Patent Publication Number: US-2021171982-A1

Title: Improved clinical parameters by expression of factor viii

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS 
     The present application claims benefit of priority to each of U.S. Provisional Patent Application No. 62/714,553, filed Aug. 3, 2018; U.S. Provisional Patent Application No. 62/826,887, filed Mar. 29, 2019; and U.S. Provisional Patent Application No. 62/869,445, filed Jul. 1, 2019, each of which are incorporated by reference in their entirety. 
    
    
     SEQUENCE LISTING 
     The instant application contains a Sequence Listing, which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Aug. 1, 2019, is named 1147465_SL.txt and is 28,207 bytes in size. 
     BACKGROUND 
     Gene therapy can be used to genetically engineer a cell to have one or more inactivated genes and/or to cause that cell to express a product not previously being produced in that cell (e.g., via transgene insertion and/or via correction of an endogenous sequence). Examples of uses of transgene insertion include the insertion of one or more genes encoding one or more novel therapeutic proteins, insertion of a coding sequence encoding a protein that is lacking in the cell or in the individual, insertion of a wild type gene in a cell containing a mutated gene sequence, and/or insertion of a sequence that encodes a structural nucleic acid such as a microRNA or siRNA. Examples of useful applications of ‘correction’ of an endogenous gene sequence include alterations of disease-associated gene mutations, alterations in sequences encoding splice sites, alterations in regulatory sequences and/or targeted alterations of sequences encoding structural characteristics of a protein. 
     Hepatic gene transfer provides an effective means of delivering transgenes to a subject for treatment and/or prevention of various disorders, including hemophilias and lysosomal storage disorders. See, e.g., U.S. Pat. No. 9,150,847 and U.S. Publication Nos. 20130177983 and 20140017212. Vectors specific for liver-directed gene therapy have also been described. See, e.g., WO 2014064277; WO 2009130208; EP 2451474B1, Chuah et al., (2014)  Molecular Therapy,  22, 1605-1613; and Nair et al. (2014)  Blood  123:3195-3199. These vectors can include the wild-type mouse minute virus (MVM) intron sequence. See, e.g., Haut and Pintel (1998)  J. Virol.  72: 1834-1843; Haut and Pintel (1998)  Virol.  258:84-94. 
     Hemophilias such as Hemophilia A and Hemophilia B, are genetic disorders of the blood-clotting system, characterized by bleeding into joints and soft tissues, and by excessive bleeding into any site experiencing trauma or undergoing surgery. Hemophilia A is clinically indistinguishable from Hemophilia B, but factor VIII (FVIII or F8) is deficient or absent in Hemophilia A while factor IX (FIX or F.IX) is deficient or absent in patients with Hemophilia B. The F8 gene encodes a plasma glycoprotein that circulates in association with von Wilebrand&#39;s factor in its inactive form. Upon surface injury, the intrinsic clotting cascade initiates and FVIII is released from the complex and is activated. The activated form works with Factor IX to activate Factor X to become the activated Xa, eventually leading to change of fibrinogen to fibrin and clot induction. See, Levinson et al. (1990)  Genomics  7(1): 1-11. 40-50% of Hemophilia A patients have a chromosomal inversion involving F8 intron 22 (also known as IVS22). The inversion is caused by an intra-chromosomal recombination event between a 9.6 kb sequence within the intron 22 of the F8 gene and one of the two closely related inversely orientated sequences located about 300 kb distal to the F8 gene, resulting in an inversion of exons 1 to 22 with respect to exons 23 to 26. See,  Textbook of Hemophilia . Lee et al. (eds) 2005, Blackwell Publishing. Other hemophilia A patients have defects in F8 including active site mutations, and nonsense and missense mutations. 
     Clinically, Hemophilia A patients are evaluated and stratified depending on how often a patient has a bleeding episode, and how long those episodes last. Both of these characteristics are directly dependent on the amount of FVIII protein in a patient&#39;s blood. Patients with severe hemophilia typically have less than 1% of the normal blood level of FVIII, experience bleeding following injury and often spontaneous bleeding into their joints. Moderate patients have 1-5% of the normal FVIII level while mild patients have 6% or more of normal FVIII and have bleeding episodes only after serious injury, trauma or surgery (Kulkami et al. (2009)  Haemophilia  15: 1281-90). Patients with Hemophilia A are treated with replacement FVIII protein (often referred to as “factor”) derived either from human plasma or produced recombinantly where the frequency of treatment is based upon bleeding patterns and severity of the hemophilia. Patients with severe Hemophilia A receive prophylaxtic treatment on a regular basis to prevent bleeds from occurring while less severe patients can receive treatment only as needed following injury. 
     Gene therapy for patients with Hemophilia A or B, involving the introduction of plasmid and other vectors (e.g., AAV) encoding a functional FVIII or F.IX proteins have been described. (See, e.g., U.S. Pat. Nos. 6,936,243; 7,238,346 and 6,200,560; Shi et al. (2007)  J Thromb Haemost . (2): 352-61; Lee et al. (2004)  Pharm. Res.  7: 1229-1232; Graham et al. (2008)  Genet Vaccines Ther.  3:6-9; Manno et al. (2003)  Blood  101(8): 2963-72; Manno et al. (2006)  Nature Medicine  12(3): 342-7; Nathwani et al. (2011)  Mol Ther  19(5): 876-85; Nathwani et al. (2011);  N Engl J Med.  365(25): 2357-65 and Mcintosh et al. (2013)  Blood  121 (17): 3335-44). 
     BRIEF SUMMARY OF THE INVENTION 
     AAV vectors expressing Factor VIII and methods of treatment of hemophilia as well as other aspects are disclosed. In some embodiments, a method of providing a Factor VIII (FVIII) protein to a human is provided. In some embodiments, the method comprises administering to the human one or more dose of from 6×10 11  to 1×10 13  or 3×10 13 , 1×10 13  to 1×10 14 , or 1×10 13  to 5×10 13 , or 2×10 13  to 4×10 13  vg/kg of an Adenovirus-Associated Virus (AAV) vector as described herein, wherein administration of the AAV vector results in production of the Factor VIII protein in the human. In some embodiments, the dose is 9×10 11  vg/kg, 2×10 12  vg/kg, 1×10 13  vg/kg, 2×10 13  vg/kg, 3×10 13  vg/kg or 4×10 13  vg/kg. In some embodiments, the AAV vector has an AAV6 serotype comprising a nucleotide sequence comprising AAV2 inverted terminal repeat sequences flanking an expression cassette comprising a liver-specific enhancer and a promoter operably linked to a polynucleotide encoding SEQ ID NO:1. 
     In some embodiments, the method further comprises measuring FVIII protein in blood of the human before and after the administrating. 
     In some embodiments, administration of the AAV vector, e.g., at a dose ranging from 1×10 13  vg/kg to 3×10 13  or 1×10 13  to 1×10 14 , or 1×10 13  to 5×10 13 , or 2×10 13  to 4×10 13  vg/kg, results in a clinically relevant increase in FVIII activity, relative to patient circulating FVIII activity assessed in the patient before administration, ranging from 5% to 150%, or greater. In some embodiments, administration of the AAV vector, e.g., at a dose of 3×10 13  vg/kg, results in a clinically relevant increase in FVIII activity ranging from 20% to 150%, or greater. In some embodiments, administration results in one or zero occurrences of spontaneous bleeding episodes in the human subject between 3-12 months (or, e.g., 3-6 months, 3 months-1, 2, 5 or 10 years, or more) after administration. 
     In some embodiments, provided herein is a method of increasing Factor VIII (FVIII) protein in a human subject, comprising administering to the human subject one or more doses of from 2×10 12  vg/kg to 3×10 13  or 1×10 13  to 1×10 14 , or 1×10 13  to 5×10 13 , or 2×10 13  to 4×10 13  vg/kg of an Adenovirus-Associated Virus (AAV) vector that encodes a FVIII protein (optionally comprising the amino acid sequence of SEQ ID NO:1), wherein administration of the AAV vector results in a clinically relevant increase of the level of circulating FVIII activity, e.g., by 5% to 150%; or by 50% to 150%. In some embodiments, the one or more doses of Factor VIII administered to the patient is in the range from 1×10 13  vg/kg to 3×10 13  vg/kg. In some embodiments, the AAV vector has an AAV6 serotype. In some embodiments, the AAV vector comprises an expression cassette comprising a polynucleotide that encodes the FVIII protein operably linked to a liver-specific enhancer and a promoter. In some embodiments, the liver-specific enhancer is a Serpin 1 enhancer and/or the promoter is a transthyretin minimal promoter. In some embodiments, the liver-specific enhancer comprises the nucleotide sequence of SEQ ID NO:2 and/or the promoter comprises the nucleotide sequence of SEQ ID NO:3. In some embodiments, the AAV vector comprises a AAV2 5′ inverted terminal repeat (ITR) sequence and AAV2 3′ ITR sequence that flank the expression cassette. In some embodiments, the AAV2 5′ ITR comprises the nucleotide sequence of SEQ ID NO:12 and/or the AAV2 3′ITR comprises the nucleotide sequence of SEQ ID NO:13. In some embodiments, the sequence of the expression cassette comprises the nucleotide sequence of SEQ ID NO:5. In some embodiments the human subject has hemophilia. 
     In some embodiments, provided herein is a method of increasing Factor VIII (FVIII) protein in a human subject, comprising administering to the human subject one or more doses of from 2×10 12  vg/kg to 3×10 13  or 1×10 13  to 1×10 14 , or 1×10 13  to 5×10 13 , or 2×10 13  to 4×10 13  vg/kg of an Adenovirus-Associated Virus (AAV) vector that encodes a FVIII protein (optionally comprising the amino acid sequence of SEQ ID NO:1), wherein administration of the AAV vector results a reduction of the number of FVIII treatments the human subject receives. In some embodiments, the human subject does not receive any FVIII treatments 3-12 months (or, e.g., 3-6 months, 3 months-1, 2, 5 or 10 years, or more) after administration. In some embodiments, the one or more doses of Factor VIII administered to the patient is in the range from 1×10 13  vg/kg to 3×10 13  vg/kg. In some embodiments, the AAV vector has an AAV6 serotype. In some embodiments, the AAV vector comprises an expression cassette comprising a polynucleotide that encodes the FVIII protein operably linked to a liver-specific enhancer and a promoter. In some embodiments, the liver-specific enhancer is a Serpin 1 enhancer and/or the promoter is a transthyretin minimal promoter. In some embodiments, the liver-specific enhancer comprises the nucleotide sequence of SEQ ID NO:2 and/or the promoter comprises the nucleotide sequence of SEQ ID NO:3. In some embodiments, the AAV vector comprises a AAV2 5′ inverted terminal repeat (ITR) sequence and AAV2 3′ ITR sequence that flank the expression cassette. In some embodiments, the AAV2 5′ ITR comprises the nucleotide sequence of SEQ ID NO:12 and/or the AAV2 3′ITR comprises the nucleotide sequence of SEQ ID NO:13. In some embodiments, the sequence of the expression cassette comprises the nucleotide sequence of SEQ ID NO:5. In some embodiments the human subject has hemophilia. 
     In some embodiments, administration of the AAV vector, e.g., at a dose ranging from 2×10 12  vg/kg to 3×10 13  or 1×10 13  to 1×10 14 , or 1×10 13  to 5×10 13 , or 2×10 13  to 4×10 13  vg/kg, results in a reduction in use of FVIII treatments, e.g., a reduction in the number of FVIII injections a patient receives per week or per month. In some embodiments, use of FVIII is reduced by at least 20%. In further embodiments, use of FVIII is reduced by at least 50%. In some embodiments, use of FVIII is reduced by 90% or greater. 
     In some embodiments, prior to the administrating the human had less than 1% of normal human circulating FVIII activity and within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administrating the human has at least 1% of normal human circulating FVIII activity. 
     In some embodiments, prior to the administrating the human had less than 5% of normal human circulating FVIII activity and within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administrating the human has at least 5% of normal human circulating FVIII activity. 
     In some embodiments, the human displays no more than 1.5 times upper limit of normal (ULN) of at least one of alanine aminotransferase (ALT), aspartate aminotransferase (AST), bilirubin, alkaline phosphatase, or albumin within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks of the administering. 
     In some embodiments, the human does not have detectable levels of FVIII inhibitor 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administrating. 
     In some embodiments, the subject to be administered the AAV vector undergoes prophylactic steroid treatment. 
     In some embodiments, the method further comprises measuring a level of at least one of Von Willebrand factor (vWF), soluble epidermal growth factor receptor (sEGFR), Galectin-3-binding protein (GAL3BP), C-reactive protein (CRP), IL-6, circulating alpha fetoprotein, prior to the administrating and within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administering. 
     In some embodiments, a level of Von Willebrand factor (vWF), soluble epidermal growth factor receptor (sEGFR), Galectin-3-binding protein (GAL3BP), C-reactive protein (CRP), IL-6, circulating alpha fetoprotein, within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administering is no more than 1.5 times a level within two weeks prior to the administering. 
     In some embodiments, the human displays fewer bleeding episodes after the administering. In some embodiments, the human has 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% fewer bleeding episodes after the administering. 
     In some embodiments, the human displays a reduced need for treatment with replacement Factor VIII protein. In some embodiments, the human requires 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% less treatment with replacement Factor VIII protein after the administering. 
     In some embodiments, the human has hemophilia. 
     In some embodiments, the nucleotide sequence comprises SEQ ID NO:5. In some embodiments, the AAV2 inverted terminal repeat sequences are SEQ ID NO:12 and SEQ ID NO:13. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows FVIII activity data from Example 6 using a chromogenic assay as described in Example 1. 
         FIG. 2  shows FVIII activity data from Example 6 using a chromogenic assay as described in Example 1. 
         FIG. 3  shows FVIII activity data from Example 6 using a one-stage clotting assay as described in Example 1. 
         FIG. 4  shows FVIII activity based on a one-stage clotting assay as described in Example 1 in ten patients over time post-treatment with the vector. 
         FIG. 5  shows FVIII activity based on a chromogenic assay as described in Example 1 in ten patients over time post-treatment with the vector. 
         FIG. 6  shows data for spontaneous bleeding episodes of patients at least 3 weeks after vector administration at the dosage indicated. 
         FIG. 7  shows FVIII usage of patients three or more weeks post-vector injection. 
         FIG. 8  provides a Serious Adverse Event (SAE) summary. 
         FIG. 9  provides a Treatment-Related Adverse Event (AE) Summary. 
         FIG. 10  provides a summary of results. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Introduction 
     The inventors have discovered that certain AAV vectors expressing Factor VIII (FVIII) are effective in generating increased FVIII activity in humans, including humans having hemophilia. For example, it has been discovered that administration of the AAV vector as described herein in some embodiments results in raised circulating FVIII activity from less than 1% normal FVIII activity to at least 1% and in some embodiments at least 2, 3, 4, or 5% normal FVIII activity. Moreover, in some embodiments, circulating FVIII activity is increased in a human with little or no adverse effect on liver function or other biomarkers as described herein. At administered concentrations of vector at or above 1×10 13  vg/kg, rates of bleeding episodes at 3 weeks (or more than 3 weeks) after administration dropped to zero for most patients, indicating that concentrations at or above 1×10 13  vg/kg (e.g., 1×10 13  vg/kg to 1×10 14  vg/kg, e.g. 2-4×10 13  vg/kg) resulted in highly effective treatment. Thus, in some embodiments, patients receiving the vector at these concentrations do not require further FVIII infusions, or at least do not require them in within 3, 6, 9, or 12 months after vector administration. 
     Adeno-Associated Virus (AAV) vectors that encode FVIII are provided. Exemplary AAV vectors are of the AAV6 serotype and comprise inverted repeat (ITR) sequences flanking an expression cassette comprising a liver-specific enhancer and promoter operably linked to an intron and a polynucleotide encoding FVIII. An exemplary FVIII is SEQ ID NO:1. In some embodiments, the ITR sequences are AAV2 ITRs, and thus the vector can be referred to as an “AAV2/6” vector. For the genomic sequence of AAV serotypes and a discussion of the genomic similarities see, for example, GenBank Accession number AF028704.1; GenBank Accession number J01901.1; Chiorini et al.,  J. Vir.  71: 6823-33(1997); Srivastava et al.,  J. Vir.  45:555-64 (1983); Chiorini et al.,  J. Vir.  73: 1309-1319 (1999); Rutledge et al.,  J. Vir.  72:309-319 (1998); and Wu et al.,  J. Vir.  74: 8635-47 (2000). 
     Exemplary AAV2 ITR Sequences are: 
       
