中心细胞独立于C. elegans胚胎中的微管组件,直接控制细胞极性
Carrie R Cowan1, Anthony A Hyman
1Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, Dresden 01307, Germany. cowan@mpi-cbg.de
Nature
|September 3, 2004
概括
精子中心体通过提供信号,在C. elegans胚胎中启动极性,但不需要维持信号. 这种关键的启动信号可能不取决于中心体.
科学领域:
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
- 遗传学 遗传学 是一个
背景情况:
- 在早期发育中建立极性是一个基本的过程,涉及到对称性破坏.
- 在Caenorhabditis elegans中,受精后建立了第一个极性轴,以不对称的PAR蛋白分布为标志.
- 假设精子中心体在定义这个初始极化轴方面发挥了作用.
研究的目的:
- 直接调查中心体在启动和维持C. elegans胚胎中极性的作用.
- 为了确定中心体在极性中的功能是否与其作为微管细胞核子的作用有关.
主要方法:
- 在极化过程之前和期间,对中心体进行激光切除.
- 观察PAR蛋白分布和皮质活动.
- 微管细胞和微管细胞核子马-氨酸的耗尽.
主要成果:
- 中心体对于启动,但不维持胚胎极性至关重要.
- 极性启动与中心体接近皮质和周心质物质组合相关.
- 微管体的枯竭或马管素的丧失并没有阻止极性建立.
结论:
- 中心体通过信号事件作为C. elegans胚胎中极性的关键启动者.
- 这种由中枢细胞介导的极性启动信号似乎独立于其微管核功能.
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