Adeno-associated virus compositions for PAH gene transfer and methods of use thereof
Provided herein are adeno-associated virus (AAV) compositions that can express a phenylalanine hydroxylase (PAH) polypeptide in a cell, thereby restoring the PAH gene function. Also provided are methods of use of the AAV compositions, and packaging systems for making the AAV compositions.
1. A packaging system for preparation of a replication-defective AAV comprising:
(a) a first nucleotide sequence comprising a first transcriptional regulatory element operably linked to a nucleotide sequence encoding one or more AAV Rep proteins;
(b) a second nucleotide sequence comprising a second transcriptional regulatory element operably linked to a nucleotide sequence encoding an AAV capsid protein; and
(c) a third nucleotide sequence comprising a transfer genome comprising, from 5′ to 3′:
(i) an AAV2 5′ inverted terminal repeat (ITR) nucleotide sequence;
(ii) a transcriptional regulatory element comprising, from 5′ to 3′, a human hepatic control region 1 (HCR1) and a human al-antitrypsin (hAAT) promoter;
(iii) a silently altered PAH coding sequence having at least 80% sequence identity to the nucleotide sequence of SEQ ID NO: 71, wherein the silently altered PAH coding sequence encodes the amino acid sequence set forth in SEQ ID NO: 23; and
(iv) an AAV2 3′ ITR nucleotide sequence.
2. A method for producing a replication-defective AAV, the method comprising introducing the packaging system of claim 1 into a cell under conditions operative for producing the AAV.
3. The packaging system of claim 1 , wherein the packaging system comprises a first vector comprising the first nucleotide sequence and the second nucleotide sequence, and a second vector comprising the third nucleotide sequence.
4. The packaging system of claim 3 , further comprising a third vector, wherein the third vector is a helper virus vector.
5. The packaging system of claim 4 , wherein the helper virus vector is an independent third vector.
6. The packaging system of claim 4 , wherein the third vector comprises genes encoding helper virus proteins.
7. The packaging system of claim 4 , wherein the helper virus is selected from the group consisting of adenovirus, herpes virus, vaccinia virus, and cytomegalovirus (CMV).
8. The packaging system of claim 7 , wherein the helper virus is adenovirus.
9. The packaging system of claim 8 , wherein the adenovirus genome comprises one or more adenovirus RNA genes selected from the group consisting of E1, E2, E4 and VA.
10. The packaging system of claim 7 , wherein the helper virus is herpes simplex virus (HSV).
11. The packaging system of claim 10 , wherein the HSV genome comprises one or more HSV genes selected from the group consisting of UL5/8/52, ICPO, 1CP4, ICP22 and UL30/UL42.
12. The packaging system of claim 4 , wherein the first vector and the third vector are contained within a first transfecting plasmid.
13. The packaging system of claim 4 , wherein the nucleotide sequences of the second vector and the third vector are contained within a second transfecting plasmid.
14. The packaging system of claim 4 , wherein the nucleotide sequences of the first vector and the third vector are cloned into a recombinant helper virus.
15. The packaging system of claim 4 , wherein the nucleotide sequences of the second vector and the third vector are cloned into a recombinant helper virus.
16. The packaging system of claim 1 , wherein the Rep nucleotide sequence encodes an AAV2 Rep protein.
17. The packaging system of claim 16 , wherein the AAV2 Rep protein is Rep 78/68 or Rep 68/52.
18. The packaging system of claim 16 , wherein the AAV2 Rep protein comprises an amino acid sequence having at least 70% sequence identity to the amino acid sequence of SEQ ID NO: 22.