The CeCDC-14 phosphatase is required for cytokinesis in the Caenorhabditis elegans embryo.

The CeCDC-14 phosphatase is required for cytokinesis in the Caenorhabditis elegans embryo.
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DOI:
10.1083/jcb.200202054
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发表时间:
2002-09-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Nigg EA
Nigg EA
中科院分区:
其他
文献类型:
--
作者:
Gruneberg U;Glotzer M;Gartner A;Nigg EA

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在所有真核生物中,两个新生细胞的物理分离必须与染色体分离和有丝分裂出口协调。在酿酒酵母和schizosaccharomyces pombe中,这种配位取决于许多基因,这些基因分别在复杂的调节途径中分别称为有丝分裂出口网络和隔膜开始网络。在这里,我们使用RNA介导的干扰探索了潜在的同源生物秀丽隐杆线虫中潜在同源基因的功能。在所有测试的基因中,仅CECDC-14的耗竭,秀丽酵母双特异性磷酸酶CDC14P(裂变酵母中的Clp1/Flp1p)的秀丽隐杆线虫同源物引起了胚胎致死性。我们表明,CECDC-14是细胞因子所必需的,但对于早期胚胎细胞周期的进展可能是可分配的。为了响应CECDC-14的耗竭,胚胎无法建立中央主轴,并且通常在该结构上发现的几种蛋白质被错误定位。 CECDC-14本身位于后期的中心主轴和末期中的中体。它与有丝分裂驱动蛋白ZEN-4共定位,两种蛋白质彼此依赖于正确的定位。这些发现将Cdc14磷酸酶确定为中央纺锤体形成和胞质分裂的重要调节剂。
In all eukaryotic organisms, the physical separation of two nascent cells must be coordinated with chromosome segregation and mitotic exit. In Saccharomyces cerevisiae and Schizosaccharomyces pombe this coordination depends on a number of genes that cooperate in intricate regulatory pathways termed mitotic exit network and septum initiation network, respectively. Here we have explored the function of potentially homologous genes in a metazoan organism, Caenorhabditis elegans, using RNA-mediated interference. Of all the genes tested, only depletion of CeCDC-14, the C. elegans homologue of the budding yeast dual-specificity phosphatase Cdc14p (Clp1/Flp1p in fission yeast), caused embryonic lethality. We show that CeCDC-14 is required for cytokinesis but may be dispensable for progression of the early embryonic cell cycles. In response to depletion of CeCDC-14, embryos fail to establish a central spindle, and several proteins normally found at this structure are mislocalized. CeCDC-14 itself localizes to the central spindle in anaphase and to the midbody in telophase. It colocalizes with the mitotic kinesin ZEN-4, and the two proteins depend on each other for correct localization. These findings identify the CDC14 phosphatase as an important regulator of central spindle formation and cytokinesis in a metazoan organism.
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