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• W1997822424 startingPage "e75802" @default.
• W1997822424 abstract "Due to their broad cell- and tissue-tropism, alphavirus-based replication-competent vectors are of particular interest for anti-cancer therapy. These properties may, however, be potentially hazardous unless the virus infection is controlled. While the RNA genome of alphaviruses precludes the standard control techniques, host miRNAs can be used to down-regulate viral replication. In this study, target sites from ubiquitous miRNAs and those of miRNAs under-represented in cervical cancer cells were inserted into replication-competent DNA/RNA layered vectors of Semliki Forest virus. It was found that in order to achieve the most efficient suppression of recombinant virus rescue, the introduced target sequences must be fully complementary to those of the corresponding miRNAs. Target sites of ubiquitous miRNAs, introduced into the 3' untranslated region of the viral vector, profoundly reduced the rescue of recombinant viruses. Insertion of the same miRNA targets into coding region of the viral vector was approximately 300-fold less effective. Viruses carrying these miRNAs were genetically unstable and rapidly lost the target sequences. This process was delayed, but not completely prevented, by miRNA inhibitors. Target sites of miRNA under-represented in cervical cancer cells had much smaller but still significant effects on recombinant virus rescue in cervical cancer-derived HeLa cells. Over-expression of miR-214, one of these miRNAs, reduced replication of the targeted virus. Though the majority of rescued viruses maintained the introduced miRNA target sequences, genomes with deletions of these sequences were also detected. Thus, the low-level repression of rescue and replication of targeted virus in HeLa cells was still sufficient to cause genetic instability." @default.
• W1997822424 created "2016-06-24" @default.
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• W1997822424 date "2013-09-30" @default.
• W1997822424 modified "2023-10-16" @default.
• W1997822424 title "Control of the Rescue and Replication of Semliki Forest Virus Recombinants by the Insertion of miRNA Target Sequences" @default.
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• W1997822424 doi "https://doi.org/10.1371/journal.pone.0075802" @default.
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