多维剖析揭示了GATA1调制的特定阶段染色质状态和人类红色素形成过程中的功能关联
Dong Li1,2, Xin-Ying Zhao1,2, Shuo Zhou1,2
1Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, School of Life Sciences, Peking University, Beijing 100871, China.
Nucleic acids research
|May 31, 2023
概括
在红状腺发育期间,3D基因组的动态变化,特别是由GATA1等转录因子协调的增强活性,驱动特定阶段的基因表达和细胞状态过渡.
科学领域:
- 基因组学就是基因组学.
- 发展生物学 发展生物学
- 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:
- 哺乳动物的红色素发育包括不同的阶段:造血干细胞和原始细胞 (HSPC),红色素原始细胞 (Ery-Pro) 和红色素前体 (Ery-Pre).
- 在红色素形成过程中建立特定阶段的转录程序的3D基因组改变的精确机制尚未完全理解.
研究的目的:
- 为了研究人类红色球体发育过程中3D基因组景观的动态变化.
- 阐明转录因子,特别是GATA1在编排增强剂-促进剂相互作用和基因表达变化的作用.
主要方法:
- 在定义的人类红色素细胞种群中,在多个层次上分析染色质景观.
- 评估H3K27Ac标记增强剂和增强剂-促进剂循环中的动态变化.
- 在监管元素中调查转录因子占用率,包括GATA1.
主要成果:
- 虽然全球基因组组织 (组件,TADs) 保持稳定,但大约50%的H3K27Ac增强剂在HSPC和Ery-Pre阶段之间表现出动态活性.
- 特定阶段的转录因子在增强器中得到了丰富,表明它们在重新连接增强器连接组中的作用.
- 在Ery-Pre阶段,在远端区域的GATA1结合促进了红色球体转录输出,其破坏取消了局部重新连接和基因表达.
结论:
- 动态增强剂活性和转录因子介导的3D基因组重新连接对于编排红色素形成至关重要.
- GATA1在驱动红状腺基因表达和维持细胞状态方面发挥着关键作用,其敲击会暂时将细胞恢复到早期的原始细胞阶段.
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