Minigene therapy
Aspects of the disclosure relate to compositions and methods useful for treating ocular ciliopathies, for example Leber congenital amaurosis (LCA). In some embodiments, the disclosure provides isolated nucleic acids comprising a transgene encoding a CEP290 protein fragment, and methods of treating ocular ciliopathies using the same.
1. An isolated nucleic acid comprising:
(i) a first region comprising a first adeno-associated virus (AAV) inverted terminal repeat (ITR), or a variant thereof; and,
(ii) a second region comprising a transgene encoding a CEP290 protein fragment, wherein the CEP290 protein fragment comprises at least 500 contiguous amino acids of SEQ ID NO: 1, wherein the CEP290 fragment comprises no more than 700 contiguous amino acids of SEQ ID NO: 1, wherein the CEP290 fragment comprises or consists of the sequence set forth in SEQ ID NO: 3, and wherein the CEP290 fragment does not comprise amino acids 1695 to 1966 of SEQ ID NO: 1.
2. The isolated nucleic acid of claim 1 , wherein said CEP290 fragment is encoded by a nucleic acid comprising or consisting of the sequence of SEQ ID NO: 6.
3. The isolated nucleic acid of claim 1 , wherein the transgene further comprises a promoter.
4. The isolated nucleic acid of claim 3 , wherein the promoter is a chicken beta-actin (CBA) promoter, or a tissue specific promoter selected from the group consisting of: an eye-specific promoter, a retinoschisin promoter, K12 promoter, a rhodopsin promoter, a rod-specific promoter, a cone-specific promoter, a rhodopsin kinase promoter, and an interphotoreceptor retinoid-binding protein proximal (IRBP) promoter.
5. The isolated nucleic acid of claim 1 , further comprising a third region comprising a second adeno-associated virus (AAV) inverted terminal repeat (ITR), or a variant thereof.
6. The isolated nucleic acid of claim 1 , wherein the first region is an AAV2 ITR or a variant thereof.
7. A vector comprising the isolated nucleic acid of claim 1 .
8. A host cell comprising the isolated nucleic acid of claim 1 .
9. A recombinant adeno-associated virus (rAAV) comprising:
(i) a capsid protein; and,
(ii) the isolated nucleic acid of claim 1 .
10. The rAAV of claim 9 , wherein the capsid protein is AAV8 capsid protein or AAV5 capsid protein.
11. The rAAV of claim 9 , wherein the capsid protein comprises the sequence set forth in SEQ ID NO: 9.
12. The rAAV of claim 9 , wherein the rAAV is a self-complementary AAV (scAAV).
13. The rAAV of claim 9 , wherein the rAAV is formulated for delivery to an eye of a subject.
14. A method for treating an ocular ciliopathy in a subject in need thereof, the method comprising administering to a subject having an ocular ciliopathy a therapeutically effective amount of the isolated nucleic acid of claim 1 , wherein said administering is via subretinal injection or intravitreal injection.
15. The isolated nucleic acid of claim 1 further comprising a third region, wherein the third region is an AAV2 ITR or a variant thereof.
16. The vector of claim 7 , wherein the vector is a plasmid.