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X染色体重新激活的动态揭示了重编程到多能性的阶段
Vincent Pasque1, Jason Tchieu2, Rahul Karnik3
1Department of Biological Chemistry, Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, Jonsson Comprehensive Cancer Center, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA.
Cell
|December 20, 2014
概括
将体细胞重新编程为诱导多能干细胞 (iPSCs) 涉及逆转X染色体不活化. 这项研究揭示了X染色体再激活 (XCR) 期间的顺序表观遗传变化,DNA脱甲基和Xist沉默对于忠实重编程至关重要.
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.
- 干细胞生物学 干细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 将体细胞重新编程为诱导多能干细胞 (iPSC) 涉及重置表观基因组.
- 在这个过程中,逆转X染色体失活 (XCI) 是一个关键事件.
- 了解X染色体再激活 (XCR) 的逐步机制对于高效的重编程至关重要.
研究的目的:
- 在重编程过程中,研究 X 染色体活性化 (XCR) 过程中的序列表观遗传事件.
- 在诱导多能干细胞 (iPSCs) 的生成过程中识别XCR的关键分子触发物和障碍物.
主要方法:
- 在重编程过程中对非活性X染色体 (Xi) 上表观遗传标志的单细胞分析.
- 在现场跟踪DNA甲基化和Xist表达动态.
- 评估DNA脱甲基化和Xist沉默对XCR的要求.
主要成果:
- 在重编程过程中,不活跃的X染色体 (Xi) 上的表观遗传变化发生在定义的序列中.
- 与发育X无活化相比,一些表观遗传修饰在逆顺序中被逆转.
- DNA甲基化和Xist表达显示长时间的持久性,只有在多能性基因激活后才会被删除.
- 在机理上,XCR依赖于DNA脱甲基和Xist基因沉默.
结论:
- 该研究定义了重编程中细胞命运过渡期间的序列表观遗传中间体.
- 需要通过DNA去甲基化和Xist沉默标记的忠实重编程来启动X染色体的重新激活.
- 建立了一个研究在重编程过程中细胞命运过渡的动态的框架.
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