     
       
         
           
               
            
               
                 AAV2 5′ ITR: 
               
               
                 (SEQ ID NO: 12) 
               
               
                 CTGCGCGCTCGCTCGCTCACTGAGGCCGCCCGGGCAAAGCCCGGGCGTCG 
               
               
                 GGCGACCTTTGGTCGCCCGGCCTCAGTGAGCGAGCGAGCGCGCAGAGAGG 
               
               
                 GAGTGGCCAACTCCATCACTAGGGGTTCCT. 
               
               
                   
               
               
                 AAV2 3′ITR: 
               
               
                 (SEQ ID NO: 13) 
               
               
                 AGGAACCCCTAGTGATGGAGTTGGCCACTCCCTCTCTGCGCGCTCGCTCG 
               
               
                 CTCACTGAGGCCGCCCGGGCTTTGCCCGGGCGGCCTCAGTGAGCGAGCGA 
               
               
                 GCGCGCAG. 
               
            
           
         
       
     
     Exemplary liver-specific enhancers include for example a wild-type or mutated Serpin1 enhancers and an exemplary promoter is a transthyretin minimal (TTRm) promoter. Thus in some embodiments, the AAV vector is an AAV2/6 vector comprising AAV2 ITR sequences flanking a wild-type or mutated Serpin1 enhancer linked to a TTRm promoter operably linked to a polynucleotide encoding FVIII (e.g., SEQ ID NO:1). Exemplary vector sequences are described in for example, WO 2017/074526. 
     SEQ ID NO: 1 Displays the Human FVIII Amino Acid Sequence with Signal Peptide: 
     
       
         
           
               
            
               
                 MQIELSTCFFLCLLRFCFSATRRYYLGAVELSWDYMQSDLGELPVDARF 
               
               
                   
               
               
                 PPRVPKSFPFNTSVVYKKTLFVEFTDHLFNIAKPRPPWMGLLGPTIQAE 
               
               
                   
               
               
                 VYDTVVITLKNMASHPVSLHAVGVSYWKASEGAEYDDQTSQREKEDDKV 
               
               
                   
               
               
                 FPGGSHTYVWQVLKENGPMASDPLCLTYSYLSHVDLVKDLNSGLIGALL 
               
               
                   
               
               
                 VCREGSLAKEKTQTLHKFILLFAVFDEGKSWHSETKNSLMQDRDAASAR 
               
               
                   
               
               
                 AWPKMHTVNGYVNRSLPGLIGCHRKSVYWHVIGMGTTPEVHSIFLEGHT 
               
               
                   
               
               
                 FLVRNHRQASLEISPITFLTAQTLLMDLGQFLLFCHISSHQHDGMEAYV 
               
               
                   
               
               
                 KVDSCPEEPQLRMKNNEEAEDYDDDLTDSEMDVVRFDDDNSPSFIQIRS 
               
               
                   
               
               
                 VAKKHPKTWVHYIAAEEEDWDYAPLVLAPDDRSYKSQYLNNGPQRIGRK 
               
               
                   
               
               
                 YKKVRFMAYTDETFKTREAIQHESGILGPLLYGEVGDTLLIIFKNQASR 
               
               
                   
               
               
                 PYNIYPHGITDVRPLYSRRLPKGVKHLKDFPILPGEIFKYKWTVTVEDG 
               
               
                   
               
               
                 PTKSDPRCLTRYYSSFVNMERDLASGLIGPLLICYKESVDQRGNQIMSD 
               
               
                   
               
               
                 KRNVILFSVFDENRSWYLTENIQRFLPNPAGVQLEDPEFQASNIMHSIN 
               
               
                   
               
               
                 GYVFDSLQLSVCLHEVAYWYILSIGAQTDFLSVFFSGYTFKHKMVYEDT 
               
               
                   
               
               
                 LTLFPFSGETVFMSMENPGLWILGCHNSDFRNRGMTALLKVSSCDKNTG 
               
               
                   
               
               
                 DYYEDSYEDISAYLLSKNNAIEPRSFSQNPPVLKRHQREITRTTLQSDQ 
               
               
                   
               
               
                 EEIDYDDTISVEMKKEDFDIYDEDENQSPRSFQKKTRHYFIAAVERLWD 
               
               
                   
               
               
                 YGMSSSPHVLRNRAQSGSVPQFKKVVFQEFTDGSFTQPLYRGELNEHLG 
               
               
                   
               
               
                 LLGPYIRAEVEDNIMVTFRNQASRPYSFYSSLISYEEDQRQGAEPRKNF 
               
               
                   
               
               
                 VKPNETKTYFWKVQHHMAPTKDEFDCKAWAYFSDVDLEKDVHSGLIGPL 
               
               
                   
               
               
                 LVCHTNTLNPAHGRQVTVQEFALFFTIFDETKSWYFTENMERNCRAPCN 
               
               
                   
               
               
                 IQMEDPTFKENYRFHAINGYIMDTLPGLVMAQDQRIRWYLLSMGSNENI 
               
               
                   
               
               
                 HSIHFSGHVFTVRKKEEYKMALYNLYPGVFETVEMLPSKAGIWRVECLI 
               
               
                   
               
               
                 GEHLHAGMSTLFLVYSNKCQTPLGMASGHIRDFQITASGQYGQWAPKLA 
               
               
                   
               
               
                 RLHYSGSINAWSTKEPFSWIKVDLLAPMIIHGIKTQGARQKFSSLYISQ 
               
               
                   
               
               
                 FIIMYSLDGKKWQTYRGNSTGTLMVFFGNVDSSGIKHNIFNPPIIARYI 
               
               
                   
               
               
                 RLHPTHYSIRSTLRMELMGCDLNSCSMPLGMESKAISDAQITASSYFTN 
               
               
                   
               
               
                 MFATWSPSKARLHLQGRSNAWRPQVNNPKEWLQVDFQKTMKVTGVTTQG 
               
               
                   
               
               
                 VKSLLTSMYVKEFLISSSQDGHQWTLFFQNGKVKVFQGNQDSFTPVVNS 
               
               
                   
               
               
                 LDPPLLTRYLRIHPQSWVHQIALRMEVLGCEAQDLY. 
               
            
           
         
       
     
     The signal peptide portion of SEQ ID NO:1 is MQIELSTCFFLCLLRFCFS (SEQ ID NO:14), which is cleaved off when the protein is secreted. 
     For example, an exemplary SERPIN1 enhancer is 
     
       
         
           
               
            
               
                 (SEQ ID NO: 2) 
               
               
                 GGGGGAGGCTGCTGGTGAATATTAACCAAGATCACCCCAGTTACCGGAG 
               
               
                 GAGCAAACAGGGACTAAGTTCACACGCGTGGTACC. 
               
            
           
         
       
     
     An exemplary TTRm promoter is 
     
       
         
           
               
            
               
                 (SEQ ID NO: 3) 
               
               
                 GTCTGTCTGCACATTTCGTAGAGCGAGTGTTCCGATACTCTAATCTCCC 
               
               
                   
               
               
                 TAGGCAAGGTTCATATTTGTGTAGGTTACTTATTCTCCTTTTGTTGACT 
               
               
                   
               
               
                 AAGTCAATAATCAGAATCAGCAGGTTTGGAGTCAGCTTGGCAGGGATCA 
               
               
                   
               
               
                 GCAGCCTGGGTTGGAAGGAGGGGGTATAAAAGCCCCTTCACCAGGAGAA 
               
               
                   
               
               
                 GCCGTCACACAGATCCACAAGCTCCTG. 
               
            
           
         
       
     
     An exemplary coding sequence for FVIII is: 
     
       
         
           
               
            
               
                 (SEQ ID NO: 4) 
               
               
                 ATGCAGATCGAGCTCTCCACCTGCTTCTTTCTGTGCCTGTTGAGATTCT 
               
               
                   
               
               
                 GCTTCAGCGCCACCAGGAGATACTACCTGGGGGCTGTGGAGCTGAGCTG 
               
               
                   
               
               
                 GGACTACATGCAGTCTGACCTGGGGGAGCTGCCTGTGGATGCCAGGTTC 
               
               
                   
               
               
                 CCCCCCAGAGTGCCCAAGAGCTTCCCCTTCAACACCTCTGTGGTGTACA 
               
               
                   
               
               
                 AGAAGACCCTGTTTGTGGAGTTCACTGACCACCTGTTCAACATTGCCAA 
               
               
                   
               
               
                 GCCCAGGCCCCCCTGGATGGGCCTGCTGGGCCCCACCATCCAGGCTGAG 
               
               
                   
               
               
                 GTGTATGACACTGTGGTGATCACCCTGAAGAACATGGCCAGCCACCCTG 
               
               
                   
               
               
                 TGAGCCTGCATGCTGTGGGGGTGAGCTACTGGAAGGCCTCTGAGGGGGC 
               
               
                   
               
               
                 TGAGTATGATGACCAGACCAGCCAGAGGGAGAAGGAGGATGACAAGGTG 
               
               
                   
               
               
                 TTCCCTGGGGGCAGCCACACCTATGTGTGGCAGGTGCTGAAGGAGAATG 
               
               
                   
               
               
                 GCCCCATGGCCTCTGACCCCCTGTGCCTGACCTACAGCTACCTGAGCCA 
               
               
                   
               
               
                 TGTGGACCTGGTGAAGGACCTGAACTCTGGCCTGATTGGGGCCCTGCTG 
               
               
                   
               
               
                 GTGTGCAGGGAGGGCAGCCTGGCCAAGGAGAAGACCCAGACCCTGCACA 
               
               
                   
               
               
                 AGTTCATCCTGCTGTTTGCTGTGTTTGATGAGGGCAAGAGCTGGCACTC 
               
               
                   
               
               
                 TGAAACCAAGAACAGCCTGATGCAGGACAGGGATGCTGCCTCTGCCAGG 
               
               
                   
               
               
                 GCCTGGCCCAAGATGCACACTGTGAATGGCTATGTGAACAGGAGCCTGC 
               
               
                   
               
               
                 CTGGCCTGATTGGCTGCCACAGGAAGTCTGTGTACTGGCATGTGATTGG 
               
               
                   
               
               
                 CATGGGCACCACCCCTGAGGTGCACAGCATCTTCCTGGAGGGCCACACC 
               
               
                   
               
               
                 TTCCTGGTCAGGAACCACAGGCAGGCCAGCCTGGAGATCAGCCCCATCA 
               
               
                   
               
               
                 CCTTCCTGACTGCCCAGACCCTGCTGATGGACCTGGGCCAGTTCCTGCT 
               
               
                   
               
               
                 GTTCTGCCACATCAGCAGCCACCAGCATGATGGCATGGAGGCCTATGTG 
               
               
                   
               
               
                 AAGGTGGACAGCTGCCCTGAGGAGCCCCAGCTGAGGATGAAGAACAATG 
               
               
                   
               
               
                 AGGAGGCTGAGGACTATGATGATGACCTGACTGACTCTGAGATGGATGT 
               
               
                   
               
               
                 GGTGAGGTTTGATGATGACAACAGCCCCAGCTTCATCCAGATCAGGTCT 
               
               
                   
               
               
                 GTGGCCAAGAAGCACCCCAAGACCTGGGTGCACTACATTGCTGCTGAGG 
               
               
                   
               
               
                 AGGAGGACTGGGACTATGCCCCCCTGGTGCTGGCCCCTGATGACAGGAG 
               
               
                   
               
               
                 CTACAAGAGCCAGTACCTGAACAATGGCCCCCAGAGGATTGGCAGGAAG 
               
               
                   
