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Oncomirs : microRNAs with a role in cancer

TLDR
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.
Abstract
I MicroRNAs (miRNAs) are an abundant class of small non-protein-coding RNAs that function as negative gene regulators. They regulate diverse biological processes, and bioinformatic data indicates that each miRNA can control hundreds of gene targets, underscoring the potential influence of miRNAs on almost every genetic pathway. Recent 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. miRNAs have been shown to repress the expression of important cancer-related genes and might prove useful in the diagnosis and treatment of cancer.

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Journal Article

MicroRNA signatures in human cancers

TL;DR: The causes of the widespread differential expression of miRNA genes in malignant compared with normal cells can be explained by the location of these genes in cancer-associated genomic regions, by epigenetic mechanisms and by alterations in the miRNA processing machinery as discussed by the authors.
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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.
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Non-coding RNAs in human disease

TL;DR: Dysregulation of these ncRNAs is being found to have relevance not only to tumorigenesis, but also to neurological, cardiovascular, developmental and other diseases, and there is great interest in therapeutic strategies to counteract these perturbations.
References
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An Extensive Class of Small RNAs in Caenorhabditis elegans

TL;DR: Using bioinformatics and cDNA cloning, this work found 15 new miRNA genes in C. elegans that express small transcripts that vary in abundance during larval development, and three of them have apparent homologs in mammals and/or insects.
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Exportin-5 mediates the nuclear export of pre-microRNAs and short hairpin RNAs

TL;DR: It is demonstrated that human pre-miRNA nuclear export, and miRNA function, are dependent on Exportin-5, an additional cellular cofactor required for miRNA biogenesis and function.
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Asymmetry in the assembly of the RNAi enzyme complex.

TL;DR: It is shown that the two strands of an siRNA duplex are not equally eligible for assembly into RISC, and it is suggested that single-stranded miRNAs are initially generated as siRNA-like duplexes whose structures predestine one strand to enter the RISC and the other strand to be destroyed.
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MicroRNA targets in Drosophila

TL;DR: The results reaffirm the thesis that miRNAs have an important role in establishing the complex spatial and temporal patterns of gene activity necessary for the orderly progression of development and suggest additional roles in the function of the mature organism.
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A cellular function for the RNA-interference enzyme Dicer in the maturation of the let-7 small temporal RNA.

TL;DR: In Drosophila melanogaster a developmentally regulated precursor RNA is cleaved by an RNA interference-like mechanism to produce mature let-7 stRNA, which regulates developmental timing in Caenorhabditis elegans and probably in other bilateral animals.
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