SWI/SNF核焦点脚手架外围基因枢纽用于昼夜染色质控制
bioRxiv : the preprint server for biology
|February 12, 2026
概括
这种SWI/SNF (Switch/Sucrose Non-Fermentable) 染色体重塑复合体,特别是Moira (MOR),充当一个周核支架. 这种支架关闭了染色质的可访问性,将昼夜蛋白质振荡与基因表达节奏和行为联系起来.
科学领域:
- 细胞和分子生物学 细胞和分子生物学
- 遗传学和基因组学 在
- 时间生物学 时间生物学
背景情况:
- 动态昼夜节律是从静态核架构中产生的,这是一个根本的问题.
- 核组织中SWI/SNF染色体重塑复合物的分布和功能尚未完全理解.
研究的目的:
- 研究SWI/SNF复合体,特别是Moira (MOR) 在将昼夜节律与核组织联系起来的作用.
- 阐明MOR如何影响染色质可访问性和基因表达节奏.
主要方法:
- 在Drosophila中使用了内源标记的Moira (MOR).
- 使用DNA-FISH和ATAC-seq分析基因聚类,MOR定位和染色质可访问性.
- 评估了MOR枯竭对昼夜基因表达和行为的影响.
主要成果:
- MOR局限于离散的周核焦点,由Otefin蛋白定,与扩散分布模型相反.
- 时钟调节的基因聚集在外围枢纽中,与MOR焦点共同定位.
- 尽管核心时钟蛋白的振荡是完整的,但MOR枯竭会在时钟调节的位置取消染色质可访问性节奏,导致行为失律.
结论:
- 含有MOR的SWI/SNF焦点形成了一个稳定的周核支架,对于关闭节律色素可访问性至关重要.
- 这种核组织对于将短暂的蛋白质振荡转化为高幅度的转录节奏和行为输出至关重要.
- 循环计时是一个空间有组织的过程,涉及核拓,将时间信息与生物输出联系起来.
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