SEQ ID NO: 8) GTTGGAATGGTGACAACATG 95-141 (SEQ ID NO: 9) CAGGTTTTAAAACACCAGTC 95-142 (SEQ ID NO: 10) AATGACCCACCAATGGAAGC 95-143 (SEQ ID NO: 11) ACAGCAACTGTCTGCCTCAT Predicted size of PCR products using CHO EF-1 α template DNA was based on size and location of introns in the published human EF-l sequence. Each PCR reaction included 2 μl phage, 2.5 μl each primer of the appropriate pair (100 μg/ml), 2 μl 2 mM dNTP mix, 2.5 μl 10X PCR buffer (Roche Molecular Systems, Branchburg, NJ), 1.5 μl 25 mM MgCl 2 , 0.125 μl Taq polymerase (5 units/μl) (Perkin Elmer) and 11.8 μl dH 2 O. Amplification was carried out for 4 minutes at 94° C, followed by 30 cycles of 1 minute at 90° C, 2 minutes at 50° C, and 4 minutes at 72°C. Amplification products were separated on 1.2% agarose gels run in IX TAE. Three of the 47 positive plaques were found to encode true genes (#2, 7 and 40) containing all introns and the three positive samples were subjected to tertiary screening as follows. Plating cultures were prepared as described above with 10 to 10 5 dilution of stocks prepared for each of the three positive plaques. Twenty to fifty isolated plaques from each stock were screened by PCR with the following results. Clone #2 yielded two positives (designated 2.12 and 2.17) from twenty screened, clone #1 yielded one (designated 7.44) in fifty screened, and clone #40 yielded one positive (designated positive 40.24) in forty screened. Phage DNA was isolated from each of the four samples as follows. XL-1 Blue MRA (P2) host cells were streaked out on LB agarose plates and grown overnight at 37° C. A single colony was selected to inoculate 50 ml of LB media (containing 0.2% maltose and 10 mM MgSO 4 ) and the culture grown overnight at 30° C. Cells were harvested by centrifugation for 5 minutes at room temperature at 2000 rpm in a tabletop centrifuge and the cells resuspended in 50 ml 10 mM MgSO 4 . The resuspended host cells (50 μl) were mixed with 100 μl stock of each positive phage and incubated for 15 minutes at 37 °C to permit phage attachment to the cells. Approximately 500 μl LBM media was added and the mixture shaken for 2 hours at 37° C. An additional 200 μl of host cells was added and incubation continued for an additional 15 minutes at 37°C. Top agar (8 ml of 0.75 % LBM agarose at 48 °C) was added after which the mixture was plated and grown overnight at 37°C. Following overnight growth, 12 ml of lambda diluent (10 mM Tris-HCl, pH 7.5, 10 mM MgSO 4 ) was added to each plate and the plates rocked gently for 2 hours. The diluent was removed and centrifuged for 10 minutes, 4000 x g, in a tabletop centrifuge. To the supernatant, 1 μl each of 1 mg/ml RNase A and 1 mg/ml DNase I were added and incubation carried out at 37 °C for 15 minutes. An equal volume of precipitation buffer (20% PEG 8000, 2 M NaCl, 20 mM Tris-HCl, pH 7.5, 10 mM MgSO 4 ) was added followed by incubation on ice for one hour, after which the mixture was centrifuged at 8000 x g for 20 minutes, the supernatant removed, and the pellet air dried for 10 minutes at room temperature. The pellet was resuspended in 500 μl TE, centrifuged briefly to remove particulates, and the supernatant transferred to a clean 1.65 ml epitube. Approximately 2.5 μl 20% SDS was added (with 5 minutes incubation at 65 °C), followed by addition of 2.5 μl 10 mg/ml proteinase K (with incubation for one hour at 65 °C) and 10 μl 5 M NaCl. The mixture was extracted once with an equal volume of phenol: CHC1 3 and once with an equal volume of CHC1 3 . An equal volume of isopropanol was added followed by incubation at -70 °C for 3 hours, after which the mixture was centrifuged for 15 minutes in an epifuge at top speed. The resulting pellet was washed with 70% ethanol, air dried, and resuspended in 100 μl TE. Example 2 Subcloning of the EF-lα Regulatory Sequence To determine the size of the insert EF-lα DNA, phage DNA prepared as described in Example 1 was digested with Nøtl and the resulting restriction fragments separated on a 0.6% IX TAE agarose gel. Clones 2.12 and 2.17 showed identical digestion patterns with bands of 11 kb and 4.5 kb in addition to the expected flanking lambda fragments of 19 kb and 10 kb. Clones 7.44 and 40.24 also showed identical digestion patterns with insert bands of 12 kb and 7 kb which, together with Clones 2.12 and 2.17 digest information, indicated the presence of an internal Nøtl restriction site in the EF-lα DΝA. Insert fragments from clones 2.12 and 7.44 were subcloned as follows. Phage DΝA (60 μl) prepared as described in Example 1 was digested with Nøtl, after which the digested DΝA was precipitated with addition of 20 μl 3 M sodium acetate and 400 μl 100% ethanol. Precipitated DΝA was collected by centrifugation, washed in 200 μl 70% ethanol, air dried 15 minutes, resuspended in 20 μl TE and heated to 65 °C for 10 minutes before addition of 2 μl loading buffer for electrophoresis. DΝA was separated using agarose gel electrophoresis and bands of 4.5 kb, 7 kb, 11 kb, and 12 kb were cut out as agarose slices. DΝA was extracted from each gel slice using the QIAGEΝ QIAquick gel extraction kit according to the manufacturer's suggested protocol. Band purity and concentration were estimated by separating a 5 μl aliquot of each isolated fragment on a 0.6% IX TAE agarose gel. Individual fragments were separately ligated to Nøtl digested pBluescript SW + . In hgations with the 11 and 12 kb fragments, the linearized vector was treated with calf alkaline phosphatase prior to introduction of the fragment insert. Two μl of each ligation were used to electroporate 40 μl XL-1 Blue electrocompetent cells. Transformed cells were plated on LBM/carb agarose plates with 40 μl 5 % X-gal in dimethylforamide (DMF) and 20 μl 0.1 M IPTG per plate. Cells were incubated overnight at 37 °C and in the morning, plates were moved to 4° C to increase intensity of blue color. In a secondary screen, white colonies were streaked on LBM/carb agarose plates containing X-gal and IPTG, as described above, and colonies that were white the following day were grown up in 3 ml of LBM/carb overnight at 37° C. Plasmid DΝA from white colonies grown overnight was prepared using a WIZARD Plus Minipreps DΝA Purification System (Promega, Madison, WI) according to the manufacturer's suggested protocol. Restriction analysis of the isolated plasmid DΝA indicated that the 4.5 kb, 7 kb and 12 kb fragments were successfully ligated into the pBluescript SW + vector, and the resultant plasmids were designated pSK/EFl.4.5, pSK/EF1.7 and pSK/EF1.12, respectively. Each plasmid was then prepared using a QIAGEN midi prep kit according to the manufacturer's suggested protocol. PCR was carried out on each new vector, titrating out the template DNA and using the coding region primers (SEQ ID NOs: 4 through 11, used in pairs as described above to screen for pseudogenes lacking one or more of the various introns). Titration was performed after it was found that, at high concentrations, all three fragments were shown to include the complete EF-l coding region suggesting possible cross contamination between the three plasmid preparations. In the titration, PCR was carried out in reactions containing 2.5 μl template DNA at a concentration of 0.001, 0.01, 0.1, 1 or 10 ng/μl, and including 2.5 μl 10X PCR Buffer (Perkin Elmer), 2.0 μl 2 mM dNTP mix, 1.5 μl 25 mM MgCl 2 , 0.125 μl Taq polymerase (Perkin Elmer), and 11.4 μl dH 2 O. Amplification was carried out under the following conditions: 4 minutes at 94°C, followed by 30 cycles of 1 minute at 90°C, 2 minutes at 50°C, and 4 minutes at 72°C. Results indicated that the complete EF-l coding region was located within the 4.5kb and 7kb fragments. A restriction map was generated for each insert using the Stratagene FLASH Nonradioactive Gene Mapping Kit designed for use with the Lambda FIX π ® vector. Instead of using phage DNA, however, plasmid DNA excised with Nσtl digestion from the pSK vectors described above was used. The mapping protocol was essentially that suggested by the manufacturer. Briefly, plasmids were sequenced with Ml 3 (SEQ ID NO: 12) and Ml 3 reverse (SEQ ID NO: 13) primers (complementary to regions within the pBluescript SW + multiple cloning region) to locate the T3 (SEQ ID NO: 14) and T7 (SEQ ID NO: 15) primer sequences internal to the Nøtl site for each insert. Ml 3 GTAAAACGACGGCCAGT (SEQ ID NO: 12) M13rev GGAAACAGCTATGACCATG (SEQ ID NO: 13) T3 AATTAACCCTCACTAAAGGG (SEQ ID NO: 14) T7 GTTAATACGACTCACTATAGGGC (SEQ ID NO: 15) The T7 and 73 primers were used as probes in the gene mapping protocol. Since the EF-lα insert was shown to include an internal Notl site, the fragment pairs (4.5kb/llkb and 7kb/12kb) were predicted to include one or the other of the primer sequences and it was thus determined that the 4.5 and 12 kb inserts included the T7 primer sequence while the 7 kb insert had the T3 sequence. The 4.5 kb and 7 kb inserts containing the EF-lα coding region were excised from the vector by Notl digest. Digested DΝA was separated on an agarose gel, the separated fragments cut from the gel, and DΝA isolated from each gel slice using a QIAGEΝ QIAquick gel extraction kit according to the manufacturer's suggested protocol. Mapping was carried out using seven different enzymes in partial restriction digests. Reaction products were separated on agarose gel, DΝA was transferred to Duralon-UV Nylon membrane and probed with T3 or T7 oligonucleotides as probe. The band sizes were measured and restriction maps formulated. Plasmid pSK/EF1.7 was sequenced with the internal primers designed originally for the PCR screen (SEQ ID NOs: 4 through 11 [primers 95-136 - 95-143, previously described]) to insure that the gene sequence was that of the previously identified protein. Orientation of the coding region was determined and additional primers designed that allowed sequencing to the internal Notl site. The sequence of the entire coding region was determined, which was then compared to the expected cDΝA sequence described in Hayashi, et al. [supra]. Sequence analysis confirmed that the isolated DΝA did, in fact, encode the same EF-lα sequences as that described by Hayashi [supra]. In addition, the sequence of the first exon was identical to the previously published hamster EF-lα cDNA sequence at the 5 ' end [Hayashi, supra] and seven introns were identified giving a structure similar to that known for the human homolog. The sequence and restriction map obtained from the 7 kb fragment indicated that a portion of the 5 ' flanking intron and the promoter were located in the 12 kb fragment 5 ' to the internal Notl site. A Spell Notl 3 kb fragment 5 ' to the internal Notl site was excised from the 12 kb insert and subcloned into pBluescriptSK + previously digested with the same enzymes and the resulting plasmid was designated pSK/EF1.3. The 3 kb fragment was mapped as described above using Kpnl and Clal in order to confirm restriction sites and sequenced using an Erase-a-Base kit (Promega, Madison, WI) making use of the Clal and Kpnl sites to create 5 ' and 3 ' extensions, respectively. Sequence analysis indicated regions containing the promotor, TATA box, and a 0.9 kb intron in the 5 ' untranslated flanking region that was the same length as the first intron in the human gene [Uetsuki, 1989, supra]. The sequence for the CHEFl promoter and 5 ' intron is set out in SEQ ID NO: 1 , the intron comprising nucleotides 2699 through 3641. Example 3 Characterization of the CHEF Regulatory DNA Sequence upstream of and including the ATG start codon of the hamster EF-lα gene is set out in SEQ ID NO: 1. Most of the identifiable transcription factor binding sites appear to be 3' to the upstream Sacl site located 1.56 kb 5 ' to the initiating ATG codon of the EF-1 α gene. Each of the expression vectors including the CHEFl sequences described below, however, also contain 2 kb of CHEFl sequence 5 ' to the Sacl site. Sequencing indicated the presence of a perfect consensus TATA box located approximately 1 kb 5 ' to the initiating ATG start codon and the region between the upstream Sacl site and the TATA box includes numerous potential transcription factor binding sites [Boulikas, Crit. Rev. Euk. Gene Exp. 4: 117-321 (1994)], including Spl sites (SEQ ID NOs: 16 or 17), ATF sites (SEQ ID NO: 18), and NF-1 sites (SEQ ID NO: 19). GGCGGG SEQ ID NO: 16 GGGCGG SEQ ID NO: 17 TGACGY(C/A)R SEQ ID NO: 18 TTGGCN 5 . 6 (T/G)CCR SEQ ID NO: 19 Similar to the human EF-lα gene, [Uetsuki, et al. , supra], there is a 943 bp intron in the 5 ' untranslated region (UTR) of the hamster EF-lα gene which is apparent from the location of splice donor and acceptor sequences. However, using Geneworks DNA analysis program, the sequence of the intron in the 5 ' UTR was found to be only 62 % identical to that in the human gene. The 5 ' intron includes numerous potential transcription factor binding sites, roughly equal to the number of binding sites between the SαcI site and the TATA box, indicating that the 5 ' intron my be important for optimal transcription from the EF-l promoter. Using Geneworks DNA Analysis Program, the CHEFl sequence from the upstream Sacl restriction site downstream to, but not including, the 5 ' intron sequences was found to be 64% identical to the human EF-lα sequence. A comparison of the location of Spl transcription factor binding sites in both the human and hamster regulatory sequences is shown in Table 1. The complete human EF-lα gene sequence [Uetsuki, et al. , supra] is set out in SEQ ID NO: 29. Table 1 Distance of Spl Sites from the TATA Box Hamster Human Nucleotide Position Nucleotide Position -424 -335 -304 -220 -183 -208 -171 432 -151 476 -135 573 -26 581 63 690 156 168 257 261 425 495 589 594 688 Example 4 Construction of Expression Plasmids Numerous plasmids utilized in subsequent examples were constructed according to the following procedures. Plasmid ρSV2-dhfr (ATCC Accession No. 37146) was digested with Sphl/BaniHL and a 1.8 kb fragment encoding dihydrofolate reductase (DHFR) purified (Fragment 1). The DHFR encoding fragment also included SV40 promoter/operator and polyadenylation sequences located 5 ' and 3 ', respectively, in relation to the dhfr gene. Plasmid pSL1190 (Pharmacia) was digested with Ht ' ndHI, the overhanging ends filled in with Klenow, and the blunt ended DNA re-ligated to destroy the Hindm site giving plasmid pSL1190Η which was then digested with Sphl/BamHL and a 3.4 kb fragment purified (Fragment 2). The pSV2-dhfr 1.8 kb fragment (Fragment 1) was ligated to the pSL1190H 3.4 kb fragment (Fragment 2) to give plasmid pSL1190H-dhfr. Plasmid