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• W1978582140 abstract "Summary. The hepatitis C virus (HCV) 3′‐untranslated region (UTR) and negative‐strand RNA sequences contribute cis‐acting functions essential to viral RNA replication. Although efficient suppression of HCV replicon RNA in cell culture has been demonstrated with small interfering RNAs (siRNAs) directed against various sequences in the 5′ UTR and coding regions, data regarding siRNA targeting of the 3′ UTR have been lacking. Furthermore, it has not been definitively shown whether the active constructs, identified to date, exert their effect exclusively via suppression of the replicon positive strand, negative strand or some combination of both strands. In the present study, we assayed inhibitory activity of various siRNAs targeting the 3′ UTR by transient transfection in a subgenomic replicon cell culture model. A survey of 13 candidate target sites in the 3′‐UTR X sequence indicated a uniformly low activity of siRNA constructs against the steady‐state level of replicon. In contrast, the majority of these same siRNAs exhibited high activity against HCV X sequences of either polarity when these targets were presented in the context of a mammalian polymerase II mRNA transcript. Transfection of siRNAs directed against other regions of the replicon revealed differences in the magnitude of inhibitory effects against positive‐strand and negative‐strand target sites. Strand preference of siRNA activity was further demonstrated through the introduction of base‐pair‐destabilizing mutations that promote strand‐specific targeting. The results suggest that the HCV positive‐strand 5′ UTR and coding region are efficiently and directly targeted by siRNA, whereas the 3′ UTR and the entire negative strand are relatively resistant to RNA interference." @default.
• W1978582140 created "2016-06-24" @default.
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• W1978582140 date "2006-08-03" @default.
• W1978582140 modified "2023-10-16" @default.
• W1978582140 title "Positional effects and strand preference of RNA interference against hepatitis C virus target sequences" @default.
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• W1978582140 doi "https://doi.org/10.1111/j.1365-2893.2006.00794.x" @default.
• W1978582140 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17305886" @default.
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