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Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
建筑蛋白质子类塑造了基因组在血统承诺期间的3D组织
Jennifer E Phillips-Cremins1, Michael E G Sauria, Amartya Sanyal
1Department of Biology, Emory University, Atlanta, GA 30322, USA.
Cell
|May 28, 2013
概括
染色体组织在细胞发育过程中发生变化,像CTCF,Mediator和cohesin这样的结构蛋白在不同尺度上塑造基因组结构. 这种3D架构对于基因调节和细胞命运至关重要.
科学领域:
- 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.
- 发展生物学 发展生物学
背景情况:
- 细胞命运的确定依赖于协调的基因组和表观基因组活动.
- 了解3D染色体结构是解读发育过程中基因调节的关键.
研究的目的:
- 在胚胎干细胞和神经前代细胞中绘制高分辨率的3D染色质结构.
- 为了研究染色体组织在分化过程中如何发生变化.
- 确定建筑蛋白在塑造基因组结构中的作用.
主要方法:
- 生成高分辨率的3D基因组架构地图.
- 分析了七个基因组位置的染色质相互作用.
- 调查CCCTC约束因子 (CTCF),调解员和凝聚力的作用.
- 在胚胎干细胞中进行基因淘汰实验 (Smc1,Med12).
主要成果:
- 观察到3D染色体相互作用的层次组织,在分化过程中在亚兆基尺度上有显著的重组.
- 在不同的相互作用尺度上,CTCF,Mediator和cohesin的特定组合得到了丰富.
- CTCF/凝聚力长距离相互作用,可能形成不变子域.
- 调解者/凝聚性桥梁短程增强剂-促进剂相互作用.
- 在凝聚素介导的相互作用中,Smc1或Med12的 Knockdown 破坏了空间结构,并降低了基因的调节.
结论:
- 细胞类型特定的染色质组织发生在亚兆基尺度上.
- 建筑蛋白 (CTCF,调解者,凝聚) 在塑造基因组结构方面发挥着层次性的作用.
- 这种结构的破坏会影响基因表达和细胞命运.
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