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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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Argonaute-2 Expression Is Regulated by Epidermal Growth Factor Receptor and Mitogen-Activated Protein Kinase Signaling and Correlates with a Transformed Phenotype in Breast Cancer Cells

TL;DR: In this article, it was shown that the expression of Ago2, but not Ago1, Ago3, or Ago4, is elevated in estrogen receptor (ER) alpha-negative (ERalpha(-)) vs. ERalpha-positive (ERα+) breast cancer cell lines, and in ERalpha(-) breast tumors.
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MicroRNA-21 is a potential link between non-alcoholic fatty liver disease and hepatocellular carcinoma via modulation of the HBP1-p53-Srebp1c pathway

TL;DR: A novel mechanism by which microRNA-21, in part, promotes hepatic lipid accumulation and cancer progression by interacting with the Hbp1-p53-Srebp1c pathway is revealed and the potential therapeutic value of micro RNA-21-ASO is suggested.
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Rapid microRNA Profiling on Encoded Gel Microparticles

TL;DR: The ideal system for miRNA quantification would offer the detection performance of array and PCR-based methods, the throughput of bead-based systems, and improved reproducibility with a user-friendly workflow.
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Expression of microRNAs in patients with pancreatic cancer and its prognostic significance.

TL;DR: The tumorigenic role ofmiR-21 and miR-155 was confirmed, whereas down-regulation of mi R-31, miR -145, andMiR-146a, in dispute with current literature, renders necessary the revision of use of microRNAs as biological markers.
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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