核细胞位和聚合物力学解释了基因组接触在100kB的尺度上
John Corrette1, Jiachun Li2, Hanjuan Shao2
1Mathematical, Computational and Systems Biology, University of California Irvine, Irvine, CA, 92797, United States.
Nucleic acids research
|July 24, 2025
概括
核细胞的定位显著影响基因组的3D组织和基因调节. 我们的研究表明,包括核细胞在内的聚合物力学解释了71%的DNA接触,这表明物理原理控制着基因组结构.
科学领域:
- 基因组学就是基因组学.
- 生物物理学的生物物理.
- 分子生物学分子生物学
背景情况:
- 3D基因组组织对于基因表达调节至关重要.
- 核细胞,DNA围绕着基因组蛋白包裹,影响DNA机制和基因组折叠.
- 了解核素定位在DNA接触中的作用是必不可少的.
研究的目的:
- 为了研究基因位点之间的核细胞定位如何影响DNA接触.
- 确定聚合物力学如何解释这些DNA接触的程度.
- 开发一种用于预测基因组组织的生物物理模型.
主要方法:
- 开发了一种随机的聚合物力学模型,其中包含核酶诱导的DNA扭曲和包裹.
- 结合的ATAC-seq数据用于核细胞在可访问区域的定位,使用电子显微镜进行间距分布.
- 将模型应用于炎症标记基因 (IL-6,IL-15,CXCL9,CXCL10) 并将预测与4C-seq接触数据进行比较.
主要成果:
- 聚合物力学,包括核体,解释了500kb基因组区域内71%的密切DNA接触.
- 核细胞的位置,而不仅仅是数量,对于基因组接触至关重要.
- 该模型准确地预测了刺激前后特定炎症基因的DNA接触.
结论:
- 100kb级的基因组接触受到聚合物力学和核酶体定位的影响.
- 核体在调解DNA接触方面发挥着重要作用,无论是在何处,还是在何处之间.
- 开发的生物物理模型提供了对基因组组织的机制解释,并可以识别积极调节的接触.
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