miRNA-mediated gene silencing by translational repression followed by mRNA deadenylation and decay.

miRNA-mediated gene silencing by translational repression followed by mRNA deadenylation and decay.
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DOI:
10.1126/science.1215691
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发表时间:
2012-04-13
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Green R
Green R
中科院分区:
其他
文献类型:
--
作者:
Djuranovic S;Nahvi A;Green R

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miRNAs regulate gene expression through translational repression and/or mRNA deadenylation/decay. As translation, deadenylation and decay are closely linked processes, it is important to establish their ordering and thus to define the molecular mechanism of silencing. We have investigated the kinetics of these events in miRNA-mediated gene silencing using a Drosophila S2 cell-based controllable expression system and show that mRNAs with both natural and engineered 3′UTRs with miRNA target sites are first subject to translational inhibition, followed by effects on deadenylation and decay. We next use a natural translational elongation stall to show that miRNA-mediated silencing inhibits translation at an early step, potentially translation initiation.
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