Adeno-associated viral (AAV) vectors useful for transducing adipose tissue
The present invention relates to adeno-associated viral vector useful for transducing adipose tissue. The invention also relates to polynucleotides, plasmids, vectors and methods for the production of such adeno-associated viral vector. The invention also relates to gene therapy methods useful for the treatment of a disease that requires the regulation of the expression levels of a gene.
1. An adeno-associated viral (AAV) vector selected from the group consisting of AAV6, AAV7, AAV8 and AAV9, comprising a recombinant viral genome wherein said recombinant viral genome comprises AAV Inverted Terminal Repeats (ITRs) and an expression cassette comprising an adipose tissue-specific transcriptional regulatory region operatively linked to a polynucleotide of interest, said vector further comprising a capsid of AAV serotype 6, AAV serotype 7, AAV serotype 8 or AAV serotype 9, wherein said polynucleotide is specifically expressed in adipocytes of a mammal after administration of the vector to the mammal.
2. The adeno-associated viral vector according to claim 1 wherein the adipose tissue-specific transcriptional regulatory region comprises a promoter region selected from the group consisting of the basal aP2 promoter and the basal UCP1 promoter.
3. The adeno-associated viral vector according to claim 2 wherein the adipose tissue-specific transcriptional regulatory region further comprises an enhancer region operatively linked to the promoter region.
4. The adeno-associated viral vector according to claim 3 wherein the enhancer region is selected from the group consisting of the adipose-specific aP2 enhancer and the adipose-specific UCP1 enhancer.
5. The adeno-associated viral vector according to claim 4 wherein the transcriptional regulatory region is selected from the group consisting of:
(i) a polynucleotide comprising the adipose-specific aP2 enhancer and the basal murine aP2 promoter and
(ii) a polynucleotide comprising the adipose-specific UCP1 enhancer and the basal rat UCP1 promoter.
6. The adeno-associated viral vector according to claim 1 wherein the expression cassette further comprises a post-transcriptional regulatory region.
7. The adeno-associated viral vector according to claim 6 wherein the post-transcriptional regulatory region is the Woodchuck Hepatitis Virus Posttranscriptional Regulatory Element (WPRE).
8. The adeno-associated viral vector according to claim 1 wherein the polynucleotide of interest encodes a protein which is selected from the group consisting of a secreted protein which acts systemically and a protein which acts upon said adipocyte.
9. The adeno-associated viral vector according to claim 1 wherein the polynucleotide of interest encodes a protein selected from the group consisting of hexokinase, glucokinase, alkaline phosphatase, and vascular endothelial growth factor.
10. The adeno-associated viral vector according to claim 1 wherein the adeno-associated virus ITRs are AAV2 ITRs.
11. The adeno-associated viral vector according to claim 1 which further comprises at least one miRNA target sequence.
12. The adeno-associated viral vector according to claim 11 wherein the at least one miRNA target sequence is miRT122a.
13. The adeno-associated viral vector according to claim 11 wherein the at least one miRNA target sequence is miRT1.
14. The adeno-associated viral vector according to claim 11 which comprises at least one copy of miRT1 and one copy of miRT122a.
15. A pharmaceutical composition comprising an adeno-associated viral vector according to claim 1 .
16. The AAV vector according to claim 1 , wherein the AAV vector comprises a capsid of AAV serotype 8 or AAV serotype 9.
17. The AAV vector according to claim 15 , wherein the AAV vector comprises a capsid of AAV serotype 9.
18. The AAV vector according to claim 1 , wherein the polynucleotide of interest is minimally expressed or is not expressed in the liver of a mammal after administration of the vector to the mammal.
19. The AAV vector according to claim 15 , wherein the adipose tissue-specific transcriptional regulatory region comprises a promoter region selected from the group consisting of the basal aP2 promoter and the basal UCP1 promoter.