基因组背景使监管要素对遗传破坏变得敏感
Raquel Ordoñez1,2, Weimin Zhang1,2, Gwen Ellis1,3
1Institute for Systems Genetics, NYU School of Medicine, New York, NY 10016, USA.
bioRxiv : the preprint server for biology
|October 2, 2023
概括
研究增强器功能需要了解基因组背景. 这项研究使用了Big-IN技术来分析Igf2/H19位,揭示了取决于环境的增强剂活性和以前未知的调控元素.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 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:
- 增强器功能通常被孤立地研究,限制了对其在原生基因组环境中的作用的理解.
- 鼠Igf2/H19位是研究增强剂选择性和印记控制的模型系统.
研究的目的:
- 研究Igf2/H19位的调控结构以及基因组背景对增强器功能的影响.
- 探索远程调节元素和CTCF占用在控制基因表达中的作用.
主要方法:
- 利用Big-IN技术针对大型DNA有效载荷的有针对性的集成.
- 设计突变以在印记控制区域 (ICR) 直接指导CTCF占用.
- 在内源和宫外位点 (Hprt) 和交换位点组件 (Igf2/H19与Sox2) 中比较增强剂活性.
主要成果:
- 该Igf2/H19位点包含非特征的远程调节元素,影响增强器功能.
- H19增强器集群需要其本地环境以实现最佳功能,而Sox2位置控制区域 (LCR) 则更加独立于环境.
- 增强器协调在H19和Sox2位点之间有所不同,H19增强器紧密协调,Sox2 LCR更独立地起作用.
结论:
- 基因组背景显著影响增强器功能,即使是对已被充分研究的元素.
- 大IN方法可以对完整的位置进行大规模操纵,以研究位置的架构和功能.
- 这些发现表明,对理解全基因组的增强剂集群有更广泛的意义.
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