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Mbd3/NURD复合体调节胚胎干细胞中5-基甲基酸标记基因的表达
Ozlem Yildirim1, Ruowang Li, Jui-Hung Hung
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Cell
|December 27, 2011
概括
关键的染色体调节剂Mbd3和Brg1,通过对抗性调节基因和影响5-基甲基 (5hmC) 水平来控制胚胎干细胞多能性. 这项研究确定了Mbd3作为5hmC的效应因子.
科学领域:
- 表观遗传学和基因调控
- 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:
- 胚胎干细胞的自我更新和多能性取决于许多染色体调节剂.
- 许多这些监管机构的具体作用仍然不太清楚.
- 了解这些机制对于干细胞研究和再生医学至关重要.
研究的目的:
- 研究Mbd3和Brg1在ES细胞自我更新和多能性中的作用.
- 阐明ES细胞中Mbd3,Brg1和5-基甲基细胞素 (5hmC) 之间的关系.
- 识别ES细胞基因表达控制中的新效应因子和调控策略.
主要方法:
- 在ES细胞中分析染色体调节剂Mbd3和Brg1.
- 通过促进核细胞体占用来研究基因调节.
- 评估Mbd3在5-基甲基细胞素 (5hmC) 生物学中的作用,包括与Tet1和5hmC的同位化.
- 在体外结合试验中,比较了Mbd3对5hmC和5-甲基细胞因的亲和力.
- 评估对内源5hmC水平的Mbd3和Brg1的要求.
主要成果:
- Mbd3 和 Brg1 通过改变促进子核酶体占用率来对抗调节共同的基因.
- Mbd3与Tet1和5hmC共局,其敲除会影响5hmC标记的基因表达.
- Mbd3的局部化取决于Tet1,它优先结合5hmC而不是5-甲基细胞因.
- 在体内维持正常的5hmC水平时,Mbd3和Brg1都至关重要.
结论:
- Mbd3 作为5-基甲基细胞因子 (5hmC) 的效应因子.
- 染色体调节器对抗性调节基因表达是ES细胞中常见的策略.
- 这些发现为多能性和5hmC生物学的表观遗传控制提供了新的见解.
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