pSL1190H-dhfr was modified to eliminate several restriction sites as follows. The plasmid was first digested with XballNhel (giving complementary overhanging ends) and the linear plasmid re-ligated eliminating both the Xbal and Nhel sites. In the second procedure, pSLl 190H- dhfr was digested with HiruΩJI, the overhanging ends filled in with Klenow, and the linear plasmid re-ligated to eliminate the Hindm site. In the third process, pSL1190H-dhfr was digested with BgM, the overhanging ends filled in with Klenow, and the linear plasmid re-ligated to eliminate the BgtH site. The end result of these three steps produced plasmid pSL1190H-dhfr/NXHB, wherein Xbal, Nhel, Hindm, and BgM sites were destroyed. Plasmid pSL1190H-dhfr/NXHB was then digested with Ecom/BamΗl and a NPB1/NPB2 linker (constructed from annealing oligonucleotides NPB1 and NPB2 [SEQ ID NOs: 20 and 21) inserted to give plasmid pSL/dhfr/Notl having a unique Notl restriction site. ΝPB1 GATCGCGGCCGCGTTTAAACGGATCC (SEQ ID NO: 20) NPB2 AATTGGATCCGTTTAAACGCGGCCGC (SEQ ID NO: 21) Resulting plasmid pSL/dhfr/Notl was digested with _4_;/j718ΛBαraHI and a 1.8 kb fragment encoding DHFR purified (Fragment 3). Plasmid pRc/CMV (Invitrogen, San Diego, CA) was digested with AspllS/BgM in order to remove CMV promoter and bovine growth hormone (BGH) polyadenylation DNA and a 3.7 kb fragment purified (Fragment 4). The 1.8 kb pSL/dhfr/Notl fragment encoding DHFE with SV40 promoter/operator and polyadeylation sequences (Fragment 3) was ligated to the 3.7 kb pRc/CMV fragment (Fragment 4) to give plasmid pRc/DHFR/Notl. Plasmid pRc/CMV was digested with Asp718/Xbal and a 0.8 kb fragment encoding BGH polyadenylation DNA purified (Fragment 5). Plasmid pRc/DHFR Notl was digested with BamUI/AspllS and a 4 kb fragment with DHFR, SV40 promoter/operator and polyadenylation sequences purified (Fragment 6). Plasmid pCEP4 (Invitrogen, San Diego, CA) was digested with BgM/ Sacl and a 0.7 kb fragment encoding the CMV promoter purified (Fragment 7). The 0.8 kb pRc/CMV fragment (Fragment 5), the 4 kb pRc/DHFR/Notl fragment (Fragment 6), the 0.7 kb pCEP4 fragment (Fragment 7), and a synthetic SacllXbal adaptor fragment were combined in a 4-way ligation to give plasmid pDCl. The adaptor was constructed by annealing oligonucleotides SXP1 and SXP2. SXP1 (SEQ ID NO: 22) 5-CGTTTAGTGAACCGTCAGATCTACATAACAACATTCCTC CTCTAAAGAAGCCCCAAGCTTGATATCTGCAGAATTCT-3' SXP (SEQ ID NO: 23) 5 '-CTAGAGAATTCTGCAGATATCAAGCTTGGGGCTTCTTTAGAG GAGGAATGTTGTTATGTAGATCTGACGGTTCACTAAACGAGCT-3' Plasmid pDCl therefore includes the CMV promoter, a polylinker region, a polyadenylation site from the BGH, and the dhfr gene under control of an SV40 promoter and SV40 splice/polyadenylation sequence. Plasmid pDCl was digested with Xhol, a 4.5 kb fragment lacking CMV promoter and BHG poladenyaltion DNA isolated and ligated to give plasmid pDCil. Plasmid pDCil was then digested with BamHi/Xhol and a 4.5 kb fragment purified (Fragment 8). The 4.5 kb pDCil fragment (Fragment 8) was ligated to a 2tamH_/Sa/I-digested PCR fragment encoding a partial CMV promoter sequence produced using primers 96-13 and 96-14 (plasmid pDCl as template) to give plasmid pDCi2. Primer 96-13 (SEQ ID NO: 24) 5 -AGTTCAGTCGACGGCGCGCCAACCCGGGAATCC GGACGGGATCTATACATTGAATCAATATTGGCA-3 ' Primer 96-14 (SEQ ID NO: 25) ATGTCAGGATCCACGCGGAACTCCATATATGGGCTATGAACT Plasmid pDCi2 was digested with AsplWSpel and a 4.2 kb fragment encoding DHFR with SV40 promoter/operator and polyadenylation sequences purified (Fragment 9) and pDCl was digested with AspllSISpel and a 1.5 kb fragment comprising partial CMV promoter DNA with BGH polyadenylation signals purified (Fragment 10). The 4.2 kb pDCi2 fragment (Fragment 9) was ligated to the 1.5 kb pDCl (Fragment 10) fragment to give plasmid pDC31. Plasmid pDC31 differed from pDCl in that several new restriction sites, including Smαl and Ascl at the 5 ' end of the CMV promoter were generated. Plasmid pDC31 was digested with Notl, the overhanging DΝA blunt-ended using T4 polymerase and the plasmid re-ligated to eliminate the Notl site and give plasmid pDC36. Plasmid pDC36 is the same as pDC31 except that the Notl site was destroyed. Plasmid pDC36 was digested with ApallBamS , overhanging ends filled in, and the plasmid re-ligated to give pDC38. pDC38 is the same as pDC36 except that the Apal/BamΗL fragment containing the bovine growth hormone polyadenylation sequence has been removed. Plasmid pDC38 was digested with Small Hindm and a 4.6 kb fragment lacking the CMV promoter DΝA purified (Fragment 11). Plasmid pSK/EF1.3 was digested with EcoRV/Notl/Pvul and a 2.9 kb fragment encoding the CHEFl promoter and upstream DNA sequences purified (Fragment 12). Bluescript SW + π (pSK + ) was digested with Notl and a 2.9 kb fragment purified (Fragment 13). The 7 kb Notl fragment from Lambda phage 7.4 was ligated to the 2.9 pSK + fragment (Fragment 13) to give plasmid pSK/EFl.7. Plasmid pSK + was digested with Hindm/ Notl and a 2.9 kb fragment purified (Fragment 14). Plasmid pSK/EF1.7 was digested with NotllNcόl and a 620 bp fragment encoding part of the CHEFl 5 ' untranslated intron purified (Fragment 15). A 123 bp H dHI/NcoI-digested PCR fragment encoding the remainder of the 5 ' intron generated with primers 96-36 and 96- 45 and pSK/EF1.12 as template was purified (Fragment 16). Primer 96-36 (SEQ ID NO: 26) GGCTTAGCTCCGAGGAGGG Primer 96-45 (SEQ ID NO: 27) CGTGACAAGCTTGGTTTTCACAACAC The 2.9 kb pSK + fragment (Fragment 14), the 620 bp pSK/EF1.7 fragment (Fragment 15), and the 123 bp HindmiNcόl fragment (Fragment 16) were ligated to give plasmid pSK/5 'EF-l having the complete CΗEF1 5 ' intron sequence. Plasmid pSK/5 'EF-l was digested with Hindm/ Notl and a 0.7 kb fragment encoding the 5 ' intron purified (Fragment 17). The 4.6 kb pDC38 fragment lacking the CMV promoter (Fragment 11), the 2.9 kb pSK/EF1.3 fragment with CΗEF1 promoter and upstream sequences (Fragment 12), and the 0.7 kb pSK/5 'EF-l fragment encoding the complete 5 ' intron (Fragment 17) were combined in a 3-way ligation to give plasmid pDEFl which thus contained the complete 5 ' CHEFl regulatory DNA, the dhfr gene, and SV40 origin of replication which permits replication to a very high copy number in cell lines transformed with the SV40 T antigen. Plasmid pDEFl was digested with Hindm, the overhanging ends filled in, and the plasmid digested with Notl and a 2.6 kb fragment having CHEFl promoter and upstream DΝA sequences in addition to a partial 5 ' intro sequence purified (Fragment 18). Plasmid pDEFl was digested with Notl/AspllS and a 1.3 kb fragment encoding the remainder of the 5 ' intron purified (Fragment 19). Plasmid pDC38 was digested with Small 'AspllS and a 4 kb fragment encoding DHFR with SV40 promoter/ operator and polyadenylation DΝA purified (Fragment 20). The 2.6 kb pDEFl fragment (Fragment 18), the 1.3 kb pDEFl fragment (Fragment 19), and the 4 kb pDC38 fragment (Fragment 20) were combined in a 3 way ligation to give plasmid pDEF2. Plasmid pDEF2 in E. coli strain XL-1 Blue was deposited on March 4, 1997 with the American Type Culture Collection, 12301 Parklawn Drive, Rockville, MD 20852, and assigned Accession Number 98343. Plasmid pDEF2 differs from pDEFl in that the 0.3 kb HindmiSpel fragment 2.3 kb upstream of the CHEFl TATA box