ORC1增强了HIV-1 LTR上的压制性表观遗传修饰,以促进HIV-1潜伏性
Mo Zhou1,2, Tao Yang1, Ming Yuan1
1Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China.
Journal of virology
|July 31, 2024
概括
科学家们发现,起源识别综合体1 (ORC1) 通过招募压制性表观遗传因素来维持人类免疫缺陷病毒1型 (HIV-1) 延迟. 削弱ORC1会重新激活潜伏的HIV-1,为HIV-1治愈提供了一个新的治疗点.
科学领域:
- 病毒学和免疫学 病毒学和免疫学
- 表观遗传学和基因调控
- 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) 潜伏感染细胞的储存库是功能治愈的主要障碍.
- 目前的延迟逆转剂 (LRA) 显示出有限的临床疗效,需要确定新的治疗点.
- 了解建立和维持HIV-1潜伏的宿主因素对于开发有效的治疗策略至关重要.
研究的目的:
- 通过使用CRISPR亲和力净化,识别参与维持HIV-1潜伏的新型宿主因素.
- 阐明已识别的宿主因素对HIV-1潜伏有所贡献的机制.
- 评估已识别的宿主因子作为治愈HIV-1的治疗点的潜力.
主要方法:
- 监管元素的CRISPR亲和度净化in situ以选与HIV-1长终端重复 (LTR) 相关的宿主因素.
- 对确定宿主因素在确定和维持HIV-1潜伏期中的作用的分析.
- 在潜伏模型和初级细胞中,在已识别的宿主因子耗尽时验证HIV-1的重新激活.
主要成果:
- 原始识别复合体1 (ORC1) 被确定为一种新型宿主因子,有助于HIV-1潜伏.
- ORC1被增强了HIV-1促进体,并招募了抑制性表观遗传修饰剂 (DNMT1,HDAC1/2) 和基因素标记 (H3K9me3,H3K27me3).
- 在HIV-1感染者的各种细胞模型和初级CD4+T细胞中,ORC1的消耗使潜伏HIV-1重新激活.
- ORC1的液-液相分离 (LLPS) 属性对于其被HIV-1促进体招募至关重要.
结论:
- 原始识别复合体1 (ORC1) 在通过表观遗传抑制来维持HIV-1潜伏性方面发挥着重要作用.
- 对于下一代延迟逆转剂 (LRA) 的开发,ORC1是一个有前途的新目标.
- 针对ORC1提供了一个潜在的治疗策略,以实现对HIV-1的功能治疗.
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