核细胞的前rRNA空间分布和功能组织
Yu-Hang Pan1, Lin Shan1, Yu-Yao Zhang2
1State Key Laboratory of RNA Innovation, Science and Engineering, New Cornerstone Science Laboratory, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China.
Nature
|July 23, 2025
概括
核细胞组织核糖体的生产,与其结构相关的特定处理步骤. 损坏的5'外部转录间隔处理会影响小子单元输出和核架构,影响细胞增殖.
科学领域:
- 细胞生物学
- 分子生物学
- 进化生物学
背景情况:
- 核是核糖体生物发生的核心,涉及复杂的核糖体RNA (rRNA) 前体的处理.
- 这些处理步骤在核子子结构中的精确空间组织及其适应细胞需求尚未完全理解.
研究的目的:
- 在人类核细胞区内研究核细胞子单元前体 (pre-rRNA) 处理的时空动力学.
- 阐明rRNA前处理,核结构和细胞增殖之间的关系.
- 探索核细胞结构对核糖体生物生成效率的进化影响.
主要方法:
- 在人类核细胞中进行前rRNA处理的时空分析.
- 调查5'外部转录间隔器 (5'ETS) 处理干扰的影响.
- 胚胎细胞和胚胎细胞核结构的比较分析.
主要成果:
- 小子单元 (SSU) 过程在纤维中心 (FC) - 密集纤维元件 (DFC) - 外围密集纤维元件 (PDFC) 域中定位,而大子单元 (LSU) 前rRNA转移到PDFC颗粒组件区域.
- 缓慢增殖的细胞显示5'ETS中心的SSU处理受损,与FC-DFC单元重塑和SSU前体出口减少有关.
- 与羊多层细胞核相比,羊双层细胞核具有明显的5' ETS分布和较慢的前rRNA流量.
- 引入FC/DFC接口对双边核细胞提高了处理效率.
结论:
- 以ETS为中心的处理对于维持核子子结构和有效的SSU生物生成至关重要.
- 核细胞结构,特别是胚胎细胞中嵌套的FC-DFC单元,被优化为rRNA前处理.
- 核细胞结构的进化差异与核糖体生物发生效率的差异有关.
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