Compositions for treating hearing loss and methods of use thereof
This invention also relates to compounds, compositions, and methods useful for modulating the expression and activity of genes encoding proteins involved in deafness caused by dominant negative mechanism of action by RNA interference (RNAi) using small nucleic acid molecules. In particular, the instant invention features small nucleic acid molecules, such as short interfering nucleic acid, short interfering RNA, double-stranded RNA (dsRNA), micro-RNA (mRNA), and short hairpin RNA (shRNA) molecules and methods used to modulate the expression of genes involved in deafness caused by dominant negative mechanism of action.
1. A composition comprising an isolated RNA molecule comprising a first portion, wherein the first portion is no more than 30 nucleotides in length, wherein the first portion comprises a sequence that is complementary to target sequence 5′-AAC GTG TGC TAC GAT CAC TAC-3′ (siRNA1; SEQ ID NO:1).
2. The composition of claim 1 , further comprising a second portion, wherein the second portion has a sequence that is complementary to the first portion.
3. The composition of claim 2 , wherein the first portion is operably linked to the second portion via a linker molecule.
4. The composition of claim 3 , wherein the linker molecule is a polynucleotide linker.
5. The composition of claim 3 , wherein the linker molecule is a non-nucleotide linker.
6. The composition of claim 5 , wherein the linker molecule forms a loop of a hairpin.
7. The composition of claim 6 , wherein the linker molecule is about 4 to about 10 nucleotides in length.
8. The composition of claim 1 , wherein the first portion is from about 19 to about 23 nucleotides in length.
9. The composition of claim 1 , wherein the first portion comprises about 21 nucleotides.
10. The composition of claim 2 , wherein about 19 nucleotides of the first portion is base-paired to the complementary nucleotides of the second portion and wherein at least two 3′ terminal nucleotides of first and second portions are not base-paired to the nucleotides of the other portion.
11. The composition of claim 9 , further comprising a second portion, wherein all of the about 21 nucleotides of the first portion are base-paired to the complementary nucleotides of the second portion.
12. A vector comprising a nucleic acid molecule encoding the composition of claim 1 .
13. A host cell comprising the vector of claim 12 .
14. A pharmaceutical composition comprising the composition of claim 1 or the vector of claim 12 .
15. The pharmaceutical composition of claim 14 , further comprising a liposome.
16. The pharmaceutical composition of claim 14 , further comprising a pharmaceutically acceptable carrier or diluent.