Journal ArticleDOI
Inhibition of translational initiation by Let-7 MicroRNA in human cells.
Ramesh S. Pillai,Suvendra N. Bhattacharyya,Caroline G. Artus,Tabea Zoller,Nicolas Cougot,Eugenia Basyuk,Edouard Bertrand,Witold Filipowicz +7 more
TLDR
It is demonstrated that endogenous let-7 microribonucleoproteins (miRNPs) or the tethering of Argonaute proteins to reporter mRNAs in human cells inhibit translation initiation, suggesting that miRNPs interfere with recognition of the cap.Abstract:
MicroRNAs (miRNAs) are approximately 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.read more
Citations
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疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
TL;DR: PfPMP1）与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作�ly.
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Oncomirs : microRNAs with a role in cancer
TL;DR: I MicroRNAs (miRNAs) are an abundant class of small non-protein-coding RNAs that function as negative gene regulators as discussed by the authors, and have been shown to repress the expression of important cancer-related genes and might prove useful in the diagnosis and treatment of cancer.
Journal ArticleDOI
Oncomirs — microRNAs with a role in cancer
TL;DR: Evidence has shown that miRNA mutations or mis-expression correlate with various human cancers and indicates that miRNAs can function as tumour suppressors and oncogenes.
Journal ArticleDOI
Mechanisms of post-transcriptional regulation by microRNAs: are the answers in sight?
TL;DR: This Review summarizes the current understanding of the mechanistic aspects of microRNA-induced repression of translation and discusses some of the controversies regarding different modes of micro RNA function.
Journal ArticleDOI
Origins and Mechanisms of miRNAs and siRNAs
TL;DR: This work has revealed unexpected diversity in their biogenesis pathways and the regulatory mechanisms that they access, which has direct implications for fundamental biology as well as disease etiology and treatment.
References
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Journal ArticleDOI
MicroRNAs: Genomics, Biogenesis, Mechanism, and Function
TL;DR: Although they escaped notice until relatively recently, miRNAs comprise one of the more abundant classes of gene regulatory molecules in multicellular organisms and likely influence the output of many protein-coding genes.
疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
TL;DR: PfPMP1）与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作�ly.
Journal ArticleDOI
Microarray analysis shows that some microRNAs downregulate large numbers of target mRNAs
Lee P. Lim,Nelson C. Lau,Philip W. Garrett-engele,Andrew Grimson,Janell M. Schelter,John C. Castle,David P. Bartel,Peter S. Linsley,Jason M. Johnson +8 more
TL;DR: These results suggest that metazoan miRNAs can reduce the levels of many of their target transcripts, not just the amount of protein deriving from these transcripts, and seem to downregulate a far greater number of targets than previously appreciated.
Journal ArticleDOI
RAS Is Regulated by the let-7 MicroRNA Family
Steven M. Johnson,Helge Grosshans,Jaclyn Shingara,Mike Byrom,Rich Jarvis,Angie Cheng,Emmanuel Labourier,Kristy L. Reinert,David Brown,Frank J. Slack +9 more
TL;DR: It is shown that the let-7 family negatively regulates let-60/RAS, a regulatory RNAs found in multicellular eukaryotes, including humans, where they are implicated in cancer.
Journal ArticleDOI
bantam Encodes a Developmentally Regulated microRNA that Controls Cell Proliferation and Regulates the Proapoptotic Gene hid in Drosophila
TL;DR: It is reported that the bantam gene of Drosophila encodes a 21 nucleotide microRNA that promotes tissue growth and identifies the pro-apoptotic gene hid as a target for regulation by bantam miRNA, providing an explanation for bantam's anti-APoptotic activity.