RNA interference mediating small RNA molecules
First Claim
1. An isolated, synthetic double-stranded RNA molecule, wherein:
- (i) each RNA strand of said double-stranded RNA molecule independently consists of 19-23 nucleotides in length;
(ii) at least one RNA strand forms a single-stranded 3′
-overhang from 1 to 3 nucleotides;
(iii) the 3′
-overhang of said double-stranded RNA molecule comprises at least one nucleotide analogue,wherein said RNA molecule is capable of target-specific RNA interference.
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Abstract
Double-stranded RNA (dsRNA) induces sequence-specific post-transcriptional gene silencing in many organisms by a process known as RNA interference (RNAi). Using a Drosophila in vitro system, we demonstrate that 19-23 nt short RNA fragments are the sequence-specific mediators of RNAi. The short interfering RNAs (siRNAs) are generated by an RNase III-like processing reaction from long dsRNA. Chemically synthesized siRNA duplexes with overhanging 3′ ends mediate efficient target RNA cleavage in the lysate, and the cleavage site is located near the center of the region spanned by the guiding siRNA. Furthermore, we provide evidence that the direction of dsRNA processing determines whether sense or antisense target RNA can be cleaved by the produced siRNP complex.
185 Citations
79 Claims
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1. An isolated, synthetic double-stranded RNA molecule, wherein:
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(i) each RNA strand of said double-stranded RNA molecule independently consists of 19-23 nucleotides in length; (ii) at least one RNA strand forms a single-stranded 3′
-overhang from 1 to 3 nucleotides;(iii) the 3′
-overhang of said double-stranded RNA molecule comprises at least one nucleotide analogue,wherein said RNA molecule is capable of target-specific RNA interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. An isolated, synthetic double-stranded RNA molecule, wherein:
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(i) each RNA strand of said double-stranded RNA molecule independently consists of 19-25 nucleotides in length; (ii) at least one RNA strand forms a single-stranded 3′
-overhang from 1 to 5 nucleotides;(iii) the 3′
-overhang of said double-stranded RNA molecule comprises at least one nucleotide analogue,wherein said RNA molecule is capable of target-specific RNA interference. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. An isolated, synthetic double-stranded RNA molecule, wherein:
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(i) each RNA strand of said double-stranded RNA molecule independently consists of 19-23 nucleotides in length; (ii) at least one RNA strand forms a single-stranded 3′
-overhang from 1 to 3 nucleotides;(iii) the 3′
-overhang of said double-stranded RNA molecule has been stabilized against degradation,wherein said RNA molecule is capable of target-specific RNA interference. - View Dependent Claims (61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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72. An isolated, synthetic double-stranded RNA molecule, wherein:
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(i) each strand independently consists of 21-23 nucleotides; (ii) each strand forms a single-stranded two-nucleotide 3′
-overhang;(iii) the only single-stranded regions in said RNA molecule are the single stranded two-nucleotide 3′
-overhangs; and(iv) each of the two-nucleotide 3′
-overhangs comprises at least one nucleotide analogue to stabilize the 3′
-overhang against degradation,wherein said RNA molecule is capable of target-specific RNA interference. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79)
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Specification