               
               
                 TACAAGAAGGTCAGGTTCATGGCCTACACTGATGAAACCTTCAAGACCA 
               
               
                   
               
               
                 GGGAGGCCATCCAGCATGAGTCTGGCATCCTGGGCCCCCTGCTGTATGG 
               
               
                   
               
               
                 GGAGGTGGGGGACACCCTGCTGATCATCTTCAAGAACCAGGCCAGCAGG 
               
               
                   
               
               
                 CCCTACAACATCTACCCCCATGGCATCACTGATGTGAGGCCCCTGTACA 
               
               
                   
               
               
                 GCAGGAGGCTGCCCAAGGGGGTGAAGCACCTGAAGGACTTCCCCATCCT 
               
               
                   
               
               
                 GCCTGGGGAGATCTTCAAGTACAAGTGGACTGTGACTGTGGAGGATGGC 
               
               
                   
               
               
                 CCCACCAAGTCTGACCCCAGGTGCCTGACCAGATACTACAGCAGCTTTG 
               
               
                   
               
               
                 TGAACATGGAGAGGGACCTGGCCTCTGGCCTGATTGGCCCCCTGCTGAT 
               
               
                   
               
               
                 CTGCTACAAGGAGTCTGTGGACCAGAGGGGCAACCAGATCATGTCTGAC 
               
               
                   
               
               
                 AAGAGGAATGTGATCCTGTTCTCTGTGTTTGATGAGAACAGGAGCTGGT 
               
               
                   
               
               
                 ACCTGACTGAGAACATCCAGAGGTTCCTGCCCAACCCTGCTGGGGTGCA 
               
               
                   
               
               
                 GCTGGAGGACCCTGAGTTCCAGGCCAGCAACATCATGCACAGCATCAAT 
               
               
                   
               
               
                 GGCTATGTGTTTGACAGCCTGCAGCTGTCTGTGTGCCTGCATGAGGTGG 
               
               
                   
               
               
                 CCTACTGGTACATCCTGAGCATTGGGGCCCAGACTGACTTCCTGTCTGT 
               
               
                   
               
               
                 GTTCTTCTCTGGCTACACCTTCAAGCACAAGATGGTGTATGAGGACACC 
               
               
                   
               
               
                 CTGACCCTGTTCCCCTTCTCTGGGGAGACTGTGTTCATGAGCATGGAGA 
               
               
                   
               
               
                 ACCCTGGCCTGTGGATTCTGGGCTGCCACAACTCTGACTTCAGGAACAG 
               
               
                   
               
               
                 GGGCATGACTGCCCTGCTGAAAGTCTCCAGCTGTGACAAGAACACTGGG 
               
               
                   
               
               
                 GACTACTATGAGGACAGCTATGAGGACATCTCTGCCTACCTGCTGAGCA 
               
               
                   
               
               
                 AGAACAATGCCATTGAGCCCAGGAGCTTCAGCCAGAATCCACCCGTCCT 
               
               
                   
               
               
                 TAAGCGCCATCAGCGCGAGATCACCAGGACCACCCTGCAGTCTGACCAG 
               
               
                   
               
               
                 GAGGAGATTGACTATGATGACACCATCTCTGTGGAGATGAAGAAGGAGG 
               
               
                   
               
               
                 ACTTTGACATCTACGACGAGGACGAGAACCAGAGCCCCAGGAGCTTCCA 
               
               
                   
               
               
                 GAAGAAGACCAGGCACTACTTCATTGCTGCTGTGGAGAGGCTGTGGGAC 
               
               
                   
               
               
                 TATGGCATGAGCAGCAGCCCCCATGTGCTGAGGAACAGGGCCCAGTCTG 
               
               
                   
               
               
                 GCTCTGTGCCCCAGTTCAAGAAGGTGGTGTTCCAGGAGTTCACTGATGG 
               
               
                   
               
               
                 CAGCTTCACCCAGCCCCTGTACAGAGGGGAGCTGAATGAGCACCTGGGC 
               
               
                   
               
               
                 CTGCTGGGCCCCTACATCAGGGCTGAGGTGGAGGACAACATCATGGTGA 
               
               
                   
               
               
                 CCTTCAGGAACCAGGCCAGCAGGCCCTACAGCTTCTACAGCAGCCTGAT 
               
               
                   
               
               
                 CAGCTATGAGGAGGACCAGAGGCAGGGGGCTGAGCCCAGGAAGAACTTT 
               
               
                   
               
               
                 GTGAAGCCCAATGAAACCAAGACCTACTTCTGGAAGGTGCAGCACCACA 
               
               
                   
               
               
                 TGGCCCCCACCAAGGATGAGTTTGACTGCAAGGCCTGGGCCTACTTCTC 
               
               
                   
               
               
                 TGATGTGGACCTGGAGAAGGATGTGCACTCTGGCCTGATTGGCCCCCTG 
               
               
                   
               
               
                 CTGGTGTGCCACACCAACACCCTGAACCCTGCCCATGGCAGGCAGGTGA 
               
               
                   
               
               
                 CTGTGCAGGAGTTTGCCCTGTTCTTCACCATCTTTGATGAAACCAAGAG 
               
               
                   
               
               
                 CTGGTACTTCACTGAGAACATGGAGAGGAACTGCAGGGCCCCCTGCAAC 
               
               
                   
               
               
                 ATCCAGATGGAGGACCCCACCTTCAAGGAGAACTACAGGTTCCATGCCA 
               
               
                   
               
               
                 TCAATGGCTACATCATGGACACCCTGCCTGGCCTGGTGATGGCCCAGGA 
               
               
                   
               
               
                 CCAGAGGATCAGGTGGTACCTGCTGAGCATGGGCAGCAATGAGAACATC 
               
               
                   
               
               
                 CACAGCATCCACTTCTCTGGCCATGTGTTCACTGTGAGGAAGAAGGAGG 
               
               
                   
               
               
                 AGTACAAGATGGCCCTGTACAACCTGTACCCTGGGGTGTTTGAGACTGT 
               
               
                   
               
               
                 GGAGATGCTGCCCAGCAAGGCTGGCATCTGGAGGGTGGAGTGCCTGATT 
               
               
                   
               
               
                 GGGGAGCACCTGCATGCTGGCATGAGCACCCTGTTCCTGGTGTACAGCA 
               
               
                   
               
               
                 ACAAGTGCCAGACCCCCCTGGGCATGGCCTCTGGCCACATCAGGGACTT 
               
               
                   
               
               
                 CCAGATCACTGCCTCTGGCCAGTATGGCCAGTGGGCCCCCAAGCTGGCC 
               
               
                   
               
               
                 AGGCTGCACTACTCTGGCAGCATCAATGCCTGGAGCACCAAGGAGCCCT 
               
               
                   
               
               
                 TCAGCTGGATCAAGGTGGACCTGCTGGCCCCCATGATCATCCATGGCAT 
               
               
                   
               
               
                 CAAGACCCAGGGGGCCAGGCAGAAGTTCAGCAGCCTGTACATCAGCCAG 
               
               
                   
               
               
                 TTCATCATCATGTACAGCCTGGATGGCAAGAAGTGGCAGACCTACAGGG 
               
               
                   
               
               
                 GCAACAGCACTGGCACCCTGATGGTGTTCTTTGGCAATGTGGACAGCTC 
               
               
                   
               
               
                 TGGCATCAAGCACAACATCTTCAACCCCCCCATCATTGCCAGATACATC 
               
               
                   
               
               
                 AGGCTGCACCCCACCCACTACAGCATCAGGAGCACCCTGAGGATGGAGC 
               
               
                   
               
               
                 TGATGGGCTGTGACCTGAACAGCTGCAGCATGCCCCTGGGCATGGAGAG 
               
               
                   
               
               
                 CAAGGCCATCTCTGATGCCCAGATCACTGCCAGCAGCTACTTCACCAAC 
               
               
                   
               
               
                 ATGTTTGCCACCTGGAGCCCCAGCAAGGCCAGGCTGCATCTGCAGGGCA 
               
               
                   
               
               
                 GGAGCAATGCCTGGAGGCCCCAGGTCAACAACCCCAAGGAGTGGCTGCA 
               
               
                   
               
               
                 GGTGGACTTCCAGAAGACCATGAAGGTGACTGGGGTGACCACCCAGGGG 
               
               
                   
               
               
                 GTGAAGAGCCTGCTGACCAGCATGTATGTGAAGGAGTTCCTGATCAGCA 
               
               
                   
               
               
                 GCAGCCAGGATGGCCACCAGTGGACCCTGTTCTTCCAGAATGGCAAGGT 
               
               
                   
               
               
                 GAAGGTGTTCCAGGGCAACCAGGACAGCTTCACCCCTGTGGTGAACAGC 
               
               
                   
               
               
                 CTGGACCCCCCCCTGCTGACCAGATACCTGAGGATTCACCCCCAGAGCT 
               
               
                   
               
               
                 GGGTGCACCAGATTGCCCTGAGGATGGAGGTGCTGGGCTGTGAGGCCCA 
               
               
                   
               
               
                 GGACCTGTACTGA. 
               
            
           
         
       
