Orientation-dependent regulation of integrated HIV-1 expression by host gene transcriptional readthrough.
Orientation-dependent regulation of integrated HIV-1 expression by host gene transcriptional readthrough.
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DOI:
10.1016/j.chom.2008.06.008
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发表时间:
2008-08-14
影响因子:
30.3
通讯作者:
Siliciano RF
中科院分区:
文献类型:
--
作者:
Han Y;Lin YB;An W;Xu J;Yang HC;O'Connell K;Dordai D;Boeke JD;Siliciano JD;Siliciano RF
Integrated HIV-1 genomes are found within actively transcribed host genes in latently infected CD4+ T cells. Readthrough transcription of the host gene might therefore suppress HIV-1 gene expression and promote the latent infection that allows viral persistence in patients on therapy. To address the effect of host gene readthrough, we used homologous recombination to insert HIV-1 genomes in either orientation into an identical position within an intron of an active host gene (HPRT). Constructs were engineered to permit or block readthrough transcription of HPRT. Readthrough transcription inhibited HIV-1 gene expression for convergently orientated provirus but enhanced HIV-1 gene expression when HIV-1 was in the same orientation as the host gene. Orientation had a >10 fold effect on HIV-1 gene expression. Due to the nature of HIV-1 integration sites in vivo, this orientation-dependent regulation can influence the vast majority of infected cells and adds another complexity to the maintenance of latency.
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