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在胚胎干细胞中TF-DNA识别的双向特异性
Michael Povolotskii1, Maor Yehezkehely1, Oren Ram2
1Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel.
Nucleic acids research
|April 27, 2025
概括
胚胎干细胞 (ESC) 中的关键多能转录因子 (TF) 显示出基于GC含量和短串重复的独特DNA结合偏好. 在ESC分化过程中,c-Myc度调节了TF-DNA结合过渡.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- 转录因子 (TFs) 调节胚胎干细胞 (ESCs) 中的基因表达和发育程序.
- 存在TF-DNA结合的全基因组地图,但TF-DNA识别的原理尚未完全理解.
- 了解TF结合对于破译干细胞中的基因调节至关重要.
研究的目的:
- 阐明管理ESC中TF-DNA识别的分子设计原则.
- 调查在ESC差异化过程中,TF的约束性偏好如何变化.
- 确定c-Myc在调节TF-DNA结合动态中的作用.
主要方法:
- 在不同的基因组GC内容中分析TF-DNA结合偏好.
- 识别可预测TF结合的序列模式 (k-mers) 和短串联重复 (STRs).
- 调查c-Myc-Max异质四聚体的形成及其与多能性因子的竞争.
主要成果:
- 多能性TFs (Oct4,Smad1,Otx2,Srf,Nanog) 表现出双模的GC内容绑定偏好.
- 结合特异性受GC含量,k-mers和STRs的影响.
- c-Myc结合主要是由高GC区域的GC含量和STR驱动的.
- ESC差异化涉及TF-DNA结合格局的过渡,由c-Myc度调节.
- c-Myc-Max异构四基体与Smad1.1.等多能性因子进行竞争.
结论:
- TF-DNA识别涉及复杂的序列特征的相互作用,如GC内容,k-mers和STRs.
- 在ESC分化过程中,c-Myc度是TF结合动态的关键调节者.
- 在分化过程中,TF结合的过渡发生在c-Myc和多能性因子之间没有直接相互作用的情况下.
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