was removed and contains only one Hindm site located in the polylinker region. pDEF2 is used in instances where the gene to be expressed includes its own polyadenylation site. Plasmid pDEF2 was digested with AsplWXbάl to linearize the plasmid, but which also eliminated origin of replication sequences and a 7.4 kb fragment purified (Fragment 21). Plasmid pDCl was digested with AsplWXbal and a 0.8 kb fragment including replacement origin or replication DNA in addition to BGH polyadenylation sequences purified (Fragment 22). The 7.4 kb pDEF2 fragment (Fragment 21) and the 0.8 kb pDC21 fragment (Fragment 22) were combined to produce plasmid pDEFlO which differs from pDEFl in the same manner as pDEF2 differs. Plasmid pDEFlO differs from pDEF2 in that there is a polyadenylation site from the bovine growth hormone gene on the 3 ' end of the poly linker region in pDEFlO. Plasmid pDEFlO was digested with HindLUlXbal to linearize the plasmid and an 8.2 kb fragment purified (Fragment 23). Plasmid pDCl/MDC, a plasmid encoding the human chemokine macrophage derived chemokine (MDC), was digested with HindLTUXbal and a 0.4 kb fragment encoding MDC purified (Fragment 24). Ligation of the 8.2 kb pDEFlO fragment (Fragment 23) with the 0.4 kb pDCl/MDC fragment (Fragment 24) produced plasmid pDEFlO/MDC.l . Plasmid pRc/CMV was digested with BamHL, the overhanging ends filled in with Klenow, the plasmid digested with AspllS, and a 1.5 kb fragment purified (Fragment 25). Plasmid pDCl was digested with Notl, the overhanging ends filled in with Klenow, the plasmid digested with Asy 718, and a 3.9 kb fragment purified (Fragment 26). The 1.5 kb pRc/CMV fragment (Fragment 25) was ligated with the 3.9 kb pDCl fragment (Fragment 26) to give plasmid pΝCX. Plasmid pΝCX is similar to the pDCl except that the dhfr gene is replaced with a neomycin resistance (ΝeoR) gene. Plasmid pΝCX was digested with AspllS/Pvul and a 2.1 kb fragment purified (Fragment 27). Plasmid pDEFl was digested with AspllS/Pvul and a 5.9 kb fragment purified (Fragment 28). The 2.1 kb pΝXC fragment (Fragment 27) was ligated to the 5.9 kb pDEFl fragment (Fragment 28) to give plasmid pΝEFl . pΝEFl differs from pDEFl in that the plasmid carries the bacterial neomycin resistance gene (ΝeoR) encoding resistance to neomycin or G418. Genes to be inserted into pΝEFl are generally HindSΩJXbdL fragments inserted following partial Ht ' ndm digestion or 3-way ligations since the plasmid has two H diπ sites. Example 5 Transfection of DG44 cells and Productivity Assay For transfections of host DG44 cells with a single plasmid, 50- 100 μg of plasmid was usually linearized by digestion with restriction enzyme Pvul or Ascl. For transfections wherein two plasmids were to be introduced into CHO cells, the plasmids were left undigested. Prior to transformation plasmids were etiianol precipitated and washed twice with 70% ethanol. DNA pellets were briefly dried and resuspended in 400 μl sterile, distilled water. To the resuspended DNA was added 400 μl of sterile 2X HeBS (40 mM HEPES- NaOH, pH 7.0; 274 mM NaCl; lOmM KCl; 1.4 mM Na^PO,; 12 mM dextrose). Untransfected DG44 cells were cultured in DMEM/F-12 medium supplemented with hypoxanthine (0.01 mM final concentration) and thymidine (0.0016 mM final concentration), also referred to as "HT" . For growth of both untransfected and transfected DG44 cells, dialyzed FBS was added to the medium to a final concentration of 5 to 10% by volume. DG44 cells were prepared for transfection by growing cultures to about 50 % or less confluency in treated 150 cm 2 tissue culture polystyrene flasks (Corning). Cells were removed from the plastic by first aspirating the medium, washing the adherent cells once with calcium-magnesium-free phosphate buffer saline (CMF-PBS: 2.7 mM KCl; 1.5 mM KH 2 PO 4 ; 137 mM NaCl; 8.1 mM Na j HPO , adding 4 ml of a solution containing 0.0125 % irradiated trypsin (Worthington Biochemical Corporation) in CMF-PBS, and incubating at 37 °C for several minutes. Media (4 ml) containing fetal bovine serum (FBS) was added, the cell concentration determined, and aliquots of 2 x 10 7 cells pelleted by centrifugation. Each cell pellet was washed once in CMF-PBS and resuspended in 0.8 ml of a solution containing HeBS with the desired plasmid DNA. The resuspended cells were transferred to a 0.4 cm Gene Pulser cuvette (Bio-Rad) at room temperature and placed in a Bio-Rad GenePulser electroporation apparatus. Cells were electroporated at room temperature with a capacitor discharge of 290 V and 960 μFD (9 to 11.5 msec pulse). Cells were kept in the cuvette for about 10 minutes before they were added to 10 ml DMEM/F-12 supplemented with 5-10% dialyzed FBS and HT. The kill rate was determined at this point (Trypan Blue exclusion) and typically was found to be about 50% . The cells were then pelleted by centrifugation, resuspended in 2 ml DMEM/F- 12 supplemented with 5-10% dialyzed FBS and HT ("non-selective media") and seeded into 10 cm polystyrene tissue culture plates. After two days growth the cells, usually confluent at this point, were removed from the plates using trypsin as described above and seeded into 10 cm 2 plates at varying dilutions in DMEM/F-12 supplemented with 5-10% dialyzed FBS and without HT ("selective media"). Five and nine days later, the cells were fed with selective media. After about two weeks the transfectant colonies (typically more than 1,000 for each transfection) were removed from the plates using trypsin as described above and, after addition of selective media, the cell concentration determined. From each transfection at least two aliquots of 2 x 10 6 cells were added to 10 cm plates containing 10 ml selective media. The cells were grown to extinction, the time at which most of the cells have detached from the plate due to overcrowding. Supernatant from the extinct cultures were assayed by ELISA to determine the average product titer. Example 6 Recombinant Protein Production Using CHEFl DG44 cells described in Example 5 were transfected with plasmids carrying the genes set out in Table 3 operably linked to the CHEFl regulatory DNA. Bacterial strains transformed with plasmids encoding each of the genes utilized in the assays were deposited on April 1, 1997, with the American Type Culture Collection, 12301 Parklawn Drive, Rockville, Maryland 20852 and assigned Accession Numbers as set out in Table 2. Table 2 Accession Numbers for Plasmids Encoded Gene Plasmid Designation _ accession Number Antibody ICM3 Heavy pDEFl/ICM3H.2 98381 Chain Antibody ICM3 Light pNEFl/ICM3L.3 98382 Chain Antibody 23F2G pDEFl/F2GH.l 98383 Heavy Chain Antibody 23F2G Light pNEFl/F2GL. l 98384 Chain Chitinase pDEFl/CTN. l 98385 Platelet Activating pDEF2/HPH.4 98386 Factor Acetyl Hydrolase (PAF-AH) Macrophage Derived pDEFlO/MDC. l 98387 Chemokine (MDC) After selection for transfectants, a pool of colonies (greater than 200) from each transfection was removed from each plate using trypsin and an identical number of cells from each transfection replated and grown to extinction. The supernatants were removed and protein expression assayed either using an ELISA or enzyme assay. The results are shown in Table 3. Table 3 Protein Expression Using CHEFl and CMV Regulatory Sequences Protein Titer Gene Transfected CM CHEFl ICM3 