Capsid-mutated rAAV vectors and methods of use
Disclosed are capsid-mutated rAAV vectors and methods for their use in gene therapy, and particularly for use in delivering therapeutic transgenes to treat a variety of mammalian diseases and disorders, including dysfunctions and abnormal conditions of the human eye. VP3 capsid proteins comprising a modification of one or more of the surface-exposed tyrosine residues are disclosed, and in particular, VP3 capsid protein comprising tyrosine-to-phenylalanine mutations at positions corresponding to Y444F, Y500F, and Y730F of the wild-type AAV2 sequence. Also provided are rAAV virions and viral particles that comprise such a mutated AAV capsid protein and a nucleic acid molecule that expresses one or more selected therapeutic or reporter transgenes in one or more mammalian cells of interest. Advantageously, the capsid-mutated rAAV vectors and virions disclosed herein afford improved transduction efficiency in a variety of cells, tissues and organs of interest, when compared to their unmodified (i.e., wild-type) rAAV vector counterparts.
1. A recombinant adeno-associated virus (rAAV) particle, comprising:
(a) a mutated AAV2 VP3 capsid protein comprising phenylalanines at each of the positions corresponding to Y444, Y500 and Y730 in a wild type AAV2 VP3 capsid protein; and
(b) a rAAV nucleic acid vector comprising a 5′ inverted terminal repeat (ITR), a transgene, and a 3′ ITR.
2. The rAAV particle of claim 1 , wherein the transgene is operatively linked to a sequence that regulates expression of the transgene in a cell.
3. The rAAV particle of claim 2 , wherein the sequence that regulates expression of the transgene in a cell is a promoter.
4. The rAAV particle of claim 1 , wherein the transgene is about 2- to 5-kb in length.
5. The rAAV particle of claim 1 , wherein the nucleic acid vector is a self-complementary (sc) vector.
6. The rAAV particle of claim 1 , wherein the transgene is a reporter transgene.
7. A composition comprising:
(a) a recombinant adeno-associated virus (rAAV) particle that comprises:
(i) a mutated AAV2 VP3 capsid protein comprising phenylalanines at each of the positions corresponding to Y444, Y500 and Y730 in a wild type AAV2 VP3 capsid protein; and
(ii) a rAAV nucleic acid vector comprising a 5′ inverted terminal repeat (ITR), a transgene, and a 3′ ITR; and
(b) a carrier or an excipient.
8. The composition of claim 7 , formulated for injection or topical application to a mammalian eye.
9. The rAAV particle of claim 1 further comprising a phenylalanine at the position corresponding to Y272 in a wild type AAV2 VP3 capsid.
10. A recombinant adeno-associated virus (rAAV) particle, comprising:
(a) a mutated AAV2 VP3 capsid protein consisting of phenylalanines at each of the positions corresponding to Y444, Y500 and Y730 in a wild type AAV2 VP3 capsid protein; and
(b) a rAAV nucleic acid vector comprising a 5′ inverted terminal repeat (ITR), a transgene, and a 3′ ITR.