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- W2030378519 abstract "The thermodynamic asymmetry of siRNA duplexes determines their silencing activity. Favorable asymmetry can be achieved by incorporation of mismatches into the 3' part of the sense strand, providing fork-siRNAs, which exhibit higher silencing activity and higher sensitivity to nucleases. Recently, we found that selective 2'-O-methyl modifications of the nuclease-sensitive sites of siRNA significantly improve its nuclease resistance without substantial loss of silencing activity. Here, we examined the impact of nucleotide mismatches and the number and location of 2'-O-methyl modifications on the silencing activity and nuclease resistance of anti-MDR1 siRNAs. We found that both nonmodified and selectively modified fork-siRNAs with 4 mismatches at the 3' end of the sense strand suppress the expression of target gene at lower effective concentrations than the parent siRNAs with classical duplex design. The selective modification of nuclease-sensitive sites significantly improved the stability of fork-siRNAs in the presence of serum. The selectively modified fork-siRNA duplexes provided inhibitory effect over a period of 12 days posttransfection, whereas the gene silencing activity of the nonmodified analogs expired within 6 days. Thus, selective chemical modifications and structural alteration of siRNA duplexes improve their silencing properties and significantly prolong the duration of their silencing effect." @default.
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- W2030378519 date "2010-12-01" @default.
- W2030378519 modified "2023-09-25" @default.
- W2030378519 title "2'-<i>O</i>-Methyl–Modified Anti-<i>MDR1</i> Fork-siRNA Duplexes Exhibiting High Nuclease Resistance and Prolonged Silencing Activity" @default.
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- W2030378519 doi "https://doi.org/10.1089/oli.2010.0246" @default.
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