H+L 554 1862 ICM3 H+L 288 2153 Hu23F2G H+L 337 1848 MDC 360 2100 PAF-AH 590 6574 Chitinase-1 3200 2300 Chitinase-2 8900 12850 With the exception of the first experiment examining chitinase expression (designated Chitinase-1 in Table 3), use of the CHEFl regulatory DNA led to significantly higher levels of protein production, with increases ranging from three-fold to eleven-fold higher than expression with the CMV promoter. In order to determine if the decreased expression observed in the assay for chitinase was an anomaly or a repeatable result characteristic of and/or unique to chitinase, the experiment was performed a second time but using two separate transfections, as opposed to the single transfection used in the first experiment which resulted in an unusually low number of transfectants obtained. In addition, a different assay for chitinase activity was employed which was demonstrated to be more precise than the techniques used in the first experiment. Transfections in the second attempt resulted in a number of transfectants more consistent with results previously observed using pDEF2 plasmid which in other experiments produced greater than 150% the number of transfectants with the CMV plasmid. Results from the second experiment (designated Chitinase-2 in Table 3) were internally consistent which lent further credence to the results even though the observed increase in protein expression (approximately 1.4 fold) over expression with the CMV promoter was less than that observed for the other proteins previously examined. Example 7 Recombinant Protein Production Using CHEFl Regulatory DNA of Differing Lengths An expression vector comprising an additional 8 kb of 5 ' flanking DNA from the EF-lα gene was also constructed and designated pDEF14. The plasmid pDEF14 differs from pDEF2 in that pDEF14 contains approximately 11.7 kb of hamster EF-lα 5 ' flanking DNA while pDEF2 contains only 3.3 kb of the same sequences. The pDEF14 plasmid also includes 4 kb of hamster 3 ' flanking DNA adjacent the 3 ' end of the DHFR expression cassette. The larger pDEF14 plasmid was constructed as described below. Briefly, a 2.6 kb AscllNotl CHEFl fragment was removed from pDEF2 and an 11 kb AscllNotl CHEFl fragment inserted in its place. Insertion of the larger sequence first required modifying an Xbal site located 11.7 kb 5 ' to the EF-lα initiating ATG to an Ascl site. In addition, a 4 kb blunt-ended Nsil/Satl fragment, consisting of CHEFl flanking sequence beginning at an Nsil site 118 bp 3 ' to the EF-lα stop codon, was inserted into the PmellSall site 3 ' to the DHFR expression cassette located on the 3 ' end of the polylinker region into which genes to be expressed are inserted. The complete 3 ' DNA sequence, beginning at the stop codon of the EF-l gene, is set out in SEQ ID NO: 28. Bacteria transformed with this plasmid was deposited on April 9, 1997, with the American Type Culture Collection, 12301 Parklawn Drive, Rockville, Maryland 20852 and assigned Accession Numbers 98398. The resulting pDEF14 plasmid includes unique Xbal and Notl sites along with multiple Hindm sites thereby necessitating 3-way ligation to insert a gene into the plasmid for expression. For example, a gene can be inserted into the plasmid by ligating a Hindm/Xbal fragment comprising the desired gene with a 737 bp NotllHindm fragment from pDEF14 and a 19.7 kb XballNotl fragment from pDEF14. Protein expression using this vector was compared against expression using the pDEF2 vector comprising a smaller portion of the EF-l 5 ' flanking region. In preliminary experiments, DNA encoding both the heavy and light chains of the antibody 23F2G was subcloned into both pDEF2 and pDEF14 vectors and expression levels determined following transfection into DG44 cells as described above in Example 5. Genes encoding both antibody chains were arranged linearly in the vectors and expression of both genes was driven by the CHEFl sequence in the individual plasmids. Coding regions for the two chains in each plasmid were separated by identical 4.3 kb of DNA derived from the 3 ' untranslated region human IgG4. Results indicated that 23F2G expression from the larger CHEFl sequence in pDEF14 was four fold greater than antibody expression from the smaller pDEF2 sequence. This result was surprising in that most of the identifiable pDEF14 transcription binding factor sites are also in the DNA sequence in pDEF2. It is therefore possible that one or more additional and unidentified transcription factor binding sites or enhancer sequences are located in the CHEFl DNA in the pDEF14 plasmid. Alternatively, the larger CHEFl DNA may confer the benefit of increased transcription as a result of some property of the 3 ' DNA sequence. Numerous modifications and variations in the invention as set forth in the above illustrative examples are expected to occur to those skilled in the art. Consequently only such limitations as appear in the appended claims should be placed on the invention. SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: Allison, Daniel S. (ii) TITLE OF INVENTION: Hamster EF-lα Regulatory DNA (iii) NUMBER OF SEQUENCES: 29 (iv) CORRESPONDENCE ADDRESS: (A) ADDRESSEE: Marshall, O'Toole, Gerstein, Murray & Borun (B) STREET: 233 South ac er Drive, 6300 Sears Tower (C) CITY: Chicago (D) STATE: Illinois (E) COUNTRY: USA (F) ZIP: 60606 (v) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS (D) SOFTWARE: Patentln Release #1.0, Version #1.30 (vi) CURRENT APPLICATION DATA: (A) APPLICATION NUMBER: US (B) FILING DATE: (C) CLASSIFICATION: (viii) ATTORNEY/AGENT INFORMATION: (A) NAME: Williams Jr., Joseph A. (B) REGISTRATION NUMBER: 38,659 (C) REFERENCE/DOCKET NUMBER: 27866/33537 (ix) TELECOMMUNICATION INFORMATION: (A) TELEPHONE: 312-474-6300 (B) TELEFAX: 312-474-0448 (2) INFORMATION FOR SEQ ID NO:l: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 3678 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 1 : ACTAGTTCCA AAGATGAATT ACTAACCAGT GTTTCCAAGG AAATAAATGA AAGCAGAGAG 60 ATTAGTTCTA TTGCTAGTGT TTCATTTTCG TATATTTCTT ACAATTTCTC TTGTTACAAA 120 TAGGCACTAG GGTATCAAGA TAATTTTAAC GACTGGCTGA GAACCCTAGA AAATCTCTGT 180 GAAAAAGGGA TTTGTGAAAT GAGAGAGGGT AATGTGGCCA TTATAGAAAA GGCTTTTGTG 240 TGCCTTGCAT GCATAGACCC TGTGTTTGAT CTCTTAACAC CCTCCTTGAC CAGAAAAAGC 300 TTCTGTGGAT AGAAAATGAT TAGTTATATA TACTTTTAGG GAAACGTAGT TCTGGATTCT 360 TTGGTTACAA TTAACAGAAT TAAGTGCAAA CAAAGCCAGA AACCTCCTGA TAAATGAGAA 420 AACCTGCTTG TAGAAGGTTG TAAGGCTCTG TAATATAGGA ATTAGGAGAA AAGAAACCTG 480 TGTGGTGGGG CACGTCTGTA ATCCCAGCAT TGGGAAGTAG AGGTAGAAGA TTAGAAATCA 540 AAGGCCAGCC TCAGCAACAC AGTGAGTTTG AGGCCACCCT GAACTACATC AGGTTCTGTC 600 TCCTTTCTTT TTTTTTTTTT TTTCTTTTCT TTTTTTGGTT TCTCTGTGTA GTTTTGGAGC 660 CTATCCTGGC ACTAGCTCTG AAGAGCAGGC TGGCCTCGAA CTCAGAGATC AGCCAGCCTC 720 TGCTGGGATT AAAGGTATGC ACCACCAACG CCCCAGGTTT TGTCTCAAAC AAACAAAAAT 780 AACATCAGGA GGTGGTGAGA GGGCTCAGTG GTCACAGGCA TTCTCTGCAA AGCCTGACTC 840 TGAGTTGGAT CCTTTAGAGC TACATGGTTG AGGGAAGAGA ACTGACTCCT GGAAGGTGTC 900 CTCTGGTCCC CACACATAGC TATACACAGC ATGTGCATTC ACACACACTA AATAATGCTA 960 TTTTTAAAAA AATTAAAAAC AACAACAGTT TGGGTTGTGA AAACTAGAAC TAGATAATAG 1020 GTAAGAATCA AGTATCATGT AAATTTGCTT TCAACTCATC CCAAAATTTG TTTTATATTT 1080 CAGTTTTTTT CCTTCCTAGC TTGACTGTGG AGTCTTGTCC GGAAGCAAAT AGTTCCTTTG 1140 CAGATCCCAC ATGTGGACAC CGGACAGTAG