芝麻 (2023-08-31 22:31):
#paper doi: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8809251/ Parallel analysis of transcription, integration, and sequence of single HIV-1 proviruses 作者发现在个别细胞中,HIV病毒基因表达不会因为受到药物的影响,这种特异性被发现与HIV整合在基因组的区域相关:在非基因区域整合的HIV-1原类病毒表现出显著较低的转录活性,而在染色质某些特殊功能区域附近整合时,HIV病毒的转录活性会显著增强。并且,当HIV整合位点接近激活的组蛋白修饰(H3K4me1、H3K4me3和H3K27ac)时,对于HIV基因转录活性有促进作用。
IF:45.500Q1 Cell, 2022-01-20. DOI: 10.1016/j.cell.2021.12.011 PMID: 35026153
Parallel analysis of transcription, integration, and sequence of single HIV-1 proviruses
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Abstract:
HIV-1-infected cells that persist despite antiretroviral therapy (ART) are frequently considered "transcriptionally silent," but active viral gene expression may occur in some cells, challenging the concept of viral latency. Applying an assay for profiling the transcriptional activity and the chromosomal locations of individual proviruses, we describe a global genomic and epigenetic map of transcriptionally active and silent proviral species and evaluate their longitudinal evolution in persons receiving suppressive ART. Using genome-wide epigenetic reference data, we show that proviral transcriptional activity is associated with activating epigenetic chromatin features in linear proximity of integration sites and in their inter- and intrachromosomal contact regions. Transcriptionally active proviruses were actively selected against during prolonged ART; however, this pattern was violated by large clones of virally infected cells that may outcompete negative selection forces through elevated intrinsic proliferative activity. Our results suggest that transcriptionally active proviruses are dynamically evolving under selection pressure by host factors.
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