基因组突变H2A.Z与EBNA1合作,维持爱斯坦-巴尔病毒潜伏表观基因组
Josue Leonardo Castro-Muñoz1, Davide Maestri1, Leena Yoon1
1The Wistar Institute, Philadelphia, PA 19104, USA.
bioRxiv : the preprint server for biology
|February 20, 2025
概括
基因素变体H2A.Z.1通过调节病毒染色质和基因表达来维持爱斯坦-巴尔病毒 (EBV) 延迟是至关重要的. 削减H2A.Z.1会重新激活Lytic基因并增加病毒DNA拷贝数.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 病毒学 病毒学
- 分子生物学分子生物学
背景情况:
- 染色体结构对于调节爱斯坦-巴尔病毒 (EBV) 潜伏时间至关重要.
- 组织素变体H2A.Z.1参与转录启动和DNA复制.
- 了解H2A.Z.1在EBV感染中的作用是控制病毒持续性的关键.
研究的目的:
- 调查H2A.Z.1在EBV染色体调节,基因表达和潜伏感染期间的DNA拷贝数中的功能作用.
- 为了确定H2A.Z.1与EBNA1结合部位在EBV基因组上的相互作用.
- 阐明H2A.Z.1枯竭对病毒基因再激活和表观遗传修饰的影响.
主要方法:
- 通过RNA干扰 (RNAi) 在EBV感染细胞系中消耗H2A.Z.1 (Mutu I BL和SNU719 EBVaGC).
- 染色体免疫沉 (ChIP) 来评估H2A.Z.1,EBNA1,H3K27ac和H4K20me3在病毒调节区域中的丰富度.
- 定量PCR (qPCR) 用于测量病毒DNA拷贝数和基因表达水平.
主要成果:
- 在EBV基因组的EBNA1结合位点 (oriP,Qp) 和活跃的CTCF位点上,H2A.Z.1具有高度丰富性.
- H2A.Z.1 枯竭重新激活了EBV 解毒基因 (ZTA,EAD) 并增加了病毒DNA复制数.
- H2A.Z.1 枯竭减少了EBNA1与病毒事件的结合,并改变了表观遗传标记 (H3K27ac,H4K20me3).
- H2A.Z.1还影响了与myc目标和mTORC1信号相关的细胞基因表达.
结论:
- H2A.Z.1 与EBNA1合作,建立和维持EBV隐性染色质结构.
- H2A.Z.1在潜伏EBV插曲的表观遗传编程中起着至关重要的作用.
- 准H2A.Z.1可能是破坏EBV延迟和控制病毒重新激活的策略.
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