GTCCTCAAAT GCTCCTTATT AGGTTGGTTC 1200 AATAATATCA ATTGTTTGTT ACTAGGCAGT GATGTTGTAC ATCTGGAGGA GATCTCTTGA 1260 GCCCATAATC AGGTTATTAG GAATAAATAC TCTAAGGCTA AAAATGTAGC TTAGTGATAA 1320 GAGTGCTTGC CTGGTGTGCT GAGACCCTCG GTTCCATCTC CACAACCCCA TATTCCATTA 1380 CAAAATACCT TTTCACCGTC CCTAGCATTA AGAAACAAAA CAACAAAGAA GTTTTTCTTT 1440 CTTCTGAGAT CCTGCCCGGA GAGGCATTTA AAACTGGCCA GGGCCAAAAA AAAAAAAAAA 1500 AAAAGAAAAA AAAGAAAAGA AAACAGGCTA GGGCCGGCAT GGTGGCGCAC GCCTTTAATC 1560 CCAGCACGCA GGAGGCAGAG GCAGGGCGGA TCTCTGTGAG TTTGAGGTCA GCCTGGTCTA 1620 CCTAGTGAGT TTCAGGGCAC CCAGGGCTAA AGAGACTGTC TCAAAAACAA AACAGCCACA 1680 CAATCAGAAC CACAGCAAAA CGCAGTTATG ATCCTTGGAA CTGTAGGAAT GACAAGCATT 1740 TAAATAATAG GACGAGCCAT TTTTGAGAAG CTCTGATTTC ACAAGTGTCA GGGATGGGCT 1800 CTGGGCGAGT AAGATTGCTA ATGCTGGCCT CTAAATGAGA CCACGTGGAG TTGATTAGAT 1860 TCTTTTCATG TTCCTCGTGC TCTATCAAAT AACTGTACCC AAATACACAC ACACACACAC 1920 ACACACACAA TGCGCGCACA CACAAAATCC TTTTTTAGCT TAAGAAGCCC AGAATCAGAA 1980 GTAAAGCTAA CTGTGGGACT TAAGTATTAT TCTGAACGGA ACTCCCAGGG CGTGAAGCGC 2040 GCTTCAGGCT TCCAGAGAAG CAGCTGGCGC TGGATGGAAT GAACCAAGAG GCCAGCACAG 2100 GGGCAGATCC GTCGAGCTCT CGGCCACCGA GCTGAGCCCT TAGGTTCTGG GGCTGGGAAG 2160 GGTCCCTAGG ATTGTGCACC TCTCCCGCGG GGGACAAGCA GGGGATGGCG GGGCTGACGT 2220 CGGGAGGTGG CCTCCACGGG AAGGGACACC CGGATCTCGA CACAGCCTTG GCAGTGGAGT 2280 CAGGAAGGGT AGGACAGATT CTGGACGCCC TCTTGGCCAG TCCTCACCGC CCCACCCCCG 2340 ATGGAGCCGA GAGTAATTCA TACAAAAGGA GGGATCGCCT TCGCCCCTGG GAATCCCAGG 2400 GACCGTCGCT AAATTCTGGC CGGCCTCCCA GCCCGGAACC GCTGTGCCCG CCCAGCGCGG 2460 CGGGAGGAGC CTGCGCCTAG GGCGGATCGC GGGTCGGCGG GAGAGCACAA GCCCACAGTC 2520 CCCGGCGGTG GGGGAGGGGC GCGCTGAGCG GGGGCCCGGG AGCCAGCGCG GGGCAAACTG 2580 GGAAAGTGGT GTCGTGTGCT GGCTCCGCCC TCTTCCCGAG GGTGGGGGAG AACGGTATAA 2640 AAGTGCGGTA GTCGCGTTGG ACGTTCTTTT TCGCAACGGG TTTGCCGTCA GAACGCAGGT 2700 GAGTGGCGGG TGTGGCCTCC GCGGGCCCGG GCTCCCTCCT TTGAGCGGGG TCGGACCGCC 2760 GTGCGGGTGT CGTCGGCCGG GCTTCTCTGC GAGCGTTCCC GCCCTGGATG GCGGGCTGTG 2820 CGGGAGGGCG AGGGGGGGAG GCCTGGCGGC GGCCCCGGAG CCTCGCCTCG TGTCGGGCGT 2880 GAGGCCTAGC GTGGCTTCCG CCCCGCCGCG TGCCACCGCG GCCGCGCTTT GCTGTCTGCC 2940 CGGCTGCCCT CGATTGCCTG CCCGCGGCCC GGGCCAACAA AGGGAGGGCG TGGAGCTGGC 3000 TGGTAGGGAG CCCCGTAGTC CGCATGTCGG GCAGGGAGAG CGGCAGCAGT CGGGGGGGGG 3060 ACCGGGCCCG CCCGTCCCGC AGCACATGTC CGACGCCGCC TGGACGGGTA GCGGCCTGTG 3120 TCCTGATAAG GCGGCCGGGC GGTGGGTTTT AGATGCCGGG TTCAGGTGGC CCCGGGTCCC 3180 GGCCCGGTCT GGCCAGTACC CCGTAGTGGC TTAGCTCCGA GGAGGGCGAG CCCGCCCGCC 3240 CGGCACCAGT TGCGTGCGCG GAAAGATGGC CGCTCCCGGG CCCTGTAGCA AGGAGCTCAA 3300 AATGGAGGAC GCGGCAGCCC GGCGGAGCGG GGCGGGTGAG TCACCCACAC AAAGGAAGAG 3360 GGCCTTGCCC CTCGCCGGCC GCTGCTTCCT GTGACCCCGT GGTGTACCGG CCGCACTTCA 3420 GTCACCCCGG GCGCTCTTTC GGAGCACCGC TGGCCTCCGC TGGGGGAGGG GATCTGTCTA 3480 ATGGCGTTGG AGTTTGCTCA CATTTGGTGG GTGGAGACTG TAGCCAGGCC AGCCTGGCCA 3540 TGGAAGTAAT TCTTGGAATT TGCCCATTTT GAGTTTGGAG CGAAGCTGAT TGACAAAGCT 3600 GCTTAGCCGT TCAAAGGTAT TCTTCGAACT TTTTTTTTAA GGTGTTGTGA AAACCACCGC 3660 TAATTCAAAT CCAACATG 3678 (2) INFORMATION FOR SEQ ID NO: 2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 2: AGGCACAGTC GAGGCTGATC 20 (2) INFORMATION FOR SEQ ID NO: 3: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 3: TTCCAGGGTC AAGGAAGGCA 20 (2) INFORMATION FOR SEQ ID NO:4: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 4: GCCACCTGAT CTACAAATGT 20 (2) INFORMATION FOR SEQ ID NO : 5 : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 5: GAGATACCAG CCTCAAATTC 20 (2) INFORMATION FOR SEQ ID NO: 6: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 6 : ATGTGACCAT CATTGATGCC 20 (2) INFORMATION FOR SEQ ID NO: 7: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 7 : GTGACTTTCC ATCCCTTGAA 20 (2) INFORMATION FOR SEQ ID NO: 8: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 8: GTTGGAATGG TGACAACATG 20 (2) INFORMATION FOR SEQ ID NO: 9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 9: CAGGTTTTAA AACACCAGTC 20 (2) INFORMATION FOR SEQ ID NO: 10: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 10: AATGACCCAC CAATGGAAGC 20 (2) INFORMATION FOR SEQ ID NO: 11: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 11: ACAGCAACTG TCTGCCTCAT 20 (2) INFORMATION FOR SEQ ID NO:12: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 17 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 12: GTAAAACGAC GGCCAGT 17 (2) INFORMATION FOR SEQ ID NO: 13: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 19 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 13: GGAAACAGCT ATGACCATG 19 (2) INFORMATION FOR SEQ ID NO:14: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 14: AATTAACCCT CACTAAAGGG 20 (2) INFORMATION FOR SEQ ID NO:15: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 23 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 15: GTTAATACGA CTCACTATAG GGC 23 (2) INFORMATION FOR SEQ ID NO: 16: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 6 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 16: GGCGGG (2) INFORMATION FOR SEQ ID NO:17: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 6 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 17: GGGCGG (2) INFORMATION FOR SEQ ID NO: 18: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 8 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:18: TGACGYMR (2) INFORMATION FOR SEQ ID NO: 19: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 13 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 19: TGGCNNNNNKCCR 13 (2) INFORMATION FOR SEQ ID NO: 20: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 26 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 20: GATCGCGGCC GCGTTTAAAC GGATCC 26 (2) INFORMATION FOR SEQ ID NO: 21: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 26 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 21: AATTGGATCC GTTTAAACGC GGCCGC 26 (2) INFORMATION FOR SEQ ID NO:22: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 77 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:22: CGTTTAGTGA ACCGTCAGAT CTACATAACA ACATTCCTCC TCTAAAGAAG CCCCAAGCTT 60 GATATCTGCA GAATTCT 77 (2) INFORMATION FOR SEQ ID NO:23: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 85 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23: CTAGAGAATT CTGCAGATAT CAAGCTTGGG GCTTCTTTAG AGGAGGAATG TTGTTATGTA 60 GATCTGACGG TTCACTAAAC GAGCT 85 (2) INFORMATION FOR SEQ ID NO: 24: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 66 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 24: AGTTCAGTCG ACGGCGCGCC AACCCGGGAA TCCGGACGGG ATCTATACAT TGAATCAATA 60 TTGGCA 66 (2) INFORMATION FOR SEQ ID NO:25: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 42 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 25: ATGTCAGGAT CCACGCGGAA CTCCATATAT GGGCTATGAA CT 42 (2) INFORMATION FOR SEQ ID NO: 26: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 19 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:26: GGCTTAGCTC CGAGGAGGG 19 (2) INFORMATION FOR SEQ ID NO: 27: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 26 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:27: CGTGACAAGC TTGGTTTTCA CAACAC 26 (2) INFORMATION FOR SEQ ID NO: 28: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 4263 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:28: TGAATATTAC CCCTAACACC TGCCACCCCA GTCTTAATCA GTGGTGGAAG AACGGTCTCA 60 GAACTGTTTG TCTCAATTGG CCATTTAAGT TTAATAGTGA AAGACTGGTT AATGATAACA 120 