通过LINE1调节元件,通过组织基因甲基转移酶EHMT2对与全能相关的基因位点进行协调抑制
Kaushiki Chatterjee1, Christopher Mitsuo Uyehara1, Kritika Kasliwal1
1Sanford I. Weill Department of Medicine, Sandra and Edward Meyer Cancer Center, Weill Cornell Medicine, New York, NY, 10065, USA.
染色体抑制剂EHMT2通过抑制关键发育基因,防止小鼠胚胎干细胞 (mESCs) 成为两细胞类细胞 (2CLCs). 它的耗尽促进了过渡,揭示了多能性的机制.
科学领域:
- 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.
- 干细胞生物学 干细胞生物学
背景情况:
- 小鼠胚胎干细胞 (mESCs) 可以去分化为2细胞类细胞 (2CLCs),模仿在胚胎基因组激活 (ZGA) 期间早期哺乳动物发育.
- 了解控制这种过渡的分子机制对于阐明植入前发育至关重要.
研究的目的:
- 研究染色体抑制剂EHMT2在mESC-to-2CLC过渡中的作用.
- 揭示在mESCs中以EHMT2为媒介的基因抑制的独特机制.
主要方法:
- 在mESC中利用一个多用途的等位基因对急性EHMT2蛋白质耗尽.
- 采用有效的免疫沉技术来研究EHMT2的功能.
- 分析了染色体结合模式和参与EHMT2抑制的蛋白质辅因子.
主要成果:
- EHMT2通过从LINE-1元素传播H3K9me2来抑制2CLC特定基因的集群.
- EHMT2对抗DPPA2/4对ERV的招募,抑制ZGA相关的转录.
- EHMT2耗尽增强ZGA转录,并促进mESC-to-2CLC过渡,与其他因素协同作用.
- EHMT2通过ZFP462和非重复增强剂抑制胚胎层基因.
结论:
- 在减弱多能细胞的双向分化潜力方面,EHMT2发挥着至关重要的作用.
- 揭示了EHMT2介导的抑制影响全能细胞转录特征的不同模式.
- 提供了对小鼠全能细胞调节的新机制性见解.
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