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Adenovirus-encoding virus-associated RNAs suppress HDGF gene expression to support efficient viral replication. | LitMetric

Adenovirus-encoding virus-associated RNAs suppress HDGF gene expression to support efficient viral replication.

PLoS One

Laboratory of Molecular Genetics, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo, Japan.

Published: June 2015

AI Article Synopsis

Article Abstract

Non-coding small RNAs are involved in many physiological responses including viral life cycles. Adenovirus-encoding small RNAs, known as virus-associated RNAs (VA RNAs), are transcribed throughout the replication process in the host cells, and their transcript levels depend on the copy numbers of the viral genome. Therefore, VA RNAs are abundant in infected cells after genome replication, i.e. during the late phase of viral infection. Their function during the late phase is the inhibition of interferon-inducible protein kinase R (PKR) activity to prevent antiviral responses; recently, mivaRNAs, the microRNAs processed from VA RNAs, have been reported to inhibit cellular gene expression. Although VA RNA transcription starts during the early phase, little is known about its function. The reason may be because much smaller amount of VA RNAs are transcribed during the early phase than the late phase. In this study, we applied replication-deficient adenovirus vectors (AdVs) and novel AdVs lacking VA RNA genes to analyze the expression changes in cellular genes mediated by VA RNAs using microarray analysis. AdVs are suitable to examine the function of VA RNAs during the early phase, since they constitutively express VA RNAs but do not replicate except in 293 cells. We found that the expression level of hepatoma-derived growth factor (HDGF) significantly decreased in response to the VA RNAs under replication-deficient condition, and this suppression was also observed during the early phase under replication-competent conditions. The suppression was independent of mivaRNA-induced downregulation, suggesting that the function of VA RNAs during the early phase differs from that during the late phase. Notably, overexpression of HDGF inhibited AdV growth. This is the first report to show the function, in part, of VA RNAs during the early phase that may be contribute to efficient viral growth.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4183520PMC
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0108627PLOS

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