ATGCATCGGA AAACCTTCAG GAGGAAAGGA GAATGTTTTG TGGAACATTT TTGTGTGTGT 180 GGCAGTTTTA AGTTATTAGT TTTCAAAATC AGTACTTTTT AATGGAAACA ACTTGACCAA 240 AAATCTGTCA CAGAATTTTG AGACCCATTA AAATACAAGT TTAATGAGAA GTCTGTCTCT 300 GTTAATGCTG AAGTCATTAC TAAGTGCTTA GCTTAGCAAG GTATGTGGAT GCCCATTTGT 360 GTTCCAAGGG ATTGGACTGT TCATCAGGAC CCAGAGCTGA GTTTCAAGGG CTCAAGAGAT 420 GGCTTATTAC CTGTGGGTGT CTTGAAGGTT CTGGTTGGGA CAAATTAGGA ATGTTTTTGG 480 CAGACATGGT GACTACCTTC ATCTGGGTGA GTTCAGTTGA TTTGTCTTGA GCCTTTGGGG 540 TTTACACAAG TAAATGACAT CATACAGTTA GTGTATTGTT AGTGAATATT AATATATGAG 600 GCAGGCTTTG CTCTAGCAAT TTTAGAACTA GTTTTCAGGA AAGGGTTCAT CTTGTGCATT 660 GGATGTTTGA TTCTATCACT TAGAGTTTAA ACTGAAAGTG CTCAAGAGGT TTTATTTAGG 720 CTGGGATATA AATAAGCCTT TCTGTAGCTT GTAATGGTAT CAGGAATTTA AAAGGCCATC 780 TGGGGCACAA AGATTAAGCA GAAAAGGTAG AAGGTGAGAT TGGGGGACTT TGAGTACTTC 840 ACACACTTTA ATGTGTGAGT GCTTTAGTGC ATATAGTACA ACTGCCAGAT AAGGGCATCC 900 ACATCTGATT GTTTGGAAGG CACCTTGTGG TTTCTGGGAA TTCAGAATTG GGAGAAAAAT 960 GCTCCCAACC GCTGAAGCCC TTGGTAATCT GCAGGGTGTT TATTTAGCAG GAGATAAGGA 1020 CAAAAAGTTA TAGTGTGGAG TTGGTTGAGT TGGTAGATGT CATTACAACA GGTGGTCTTA 1080 AATTGGGTTA GGAGTCACTT TGAAATACCT GGGCCATAAG CAAAGTGGCA TTTTCACCTT 1140 TCAGGAGAAA CTGGTACACT TATCCATTCT ATAGTGCATG CTTGTTCAAT TGGGCTGATG 1200 ACTAAACCGG TGACTAAAGG TTTGTCAGTA TAAATGGATG GGTTGTAGGC AGACGGTGAG 1260 GAATTACTAT ACCTGCAAGG AGTCATTGCC TGATCTGCCT GGAAAGGGGC AGGATTGAGT 1320 CTCAGAACGT GTACACCATA GGATATGGAA AAATTTGTCA CGCCTAGCAT TCAACTTAGT 1380 GGTGTAGCGC CACCTACTGG CACTTTAAAA GCTTAGCATA GAGGAGCATG TGTGTTAGGA 1440 GCTCGGATGG GATCCAGGGC CTCAAGGTTT GCATGTAAAT AAAAGCCCTT TACCAAATTA 1500 ACTACATACC AGCATACATC AGTCCTTTAG TGTTGAAAAA CAGAAGGGAA AGCTAATATA 1560 TATAGTGCTT GCTTTATTTA AGTCTAGCTG ATTACGTGTT TGGTTGCCAG TGTGACTAGT 1620 CTGGAGTTGA ATTTGTCCTC AGACACGTAA AATGGAATTT GGGATTCACA ACACTCTAGT 1680 ATGAGGGACC TAATGGCCTG TACCAGGCAC AAACGTGTCT ATAAACTACA CAAAACGAAG 1740 GAATTTACAG GAATTAGGAA GGTATTCTTA ACATTAAAAC ATTATGGGCA TTTTAAAAAA 1800 AGCTTTGACA GGATTTCTTT GTCATGGCTG TCCTGGAGCT AGTTGTGTAG ACCAGGCTGG 1860 GCTGAAATCT TGTCTGCCTG CCTGGCTTGG ACACTTTTTT ATTATGTATA CAACATTCTG 1920 CTTCCATGTA TATCTGCACA TTAGAAGACG GCACCAGATC TCCTAATGGA TGGTTGTGAG 1980 CCACCATGTG GTTGCTGGGA ATTGAACTCA GGACCTCTGG AAGAGCAGTG CTCTTAACCT 2040 CTGAGCCATC TCCAGCCCCA GCTTGGGCAC ATTTTTAATG GCTGGGAAAT CAAACCCCCT 2100 AGGCCTTCTG TCAGTAATGA AGGGCTTTTG GCTACCGAGA GTAGGATTTA AGGTTATTCG 2160 GAGCTGCAGG TCTGCCTCAG TGCAGGTTTG GGAGTCCAGC ATCTTAGAAA ATGCAGTGAA 2220 GCCAAGCTGA GCTATATTTT GTTTAAAAAA AAAATAAGTG GGTAAAGTGC TGCTGAGCCT 2280 GATGACCAAG CTGGGACACA AGTAGAAGAA CATAGGCCAA TGCTCTATAT TAAAAGCATG 2340 GGTCATTTTT AATGCTCTTG AGAAGGCTAT GCCTACACTA CTCTCAGCCA CCGCAGCGTG 2400 TTTAAATTAA ACTAGTTTGG AAATTTTCTT TGGGGGTAAG CTATTTAACC TAGTGCCTTG 2460 GCAGGTATAC TACTGAACTC TCCTCCTCAT TCCTTTTTGT TTTTTAAGAA TTTCAGTCAG 2520 GCTCAGGCAG CCCTTAAACT TGTGATTAAG CCTGAGAACA GTTACGATTA TGAGCCTATT 2580 AGTATACCGA TCAATATGTG AATTTTTTTG GGATGGGGGT CAGGCCTCCC TGCCTCCCAA 2640 ATACTGGGAC TAAAGGCTGC ACCACCACAA CCTGGCTCTT GAAATACTTT TCTACATTTT 2700 TTGGGGGGCA TGGGTGGGAG AGCAGGGTTT CTCTGTATTA GCCCTGGCTC TCCTGGAACT 2760 CTGTAGACCA GGCTATTCTT GAGCTCAGAT TAGCCTGTCT CTGCCTCCTA AATTCTGGGA 2820 TTAAAGGTGT GTGCTACTGC TGCCTGGCTA CAAAGACATT TTTTTTTTTC TTAAATTTAA 2880 AAACAAAAGT GGTTCTTTTA GAAGGGTGGT TGGTGTTGGC ACATACTCCA AGCACTCAGG 2940 TTTTGAGTTT GTCCCAGGAA TGAAGACTGC ATTACTGCCG CCCCTCCCTG GTAAGGGCTA 3000 CACAGAGAAA TCCTATTTGG AGCCTATCCT GGTAACTCGC TCTGTAGACC AGGCTGGCCT 3060 CGAACTCAAG AGAACCACCT GCCTCTGAAT GCTGGTATTA AGGGCAGGCA CCACCAACAC 3120 CCAGCCTAAA AAATGTCTTT TTTTTAAAGA TTTTTTTTTT TTTTTTTACA GAATAAACAT 3180 TCTGTTTACA ATATTCTGCT TCTATGTATA TCTGCACACT AGAAGAGGGC ACCCGATCTC 3240 ATAATGGATG GTTGTGAGCC ACCAAGTGGT TGCTGGGAAT TGAACTCAGA ACCTCTGGAA 3300 GAGCAGTCAG TGCTCTTAAC CTCTGAGCCA TCTCTCCAGC CCCTAAAAAT GGCTCTTGAG 3360 ATAGGGTCTC AAGTAGTTTG AGACTGAGTT GGCTATATAA ACAAGGCTGG CACATAGCAC 3420 CATGTACAGC TGGGTTTAGT TTACATGGGG TGTTTTTGTC TCTGGAGGCA GGAGGATCAT 3480 TTGAGCATAG GGAGTTAATA GTGAGGTCAT GTTTTATCTA CTCTTCTGAA TTGAGAACTA 3540 AGCTGATGCA AAGCAAGTTT GACTGAAGAA GTCCAGTTTA TGAGAACAAG GGTGGAAACT 3600 AATGTGTCAA AGATGGCCTT GCATGTGTTT TAGATGATGA CCCAGTCACT TGGGAATTAC 3660 TGGATGTGTA AGACCTATAT CTTGACAGGA GTGAACAGTG TCTTATAGGT CCTATATGAA 3720 AGAAATGAGA CATACCCATT TTGTTTCCCC TAAGAATTCA CTTTTCCTAA CCTGGTTCAT 3780 GCTATTTAGG TTATTTTACT TGCAAATCCT AGGTGCTCCC TTACCCAGTA TTGCTTATGT 3840 GGCACCAAAG TCACTCACTC CCATGATTTG CAAGTCTCTG GGAACTTCCA TGACAACCTA 3900 GAATAGCAAC TCAAATACAT TTTCTCAGTA CCAATTTTGA AGAAAAAATA TTTTGCAAAA 3960 TAGCTGTATG GATGGGTACT AAATAGTGAG GTTATCTCCA GAAGGCCTAT GAAGAATTAA 4020 GGTTGAGTTC AGTTGAGTTC AGCAGCAAGT TTAAGGTTCA TCCATTTTTG TACAGTGTTT 4080 TCCTATTACG GTAAGTGTTT TGCCTGCAGG AATATCTGTA CCACATGCTT GCCTGGTACC 4140 TATATCGGCC AGAAGAGGGC TTTGGATCCT CTGGACTTGA ATTACAGATG GGTATTAGCC 4200 ACCATTTAGG TGCTGGGAAT TGAAACCAAG TCCTCTGGAA GAACAGCAAG TGATCGAGTC 4260 GAC 4263 (2) INFORMATION FOR SEQ ID NO:29: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 4695 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 29: CCCGGGCTGG GCTGAGACCC GCAGAGGAAG ACGCTCTAGG GATTTGTCCC GGACTAGCGA 60 GATGGCAAGG CTGAGGACGG GAGGCTGATT GAGAGGCGAA GGTACACCCT AATCTCAATA 120 CAACCTTTGG AGCTAAGCCA GCAATGGTAG AGGGAAGATT CTGCACGTCC CTTCCAGGCG 180 GCCTCCCCGT CACCACCCCC CCCAACCCGC CCCGACCGGA GCTGAGAGTA ATTCATACAA 240 AAGGACTCGC CCCTGCCTTG GGGAATCCCA GGGACCGTCG TTAAACTCCC ACTAACGTAG 300 AACCCAGAGA TCGCTGCGTT CCCGCCCCCT CACCCGCCCG CTCTCGTCAT CACTGAGGTG 360 GAGAAGAGCA TGCGTGAGGC TCCGGTGCCC GTCAGTGGGC AGAGCGCACA TCGCCCACAG 420 TCCCCGAGAA GTTGGGGGGA GGGGTCGGCA ATTGAACCGG TGCCTAGAGA AGGTGGCGCG 480 GGGTAAACTG GGAAAGTGAT GTCGTGTACT GGCTCCGCCT TTTTCCCGAG GGTGGGGGAG 540 AACCGTATAT AAGTGCAGTA GTCGCCGTGA ACGTTCTTTT TCGCAACGGG TTTGCCGCCA 600 GAACACAGGT AAGTGCCGTG TGTGGTTCCC GCGGGCCTGG CCTCTTTACG GGTTATGGCC 660 CTTGCGTGCC TTGAATTACT TCCACGCCCC TGGCTGCAGT ACGTGATTCT TGATCCCGAG 720 CTTCGGGTTG GAAGTGGGTG GGAGAGTTCG AGGCCTTGCG CTTAAGGAGC CCCTTCGCCT 780 CGTGCTTGAG TTGAGGCCTG GCCTGGGCGC TGGGGCCGCC GCGTGCGAAT CTGGTGGCAC 840 CTTCGCGCCT GTCTCGCTGC TTTCGATAAG TCTCTAGCCA TTTAAAATTT TTGATGACCT 900 GCTGCGACGC TTTTTTTCTG GCAAGATAGT CTTGTAAATG CGGGCCAAGA TCTGCACACT 960 GGTATTTCGG TTTTTGGGGC CGCGGGCGGC GACGGGGCCC GTGCGTCCCA GCGCACATGT 1020 TCGGCGAGGC GGGGCCTGCG AGCGCGGCCA CCGAGAATCG GACGGGGGTA GTCTCAAGCT 1080 GGCCGGCCTG CTCTGGTGCC TGGCCTCGCG CCGCCGTGTA TCGCCCCGCC CTGGGCGGCA 1140 AGGCTGGCCC GGTCGGCACC AGTTGCGTGA GCGGAAAGAT GGCCGCTTCC CGGCCCTGCT 1200 GCAGGGAGCT CAAAATGGAG GACGCGGCGC TCGGGAGAGC GGGCGGGTGA GTCACCCACA 1260 CAAAGGAAAA GGGCCTTTCC GTCCTCAGCC GTCGCTTCAT GTGACTCCAC GGAGTACCGG 1320 GCGCCGTCCA GGCACCTCGA TTAGTTCTCG AGCTTTTGGA GTACGTCGTC TTTAGGTTGG 1380 GGGGAGGGGT TTTATGCGAT GGAGTTTCCC CACACTGAGT GGGTGGAGAC TGAAGTTAGG 1440 CCAGCTTGGC ACTTGATGTA ATTCTCCTTG GAATTTGCCC TTTTTGAGTT TGGATCTTGG 1500 TTCATTCTCA AGCCTCAGAC AGTGGTTCAA AGTTTTTTTC TTCCATTTCA GGTGTCGTGA 1560 AAACTACCCC TAAAAGCCAA AATGGGAAAG GAAAAGACTC ATATCAACAT TGTCGTCATT 1620 GGACACGTAG ATTCGGGCAA GTCCACCACT ACTGGCCATC TGATCTATAA ATGCGGTGGC 1680 ATCGACAAAA GAACCATTGA AAAATTTGAG AAGGAGGCTG CTGAGGTATG TTTAATACCA 1740 GAAAGGGAAA GATCAACTAA AATGAGTTTT ACCAGCAGAA TCATTAGGTG ATTTCCCCAG 1800 AACTAGTGAG TGGTTTAGAT CTGAATGCTA ATAGTTAAGA CCTTACTTAT GAAATAATTT 1860 TGCTTTTGGT GACTTCTGTA ATCGTATTGC TAGTGAGTAG ATTTGGATGT TAATAGTTAA 1920 GATCCTACTT ATAAAAGTTT