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PLoS Pathog. 2010 Jun 24;6(6):e1000967. doi: 10.1371/journal.ppat.1000967.

A viral microRNA down-regulates multiple cell cycle genes through mRNA 5'UTRs.

Author information

1
Vaccine and Gene Therapy Institute, Oregon Health & Science University, Portland, Oregon, United States of America. finn.grey@roslin.ed.ac.uk

Abstract

Global gene expression data combined with bioinformatic analysis provides strong evidence that mammalian miRNAs mediate repression of gene expression primarily through binding sites within the 3' untranslated region (UTR). Using RNA induced silencing complex immunoprecipitation (RISC-IP) techniques we have identified multiple cellular targets for a human cytomegalovirus (HCMV) miRNA, miR-US25-1. Strikingly, this miRNA binds target sites primarily within 5'UTRs, mediating significant reduction in gene expression. Intriguingly, many of the genes targeted by miR-US25-1 are associated with cell cycle control, including cyclin E2, BRCC3, EID1, MAPRE2, and CD147, suggesting that miR-US25-1 is targeting genes within a related pathway. Deletion of miR-US25-1 from HCMV results in over expression of cyclin E2 in the context of viral infection. Our studies demonstrate that a viral miRNA mediates translational repression of multiple cellular genes by targeting mRNA 5'UTRs.

PMID:
20585629
PMCID:
PMC2891821
DOI:
10.1371/journal.ppat.1000967
[Indexed for MEDLINE]
Free PMC Article

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