热冲击通过动态DNA甲基化和染色质循环诱导替代多化
Emily E Fink1, Yi Zhang2, Briana Santo3
1Genomic Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
Cell stress & chaperones
|May 24, 2025
概括
细胞使用DNA甲基化来调节压力下的替代多基化 (APA),从而调节蛋白质稳定促进的转录. 这种表观遗传机制通过转录因子和染色质循环来动态控制基因表达.
科学领域:
- 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.
- 基因规则 基因规则
背景情况:
- 替代性多氨基化 (APA) 是一个关键的基因调节机制.
- 细胞利用APA在压力下调节蛋白质稳定促进转录.
- 压力诱导的APA的确切机制仍然不完全理解.
研究的目的:
- 研究DNA甲基化在调节细胞压力期间APA中的作用.
- 阐明DNA甲基化,转录因子结合和APA中的染色质循环之间的相互作用.
- 了解细胞如何在应对压力时动态调节多基化异型.
主要方法:
- 在APA控制区域对DNA甲基化模式的分析.
- 在热冲击下研究转录因子结合动态 (HSF1,ATF6,YY1,CTCF).
- 评估TET1和DNMT1的招聘和活动.
- 染色体循环分析.
- 聚基化异形表达特征分析.
主要成果:
- 热冲击会在APA控制区域诱导压力反应转录因子的结合.
- 通过TET1介导的脱甲基化促进了CTCF结合和染色质循环,促进了近位多元A异型表达.
- 在恢复时,DNMT1将该区域重新甲基化,解决染色质循环并重置APA.
- 这种机制可提高蛋白质稳定促进转录的调节,包括DNAJB6的cochaperone locus.
结论:
- 由DNA甲基化调节的APA是细胞应激反应的关键机制.
- 动态表观遗传修饰控制多基化异型选择.
- 这些发现揭示了DNA甲基化,转录因子和基因调节中的染色质循环之间的新型相互作用.
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