小RNA
细胞生物学
化学
生物
计算生物学
遗传学
基因
作者
Ramesh S. Pillai,S. N. Bhattacharyya,Caroline G. Artus,Tabea Zoller,Nicolas Cougot,Eugénia Basyuk,Édouard Bertrand,Witold Filipowicz
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2005-09-02
卷期号:309 (5740): 1573-1576
被引量:1335
标识
DOI:10.1126/science.1115079
摘要
MicroRNAs (miRNAs) are ∼21-nucleotide-long RNA molecules regulating gene expression in multicellular eukaryotes. In metazoa, miRNAs act by imperfectly base-pairing with the 3′ untranslated region of target messenger RNAs (mRNAs) and repressing protein accumulation by an unknown mechanism. We demonstrate that endogenous let-7 microribonucleoproteins (miRNPs) or the tethering of Argonaute (Ago) proteins to reporter mRNAs in human cells inhibit translation initiation. M 7 G-cap-independent translation is not subject to repression, suggesting that miRNPs interfere with recognition of the cap. Repressed mRNAs, Ago proteins, and miRNAs were all found to accumulate in processing bodies. We propose that localization of mRNAs to these structures is a consequence of translational repression.
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