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
Siliciano RF
中科院分区:
医学1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

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整合的HIV-1基因组存在于潜伏感染的CD 4 + T细胞中活跃转录的宿主基因内。因此,宿主基因的通读转录可能会抑制HIV-1基因的表达,并促进潜伏感染,使病毒在接受治疗的患者中持续存在。为了解决宿主基因通读的影响,我们使用同源重组将HIV-1基因组以任一方向插入到活性宿主基因(HPRT)内含子内的相同位置。构建体被工程化以允许或阻断HPRT的通读转录。通读转录抑制HIV-1基因的表达收敛取向的前病毒,但增强HIV-1基因的表达时,HIV-1是在同一方向的宿主基因。方向对HIV-1基因表达的影响>10倍。由于体内HIV-1整合位点的性质,这种方向依赖性调节可以影响绝大多数感染细胞,并为潜伏期的维持增加了另一种复杂性。
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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