通过SWI/SNF复杂介导的染色质重塑促进B型肝炎病毒ccccDNA转录
Xiaoxue Yuan1,2,3,4, Wenqian Geng5,6,7,8, Jiyin Wang5,6,7,8
1National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, 100015, China. yuanxiaoxue1@ccmu.edu.cn.
Science China. Life sciences
|November 24, 2025
概括
哺乳动物SWI/SNF染色体重塑剂,包括BRG1 (SMARCA4) 和BRD9,对于乙型肝炎病毒 (HBV) 协同封闭圆形DNA (cccDNA) 转录至关重要. 准这些复合体为慢性HBV感染的功能治愈提供了潜在的战略.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 慢性乙型肝炎 (CHB) 的持久性与肝炎B病毒 (HBV) 在肝细胞内的共价封闭圆形DNA (cccDNA) 有关.
- 通过染色质结构进行ccccDNA转录调节和病毒持久性的机制尚未完全理解.
- 哺乳动物SWI/SNF染色体重塑复合物参与调节基因表达.
研究的目的:
- 研究哺乳动物SWI/SNF染色体重塑复合物的调节ccccDNA转录活性中的作用.
- 为了确定参与由ccDNA调解的HBV复制的特定宿主因素.
主要方法:
- 使用药理抑制剂和遗传技术 (siRNA,PROTAC AU15330) 来研究SWI/SNF复合体.
- 使用染色体可访问性测试来评估BRG1 (SMARCA4) 枯竭对ccDNA的影响.
- 研究了涉及HBV X蛋白 (HBx),BAF155和转录因子YY1.1.的蛋白质蛋白相互作用.
主要成果:
- 确定了BRG1 (SMARCA4) 和BRD9作为HBV复制和ccDNA转录的关键宿主因素.
- 过度表达SMARCA4增强了HBV的传播;它的枯竭显著降低了病毒转录和蛋白质水平.
- BRG1 (SMARCA4) 枯竭导致ccDNA调节区域的染色质紧缩;BRD9抑制也破坏了ccDNA转录.
结论:
- SWI/SNF复合体,通过涉及乙化的协调性正规和非正规功能,是ccccDNA转录的关键调节者.
- HBx与BAF155和YY1相互作用,以促进SWI/SNF与病毒染色质的结合.
- 准SWI/SNF复合体是一个有希望的治疗策略,可以消除ccccDNA储存,并实现对CHB的功能治疗.
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