在静止的HSV-1基因组中产生多个远程cis相互作用的CTCF绝缘体依赖的病毒染色体域
Alyssa Richman1, Sophie Kogut1, Terri Edwards2
1Department of Biomedical and Health Sciences, University of Vermont, Burlington, Vermont, USA.
mBio
|August 28, 2025
概括
在HSV-1基因组中的CCCTC结合因子 (CTCF) 隔离剂组织染色质循环,调节病毒基因表达. 删除CTRL2隔离器会改变这种结构,从而创造出更容易访问的病毒基因组并影响潜伏时间.
科学领域:
- 病毒学
- 表观遗传学
- 分子生物学
背景情况:
- CCCTC结合因子 (CTCF) 隔离剂对于细胞系统中的基因组组织和基因调节至关重要.
- 潜伏的简单疹病毒1 (HSV-1) 基因组含有CTCF绝缘体,可以调节溶性转录.
- HSV-1 CTCF绝缘体在三维 (3D) 基因组组织和染色体循环形成中的作用在很大程度上尚未被探索.
研究的目的:
- 调查HSV-1 CTCF隔离器核染色体循环,以3D方式组织病毒基因组的假设.
- 确定CTRL2绝缘体对病毒染色体结构和基因表达的影响.
- 阐明CTCF介导的3D基因组组织在HSV-1潜伏和重新激活中的作用.
主要方法:
- 使用4C-seq来识别HSV-1基因组中的长距离*cis*相互作用和病毒染色体域.
- 采用UMI-4C-seq,一种使用独特分子标识符的新方法,以量化循环核相互作用.
- 用CTRL2绝缘体和不使用CTRL2绝缘体分析病毒基因组,以评估染色体组织和可访问性的变化.
主要成果:
- 确定了多个长距离的*cis*相互作用,形成病毒染色体域,包括由CTRL2绝缘体核化.
- 删除CTRL2破坏了病毒染色体域,并导致*cis*相互作用峰值增加,相互作用范围更广.
- 在CTRL2被删除的病毒基因组中,差异循环分析显示了更宽容的染色质环境.
结论:
- CTRL2绝缘体是HSV-1中长距离染色体相互作用的关键调节器.
- 删除CTRL2会重塑病毒染色体的形状,增加其可访问性和活力.
- 这些发现为HSV-1基因组的3D组织提供了洞察力,影响了转录程序和延迟,并提出了潜在的治疗目标.
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