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多能性重编程因子与基因组初始接触的促进者和阻碍者
Abdenour Soufi1, Greg Donahue, Kenneth S Zaret
1Department of Cell and Developmental Biology, Smilow Center for Translational Research, Perelman School of Medicine, University of Pennsylvania, Building 421, Rooms 131-132, 3400 Civic Center Boulevard, Philadelphia, PA 19104-5157, USA.
Cell
|November 20, 2012
概括
转录因子Oct4,Sox2,Klf4和c-Myc (OSKM) 重新编程细胞. 最初的OSKM与基因组结合受到抑制色素的限制,但先驱因素Oct4,Sox2和Klf4促进了重新编程.
科学领域:
- 细胞生物学 细胞生物学
- 基因组学就是基因组学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 通过转录因子重新编程细胞命运是研究的一个关键领域.
- 了解重编程因子对基因组的初始结合事件对于优化效率至关重要.
研究的目的:
- 在纤维细胞重编程到多能性的前48小时内,在人类基因组上绘制Oct4,Sox2,Klf4和c-Myc (OSKM) 的结合图.
- 阐明初始因子结合和重编程过程之间的功能关系.
主要方法:
- 对OSKM结合的全基因组映射.
- 对色素可访问性和表观遗传修饰 (H3K9me3) 的分析.
- 因子结合与基因表达变化的相关性.
主要成果:
- c-Myc意外地促进了Oct4,Sox2和Klf4 (OSK) 的染色质参与.
- Oct4,Sox2和Klf4在促进重编程基因的增强剂中充当先驱因素.
- 大基量级的H3K9me3丰富染色体域阻碍了初始的OSKM结合,并降低了重编程的效率.
结论:
- 最初的OSKM结合是一个复杂的过程,受到先驱因素和表观遗传障碍的影响.
- 克服这些初始结合挑战对于成功的细胞重编程至关重要.
- 这些发现提供了关于诱导多能性期间转录因子结合的动态的见解.
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