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破坏YY1介导的超强增强剂-促进剂循环驱动在哺乳动物干细胞衰老期间的转录组变化
Research square
|June 12, 2025
概括
干细胞衰老导致功能衰退. 转录因子YY1通过维持超强增强剂 (SE) 促进子循环来稳定基因表达,防止人类介质干细胞 (MSC) 中与年龄相关的变化.
科学领域:
- 干细胞生物学 干细胞生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子衰老分子的衰老
背景情况:
- 干细胞衰老的特点是自我更新和分化能力的减少.
- 染色体结构变化在干细胞功能衰退中的作用尚未完全理解.
研究的目的:
- 为了研究超强增强剂 (SE) 促进子循环在人类中介质干细胞 (MSC) 衰老过程中如何重新连接.
- 为了确定关键的调节因素,参与维持基因表达在干细胞衰老期间的稳态.
主要方法:
- 整合了来自年轻人和体外年龄化的人类MSC的转录基因,表观基因和Hi-C数据.
- 绘制SE-promoter循环的地图,并分析它们因年龄而变化的情况.
- 在SE和促进者中的YY1蛋白质丰富性分析在年轻与老年MSC中的SE和促进者.
- 通过敲击实验对YY1作用的功能验证.
主要成果:
- SE目标基因对于MSC身份至关重要,并且受到衰老的显著影响.
- 在老MSC中,YY1已经从SE和促销商中耗尽.
- YY1 枯竭与染色质接触减弱和与年龄相关的基因表达变化相关.
- 年轻MSC中的YY1淘汰模仿了与年龄相关的表达模式,特别是对于SE目标.
结论:
- 改变的SE活动有助于衰老干细胞的功能衰退.
- 在MSC衰老过程中,YY1是稳定SE促进子循环和维持基因表达平衡的关键因素.
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