     
     An exemplary sequence for the expression cassette flanked by the inverted terminal repeat sequences is: 
                        (SEQ ID NO: 5)           GCGGCCTAAGCTTGGAACCATTGCCACCTTCAGGGGGAGGCTGCTGGTGA - 50                   ATATTAACCAAGATCACCCCAGTTACCGGAGGAGCAAACAGGGACTAAGT - 100               TCACACGCGTGGTACCGTCTGTCTGCACATTTCGTAGAGCGAGTGTTCCG - 150               ATACTCTAATCTCCCTAGGCAAGGTTCATATTTGTGTAGGTTACTTATTC - 200               TCCTTTTGTTGACTAAGTCAATAATCAGAATCAGCAGGTTTGGAGTCAGC - 250               TTGGCAGGGATCAGCAGCCTGGGTTGGAAGGAGGGGGTATAAAAGCCCCT - 300               TCACCAGGAGAAGCCGTCACACAGATCCACAAGCTCCTGAAGAGGTAAGG - 350               GTTTAAGTTATCGTTAGTTCGTGCACCATTAATGTTTAATTACCTGGAGC - 400               ACCTGCCTGAAATCATTTTTTTTTCAGGTTGGCTAGTATGCAGATCGAGC - 450               TCTCCACCTGCTTCTTTCTGTGCCTGTTGAGATTCTGCTTCAGCGCCACC - 500               AGGAGATACTACCTGGGGGCTGTGGAGCTGAGCTGGGACTACATGCAGTC - 550               TGACCTGGGGGAGCTGCCTGTGGATGCCAGGTTCCCCCCCAGAGTGCCCA - 600               AGAGCTTCCCCTTCAACACCTCTGTGGTGTACAAGAAGACCCTGTTTGTG - 650               GAGTTCACTGACCACCTGTTCAACATTGCCAAGCCCAGGCCCCCCTGGAT - 700               GGGCCTGCTGGGCCCCACCATCCAGGCTGAGGTGTATGACACTGTGGTGA - 750               TCACCCTGAAGAACATGGCCAGCCACCCTGTGAGCCTGCATGCTGTGGGG - 800               GTGAGCTACTGGAAGGCCTCTGAGGGGGCTGAGTATGATGACCAGACCAG - 850               CCAGAGGGAGAAGGAGGATGACAAGGTGTTCCCTGGGGGCAGCCACACCT - 900               ATGTGTGGCAGGTGCTGAAGGAGAATGGCCCCATGGCCTCTGACCCCCTG - 950               TGCCTGACCTACAGCTACCTGAGCCATGTGGACCTGGTGAAGGACCTGAA - 1000               CTCTGGCCTGATTGGGGCCCTGCTGGTGTGCAGGGAGGGCAGCCTGGCCA - 1050               AGGAGAAGACCCAGACCCTGCACAAGTTCATCCTGCTGTTTGCTGTGTTT - 1100               GATGAGGGCAAGAGCTGGCACTCTGAAACCAAGAACAGCCTGATGCAGGA - 1150               CAGGGATGCTGCCTCTGCCAGGGCCTGGCCCAAGATGCACACTGTGAATG - 1200               GCTATGTGAACAGGAGCCTGCCTGGCCTGATTGGCTGCCACAGGAAGTCT - 1250               GTGTACTGGCATGTGATTGGCATGGGCACCACCCCTGAGGTGCACAGCAT - 1300               CTTCCTGGAGGGCCACACCTTCCTGGTCAGGAACCACAGGCAGGCCAGCC - 1350               TGGAGATCAGCCCCATCACCTTCCTGACTGCCCAGACCCTGCTGATGGAC - 1400               CTGGGCCAGTTCCTGCTGTTCTGCCACATCAGCAGCCACCAGCATGATGG - 1450               CATGGAGGCCTATGTGAAGGTGGACAGCTGCCCTGAGGAGCCCCAGCTGA - 1500               GGATGAAGAACAATGAGGAGGCTGAGGACTATGATGATGACCTGACTGAC - 1550               TCTGAGATGGATGTGGTGAGGTTTGATGATGACAACAGCCCCAGCTTCAT - 1600               CCAGATCAGGTCTGTGGCCAAGAAGCACCCCAAGACCTGGGTGCACTACA - 1650               TTGCTGCTGAGGAGGAGGACTGGGACTATGCCCCCCTGGTGCTGGCCCCT - 1700               GATGACAGGAGCTACAAGAGCCAGTACCTGAACAATGGCCCCCAGAGGAT - 1750               TGGCAGGAAGTACAAGAAGGTCAGGTTCATGGCCTACACTGATGAAACCT - 1800               TCAAGACCAGGGAGGCCATCCAGCATGAGTCTGGCATCCTGGGCCCCCTG - 1850               CTGTATGGGGAGGTGGGGGACACCCTGCTGATCATCTTCAAGAACCAGGC - 1900               CAGCAGGCCCTACAACATCTACCCCCATGGCATCACTGATGTGAGGCCCC - 1950               TGTACAGCAGGAGGCTGCCCAAGGGGGTGAAGCACCTGAAGGACTTCCCC - 2000               ATCCTGCCTGGGGAGATCTTCAAGTACAAGTGGACTGTGACTGTGGAGGA - 2050               TGGCCCCACCAAGTCTGACCCCAGGTGCCTGACCAGATACTACAGCAGCT - 2100               TTGTGAACATGGAGAGGGACCTGGCCTCTGGCCTGATTGGCCCCCTGCTG - 2150               ATCTGCTACAAGGAGTCTGTGGACCAGAGGGGCAACCAGATCATGTCTGA - 2200               CAAGAGGAATGTGATCCTGTTCTCTGTGTTTGATGAGAACAGGAGCTGGT - 2250               ACCTGACTGAGAACATCCAGAGGTTCCTGCCCAACCCTGCTGGGGTGCAG - 2300               CTGGAGGACCCTGAGTTCCAGGCCAGCAACATCATGCACAGCATCAATGG - 2350               CTATGTGTTTGACAGCCTGCAGCTGTCTGTGTGCCTGCATGAGGTGGCCT - 2400               ACTGGTACATCCTGAGCATTGGGGCCCAGACTGACTTCCTGTCTGTGTTC - 2450               TTCTCTGGCTACACCTTCAAGCACAAGATGGTGTATGAGGACACCCTGAC - 2500               CCTGTTCCCCTTCTCTGGGGAGACTGTGTTCATGAGCATGGAGAACCCTG - 2550               GCCTGTGGATTCTGGGCTGCCACAACTCTGACTTCAGGAACAGGGGCATG - 2600               ACTGCCCTGCTGAAAGTCTCCAGCTGTGACAAGAACACTGGGGACTACTA - 2650               TGAGGACAGCTATGAGGACATCTCTGCCTACCTGCTGAGCAAGAACAATG - 2700               CCATTGAGCCCAGGAGCTTCAGCCAGAATCCACCCGTCCTTAAGCGCCAT - 2750               CAGCGCGAGATCACCAGGACCACCCTGCAGTCTGACCAGGAGGAGATTGA - 2800               CTATGATGACACCATCTCTGTGGAGATGAAGAAGGAGGACTTTGACATCT - 2850               ACGACGAGGACGAGAACCAGAGCCCCAGGAGCTTCCAGAAGAAGACCAGG - 2900               CACTACTTCATTGCTGCTGTGGAGAGGCTGTGGGACTATGGCATGAGCAG - 2950               CAGCCCCCATGTGCTGAGGAACAGGGCCCAGTCTGGCTCTGTGCCCCAGT - 3000               TCAAGAAGGTGGTGTTCCAGGAGTTCACTGATGGCAGCTTCACCCAGCCC - 3050               CTGTACAGAGGGGAGCTGAATGAGCACCTGGGCCTGCTGGGCCCCTACAT - 3100               CAGGGCTGAGGTGGAGGACAACATCATGGTGACCTTCAGGAACCAGGCCA - 3150               GCAGGCCCTACAGCTTCTACAGCAGCCTGATCAGCTATGAGGAGGACCAG - 3200               AGGCAGGGGGCTGAGCCCAGGAAGAACTTTGTGAAGCCCAATGAAACCAA - 3250               GACCTACTTCTGGAAGGTGCAGCACCACATGGCCCCCACCAAGGATGAGT - 3300               TTGACTGCAAGGCCTGGGCCTACTTCTCTGATGTGGACCTGGAGAAGGAT - 3350               GTGCACTCTGGCCTGATTGGCCCCCTGCTGGTGTGCCACACCAACACCCT - 3400               GAACCCTGCCCATGGCAGGCAGGTGACTGTGCAGGAGTTTGCCCTGTTCT - 3450               TCACCATCTTTGATGAAACCAAGAGCTGGTACTTCACTGAGAACATGGAG - 3500               AGGAACTGCAGGGCCCCCTGCAACATCCAGATGGAGGACCCCACCTTCAA - 3550               GGAGAACTACAGGTTCCATGCCATCAATGGCTACATCATGGACACCCTGC - 3600               CTGGCCTGGTGATGGCCCAGGACCAGAGGATCAGGTGGTACCTGCTGAGC - 3650               ATGGGCAGCAATGAGAACATCCACAGCATCCACTTCTCTGGCCATGTGTT - 3700               CACTGTGAGGAAGAAGGAGGAGTACAAGATGGCCCTGTACAACCTGTACC - 3750               CTGGGGTGTTTGAGACTGTGGAGATGCTGCCCAGCAAGGCTGGCATCTGG - 3800               AGGGTGGAGTGCCTGATTGGGGAGCACCTGCATGCTGGCATGAGCACCCT - 3850               GTTCCTGGTGTACAGCAACAAGTGCCAGACCCCCCTGGGCATGGCCTCTG - 3900               GCCACATCAGGGACTTCCAGATCACTGCCTCTGGCCAGTATGGCCAGTGG - 3950               GCCCCCAAGCTGGCCAGGCTGCACTACTCTGGCAGCATCAATGCCTGGAG - 4000               CACCAAGGAGCCCTTCAGCTGGATCAAGGTGGACCTGCTGGCCCCCATGA - 4050               TCATCCATGGCATCAAGACCCAGGGGGCCAGGCAGAAGTTCAGCAGCCTG - 4100               TACATCAGCCAGTTCATCATCATGTACAGCCTGGATGGCAAGAAGTGGCA - 4150               GACCTACAGGGGCAACAGCACTGGCACCCTGATGGTGTTCTTTGGCAATG - 4200               TGGACAGCTCTGGCATCAAGCACAACATCTTCAACCCCCCCATCATTGCC - 4250               AGATACATCAGGCTGCACCCCACCCACTACAGCATCAGGAGCACCCTGAG - 4300               GATGGAGCTGATGGGCTGTGACCTGAACAGCTGCAGCATGCCCCTGGGCA - 4350               TGGAGAGCAAGGCCATCTCTGATGCCCAGATCACTGCCAGCAGCTACTTC - 4400               ACCAACATGTTTGCCACCTGGAGCCCCAGCAAGGCCAGGCTGCATCTGCA - 4450               GGGCAGGAGCAATGCCTGGAGGCCCCAGGTCAACAACCCCAAGGAGTGGC - 4500               TGCAGGTGGACTTCCAGAAGACCATGAAGGTGACTGGGGTGACCACCCAG - 4550               GGGGTGAAGAGCCTGCTGACCAGCATGTATGTGAAGGAGTTCCTGATCAG - 4600               CAGCAGCCAGGATGGCCACCAGTGGACCCTGTTCTTCCAGAATGGCAAGG - 4650               TGAAGGTGTTCCAGGGCAACCAGGACAGCTTCACCCCTGTGGTGAACAGC - 4700               CTGGACCCCCCCCTGCTGACCAGATACCTGAGGATTCACCCCCAGAGCTG - 4750               GGTGCACCAGATTGCCCTGAGGATGGAGGTGCTGGGCTGTGAGGCCCAGG - 4800               ACCTGTACTGAGGATCCAATAAAATATCTTTATTTTCATTACATCTGTGT - 4850               GTTGGTTTTTTGTGTGTTTTCCTGTAACGATCGGGCTCGAGCGC.            
SEQ ID NO:5 comprises (from 5′ to 3′) insulator (spacer) sequence Ins1 (nt 14-32 of SEQ ID NO:5), Serpin1 enhancer CRMSBS2 (nt 33-104 of SEQ ID NO:5), transthyretin minimal promoter TTRm (nt 117-339 of SEQ ID NO:5), SBR Intron3 (nt 340-432 of SEQ ID NO:5), FVIII coding sequence hF8 BDD (438-4811 of SEQ ID NO:5), SPA51 synthetic poly A sequence (nt 4818-4868 of SEQ ID NO:5), and insulator sequence Ins3 (nt 4869-4885 of SEQ ID NO:5), as described in PCT Publication No. WO 2017/074526.
 
     Construction of recombinant AAV vectors has been described in a number of publications, including U.S. Pat. No. 5,173,414; Tratschin et al.,  Mol. Cell. Biol.  5:3251-3260 (1985); Tratschin, et al.,  Mol. Cell. Biol.  4:2072-2081 (1984); Hermonat &amp; Muzyczka,  PNAS  81:6466-6470 (1984); and Samulski et al.,  J. Virol.  63:03822-3828 (1989). Efficient gene transfer and stable transgene delivery due to integration into the genomes of the transduced cell are features for this vector system. See, e.g., Wagner et al.,  Lancet  351:9117 1702-3 (1998), Kearns et al.,  Gene Ther.  9:748-55 (1996). 
     The effective amount of the AAV vector to be administered can vary from patient to patient. In some embodiments, effective amounts are determined by the physician administering the compositions (AAV vectors). Analysis of the serum, plasma or other tissue levels of the therapeutic polypeptide and comparison to the initial level prior to administration can determine whether the amount being administered is too low, within the right range or too high. Suitable regimes for initial and subsequent administrations are also variable, but are typified by an initial administration, optionally followed by subsequent administrations if necessary. Subsequent administrations may be administered at variable intervals, ranging from daily to annually to every several years. In some embodiments, appropriate immunosuppressive techniques may be recommended to avoid inhibition or blockage of transduction by immunosuppression of the delivery vectors. See, e.g., Vilquin et al., (1995)  Human Gene Ther.,  6:1391-1401. 
     Administration can be by any means. Both in vivo and ex vivo methods are contemplated. In some embodiments, intravenous injection (for example, though not limited to, via the portal vein) is the method of administration. In some embodiments, administration is through a standard intravenous administration. Other in vivo administration modes include, for example, direct injection into the lobes of the liver or the biliary duct and intravenous injection distal to the liver, including through the hepatic artery, direct injection in to the liver parenchyma, injection via the hepatic artery, and/or retrograde injection through the biliary tree. Ex vivo modes of administration include transduction in vitro of resected hepatocytes or other cells of the liver, followed by infusion of the transduced, resected hepatocytes back into the portal vasculature, liver parenchyma or biliary tree of the human patient, see e.g., Grossman et al., (1994)  Nature Genetics,  6:335-341. 
     Exemplary intravenous doses of an AAV vector as described herein can in some embodiments be between 6×10 11  to 1×10 13  or 3×10 13  or 1×10 13  to 1×10 14 , or 1×10 13  to 5×10 13 , or 2×10 13  to 4×10 13  vg/kg, e.g., from 1×10 12  or 2×10 12  to 3×10 13 , viral genomes/kilogram (vg/kg) of the human recipient. In some embodiments, the dosage is 1×10 11  to 1×10 12  vg/kg. In some embodiments, the dosage is 1×10 12  to 1×10 13  vg/kg or 3×10 13 . In some embodiments, the dosage is 2×10 12  to 3×10 13 . In some embodiments, the dosage is 5×10 12  to 5×10 13  vg/kg. As noted above, in some embodiments, the AAV vector is supplied to the recipient as a single dose. In some embodiments, the dosage is 6×10 11 , 9×10 11 , 1.2×10 12 , 2×10 12 , 4×10 12 , 6×10 12 , 1×10 13 , 3×10 13 , 4×10 13  or 5×10 13  vg/kg. In some embodiments, a patient receives a single dose of the AAV vector. 
     A pharmaceutically-acceptable carrier can be included as part of the formulation administered. Pharmaceutically acceptable carriers are determined in part by the particular composition being administered, as well as by the particular method used to administer the composition. Accordingly, there is a wide variety of suitable formulations of pharmaceutical compositions available, as described below (see, e.g.,  Remington&#39;s Pharmaceutical Sciences,  17th ed., 1989). 
     Formulations for both ex vivo and in vivo administrations can include suspensions (e.g., of genetically modified cells, liposomes or nanoparticles) in liquid or emulsified liquids. The active ingredients can be mixed with excipients that are pharmaceutically acceptable and compatible with the active ingredient. Suitable excipients include, for example, water, saline, dextrose, glycerol, ethanol or the like, and combinations thereof. In addition, the composition may contain minor amounts of auxiliary substances, such as, wetting or emulsifying agents, pH buffering agents, stabilizing agents or other reagents that enhance the effectiveness of the pharmaceutical composition. 
     Subjects receiving the described AAV vector can be any human. Exemplary recipients include for example individuals having hemophilia (for example hemophilia A). In some embodiments, a therapeutically effective amount, in reference to the treatment of hemophilia A or for use in a method for reducing bleeding time during a bleeding episode in a subject suffering from hemophilia A, refers to an amount capable of invoking one or more of the following effects: (1) reduction, inhibition, or prevention, to some extent, of one or more of the physiological symptoms of hemophilia A including, for example, bruising, joint pain or swelling, prolonged headache, vomiting or fatigue, (2) improvement in the capability to clot blood, (3) reduction of overall bleeding time during a bleeding episode, (4) administration resulting in a measurable increase in the concentration or activity of functional FVIII protein in the plasma of a subject, and/or (5) relief, to some extent, of one or more symptoms associated with the disorder. 
     In some embodiments, a FVIII blood concentration that is greater than 1% of factor concentration found in a normal individual results from administration of the AAV vector as described herein, thereby changing a severe disease phenotype to a moderate one. A severe phenotype is characterized by joint damage and life-threatening bleeds. In some embodiments, administration of the AAV vector as described herein results in a FVIII blood concentration of at least 5% of normal. In some embodiments, to convert a moderate disease phenotype into a mild one a FVIII blood concentration greater than 5% of normal is needed. FVIII levels in normal humans are about 1.14+−0.48 nM plasma, for example, by an activated partial thromboplastin time (aPTT) one-stage clotting assay (see, e.g., Butenas, et al.,  Thromb Res . (2010 August); 126(2): 119-123). Thus, a therapeutic effect can be achieved by expression of FVIII such that the total amount of FVIII in the subject/human is greater than 1% of the FVIII present in normal subjects/humans, e.g., 1% of 1.14+−0.48 nM. 
     In some embodiments, prior to the administrating the human had less than 1%, 2%, 3%, 4%, or 5% of normal human circulating FVIII activity and within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administrating the human has at least 1%, 2%, 3%, 4%, or 5%, respectively, of normal human circulating FVIII activity In some embodiments, administration of an AAV vector as described herein results in an increase in functional FVIII protein activity in the plasma of the human recipient of at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or more IU/dl as compared to the amount of functional FVIII protein activity present in the plasma in the subject prior (e.g., within 14 days before administration) to administration. In some embodiments, administration of an AAV vector as described herein results in the expression of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more IU/dl of circulating FVIII activity in the plasma of the subject. In this regard, the term “IU” or “international unit” in regards to FVIII activity is a commonly-understood term, wherein 1 IU of FVIII activity is equivalent to the quantity of FVIII in one ml of normal human plasma. In some embodiments, normal human FVIII activity is 0.500-1.500 IU/ml plasma. The World Health Organization describes levels of severity of hemophilia as follows: 
     
