Virus-encoded microRNAs: novel regulators of gene expression

Trends in Microbiology
Venugopal Nair, Mihaela Zavolan

Abstract

MicroRNAs (miRNAs) are a class of small RNAs that have recently been recognized as major regulators of gene expression. They influence diverse cellular processes ranging from cellular differentiation, proliferation, apoptosis and metabolism to cancer. Bioinformatic approaches and direct cloning methods have identified >3500 miRNAs, including orthologues from various species. Experiments to identify the targets and potential functions of miRNAs in various species are continuing but the recent discovery of virus-encoded miRNAs indicates that viruses also use this fundamental mode of gene regulation. Virus-encoded miRNAs seem to evolve rapidly and regulate both the viral life cycle and the interaction between viruses and their hosts.

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