RNA interference and HIV-1: hits and misses.

Abstract:

PURPOSE OF REVIEW:RNA interference is a type of nucleic-acid-based immunity used by cells to restrict transposons, transgenes and viruses. The RNA interference machinery targets long double-stranded RNAs to produce short RNAs that arm cellular ribonucleases to degrade foreign RNAs in a sequence-specific manner. Despite this defense, many viruses with RNA genomes, such as HIV-1, replicate seemingly unrestricted in cells. This suggests that viruses may have evolved counter-strategems that negate the host's RNA interference. We review the complex point-counterpoint RNA interference interplays between the human cells and HIV-1. RECENT FINDINGS:RNA interference functions in human cells to restrict viral replication. Recent findings suggest that HIV-1 can evade cellular RNA interference in several ways. First, the virus can mutate its sequence to evade sequence-specific targeting by RNA interference. Second, HIV-1 encodes a viral Tat protein that can partially suppress the cell's RNA interference processing machinery. Finally, HIV-1 encodes a small RNA decoy, TAR, which can sequester a cellular protein named TAR RNA binding protein. The recent discovery that TAR RNA binding protein is a required cofactor for Dicer to process microRNA and small interfering RNA suggests that TAR RNA is another moiety used by HIV-1 to defeat RNA interference. SUMMARY:We discuss stratagems used by HIV-1 and other viruses to defeat the cells' antiviral small interfering RNA/microRNA defenses. We review how viruses might control and regulate host genes by encoding viral microRNA.

journal_name

Curr Opin HIV AIDS

authors

Bennasser Y,Yeung ML,Benkirane M,Jeang KT

doi

10.1097/01.COH.0000221593.49412.56

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

208-11

issue

3

eissn

1746-630X

issn

1746-6318

pii

01222929-200605000-00005

journal_volume

1

pub_type

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