       
         
           
               
               
               
             
               
                   
               
               
                   
                 Percentage of normal factor 
                 Number of 
               
               
                   
                 activity in blooPercentage of 
                 international 
               
               
                   
                 normal factor activity in 
                 units (IU) per millilitre  
               
               
                 Level 
                 blood 
                 (ml) of whole blood 
               
               
                   
               
             
            
               
                 normal range 
                 50%-150% 
                 0.50-1.5 IU 
               
               
                 mild hemophilia 
                  5%-40% 
                 0.05-0.40 IU 
               
               
                 moderate hemophilia 
                  1%-5% 
                 0.01-0.05 IU 
               
               
                 severe hemophilia 
                 less than 1% 
                 less than 0.01 IU 
               
               
                   
               
            
           
         
       
     
     FVIII activity in the plasma may be quantitatively determined by a number of well-known and accepted assays including, for example, the activated partial thromboplastin time (APPT) method (see, e.g., Miletich J P: Activated partial thromboplastin time. In Williams Hematology. Fifth edition. Edited by E Beutler, M A Lichtman, B A Coller, T J Kipps. New York, McGraw-Hill, 1995, pp L85-86, Greaves and Preston, Approach to the bleeding patient.  In Hemostasis and Thrombosis: Basic Principles and Clinical Practice . Fourth edition. Edited by R W Colman, J Hirsh, V J Marder, et al. Philadelphia, JB Lippincott Co, 2001, pp 1197-1234 and Olson et al,  Arch. Pathol. Lab. Med.  122:782-798 (1998)) or chromogenic FXa assay (Harris et al.,  Thromb. Res.  128(6): 125-129 (2011)). 
     In other embodiments, bleeding time in a subject may be measured by well-known and accepted techniques including, for example, the Ivy method (see, e.g., Ivy et al.,  Surg. Gynec. Obstet.  60:781 (1935) and Ivy et al.,  J. Lab. Clin. Med.  26: 1812 (1941)) or the Duke method (see, e.g., Duke et al.,  JAMA  55: 1185 (1910)). A “bleeding episode” in a subject refers to an injury that results in bleeding in the subject, either externally or internally, and generally comprises the time period from injury to formation of a blood clot. In some embodiments, the frequency of bleeding episodes is reduced in a subject after the administering of the AAV vectors described herein. In some embodiments, the frequency of bleeding episodes is reduced 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% after the administering. 
     In some embodiments, the concentration of FVIII protein in blood of the human is measured before, after, or before and after the administrating. Direct or indirect assays for measuring FVIII blood concentration can be used. Exemplary indirect methods include for example those described in Over, J. (1986)  Scand. J Haematol.  33 (Suool. 41), 13-24; Kemball-Cook, G., et al. (1993)  Brit. J. Haematol.  84, 273-278. Direct detection methods include those described in, e.g., U.S. Pat. No. 8,715,951. In some embodiments, the FVIII blood concentration is determined within two weeks before the initial administration of the AAV vector to best determine the effect after administration. 
     In some embodiments, administration and treatment with the AAV vectors described herein will cause a reduction in the need for treatment with replacement Factor VIII protein by the subject. This can be measured by noting the frequency of need for treatment prior to administration of the AAV vectors described herein, and then noting the frequency of need for treatment after administering. In some embodiments, the reduction in need for treatment is 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100% reduced after the administering. 
     In some embodiments, administration and treatment with the AAV vectors described herein cause little or no harm to the liver. Liver status can be measured, for example, by measuring one or more markers in the blood of the individual. Exemplary markers indicative of liver health include but are not limited to Alanine aminotransferase (ALT) or aspartate aminotransferase (AST)) bilirubin, alkaline phosphatase, and albumin. In some embodiments, the human displays no more than 1.0, 1.2, 1.5, 1.7, or 2.0 times upper limit of normal (ULN) of at least one of alanine aminotransferase (ALT), aspartate aminotransferase (AST), bilirubin, alkaline phosphatase, or albumin within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks of the administering. The ULN can generally be determined from a population. See, e.g., Neuschwander-Tetri, B., et al.,  Arch Intern Med.  2004 Mar. 24; 168(6): 663-666 discussing for ALT. In some embodiments, the ULN for ALT is 44 U/L. In some embodiments, the ULN for AST is 39 U/L. In some embodiments, the ULN for bilirubin is 0.1-1.0 mg/dl for total bilirubin 0.2-0.7 mg/dl for conjugated bilirubin and 0.1-0.4 mg/dl for unconjugated bilirubin. See, e.g., Lisa B, VanWagner (2015).  Journal of American Medical Association  ( JAMA ) 313 (5): 516-517. In some embodiments, the ULN for alkaline phosphatase is 129 or 133 U/L. See, e.g., Gowda, et al.,  Pan Afr Med J . (2009) 3:17. In some embodiments, the normal range for albumin is 35-55 g/liter (Burtis and Ashwood (1999)  Tietz Textbook of Clinical Chemistry,  3 rd  edition. Saunders Editor). 
     In some embodiments, administration and treatment with the AAV vectors described herein do not result in detectable levels of FVIII inhibitor, for example at any one or more of time points: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administrating. FVIII inhibitors are detected by the Nijmegen-Bethesda assay (Duncan, et al.,  Methods Mol Biol.  2013; 992:321-33 and Miller C H, et al.  Am J Hematol.  90:871-876 (2015)). The limit of detection of this assay is 0.6 BU. Any result under 0.6 BU is considered undetectable. 
     In some embodiments, administration and treatment with the AAV vectors described herein do not significantly affect expression of certain biomarkers and ideally result in improved results for the biomarkers. Exemplary biomarkers include, e.g., Von Willebrand factor (vWF), soluble epidermal growth factor receptor (sEGFR), Galectin-3-binding protein (GAL3BP), C-reactive protein (CRP), IL-6, circulating alpha fetoprotein. In some embodiments, one or more of the above-listed biomarkers are measured in the individual&#39;s blood prior to or after administration or both. In some embodiments, the blood level of one or more of the biomarkers when assayed within 2, 4, 6, 8, 10, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, or 52 weeks after the administering is no more than 1.0, 1.2, 1.5, 1.7, or 2.0 times a level within two weeks prior to the administering. 
     General 
     Practice of the methods, as well as preparation and use of the compositions disclosed herein employ, unless otherwise indicated, conventional techniques in molecular biology, biochemistry, chromatin structure and analysis, computational chemistry, cell culture, recombinant DNA and related fields as are within the skill of the art. These techniques are fully explained in the literature. See, for example, Sambrook et al. MOLECULAR CLONING: A LABORATORY MANUAL, Second edition, Cold Spring Harbor Laboratory Press, 1989 and Third edition, 2001; Ausubel et al., CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley &amp; Sons, New York, 1987 and periodic updates; the series METHODS IN ENZYMOLOGY, Academic Press, San Diego; Wolfe, CHROMATIN STRUCTURE AND FUNCTION, Third edition, Academic Press, San Diego, 1998; METHODS IN ENZYMOLOGY, Vol. 304, “Chromatin” (P. M. Wassarman and A. P. Wolffe, eds.), Academic Press, San Diego, 1999; and METHODS IN MOLECULAR BIOLOGY, Vol. 119, “Chromatin Protocols” (P. B. Becker, ed.) Humana Press, Totowa, 1999. 
     Definitions 
     The terms “nucleic acid,” “polynucleotide,” and “oligonucleotide” are used interchangeably and refer to a deoxyribonucleotide or ribonucleotide polymer, in linear or circular conformation, and in either single- or double-stranded form. For the purposes of the present disclosure, these terms are not to be construed as limiting with respect to the length of a polymer. The terms can encompass known analogues of natural nucleotides, as well as nucleotides that are modified in the base, sugar and/or phosphate moieties (e.g., phosphorothioate backbones). In general, an analogue of a particular nucleotide has the same base-pairing specificity; i.e., an analogue of A will base-pair with T. 
     The terms “polypeptide,” “peptide” and “protein” are used interchangeably to refer to a polymer of amino acid residues. The term also applies to amino acid polymers in which one or more amino acids are chemical analogues or modified derivatives of a corresponding naturally-occurring amino acids. 
     In any of the methods described herein, the exogenous nucleotide sequence (the “expression construct” or “expression cassette” or “vector”) can contain sequences that are homologous, but not identical, to genomic sequences in the region of interest, thereby stimulating homologous recombination to insert a non-identical sequence in the region of interest. Thus, in certain embodiments, portions of the expression cassette sequence that are homologous to sequences in the region of interest exhibit between about 80 to 99% (or any integer therebetween) sequence identity to the genomic sequence that is replaced. In other embodiments, the homology between the expression cassette and genomic sequence is higher than 99%, for example if only 1 nucleotide differs as between the homology regions of the expression cassette and genomic sequences of over 100 contiguous base pairs. In certain cases, a non-homologous portion of the expression cassette can contain sequences not present in the region of interest, such that new sequences are introduced into the region of interest. In these instances, the non-homologous sequence is generally flanked by sequences of 50-1,000 base pairs (or any integral value therebetween) or any number of base pairs greater than 1,000, that are homologous or identical to sequences in the region of interest. 
     The term “sequence” refers to a nucleotide sequence of any length, which can be DNA or RNA; can be linear, circular or branched and can be either single-stranded or double stranded. The term “transgene” refers to a nucleotide sequence that is inserted into a genome. A transgene can be of any length, for example between 2 and 100,000,000 nucleotides in length (or any integer value therebetween or thereabove), preferably between about 100 and 100,000 nucleotides in length (or any integer therebetween), more preferably between about 2000 and 20,000 nucleotides in length (or any value therebetween) and even more preferable, between about 5 and 15 kb (or any value therebetween). 
     A “chromosome,” is a chromatin complex comprising all or a portion of the genome of a cell. The genome of a cell is often characterized by its karyotype, which is the collection of all the chromosomes that comprise the genome of the cell. The genome of a cell can comprise one or more chromosomes. 
     An “episome” is a replicating nucleic acid, nucleoprotein complex or other structure comprising a nucleic acid that is not part of the chromosomal karyotype of a cell. Examples of episomes include plasmids and certain viral genomes. The liver specific constructs described herein may be epiosomally maintained or, alternatively, may be stably integrated into the cell. 
     An “exogenous” molecule is a molecule that is not normally present in a cell, but can be introduced into a cell by one or more genetic, biochemical or other methods. “Normal presence in the cell” is determined with respect to the particular developmental stage and environmental conditions of the cell. Thus, for example, a molecule that is present only during embryonic development of muscle is an exogenous molecule with respect to an adult muscle cell. Similarly, a molecule induced by heat shock is an exogenous molecule with respect to a non-heat-shocked cell. An exogenous molecule can comprise, for example, a functioning version of a malfunctioning endogenous molecule or a malfunctioning version of a normally-functioning endogenous molecule. 
     An exogenous molecule can be, among other things, a small molecule, such as is generated by a combinatorial chemistry process, or a macromolecule such as a protein, nucleic acid, carbohydrate, lipid, glycoprotein, lipoprotein, polysaccharide, any modified derivative of the above molecules, or any complex comprising one or more of the above molecules. Nucleic acids include DNA and RNA, can be single- or double-stranded; can be linear, branched or circular; and can be of any length. Nucleic acids include those capable of forming duplexes, as well as triplex-forming nucleic acids. See, for example, U.S. Pat. Nos. 5,176,996 and 5,422,251. Proteins include, but are not limited to, DNA-binding proteins, transcription factors, chromatin remodeling factors, methylated DNA binding proteins, polymerases, methylases, demethylases, acetylases, deacetylases, kinases, phosphatases, ligases, deubiquitinases, integrases, recombinases, ligases, topoisomerases, gyrases and helicases. 
     An exogenous molecule can be the same type of molecule as an endogenous molecule, e.g., an exogenous protein or nucleic acid. For example, an exogenous nucleic acid can comprise an infecting viral genome, a plasmid or episome introduced into a cell, or a chromosome that is not normally present in the cell. Methods for the introduction of exogenous molecules into cells are known to those of skill in the art and include, but are not limited to, lipid-mediated transfer (i.e., liposomes, including neutral and cationic lipids), electroporation, direct injection, cell fusion, particle bombardment, calcium phosphate co-precipitation, DEAE-dextran-mediated transfer and viral vector-mediated transfer. An exogenous molecule can also be the same type of molecule as an endogenous molecule but derived from a different species than the cell is derived from. For example, a human nucleic acid sequence may be introduced into a cell line originally derived from a mouse or hamster. Methods for the introduction of exogenous molecules into plant cells are known to those of skill in the art and include, but are not limited to, protoplast transformation, silicon carbide (e.g., WHISKERS™),  Agrobacterium -mediated transformation, lipid-mediated transfer (i.e., liposomes, including neutral and cationic lipids), electroporation, direct injection, cell fusion, particle bombardment (e.g., using a “gene gun”), calcium phosphate co-precipitation, DEAE-dextran-mediated transfer and viral vector-mediated transfer. 
     By contrast, an “endogenous” molecule is one that is normally present in a particular cell at a particular developmental stage under particular environmental conditions. For example, an endogenous nucleic acid can comprise a chromosome, the genome of a mitochondrion, chloroplast or other organelle, or a naturally-occurring episomal nucleic acid. Additional endogenous molecules can include proteins, for example, transcription factors and enzymes. 
     As used herein, the term “product of an exogenous nucleic acid” includes both polynucleotide and polypeptide products, for example, transcription products (polynucleotides such as RNA) and translation products (polypeptides). 
     A “gene,” for the purposes of the present disclosure, includes a DNA region encoding a gene product (see infra), as well as all DNA regions which regulate the production of the gene product, whether or not such regulatory sequences are adjacent to coding and/or transcribed sequences. Accordingly, a gene includes, but is not necessarily limited to, promoter sequences, terminators, translational regulatory sequences such as ribosome binding sites and internal ribosome entry sites, enhancers, silencers, insulators, boundary elements, replication origins, matrix attachment sites and locus control regions. 
     “Gene expression” refers to the conversion of the information, contained in a gene, into a gene product. A gene product can be the direct transcriptional product of a gene (e.g., mRNA, tRNA, rRNA, antisense RNA, ribozyme, structural RNA or any other type of RNA) or a protein produced by translation of an mRNA. Gene products also include RNAs which are modified, by processes such as capping, polyadenylation, methylation, and editing, and proteins modified by, for example, methylation, acetylation, phosphorylation, ubiquitination, ADP-ribosylation, myristilation, and glycosylation. 
     “Modulation” of gene expression refers to a change in the activity of a gene. Modulation of expression can include, but is not limited to, gene activation and gene repression. Genome editing (e.g., cleavage, alteration, inactivation, random mutation) can be used to modulate expression. Gene inactivation refers to any reduction in gene expression as compared to a cell that does not include a ZFP, TALE or CRISPR/Cas system as described herein. Thus, gene inactivation may be partial or complete. 
