DNA的灵活性调节了转录因子与核体结合的转录因子
Luca Mariani1, Xiao Liu1,2, Kwangwoon Lee1,3
1Division of Genetics, Department of Medicine; Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115.
bioRxiv : the preprint server for biology
|October 28, 2024
概括
先驱转录因子启动染色体开放,但只结合少数点. 核子体内的DNA序列上下文,而不是因子本身,决定了这些关键的先驱因子结合的地方.
科学领域:
- 分子生物学分子生物学
- 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:
- 细胞命运的决定依赖于转录因子 (TFs),这些转录因子将DNA结合起来,以调节基因表达.
- 开拓者TFs启动染色质的开放,使其他调节性蛋白质能够进入.
- 开拓者TF只绑定了其认可站点的一小部分,这表明监管机制正在发挥作用.
研究的目的:
- 调查局部DNA序列背景在调节先驱TF与核细胞结合中的作用.
- 开发一种高通量方法来分析TF-核酶体相互作用.
- 描述七个人类先驱TF的约束性偏好.
主要方法:
- 开发PIONEAR-seq,一种基于测序的生物化学试验,用于TF核酶体结合分析.
- 开创性TF结合核细胞定位序列的高通量表征.
- 与核细胞内合成 (Widom 601) 和基因组DNA序列的TF结合的比较.
主要成果:
- 开拓者TF的结合偏好 (染色体,周期性,结尾结合) 是由周围的核体DNA序列环境决定的.
- 序列上下文,而不是固有的TF,决定结合位置在核细胞.
- 提出了一个模型,其中核体DNA的灵活性和刚性决定了先驱TF结合点.
结论:
- 核体DNA序列背景是开拓者TF结合位置的关键决定因素.
- 核体DNA的物理特性为TFs提供了一个额外的cis-regulatory信息层.
- 了解这些相互作用是解读细胞命运决定和基因调节的关键.
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