集成部位依赖的HIV-1促进体活性塑造了宿主染色体的形状
1Department of Microbial Pathogenesis, Yale University School of Medicine, New Haven, Connecticut 06519, USA jacollora@gmail.com ya-chi.ho@yale.edu.
人类免疫缺陷病毒1型 (HIV-1) 整合通过作为异位增强剂来增强宿主染色体的可访问性和基因表达. 这种整合影响了局部染色质结构,并与远程宿主DNA相互作用,由特定的转录因子介导.
科学领域:
- 病毒学 病毒学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 人类免疫缺陷病毒1型 (HIV-1) 整合到宿主DNA中是病毒复制的一个关键步骤.
- 集成的前病毒可能通过影响染色质结构和基因表达改变宿主细胞功能.
- 了解HIV-1整合如何影响宿主染色质对于开发治疗策略至关重要.
研究的目的:
- 研究HIV-1整合如何影响宿主染色体的可访问性,3D染色体相互作用和基因表达.
- 为了确定是否集成的HIV-1前病毒作为异位增强剂.
- 确定参与HIV-1介导的染色质修饰的机制和宿主因素.
主要方法:
- 单细胞DOGMA-seq用于评估HIV-1表达和染色体可访问性的异质性.
- 克里斯普尔激活 (克里斯普尔a) 和干扰 (克里斯普尔i) 调节HIV-1促进体活性.
- Hi-C和H3K27ac HiChIP用于分析全基因组的3D染色体相互作用.
- 4C-seq用于研究特定的HIV-1-染色体相互作用.
- ATAC-seq用于识别转录因子结合活性.
主要成果:
- 艾滋病毒-1转录与病毒和宿主染色体可访问性相关.
- 艾滋病毒-1整合增加了5到30kb范围内的局部宿主染色质可访问性.
- 艾滋病毒-1与宿主染色体相互作用,距离整合部位的距离高达100-300kb.
- 特定的转录因子家族 (ETS,RUNT,ZNF) 在相互作用部位被丰富.
- 艾滋病毒-1并没有改变全基因组的染色质构造或增强器连接组.
结论:
- 艾滋病毒-1促进体活性以集成位点依赖的方式增强宿主染色质的可访问性.
- 集成的HIV-1前病毒作为异位增强剂,招募转录因子和调节局部染色素.
- 艾滋病毒-1在现有边界内与宿主染色质相互作用,这表明它在塑造局部核架构方面发挥了作用.
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