预先确定的ATF4占用和染色体组织指示在综合应激反应期间选择性转录激活
Peipei Jiang1,2, Qian Bian3,4
1Shanghai Institute of Precision Medicine, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Nature communications
|October 29, 2025
概括
细胞通过综合应激反应 (ISR) 在压力期间快速调整基因表达. 这项研究表明,先前存在的转录因子结合和染色质结构在很大程度上预先确定了细胞应激反应.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 细胞应激反应的应激反应
背景情况:
- 细胞必须快速适应基因表达,以在压力下维持平衡.
- 在压力期间控制细胞转录重塑的机制尚未完全理解.
研究的目的:
- 在综合应激反应 (ISR) 期间调查转录组,表观遗传学和3D基因组组织的动态变化.
- 阐明细胞应激期间转录调节的基础分子机制.
主要方法:
- 对转录组,表观遗传学和3D基因组组织的分析.
- 染色体免疫沉测序 (ChIP-seq) 用于识别转录因子结合部位.
- 基因表达概况. 基因表达概况.
主要成果:
- 综合应激反应 (ISR) 诱导在6小时内引起广泛的转录变化,与ATF4结合增加有关.
- 即使没有压力,ATF4也会与许多基因结合,为它们的增强激活做准备.
- 在ISR过程中ATF4介导的基因激活涉及CEBPγ重新分配到ATF4结合的区域,形成ATF4/CEBPγ异构体,而不是乙化,可访问性或循环的变化.
- CEBPγ的目标是ATF4占用的区域和特定的高阶染色体结构.
结论:
- 在ISR期间的转录反应在很大程度上是由内在的色素特性和先前存在的转录因子结合预先连接的.
- 在ISR期间,CEBPγ再分配是ATF4介导基因激活的关键机制.
- 研究结果提供了关于压力反应中转录重塑的见解.
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