在植入前发育过程中,小鼠胚胎的核体组织
Jitao Zeng1,2, Xiaojuan Tu1, Siming Qu3
1Reproductive Medical Center, Southwest Hospital, Army Medical University, Chongqing, China.
Scientific reports
|July 2, 2025
概括
早期哺乳动物胚胎发育涉及显著的染色质变化. 使用单细胞MNase测序绘制的核细胞定位与对发育至关重要的基因表达相关.
科学领域:
- 发展生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
背景情况:
- 性繁殖启动了胚胎形成,需要广泛的染色质重组来实现全能性.
- 核细胞,基本的染色体单元和表观遗传调节器,在胚胎发生过程中经历重塑,但它们的动力学和作用尚未完全理解.
- 了解核细胞重定位对于破译早期哺乳动物发育中的表观遗传控制至关重要.
研究的目的:
- 在个别哺乳动物胚胎中绘制基因组范围内的核细胞定位和染色质可访问性的地图.
- 研究早期胚胎发生过程中核细胞的动态重新定位机制.
- 阐明核细胞重组对基因调节和发育潜力的生物学影响.
主要方法:
- 采用单细胞MNase测序 (scMNase-seq) 以在单细胞水平上对核细胞定位和染色质可访问性进行分析.
- 集成的H3K4me3定位数据与转录基因概况.
- 分析了与关键基因组特征相关的核体模式,如CTCF位点和转录开始位点 (TSS).
主要成果:
- 早期胚胎 (到4细胞阶段) 中核细胞的定位类似于体细胞模式.
- 在CTCF位点建立核缩和分阶段的建立发生在晚些时候,在形形成期间.
- 核细胞在TSS和侧面区域的稀疏性与必要的植入前发育基因的表达相关,这表明其具有调节作用.
结论:
- 哺乳动物胚胎发生过程中的核细胞重组原理已被系统地描述.
- 核酶体贫乏区域充当调控中心,影响基因组修饰动态.
- 这项研究提供了一个高分辨率的资源,以了解染色体重塑在早期发育中的作用.
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