GATTTTTGGT TGCTTCTGTA ACCCAAAGTG ACCAAAATCA 1980 CTTTGGACTT GGAGTTGTAA AGTGGAAACT GCCAATTAAG GGCTGGGGAC AAGGAAATTG 2040 AAGCTGGAGT TTGTGTTTTA GTAACCAAGT AACGACTCTT AATCCTTACA GATGGGAAAG 2100 GGCTCCTTCA AGTATGCCTG GGTCTTGGAT AAACTGAAAG CTGAGCGTGA ACGTGGTATC 2160 ACCATTGATA TCTCCTTGTG GAAATTTGAG ACCAGCAAGT ACTATGTGAC TATCATTGAT 2220 GCCCCAGGAC ACAGAGACTT TATCAAAAAC ATGATTACAG GGACATCTCA GGTTGGGATT 2280 AATAATTCTA GGTTTCTTTA TCCCAAAAGG CTTGCTTTGT ACACTGGTTT TGTCATTTGG 2340 AGAGTTGACA GGGATATGTC TTTGCTTTCT TTAAAGGCTG ACTGTGCTGT CCTGATTGTT 2400 GCTGCTGGTG TTGGTGAATT TGAAGCTGGT ATCTCCAAGA ATGGGCAGAC CCGAGAGCAT 2460 GCCCTTCTGG CTTACACACT GGGTGTGAAA CAACTAATTG TCGGTGTTAA CAAAATGGAT 2520 TCCACTGAGC CACCCTACAG CCAGAAGAGA TATGAGGAAA TTGTTAAGGA AGTCAGCACT 2580 TACATTAAGA AAATTGGCTA CAACCCCGAC ACAGTAGCAT TTGTGCCAAT TTCTGGTTGG 2640 AATGGTGACA ACATGCTGGA GCCAAGTGCT AACGTAAGTG GCTTTCAAGA CCATTGTTAA 2700 AAAGCTCTGG GAATGGCGAT TTCATGCTTA CACAAATTGG CATGCTTGTG TTTCAGATGC 2760 CTTGGTTCAA GGGATGGAAA GTCACCCGTA AGGATGGCAA TGCCAGTGGA ACCACGCTGC 2820 TTGAGGCTCT GGACTGCATC CTACCACCAA CTCGTCCAAC TGACAAGCCC TTGCGCCTGC 2880 CTCTCCAGGA TGTCTACAAA ATTGGTGGTA AGTTGGCTGT AAACAAAGTT GAATTTGAGT 2940 TGATAGAGTA CTGTCTGCCT TCATAGGTAT TTAGTATGCT GTAAATATTT TTAGGTATTG 3000 GTACTGTTCC TGTTGGCCGA GTGGAGACTG GTGTTCTCAA ACCCGGTATG GTGGTCACCT 3060 TTGCTCCAGT CAACGTTACA ACGGAAGTAA AATCTGTCGA AATGCACCAT GAAGCTTTGA 3120 GTGAAGCTCT TCCTGGGGAC AATGTGGGCT TCAATGTCAA GAATGTGTCT GTCAAGGATG 3180 TTCGTCGTGG CAACGTTGCT GGTGACAGCA AAAATGACCC ACCAATGGAA GCAGCTGGCT 3240 TCACTGCTCA GGTAACAATT TAAAGTAACA TTAACTTATT GCAGAGGCTA AAGTCATTTG 3300 AGACTTTGGA TTTGCACTGA ATGCAAATCT TTTTTCCAAG GTGATTATCC TGAACCATCC 3360 AGGCCAAATA AGCGCCGGCT ATGCCCCTGT ATTGGATTGC CACACGGCTC ACATTGCATG 3420 CAAGTTTGCT GAGCTGAAGG AAAAGATTGA TCGCCGTTCT GGTAAAAAGC TGGAAGATGG 3480 CCCTAAATTC TTGAAGTCTG GTGATGCTGC CATTGTTGAT ATGGTTCCTG GCAAGCCCAT 3540 GTGTGTTGAG AGCTTCTCAG ACTATCCACC TTTGGGTAAG GATGACTACT TAAATGTAAA 3600 AAAGTTGTGT TAAAGATGAA AAATACAACT GAACAGTACT TTGGGTAATA ATTAACTTTT 3660 TTTTTAATAG GTCGCTTTGC TGTTCGTGAT ATGAGACAGA CAGTTGCGGT GGGTGTCATC 3720 AAAGCAGTGG ACAAGAAGGC TGCTGGAGCT GGCAAGGTCA CCAAGTCTGC CCAGAAAGCT 3780 CAGAAGGCTA AATGAATATT ATCCCTAATA CCTGCCACCC CACTCTTAAT CAGTGGTGGA 3840 AGAACGGTCT CAGAACTGTT TGTTTCAATT GGCCATTTAA GTTTAGTAGT AAAAGACTGG 3900 TTAATGATAA CAATGCATCG TAAAACCTTC AGAAGGAAAG GAGAATGTTT TGTGGACCAC 3960 TTTGGTTTTC TTTTTTGCGT GTGGCAGTTT TAAGTTATTA GTTTTTAAAA TCAGTACTTT 4020 TTAATGGAAA CAACTTGACC AAAAATTTGT CACAGAATTT TGAGACCCAT TAAAAAAGTT 4080 AAATGAGAAA CCTGTGTGTT CCTTTGGTCA ACACCGAGAC ATTTAGGTGA AAGACATCTA 4140 ATTCTGGTTT TACGAATCTG GAAACTTCTT GAAAATGTAA TTCTTGAGTT AACACTTCTG 4200 GGTGGAGAAT AGGGTTGTTT TCCCCCCACA TAATTGGAAG GGGAAGGAAT ATCATTTAAA 4260 GCTATGGGAG GGTTTCTTTG ATTACAACAC TGGAGAGAAA TGCAGCATGT TGCTGATTGC 4320 CTGTCACTAA AACAGGCCAA AAACTGAGTC CTTGGGTTGC ATAGAAAGCT TCATGTTGCT 4380 AAACCAATGT TAAGTGAATC TTTGGAAACA AAATGTTTCC AAATTACTGG GATGTGCATG 4440 TTGAAACGTG GGTTAAAATG ACTGGGCAGT GAAAGTTGAC TATTTGCCAT GACATAAGAA 4500 ATAAGTGTAG TGGCTAGTGT ACACCCTATG AGTGGAAGGG TCCATTTTGA AGTCAGTGGA 4560 GTAAGCTTTA TGCCATTTTG ATGGTTTCAC AAGTTCTATT GAGTGCTATT CAGAATAGGA 4620 ACAAGGTTCT AATAGAAAAA GATGGCAATT TGAAGTAGCT ATAAAATTAG ACTAATTACA 4680 TTGCTTTTCT CCGAC 4695

Claims: What is claimed is: 1. A purified and isolated DNA comprising the hamster EF-lα transcriptional regulatory DNA. 2. The DNA according to claim 1 wherein said regulatory DNA comprises the nucleic acid sequence shown in SEQ ID NO: 1. 3. The DNA according to claim 1 wherein the regulatory DNA comprises a portion of a nucleic acid sequence shown in SEQ ID NO: 1 which is capable of promoting transcription of a gene operatively linked to the regulatory DNA. 4. The DNA according to claim 3 wherein the regulatory DNA comprises from about nucleotide 2114 to about nucleotide 3656 in the nucleotide shown in SEQ ID NO: 1. 5. A host cell comprising the DNA according to any one of claims 1 through 4 wherein said DNA is not operatively linked to EF-l coding sequences. 6. A vector comprising the DNA according to any one of claims 1 through 4 wherein said DNA is not operatively linked to EF-lα coding sequences. 7. A host cell transformed or transfected with the vector according to claim 6. 8. A chimeric polynucleotide comprising the hamster EF-lα regulatory DNA operatively linked to a protein coding DNA sequence, said DNA sequence encoding a protein other than hamster EF-lα. 9. The chimeric polynucleotide according to claim 8 wherein the regulatory DNA comprises the nucleic acid sequence shown in SEQ ID NO: 1. 10. The chimeric polynucleotide according to claim 8 wherein the regulatory DNA comprises a portion of a nucleic acid sequence shown in SEQ ID NO: 1 , wherein the portion is capable of promoting transcription of a gene operatively linked to the regulatory DNA. 11. The chimeric polynucleotide according to claim 10 wherein the regulatory DNA comprises from about nucleotide 2114 to about nucleotide 3656 in the nucleotide shown in SEQ ID NO: 1. 12. The chimeric polynucleotide according to claim 8 wherein said protein coding DNA sequence encodes a protein endogenous to hamster cells other than EF-lα. 13. The chimeric polynucleotide according to claim 8 wherein the DNA sequence encodes a protein heterologous to hamster cells. 14. A host cell transformed or transfected with the chimeric polynucleotide according to any one of claims 8 through 13. 15. An expression plasmid comprising the chimeric polynucleotide according to any one of claims 8 through 13. 16. The expression plasmid according to claim 15 further comprising the nucleic acid sequence set out in SEQ ID NO: 28. 17. The expression plasmid according to claim 16 wherein the nucleic acid sequence according to SEQ ID NO: 28 is positioned 3 ' with respect to the chimeric polynucleotide. 18. A host cell transformed or transfected with the expression plasmid according to claim 15. 19. A host cell transformed or transfected witfi the expression plasmid according either claim 16 or 17. 20. Plasmid pDEF2. 21. Plasmid pDEF14. 22. Plasmid pDEFl./ICM3H.2. 23. Plasmid pNEFl/ICM3L.3. 24. Plasmid pDEFl/F2GH.1. 25. Plasmid pNEFl/F2GL.1. 26. Plasmid pDEFl/CTN.1. 27. Plasmid pDEF2/HPH.4. 28. Plasmid pDEFlO/MDC.1. 29. A host cell transformed or transfected with the expression plasmid according to any one of claims 20 through 28. 30. A method for increasing transcription of a gene of interest in a host cell comprising the step of integrating a DNA comprising hamster EF- lα regulatory DNA into genomic DNA of said host cell at a position operatively linked to the gene of interest. 31. The method of claim 30 wherein said DNA to be integrated further comprises a targeting sequence. 32. The method according to claim 30 wherein the host cells is a Chinese hamster ovary cell. 33. The method according to claim 32 wherein the gene of interest is endogenous to the Chinese hamster ovary host cell. 34. The method according to claim 30 wherein the desired gene is heterologous to Chinese hamster ovary cells and is stably integrated into genomic DNA of the Chinese hamster ovary cells.

Inventors: ALLISON DANIEL S, ALLISON, DANIEL, S.
Applicants: ICOS CORP, ICOS CORPORATION
Application year: 1998
Main classification: C12N15
IPC codes: A01K67, C07K14, C12N1, C12N5, C12N15