     “Eukaryotic” cells include, but are not limited to, fungal cells (such as yeast), plant cells, animal cells, mammalian cells and human cells (e.g., T-cells), including stem cells (pluripotent and multipotent). 
     The terms “operative linkage” and “operatively linked” (or “operably linked”) are used interchangeably with reference to a juxtaposition of two or more components (such as sequence elements), in which the components are arranged such that both components function normally and allow the possibility that at least one of the components can mediate a function that is exerted upon at least one of the other components. By way of illustration, a transcriptional regulatory sequence, such as a promoter, is operatively linked to a coding sequence if the transcriptional regulatory sequence controls the level of transcription of the coding sequence in response to the presence or absence of one or more transcriptional regulatory factors. A transcriptional regulatory sequence is generally operatively linked in cis with a coding sequence, but need not be directly adjacent to it. For example, an enhancer is a transcriptional regulatory sequence that is operatively linked to a coding sequence, even though they are not contiguous. 
     A “functional fragment” of a protein, polypeptide or nucleic acid is a protein, polypeptide or nucleic acid whose sequence is not identical to the full-length protein, polypeptide or nucleic acid, yet retains the same function as the full-length protein, polypeptide or nucleic acid. A functional fragment can possess more, fewer, or the same number of residues as the corresponding native molecule, and/or can contain one or more amino acid or nucleotide substitutions. Methods for determining the function of a nucleic acid (e.g., coding function, ability to hybridize to another nucleic acid) are well-known in the art. Similarly, methods for determining protein function are well-known. For example, the B-domain deleted human Factor VIII is a functional fragment of the full-length Factor VIII protein. 
     A polynucleotide “vector” or “construct” is capable of transferring gene sequences to target cells. Typically, “vector construct,” “expression vector,” “expression construct,” “expression cassette,” and “gene transfer vector,” mean any nucleic acid construct capable of directing the expression of a gene of interest and which can transfer gene sequences to target cells. Thus, the term includes cloning, and expression vehicles, as well as integrating vectors. 
     The terms “subject” and “patient” are used interchangeably and refer to mammals such as human patients and non-human primates, as well as experimental animals such as rabbits, dogs, cats, rats, mice, and other animals. Accordingly, the term “subject” or “patient” as used herein means any mammalian patient or subject to which the expression cassettes of the invention can be administered. Subjects of the present invention include those with a disorder. 
     The terms “treating” and “treatment” as used herein refer to reduction in severity and/or frequency of symptoms, elimination of symptoms and/or underlying cause, prevention of the occurrence of symptoms and/or their underlying cause, and improvement or remediation of damage. Cancer and graft versus host disease are non-limiting examples of conditions that may be treated using the compositions and methods described herein. Thus, “treating” and “treatment includes: 
     (i) preventing the disease or condition from occurring in a mammal, in particular, when such mammal is predisposed to the condition but has not yet been diagnosed as having it; 
     (ii) inhibiting the disease or condition, i.e., arresting its development; 
     (iii) relieving the disease or condition, i.e., causing regression of the disease or condition; and/or 
     (iv) relieving or eliminating the symptoms resulting from the disease or condition, i.e., relieving pain with or without addressing the underlying disease or condition. 
     As used herein, the terms “disease” and “condition” may be used interchangeably or may be different in that the particular malady or condition may not have a known causative agent (so that etiology has not yet been worked out) and it is therefore not yet recognized as a disease but only as an undesirable condition or syndrome, wherein a more or less specific set of symptoms have been identified by clinicians. 
     A “pharmaceutical composition” refers to a formulation of a compound of the invention and a medium generally accepted in the art for the delivery of the biologically active compound to mammals, e.g., humans. Such a medium includes all pharmaceutically acceptable carriers, diluents or excipients therefor. 
     “Effective amount” or “therapeutically effective amount” refers to that amount of a compound of the invention which, when administered to a mammal, preferably a human, is sufficient to effect treatment in the mammal, preferably a human. The amount of a composition of the invention which constitutes a “therapeutically effective amount” will vary depending on the compound, the condition and its severity, the manner of administration, and the age of the mammal to be treated, but can be determined routinely by one of ordinary skill in the art having regard to his own knowledge and to this disclosure. 
     Liver-Specific Expression Constructs 
     Also described herein are expression cassettes (constructs) for use in directing expression of a transgene in a liver cell, including in vivo following administration of the expression cassette(s) to the subject (e.g., hepatic delivery). The expression construct may be maintained episomally and drive expression of the transgene extrachromosomally or, alternatively, the expression construct may be integrated into the genome of a liver cell, for example by nuclease-mediated targeted integration. 
     The polynucleotide expression construct comprises an enhancer sequence, a promoter sequence, and one or more transgenes. Optionally included are one or more of the following: an intronic sequence, a polyadenylation sequence and/or a signal peptide. Any enhancer sequence may be used in the expression constructs described herein. In certain embodiments, the enhancer is a wild-type or modified Serpin1 enhancer (Chuah et al., (2014)  Molecular Therapy,  22, 1605-1613; Nair et al., (2014)  Blood,  123, 3195-3199) 
     As will be apparent, any transgene can be used in the constructs described herein. Furthermore, the individual components (promoter, enhancer, insulator, transgene, etc.) of the constructs described herein may be mixed and matched in any combination. 
     The constructs described herein may be contained within any viral or non-viral vector. The constructs may be maintained episomally or may be integrated into the genome of the cell (e.g., via nuclease-mediated targeted integration). 
     Non-viral vectors include DNA or RNA plasmids, DNA MCs, naked nucleic acid, and nucleic acid complexed with a delivery vehicle such as a liposome, nanoparticle or poloxamer. Viral vectors that may be used to carry the expression cassettes described herein include, but are not limited to, retroviral, lentivirus, adenoviral, adeno-associated viral vectors, vaccinia and herpes simplex virus vectors. Integration in the host genome is possible with the retrovirus, lentivirus, and adeno-associated virus gene transfer methods, and as described herein may be facilitated by nuclease-mediated integration. 
     In certain embodiments, the constructs are included in an adeno-associated virus (“AAV”) vector or vector system that may be maintained episomally or integrated into the genome of a liver cell (e.g., via nuclease-mediated targeted integration). Construction of recombinant AAV vectors is in a number of publications, including U.S. Pat. No. 5,173,414; Tratschin et al.,  Mol. Cell. Biol.  5:3251-3260 (1985); Tratschin, et al.,  Mol. Cell. Biol.  4:2072-2081 (1984);  Hermonat  &amp;  Muzyczka, PNAS  81:6466-6470 (1984); and Samulski et al.,  J. Virol.  63:03822-3828 (1989). 
     Thus, in certain embodiments, the expression construct is carried on an AAV construct and further comprises 5′ and 3′ ITRs flanking the expression constructs elements (e.g., enhancer, promoter, optional intron, transgene, etc.) as described herein. Optionally, spacer molecules are also included between one or more of the components of the expression construct, for example, between the 5′ ITR and the enhancer and/or between the polyadenylation signal and the 3′ ITR. The spacers may function as homology arms to facilitate recombination into a safe-harbor locus (e.g. albumin). 
     In certain embodiments, the AAV vectors as described herein can be derived from any AAV. In certain embodiments, the AAV vector is derived from the defective and nonpathogenic parvovirus adeno-associated type 2 virus. All such vectors are derived from a plasmid that retains only the AAV 145 bp inverted terminal repeats flanking the transgene expression cassette. Efficient gene transfer and stable transgene delivery due to integration into the genomes of the transduced cell are key features for this vector system. (Wagner et al.,  Lancet  351:9117 1702-3 (1998), Kearns et al.,  Gene Ther.  9:748-55 (1996)). Other AAV serotypes, including AAV1, AAV2, AAV3, AAV4, AAV5, AAV6, AAV7, AAV8, AAV9 and AAVrh.10 and any novel AAV serotype can also be used in accordance with the present invention. In some embodiments, chimeric AAV is used where the viral origins of the LTR sequences of the viral nucleic acid are heterologous to the viral origin of the capsid sequences. Non-limiting examples include chimeric virus with LTRs derived from AAV2 and capsids derived from AAV5, AAV6, AAV8 or AAV9 (i.e. AAV2/5, AAV2/6, AAV2/8 and AAV2/9, respectively). 
     Packaging cells are used to form virus particles that are capable of infecting a host cell. Such cells include HEK293 and Sf9 cells, which can be used to package AAV and adenovirus, and ψ2 cells or PA317 cells, which package retrovirus. Viral vectors used in gene therapy are usually generated by a producer cell line that packages a nucleic acid vector into a viral particle. The vectors typically contain the minimal viral sequences required for packaging and subsequent integration into a host (if applicable), other viral sequences being replaced by an expression cassette encoding the protein to be expressed. The missing viral functions are supplied in trans by the packaging cell line. For example, AAV vectors used in gene therapy typically only possess inverted terminal repeat (ITR) sequences from the AAV genome which are required for packaging and integration into the host genome. Viral DNA is packaged in a cell line, which contains a helper plasmid encoding the other AAV genes, namely rep and cap, but lacking ITR sequences. The cell line is also infected with adenovirus as a helper. The helper virus promotes replication of the AAV vector and expression of AAV genes from the helper plasmid. The helper plasmid is not packaged in significant amounts due to a lack of ITR sequences. Contamination with adenovirus can be reduced by, e.g., heat treatment to which adenovirus is more sensitive than AAV. In some embodiments, AAV is produced using a baculovirus expression system. 
     In many gene therapy applications, it is desirable that the gene therapy vector be delivered with a high degree of specificity to a particular tissue type. Accordingly, a viral vector can be modified to have specificity for a given cell type by expressing a ligand as a fusion protein with a viral coat protein on the outer surface of the virus. The ligand is chosen to have affinity for a receptor known to be present on the cell type of interest. For example, Han et al.,  Proc. Natl. Acad. Sci. USA  92:9747-9751 (1995), reported that Moloney murine leukemia virus can be modified to express human heregulin fused to gp70, and the recombinant virus infects certain human breast cancer cells expressing human epidermal growth factor receptor. This principle can be extended to other virus-target cell pairs, in which the target cell expresses a receptor and the virus expresses a fusion protein comprising a ligand for the cell-surface receptor. For example, filamentous phage can be engineered to display antibody fragments (e.g., FAB or Fv) having specific binding affinity for virtually any chosen cellular receptor. Although the above description applies primarily to viral vectors, the same principles can be applied to nonviral vectors. Such vectors can be engineered to contain specific uptake sequences which favor uptake by specific target cells. 
     The polynucleotides described herein may include one or more non-natural bases and/or backbones. In particular, an expression cassette as described herein may include methylated cytosines to achieve a state of transcriptional quiescence in a region of interest. 
     Furthermore, the expression constructs as described herein may also include additional transcriptional or translational regulatory or other sequences, for example, Kozak sequences, additional promoters, enhancers, insulators, internal ribosome entry sites, sequences encoding 2A peptides, furin cleavage sites and/or polyadenylation signals. Further, the control elements of the genes of interest can be operably linked to reporter genes to create chimeric genes (e.g., reporter expression cassettes). 
     Delivery 
     The constructs described herein may be delivered in vivo or ex vivo by any suitable means into any cell type, preferably to the liver (hepatic delivery). Similarly, when used in combination with nucleases for targeted integration, the nucleases may be delivered in polynucleotide and/or protein form, for example using non-viral vector(s), viral vectors(s) and/or in RNA form, e.g., as mRNA. 
     Conventional viral and non-viral based gene transfer methods can be used to introduce nucleic acids encoding engineered gene modulators in cells (e.g., mammalian cells) and target tissues. Such methods can also be used to administer nucleic acids encoding such repressors (or components thereof) to cells in vitro. In certain embodiments, nucleic acids encoding the repressors are administered for in vivo or ex vivo gene therapy uses. Non-viral vector delivery systems include DNA plasmids, naked nucleic acid, and nucleic acid complexed with a delivery vehicle such as a liposome or poloxamer. Viral vector delivery systems include DNA and RNA viruses, which have either episomal or integrated genomes after delivery to the cell. For a review of gene therapy procedures, see Anderson,  Science  256:808-813 (1992); Nabel &amp; Felgner,  TIBTECH  11:211-217 (1993); Mitani &amp; Caskey,  TIBTECH  11:162-166 (1993); Dillon,  TIBTECH  11:167-175 (1993); Miller,  Nature  357:455-460 (1992); Van Brunt,  Biotechnology  6(10):1149-1154 (1988); Vigne,  Restorative Neurology and Neuroscience  8:35-36 (1995); Kremer &amp; Perricaudet,  British Medical Bulletin  51(1):31-44 (1995); Haddada et al., in  Current Topics in Microbiology and Immunology  Doerfler and Bohm (eds.) (1995); and Yu et al.,  Gene Therapy  1:13-26 (1994). 
     Any vector systems may be used including, but not limited to, plasmid vectors, retroviral vectors, lentiviral vectors, adenovirus vectors, poxvirus vectors; herpesvirus vectors and adeno-associated virus vectors, etc. See, also, U.S. Pat. Nos. 8,586,526; 6,534,261; 6,607,882; 6,824,978; 6,933,113; 6,979,539; 7,013,219; and 7,163,824, incorporated by reference herein in their entireties. 
     Methods of non-viral delivery of nucleic acids include electroporation, lipofection, microinjection, biolistics, virosomes, liposomes, immunoliposomes, other nanoparticle, polycation or lipid:nucleic acid conjugates, naked DNA, artificial virions, and agent-enhanced uptake of DNA. Sonoporation using, e.g., the Sonitron 2000 system (Rich-Mar) can also be used for delivery of nucleic acids. Additional exemplary nucleic acid delivery systems include those provided by AmaxaBiosystems (Cologne, Germany), Maxcyte, Inc. (Rockville, Md.), BTX Molecular Delivery Systems (Holliston, Mass.) and Copernicus Therapeutics Inc., (see for example U.S. Pat. No. 6,008,336). 
     In some embodiments, the expression constructs are AAV vectors. The optional nucleases may be administered in mRNA form or using one or more viral vectors (AAV, Ad, etc.). Administration can be by any means in which the polynucleotides are delivered to the desired target cells. Both in vivo and ex vivo methods are contemplated. Intravenous injection to the portal vein is a possible method of administration. Other in vivo administration modes include, for example, direct injection into the lobes of the liver or the biliary duct and intravenous injection distal to the liver, including through the hepatic artery, direct injection in to the liver parenchyma, injection via the hepatic artery, and/or retrograde injection through the biliary tree. Ex vivo modes of administration include transduction in vitro of resected hepatocytes or other cells of the liver, followed by infusion of the transduced, resected hepatocytes back into the portal vasculature, liver parenchyma or biliary tree of the human patient, see e.g., Grossman et al., (1994)  Nature Genetics,  6:335-341. 
