在胰腺细胞分化过程中调节CTCF循环的形成
Xiaowen Lyu1,2,3, M Jordan Rowley4, Michael J Kulik5,6
1Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, 30322, USA. xiaowenlyu@xmu.edu.cn.
Nature communications
|October 9, 2023
概括
这项研究揭示了CTCF循环如何在人类干细胞分化成胰腺细胞期间组织色素. 这一动态过程涉及新的和现有的部位,最终控制细胞命运的基因表达.
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:
- 细胞分化需要精确的基因调节,通常涉及增强剂-促进剂相互作用.
- 染色体组织,特别是CTCF介导的循环,在建立细胞特异性基因表达模式方面发挥着关键作用.
- 了解在血统承诺期间3D基因组架构的动态是至关重要的.
研究的目的:
- 研究CTCF介导的染色体组织在人类胚胎干细胞分化成胰腺小岛器官中的作用.
- 阐明细胞系承诺期间CTCF循环形成和分解的机制.
主要方法:
- 在人类胚胎干细胞分化过程中对3D染色质结构的分析.
- 检查CTCF结合点,基因素修饰 (H3K9me3/H3K9me2),DNA脱甲基化和先驱因子的招募.
- 研究凝聚性装载地点 (NIPBL,YY1) 以及它们在循环形成中的作用.
主要成果:
- 在分化过程中,CTCF循环是动态形成和拆卸的.
- 新的CTCF循环是由表观遗传修饰 (脱甲基化) 和先驱因子招募引起的.
- 现有的CTCF站点通过新的凝聚力装载站点重新使用,形成功能循环.
- 新的CTCF循环的形成增强了增强剂-促进剂相互作用和在循环附近的基因转录.
结论:
- 在细胞分化过程中,CTCF和凝聚蛋白在控制基因表达方面发挥着重要作用.
- 通过CTCF调解的动态色素组织对于细胞系承诺至关重要.
- 这项研究提供了关于干细胞命运决定的表观遗传和建筑机制的见解.
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