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Centriole assembly in Caenorhabditis elegans

机译:秀丽隐杆线虫的中心体组装

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Centrioles are necessary for flagella and cilia formation(1,2), cytokinesis(3,4), cell-cycle control(5) and centrosome organization/ spindle assembly(6). They duplicate once per cell cycle, but the mechanisms underlying their duplication remain unclear. Here we show using electron tomography of staged C. elegans one-cell embryos that daughter centriole assembly begins with the formation and elongation of a central tube followed by the peripheral assembly of nine singlet microtubules. Tube formation and elongation is dependent on the SAS-5 and SAS-6 proteins, whereas the assembly of singlet microtubules onto the central tube depends on SAS-4. We further show that centriole assembly is triggered by an upstream signal mediated by SPD-2 and ZYG-1. These results define a structural pathway for the assembly of a daughter centriole and should have general relevance for future studies on centriole assembly in other organisms.
机译:鞭毛和纤毛的形成(1,2),胞质分裂(3,4),细胞周期控制(5)和中心体组织/纺锤体组装(6)都需要离心。它们每个细胞周期复制一次,但是其复制的基础机制仍不清楚。在这里,我们显示了使用分阶段的秀丽隐杆线虫单细胞胚胎的电子断层扫描技术,子中心细胞组装始于中央管的形成和伸长,然后是九个单线态微管的外围组装。管的形成和伸长取决于SAS-5和SAS-6蛋白,而单线态微管在中央管上的组装取决于SAS-4。我们进一步表明,由SPD-2和ZYG-1介导的上游信号触发了中心粒装配。这些结果为子代中心粒的组装定义了一条结构途径,并且应该与其他生物体中的中心粒组装的未来研究具有普遍的相关性。

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