     In systems involving delivery of more than one polynucleotides (e.g., construct as described herein and nuclease in polynucleotide form), the two or more polynucleotide(s) are delivered using one or more of the same and/or different vectors. For example, the nuclease in polynucleotide form may be delivered in mRNA form and the liver-specific constructs as described herein may be delivered via other modalities such as viral vectors (e.g., AAV), minicircle DNA, plasmid DNA, linear DNA, liposomes, nanoparticles and the like. 
     Additional exemplary nucleic acid delivery systems include those provided by Amaxa Biosystems (Cologne, Germany), Maxcyte, Inc. (Rockville, Md.), BTX Molecular Delivery Systems (Holliston, Mass.) and Copernicus Therapeutics Inc, (see for example U.S. Pat. No. 6,008,336). Lipofection is described in e.g., U.S. Pat. Nos. 5,049,386; 4,946,787; and 4,897,355) and lipofection reagents are sold commercially (e.g., Transfectam® and Lipofectin® and Lipofectamine® RNAiMAX). Cationic and neutral lipids that are suitable for efficient receptor-recognition lipofection of polynucleotides include those of Felgner, WO 91/17424, WO 91/16024. Delivery can be to cells (ex vivo administration) or target tissues (in vivo administration). 
     The preparation of lipid:nucleic acid complexes, including targeted liposomes such as immunolipid complexes, is well known to one of skill in the art (see, e.g., Crystal, Science 270:404-410 (1995); Blaese et al., Cancer Gene Ther. 2:291-297 (1995); Behr et al., Bioconjugate Chem. 5:382-389 (1994); Remy et al., Bioconjugate Chem. 5:647-654 (1994); Gao et al., Gene Therapy 2:710-722 (1995); Ahmad et al., Cancer Res. 52:4817-4820 (1992); U.S. Pat. Nos. 4,186,183, 4,217,344, 4,235,871, 4,261,975, 4,485,054, 4,501,728, 4,774,085, 4,837,028, and 4,946,787). 
     Additional methods of delivery include the use of packaging the nucleic acids to be delivered into EnGeneIC delivery vehicles (EDVs). These EDVs are specifically delivered to target tissues using bispecific antibodies where one arm of the antibody has specificity for the target tissue and the other has specificity for the EDV. The antibody brings the EDVs to the target cell surface and then the EDV is brought into the cell by endocytosis. Once in the cell, the contents are released (see MacDiarmid et al (2009) Nature Biotechnology 27(7):643). 
     In applications in which transient expression is desired, adenoviral based systems can be used. Adenoviral based vectors are capable of very high transduction efficiency in many cell types and do not require cell division. With such vectors, high titer and high levels of expression have been obtained. This vector can be produced in large quantities in a relatively simple system. Adeno-associated virus (“AAV”) vectors are also used to transduce cells with target nucleic acids, e.g., in the in vitro production of nucleic acids and peptides, and for in vivo and ex vivo gene therapy procedures (see, e.g., West et al.,  Virology  160:38-47 (1987); U.S. Pat. No. 4,797,368; WO 93/24641; Kotin,  Human Gene Therapy  5:793-801 (1994); Muzyczka,  J. Clin. Invest.  94:1351 (1994). Construction of recombinant AAV vectors are described in a number of publications, including U.S. Pat. No. 5,173,414; Tratschin et al.,  Mol. Cell. Biol.  5:3251-3260 (1985); Tratschin, et al.,  Mol. Cell. Biol.  4:2072-2081 (1984); Hermonat &amp; Muzyczka,  PNAS  81:6466-6470 (1984); and Samulski et al.,  J. Virol.  63:03822-3828 (1989). 
     Recombinant adeno-associated virus vectors (rAAV) are a promising alternative gene delivery systems based on the defective and nonpathogenic parvovirus adeno-associated type 2 virus. All vectors are derived from a plasmid that retains only the AAV 145 bp inverted terminal repeats flanking the transgene expression cassette. Efficient gene transfer and stable transgene delivery due to integration into the genomes of the transduced cell are key features for this vector system. (Wagner et al.,  Lancet  351:9117 1702-3 (1998), Kearns et al.,  Gene Ther.  9:748-55 (1996)). Other AAV serotypes, including AAV1, AAV2, AAV3, AAV4, AAV5, AAV6, AAV8AAV 8.2, AAV9, and AAV rh10 and pseudotyped AAV such as AAV2/8, AAV2/9, AAV2/5 and AAV2/6 can also be used in accordance with the present invention. Novel AAV serotypes capable of crossing the blood-brain barrier can also be used in accordance with the present invention (see e.g. US20150079038). In some embodiments, AAV6 is used. 
     Packaging cells are used to form virus particles that are capable of infecting a host cell. Such cells include 293 cells, which package adenovirus, and ψ2 cells or PA317 cells, which package retrovirus. Viral vectors used in gene therapy are usually generated by a producer cell line that packages a nucleic acid vector into a viral particle. The vectors typically contain the minimal viral sequences required for packaging and subsequent integration into a host (if applicable), other viral sequences being replaced by an expression cassette encoding the protein to be expressed. The missing viral functions are supplied in trans by the packaging cell line. For example, AAV vectors used in gene therapy typically only possess inverted terminal repeat (ITR) sequences from the AAV genome which are required for packaging and integration into the host genome. Viral DNA is packaged in a cell line, which contains a helper plasmid encoding the other AAV genes, namely rep and cap, but lacking ITR sequences. The cell line is also infected with adenovirus as a helper. The helper virus promotes replication of the AAV vector and expression of AAV genes from the helper plasmid. The helper plasmid is not packaged in significant amounts due to a lack of ITR sequences. Contamination with adenovirus can be reduced by, e.g., heat treatment to which adenovirus is more sensitive than AAV. 
     Purification of AAV particles from a 293 or baculovirus system typically involves growth of the cells which produce the virus, followed by collection of the viral particles from the cell supernatant or lysing the cells and collecting the virus from the crude lysate. AAV is then purified by methods known in the art including ion exchange chromatography (e.g. see U.S. Pat. Nos. 7,419,817 and 6,989,264), ion exchange chromatography and CsCl density centrifugation (e.g. PCT publication WO2011094198A10), immunoaffinity chromatography (e.g. WO2016128408) or purification using AVB Sepharose (e.g. GE Healthcare Life Sciences). 
     In many gene therapy applications, it is desirable that the gene therapy vector be delivered with a high degree of specificity to a particular tissue type. Accordingly, a viral vector can be modified to have specificity for a given cell type by expressing a ligand as a fusion protein with a viral coat protein on the outer surface of the virus. The ligand is chosen to have affinity for a receptor known to be present on the cell type of interest. For example, Han et al.,  Proc. Natl. Acad. Sci. USA  92:9747-9751 (1995), reported that Moloney mouse leukemia virus can be modified to express human heregulin fused to gp70, and the recombinant virus infects certain human breast cancer cells expressing human epidermal growth factor receptor. This principle can be extended to other virus-target cell pairs, in which the target cell expresses a receptor and the virus expresses a fusion protein comprising a ligand for the cell-surface receptor. For example, filamentous phage can be engineered to display antibody fragments (e.g., FAB or Fv) having specific binding affinity for virtually any chosen cellular receptor. Although the above description applies primarily to viral vectors, the same principles can be applied to nonviral vectors. Such vectors can be engineered to contain specific uptake sequences which favor uptake by specific target cells. 
     Gene therapy vectors can be delivered in vivo by administration to an individual patient, typically by systemic administration (e.g., intravenous, intraperitoneal, intramuscular, subdermal, or intracranial infusion, including direct injection into the brain) or topical application, as described below. 
     Pharmaceutically acceptable carriers are determined in part by the particular composition being administered, as well as by the particular method used to administer the composition. Accordingly, there is a wide variety of suitable formulations of pharmaceutical compositions available, as described below (see, e.g.,  Remington&#39;s Pharmaceutical Sciences,  17th ed., 1989). 
     The effective amount of expression cassette (and optional nuclease(s), and/or modified cells) to be administered will vary from patient to patient. Accordingly, effective amounts are best determined by the physician administering the compositions (e.g., cells) and appropriate dosages can be determined readily by one of ordinary skill in the art. Analysis of the serum, plasma or other tissue levels of the therapeutic polypeptide and comparison to the initial level prior to administration can determine whether the amount being administered is too low, within the right range or too high. Suitable regimes for initial and subsequent administrations are also variable, but are typified by an initial administration followed by subsequent administrations if necessary. Subsequent administrations may be administered at variable intervals, ranging from daily to annually to every several years. One of skill in the art will appreciate that appropriate immunosuppressive techniques may be recommended to avoid inhibition or blockage of transduction by immunosuppression of the delivery vectors, see e.g., Vilquin et al., (1995)  Human Gene Ther.,  6:1391-1401. 
     Formulations for both ex vivo and in vivo administrations include suspensions (e.g., of genetically modified cells, liposomes or nanoparticles) in liquid or emulsified liquids. The active ingredients often are mixed with excipients which are pharmaceutically acceptable and compatible with the active ingredient. Suitable excipients include, for example, water, saline, dextrose, glycerol, ethanol or the like, and combinations thereof. In addition, the composition may contain minor amounts of auxiliary substances, such as, wetting or emulsifying agents, pH buffering agents, stabilizing agents or other reagents that enhance the effectiveness of the pharmaceutical composition. 
     Applications 
     The methods and compositions disclosed herein are for providing therapies for any disease by provision of a transgene that expresses a product that is lacking or deficient in the disease or otherwise treats or prevents the disease. 
     EXAMPLES 
     Example 1: Clinical Methods 
     Quantitative PCR 
     qRT-PCR (for human Factor VIII mRNA levels): RNA/DNA is isolated from plasma using AllPrep DNA/RNA kit per the manufacturer&#39;s instructions (Qiagen, Carlsbad Calif.). Extracted RNA is then used to make cDNA using Quantitect cDNA synthesis kit (Qiagen, Carlsbad Calif.). Quantitative PCR is then carried out using SsoAdvanced Universal Probes Supermix (Biorad, Hercules Calif.) on the Biorad CFX 96 using labelled primer/probe assays from IDT (Coralville Iowa). For the specific detection of human Factor VIII mRNA the primer/probe assay is custom; Forward primer (GGAGATGAAGAAGGAGGACTTTG) (SEQ ID NO:6), probe (ACATCTACGACGAGGACGAGAACCA) (SEQ ID NO:7) and Reverse primer (TCCACAGCAGCAATGAAGTAG) (SEQ ID NO:8). Quantitative qRT-PCR (not absolute) is used with normalization to GAPDH for each sample, and final data analyses is reported as relative to one sample which is set to 1.0. No template control and no reverse transcriptase controls are run with all samples and produce no detectable signal. 
     qPCR (for vector genome, VG, analyses): RNA/DNA is isolated from plasma using AllPrep DNA/RNA kit per the manufacturer&#39;s instructions (Qiagen, Carlsbad Calif.). Extracted DNA is used for quantitative PCR with TaqMan Fast Universal PCR Master Mix, No AmpErase UNG (Applied Biosystems, Foster City, Calif.) on the AB 7300 real-time PCR system (Applied Biosystems, Foster City, Calif.). For the specific detection of human Factor VIII the primer/probe assay is custom; forward primer (CCTGGGCCAGTTCCTGCT) (SEQ ID NO:9), probe (TTCTGCCACATCAGCAGCCACCA) (SEQ ID NO:10) and reverse primer (GGCCTCCATGCCATCATG) (SEQ ID NO:11). No-template controls are run with all samples and produce no detectable signal. A qPCR DNA standard curve is generated from seven, serial 4-fold dilutions of a known amount of purified, linearized human Factor VIII plasmid. 
     Human FVIII total antigen immunoassay. Human Factor VIII B-Domain Deleted (hFVIII-BDD) total antigen in citrated human plasma is measured using an hFVIIIBDD immunoassay developed at Sangamo Therapeutics, Inc. Xyntha® (human recombinant BDD-FVIII) reference material will be used as the calibrator. Xyntha® will also be used as the QC to represent hFVIII-BDD antigen. The assay is a sandwich ELISA that uses a monoclonal antibody (mAb) as the capture antibody and a biotinylated mAb as the detection antibody, both of which have the A2 domain of the FVIII as the epitope. Following coating with the capture mAb (GMA-8023; Green Mountain Antibodies), blocking and washing, plasma samples, calibration and quality control samples at a minimal required dilution (MRD) of 5, are incubated in the assay plate, followed by washing. A biotinylated mAb (GMA-8024; Green Mountain Antibodies) is applied to the plate with incubation and subsequent washing before adding streptavidin-horse radish peroxidase (SA-HRP) conjugate reagent. After SA-HRP incubation and washing, the 3,3′,5,5′-Tetramethylbenzidine (TMB) substrate solution is added for 10 minutes before adding an acidic stop solution to quench the reaction prior to detection at 450run. Captured hFVIII-BDD antigen is quantified against a linear standard curve that is regressed using a log-log linear fit across a range of 0.020 IU/mL to 0.500 IU/mL. Calibrators will be prepared using a 10.0 IU/mL Xyntha® Working Solution prepared in pooled congenital FVIII-deficient plasma (George King Bio-Medical, or equivalent). 
     A 9-point calibration curve (range of quantitation from 0.500 IU/mL to 0.020 IU/mL with anchor points at 0.010 IU/mL and 0.000 IU/mL) is prepared using the assay calibrator diluted to the applicable levels in Assay Diluent. Calibration is performed as a single curve in duplicate using a log-log linear fitting with the total hFVIII-BDD antigen content measured in IU/mL on the x-axis, and the optical density (OD, measured at 450 nm) on they axis. The last two standard levels will be anchor points prepared at 0.010 IU/mL and 0.000 IU/mL, not having acceptance criteria. Samples and QCs are assayed in duplicate, and back-calculated against the calibration curve to determine total hFVIII-BDD antigen (concentration reported as IU/mL). 
     Chromogenic human Factor VIII Activity Assay. Activity of secreted human Factor VIII in plasma is determined using the Diapharma Chromogenic Coamatic Factor VIII assay (West Chester, Ohio) according to the manufacturer&#39;s protocol with the exception of the human Factor VIII standard. The human Factor VIII standard used in the ELISA assay is a recombinant purified human Factor VIII (#F0016-06) from US Biologicals (Salem, Mass.). 
     Clotting Activity Assay Activity of secreted human Factor VIII in plasma is determined using the activated partial thromboplastin time (aPTT) assay by Diagnostica Stago (Boston Mass.) according to the manufacturer&#39;s protocol with the exception of the human Factor VIII standard and human Factor VIII-deficient plasma. The human Factor VIII standard is the same as used in the ELISA assay (recombinant purified human Factor VIII, #F0016-06 from US Biologicals, Salem, Mass.). The deficient FVIII reagent used in the clotting assay is FVIII-CD&lt;1% FVIII Activity (frozen deficient FVIII) from Haematologic Technologies, Inc. (Essex Junction, Vt.). 
     Example 2: Preparation of SB-525 
     The final product formulation base buffer, SBR-0099, comprised of phosphate buffered saline (PBS) containing CaCl 2 ), MgCl 2 , 35 mM NaCl (i.e., 0.90 mM CaCl 2 ), 0.49 mM MgCl 2 , 2.68 mM KCl, 1.47 mM KH 2 PO 4 , 172 mM NaCl, 8.10 mM Na 2 HPO 4 ), was prepared using USP grade reagents. The SB-525 Bulk was adjusted to a target concentration of 1.0×10 13  vg/mL in final formulation buffer comprised of PBS containing CaCl 2 ), MgCl 2 , 35 mM NaCl, 1% Sucrose, 0.05% Kolliphor (Poloxamer) P 188. 
     The SB-525 vector is an AAV vector comprising an AAV6 capsid and comprising SEQ ID NO:5 flanked 5′ and 3′ by AAV2 ITRs SEQ ID NOS: 12 and 13, respectively. 
     The SB-525 product was prepared by calculating the product component volume by multiplication of the dose level (vg/kg) by the subject&#39;s weight (kg) and then dividing by the viral genome concentration (vg/mL). The volume of normal saline (NS) was calculated to be at a 1:1 ratio of the SB-525 product. The total volume was calculated by adding together the volume of the NS plus the volume of the SB-525 product. Exemplary doses for the SB-525 product in subjects is shown below in Table I below: 
     
