SRA蛋白Np95通过将Dnmt1招募到甲基化DNA中来调解表观遗传遗传
Jafar Sharif1, Masahiro Muto, Shin-ichiro Takebayashi
1Tohoku University Biomedical Engineering Research Organization (TUBERO), 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
Nature
|November 13, 2007
概括
Np95蛋白招募DNA甲基转移酶1 (Dnmt1) 来复制DNA,确保表观遗传遗传. 这种机制对于维持DNA甲基化模式和基因调节至关重要.
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.
- 分子生物学分子生物学
- 基因组学就是基因组学.
背景情况:
- DNA甲基转移酶 (细胞因子-5) 1 (Dnmt1) 维持CpG甲基化,对基因表达,基因组印记和胚胎发生至关重要.
- 在S阶段Dnmt1的作用对于甲基化模式的表观遗传至关重要.
- 在体内将Dnmt1加载到新复制的DNA上的机制尚不清楚.
研究的目的:
- 阐明控制Dnmt1在复制DNA上加载的分子机制.
- 研究NP95 (Uhrf1) 在调解Dnmt1定位和功能中的作用.
主要方法:
- 使用了NP95缺陷的胚胎干细胞和胚胎.
- 研究了Np95通过其SRA域与半甲基化DNA的结合.
- 分析了Np95-Dnmt1复合体的形成及其定位到复制异色染色蛋白.
主要成果:
- Np95局部化到复制异色素蛋白取决于半甲基化DNA.
- Np95与Dnmt1形成复合体,使其更容易被招募到复制异色彩区域.
- 缺少NP95会损害全球和本地DNA甲基化维护,并抑制逆转移子和印记基因.
结论:
- 通过与Dnmt1.1.的相互作用,NP95对于维护DNA甲基化在体内至关重要.
- 半甲基化DNA-Np95-Dnmt1通路是表观遗传的一个关键机制.
- 这一发现澄清了维持全基因组甲基化模式的关键步骤.
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