DOT1L相互作用伙伴AF10控制H3K79甲基化和RNA聚合酶II的模式,以保持细胞身份
Coral K Wille1, Edwin N Neumann1, Aniruddha J Deshpande2
1Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, WI 53715, USA.
Stem cell reports
|November 23, 2023
概括
基因表达的强化 基因表达的强化 基因3素79甲基化 (H3K79me) 通过加强基因表达来维持细胞的身份. 删除AF10蛋白质通过改变H3K79me模式来促进诱导多能干细胞 (iPSC) 的形成.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 干细胞生物学 干细胞生物学
- 分子生物学分子生物学
背景情况:
- 基因3素79甲基化 (H3K79me) 与基因表达有关,并阻碍体细胞重编程成为诱导多能干细胞 (iPSC).
- DOT1L 是唯一一个负责所有 H3K79.7 的甲基化状态 (单,二,三) 的酶.
- DOT1L和AF10之间的相互作用对于H3K79me2/3的沉积和维持细胞身份至关重要.
研究的目的:
- 调查不同H3K79甲基化序列在保存细胞身份方面的不同作用.
- 了解H3K79me影响细胞重编程的机制.
- 阐明DOT1L-AF10复合体在表观遗传调节中的功能.
主要方法:
- 用基因操纵 (AF10删除) 和化学方法来研究H3K79甲基化.
- 分析基因素甲基化模式和RNA聚合酶II的分布.
- 诱导多能干细胞 (iPSC) 形成效率的评估.
主要成果:
- 删除AF10删除了H3K79me2/3并将H3K79me1转移到转录开始部位,促进iPSC形成而不改变整体转录水平.
- 丢失AF10导致RNA聚合酶II的重新分布,这是多能性的特征,在高度表达的家政基因中.
- 在基因体上的H3K79me2/3丰富被确定为加强细胞身份的关键机制.
结论:
- H3K79me2 / 3,特别位于基因体上,在维持细胞身份方面发挥着关键作用.
- AF10对于建立和维护细胞识别所需的H3K79me2/3景观至关重要.
- 调节H3K79甲基化模式为控制细胞重编程提供了一个潜在的策略.
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