RNAI induced huntingtin gene suppression
The present invention provides for a double stranded RNA comprising a first RNA sequence and a second RNA sequence wherein the first and second RNA sequence are substantially complementary, wherein the first RNA sequence has a sequence length of at least 19 nucleotides and is substantially complementary to SEQ ID NO. 1. Said double stranded RNA is for use in inducing RNAi against Huntingtin exon 1 sequences. The double stranded RNA of to the invention was capable of reducing neuronal cell death and huntingtin aggregates in an animal model.
1. A double stranded RNA comprising a first RNA sequence and a second RNA sequence wherein the first and second RNA sequence are substantially complementary, wherein the first RNA sequence has a sequence length of at least 19 nucleotides and is fully complementarity to SEQ ID NO. 1.
2. A double stranded RNA according to claim 1 , wherein said double stranded RNA is capable of reducing huntingtin gene expression.
3. A double stranded RNA according to claim 1 , wherein the double stranded RNA is comprised in a pre-miRNA scaffold, a pri-miRNA scaffold, a shRNA, or an siRNA, preferably a pre-miRNA scaffold.
4. A double stranded RNA according to claim 1 , wherein the first RNA sequence has a sequence length of at least 20 nucleotides, preferably of at least 21 nucleotides.
5. A double stranded RNA according to claim 1 , wherein the first strand is selected from the group consisting of SEQ ID NO.3, SEQ ID NO.4, SEQ ID NO.5, SEQ ID NO.6, and SEQ ID NO.7.
6. A double stranded RNA according to claim 1 , wherein the first strand and second strand are selected from the group consisting of the combinations of SEQ ID NO. 3 and 8; SEQ ID NO. 4 and 9; SEQ ID NO. 5 and 10; SEQ ID NO. 5 and 13; SEQ ID NO. 5 and 14; SEQ ID NO. 6 and 11; and SEQ ID NO. and 7 and 12.
7. A double stranded RNA according to claim 1 , wherein the double stranded RNA is comprised in a pre-miRNA scaffold derived from miR-451a or miR-155.
8. A DNA sequence encoding the double stranded RNA according to claim 1 .
9. An expression cassette encoding the double stranded RNA according to claim 1 .
10. An expression cassette according to claim 9 , wherein the expression cassette comprises the PGK promoter, a CMV promoter, a neurospecific promoter or a CBA promoter.
11. A gene therapy vector comprising the expression cassette according to claim 9 .
12. A gene therapy vector according to claim 11 , wherein the gene therapy vector is an AAV vector, preferably an AAV vector of serotype 5.
13. A host cell comprising the DNA sequence according to claim 8 or the expression cassette according to claim 9 .
14. A method of treating Huntington's disease comprising, administering to an individual with Huntington's disease the double stranded RNA according to claim 1 .
15. A method of treating Huntington's disease comprising, administering to an individual with Huntington's disease the expression cassette according to claim 9 .