Differential effects of hnRNP D/AUF1 isoforms on HIV-1 gene expression.

Abstract:

:Control of RNA processing plays a major role in HIV-1 gene expression. To explore the role of several hnRNP proteins in this process, we carried out a siRNA screen to examine the effect of depletion of hnRNPs A1, A2, D, H, I and K on HIV-1 gene expression. While loss of hnRNPs H, I or K had little effect, depletion of A1 and A2 increased expression of viral structural proteins. In contrast, reduced hnRNP D expression decreased synthesis of HIV-1 Gag and Env. Loss of hnRNP D induced no changes in viral RNA abundance but reduced the accumulation of HIV-1 unspliced and singly spliced RNAs in the cytoplasm. Subsequent analyses determined that hnRNP D underwent relocalization to the cytoplasm upon HIV-1 infection and was associated with Gag protein. Screening of the four isoforms of hnRNP D determined that, upon overexpression, they had differential effects on HIV-1 Gag expression, p45 and p42 isoforms increased viral Gag synthesis while p40 and p37 suppressed it. The differential effect of hnRNP D isoforms on HIV-1 expression suggests that their relative abundance could contribute to the permissiveness of cell types to replicate the virus, a hypothesis subsequently confirmed by selective depletion of p45 and p42.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Lund N,Milev MP,Wong R,Sanmuganantham T,Woolaway K,Chabot B,Abou Elela S,Mouland AJ,Cochrane A

doi

10.1093/nar/gkr1238

subject

Has Abstract

pub_date

2012-04-01 00:00:00

pages

3663-75

issue

8

eissn

0305-1048

issn

1362-4962

pii

gkr1238

journal_volume

40

pub_type

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