Ribosome profiling shows that miR-430 reduces translation before causing mRNA decay in zebrafish.
Ribosome profiling shows that miR-430 reduces translation before causing mRNA decay in zebrafish.
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DOI:
10.1126/science.1215704
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发表时间:
2012-04-13
期刊:
影响因子:
--
通讯作者:
Giraldez AJ
中科院分区:
文献类型:
--
作者:
Bazzini AA;Lee MT;Giraldez AJ
MicroRNAs regulate gene expression through deadenylation, repression and mRNA decay. However, the contribution of each mechanism in non-steady-state situations remains unclear. We monitored the impact of miR-430 on ribosome occupancy of endogenous mRNAs in wild type and dicer mutants lacking mature miR-430. We find that miR-430 reduces the number of ribosomes on target mRNAs before causing mRNA decay. Translational repression occurs before complete deadenylation, and disrupting deadenylation using an internal poly(A) tail did not block target repression. Finally, we observe that ribosome density along the length of the message remains constant, suggesting that translational repression occurs by reducing the rate of initiation rather than affecting elongation or causing ribosomal drop-off. In summary, our results show that miR-430 regulates translation initiation before inducing mRNA decay.
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