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Oncomirs : microRNAs with a role in cancer

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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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Down-regulation of miR-141 in gastric cancer and its involvement in cell growth

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Relationships of microRNA expression in mouse lung with age and exposure to cigarette smoke and light

TL;DR: Supporting evidence is presented that microRNAs play a fundamental role in both physiological and pathological changes occurring in mouse lung, reflecting both adaptive mechanisms and activation of pathways involved in the pathogenesis of pulmonary diseases.
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MicroRNA-30a Sensitizes Tumor Cells to cis-Platinum via Suppressing Beclin 1-mediated Autophagy

TL;DR: It is demonstrated for the first time that microRNA-30a can sensitize tumor cells to cis-DDP via reducing beclin 1-mediated autophagy and that increasing miR-30A level in tumor cells represents a novel approach to enhance the efficacy of chemotherapy during cancer treatment.
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MicroRNA-138 suppresses epithelial–mesenchymal transition in squamous cell carcinoma cell lines

TL;DR: It is demonstrated that down-regulation of miR-138 is a multi-functional molecular regulator and plays major roles in EMT and in HNSCC progression and its effects on cell migration and invasion through targeting RhoC and ROCK2 are observed.
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.
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The C. elegans heterochronic gene lin-4 encodes small RNAs with antisense complementarity to lin-14

TL;DR: Two small lin-4 transcripts of approximately 22 and 61 nt were identified in C. elegans and found to contain sequences complementary to a repeated sequence element in the 3' untranslated region (UTR) of lin-14 mRNA, suggesting that lin- 4 regulates lin- 14 translation via an antisense RNA-RNA interaction.
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MicroRNA expression profiles classify human cancers

TL;DR: A new, bead-based flow cytometric miRNA expression profiling method is used to present a systematic expression analysis of 217 mammalian miRNAs from 334 samples, including multiple human cancers, and finds the miRNA profiles are surprisingly informative, reflecting the developmental lineage and differentiation state of the tumours.
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Prediction of Mammalian MicroRNA Targets

TL;DR: The predicted regulatory targets of mammalian miRNAs were enriched for genes involved in transcriptional regulation but also encompassed an unexpectedly broad range of other functions.
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The nuclear RNase III Drosha initiates microRNA processing

TL;DR: The two RNase III proteins, Drosha and Dicer, may collaborate in the stepwise processing of miRNAs, and have key roles in miRNA-mediated gene regulation in processes such as development and differentiation.
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