Isolated dsRNA molecules and methods of using same for silencing target molecules of interest
First Claim
1. An isolated double-stranded RNA (dsRNA) molecule comprising(a) a first RNA strand havingat least one antisense RNA sequence for suppressing expression of a target gene of interest in a corn, rice, tomato, or sorghum plant or an essential target gene of a phytopathogen of a corn, rice, tomato, or sorghum plant,a first heterologous smRNA-binding sequence for binding to a first small RNA (smRNA) expressed in said corn, rice, tomato, sorghum plant, wherein said first smRNA comprises 15-30 nucleotides, and wherein said first smRNA comprises a nucleic acid sequence having at least 95% identity or complementarity to a nucleic acid sequence selected from the group consisting of SEQ ID NOs:
- 41-43, 45, and 47-96,a helicase-binding sequence comprising the helicase binding site of SEQ ID NO;
14; and
(b) a second RNA strand that is a reverse complement of said first RNA strand.
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Abstract
An isolated dsRNA molecule comprising an antisense RNA sequence for regulating a target gene of interest in a plant or a phytopathogen of the plant, wherein the dsRNA sequence is flanked by two complementary sites to an smRNA or smRNAs expressed in the plant and wherein the dsRNA molecule further comprises a helicase binding site positioned so as to allow unwinding of the strands of the isolated dsRNA molecule to single stranded RNA (ssRNA) and recruitment of an RNA-dependent RNA polymerase so as to amplify the dsRNA molecule in the plant cell and generate secondary siRNA products of the dsRNA sequence.
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Citations
28 Claims
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1. An isolated double-stranded RNA (dsRNA) molecule comprising
(a) a first RNA strand having at least one antisense RNA sequence for suppressing expression of a target gene of interest in a corn, rice, tomato, or sorghum plant or an essential target gene of a phytopathogen of a corn, rice, tomato, or sorghum plant, a first heterologous smRNA-binding sequence for binding to a first small RNA (smRNA) expressed in said corn, rice, tomato, sorghum plant, wherein said first smRNA comprises 15-30 nucleotides, and wherein said first smRNA comprises a nucleic acid sequence having at least 95% identity or complementarity to a nucleic acid sequence selected from the group consisting of SEQ ID NOs: - 41-43, 45, and 47-96,
a helicase-binding sequence comprising the helicase binding site of SEQ ID NO;
14; and(b) a second RNA strand that is a reverse complement of said first RNA strand. - 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)
- 41-43, 45, and 47-96,
Specification