       
         
           
               
             
               
                 TABLE I 
               
             
            
               
                   
               
               
                 Exemplary SB-525 Doses 
               
            
           
           
               
               
               
            
               
                   
                 Dose level 
                 Total SB-525 AAV Dose (vg/kg) 
               
               
                   
                   
               
               
                   
                 1 
                 6.00 × 10 11   
               
               
                   
                 2 
                 9.00 × 10 11   
               
               
                   
                 3 
                 1.20 × 10 12   
               
               
                   
                 4 
                 2.00 × 10 12   
               
               
                   
                 5 
                 4.00 × 10 12   
               
               
                   
                 6 
                 6.00 × 10 12   
               
               
                   
                 7 
                 1.00 × 10 13   
               
               
                   
                   
               
            
           
         
       
     
     Example 3: Infusion Protocol 
     Total volumes were expected to be between 4 mL and 200 mL, depending on subject&#39;s dose level assignment and body weight. If the total volume was less than 50 mL, then the infusion product was administered via syringe, while when the volume was greater than 50 mL, the infusion product was administered via infusion bag. Both infusion rates were at 100 mL/hour using a constant rate infusion pump. 
     Example 4: Study Objectives and Clinical Endpoints 
     Inclusion and exclusion criteria: For the study, the inclusion criteria included a subject being male and ≥18 years of age that had been treated or exposed to FVIII concentrates or cryoprecipitate for at least 150 exposure days. In addition, the subject needed to have ≥12 bleeding episodes over the preceding 12 months. Exclusion criteria included a subject having neutralizing antibodies against the AAV6 capsid, FVIII inhibitor or history of one, hypersensitivity to FVIII, evidence of any bleeding disorder in addition to Hemophilia A, markers of hepatic inflammation, and use of systemic (IV or oral) immunomodulatory agent. 
     Study objectives: The primary object of this study was to evaluate safety. This the primary objectives were to examine the safety and tolerability of SB-525 and evaluate the time-course profile of FVIII activity after dosing with SB-525. Secondary endpoints included observation in a change in baseline use of FVIII replacement therapy (“factor”) and the frequency and severity in bleeding episodes, an evaluation of the clinical impact on the hemophilia A after dosing, and also evaluating the immune response to FVIII and vector shedding of the AAV2/6 vector. Exploratory objectives included evaluating the concurrence between FVIII levels by ELISA and FVIII activity assays and to evaluate any immune response to SB-525. 
     Approximately 20 subjects may be enrolled in this study. The dose selection and number of subjects studied at each dose level will be based on safety and the cumulative pharmacodynamic response (kinetics of circulating FVIII levels) observed in previously dosed subjects. 
     Approximately 7 dose levels may need to be studied to identify a safe and tolerable therapeutic range. Potential dose levels are 6×10 11 , 9×10 11 , 1.2×10 12 , 2×10 12 , 4×10 12 , 6×10 12  and 1×10 13  vg/kg. The starting dose level (9×10 11  vg/kg) is associated with FVIII activity of 12% of normal in a NHP study. 
     Example 5: Preliminary Results 
     Five patients were treated preliminarily. The SB-525 was found to generally well tolerated with no treatment-related serious adverse events and no use of steroid tapering. One patient treated in the third cohort (dose level 3) achieved expression of Factor VIII at a therapeutically relevant level that may be predictive of significant reduction or elimination of spontaneous bleeds and factor usage. In the second cohort (dose level 2), reduced factor usage has been observed following treatment. 
     Example 6: Eight Patients Treated with SB-525 Gene Therapy Showed Dose-Dependent Increases in FVIII Activity, with Two Patients Treated with the 3×10 13  vg/kg Dose Reaching Normal FVIII Levels 
     The Phase 1/2 Alta study is an open-label, dose-ranging clinical trial designed to assess the safety and tolerability of SB-525 in up to 20 adult patients with severe hemophilia A. Data indicate that SB-525 was generally well-tolerated and demonstrated a dose-dependent increase in Factor VIII (FVIII) levels across the four dosage cohorts. 
     The data from the first eight patients with hemophilia A treated with SB-525 gene therapy are encouraging and demonstrate a dose-dependent relationship, evidence of sustained factor levels, and low variability in both within each patient and within each cohort. 
     The Phase 1/2 data include eight patients treated across four ascending dosage cohorts (9×10 11  vg/kg, 2×10 12  vg/kg, 1×10 13  vg/kg and 3×10 13  vg/kg, with two patients per cohort). Patients demonstrated a dose-dependent increase in FVIII levels, achieving clinically relevant increases in FVIII activity in the higher dosage cohorts and normal FVIII levels in the 3×10 13  vg/kg dosage cohort (normal range: 50-150%). A dose-dependent reduction in the use of Factor VIII replacement therapy was also observed, with significant reductions observed in the higher dose cohorts. SB-525 was generally well-tolerated, with one patient (treated with the 3×10 13  vg/kg dose) reporting a treatment-related serious adverse event of hypotension and fever, which occurred following vector infusion and resolved with treatment within 24 hours of completion of vector infusion. 
     Patients in the study were not treated with prophylactic steroids. No treatment-related serious adverse events and no ALT elevations requiring more than seven days of corticosteroid treatment were observed in the first three cohorts. One patient in the fourth cohort experienced an ALT elevation (&gt;1.5×ULN) at week four that required a tapering course of oral steroids. The patient did not have any associated loss of Factor VIII activity or ALT elevations 7 weeks following initiation of the steroid therapy. The same patient experienced a treatment-related infusion reaction but was discharged the subsequent day according to the protocol-specified timeline. 
     Table II provides data illustrating results of administration of dosages of AAV vector of 9×10 11 , 2×10 12 , 1×10 13  and 3×10 13  vg/Kg.  FIGS. 1-3  provide FVIII activity data obtained post-administration. 
     
       
         
           
               
             
               
                 TABLE II 
               
             
            
               
                   
               
               
                 Results of administration of dosages of AAV. “Follow-up” refers to the time 
               
               
                 period after administration at which FVIII activity levels (column 2) and the 
               
               
                 frequency of FVIII treatments (column 5) was measured. 
               
            
           
           
               
               
               
               
               
            
               
                   
                 FVIII activity 
                   
                 Number of FVIII 
                 Number of 
               
               
                 Dose of 
                 levels (one- 
                   
                 treatments 
                 FVIII 
               
               
                 SB-525 
                 stage clotting 
                   
                 before SB-525 
                 treatments after 
               
               
                 (vg/kg) 
                 assay 
                 Follow-up 
                 injection 
                 SB-525 injection 
               
               
                   
               
               
                 9 × 10 11   
                 &lt;1%&lt; 
                 52 weeks 
                 2-3/week 
                 Prophylactic, 
               
               
                   
                   
                   
                   
                 week 12 
               
               
                 9 × 10 11   
                 &lt;1%&lt; 
                 52 weeks 
                 2/week 
                 Prophylactic, 
               
               
                   
                   
                   
                   
                 week 13 
               
               
                 2 × 10 12   
                 &lt;1%&lt; 
                 52 weeks 
                 2-3/month 
                 9 in 12 months 
               
               
                 2 × 10 12   
                  2-3% 
                 48 weeks 
                 3/week 
                 7 in 12 monhts 
               
               
                 1 × 10 13   
                  13-20% 
                 40 weeks 
                 3/week 
                 7 in 36 weeks 
               
               
                 1 × 10 13   
                  5-10% 
                 28 weeks 
                 1/3 weeks 
                 0 in 16 weeks 
               
               
                 3 × 10 13   
                 115-172% 
                 12 weeks 
                 2/week 
                 0 in 12 weeks 
               
               
                 3 × 10 13   
                  23-41% 
                  6 weeks 
                 3-4/week 
                 Prophylactic in 
               
               
                   
                   
                   
                   
                 1st 3 weeks 
               
               
                   
               
            
           
         
       
     
     Example 7: Ten Patients Treated with SB-525 Gene Therapy Showed Dose-Dependent Increases in FVIII Activity, with Four Patients Treated with the 3×10 13  vg/kg Dose Reaching Normal FVIII Levels 
     The eight patients described in Example 6 were followed for more time and a further two patients (patients 9 and 10) were added to the trial at the 3×10 13  vg/kg dose.  FIGS. 4 and 5  illustrate FVIII activity in all ten patients over time post treatment with the vector. 
     As the dose escalates, spontaneous bleeding episodes disappear, and no bleeding episode was reported for any of the high dose patients. See,  FIG. 6 . FVIII usage, after a post-vector injection coverage of around 3 weeks, dropped to zero for one patient of cohort 3 (1×10 13  vg/kg) and all patients of the high dose cohort (3×10 13  vg/kg). Patient 9 had a last infusion at 3 weeks and 2 days, but no infusion since. See,  FIG. 7  (asterisk signifying infusion occurred 2 days more than 3 weeks). 
       FIGS. 8-10  summarizes adverse event findings from the clinical trial. 
     All patents, patent applications and publications mentioned herein are hereby incorporated by reference in their entirety. 
     Although disclosure has been provided in some detail by way of illustration and example for the purposes of clarity of understanding, it will be apparent to those skilled in the art that various changes and modifications can be practiced without departing from the spirit or scope of the disclosure. Accordingly, the foregoing descriptions and examples should not be construed as limiting.