Polar opposites: Fine-tuning cytokinesis through SIN asymmetry.

Polar opposites: Fine-tuning cytokinesis through SIN asymmetry.
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DOI:
10.1002/cm.21044
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发表时间:
2012-10
期刊:
影响因子:
2.9
通讯作者:
Gould, Kathleen L.
Gould, Kathleen L.
中科院分区:
生物学4区
文献类型:
--
作者:
Johnson, Alyssa E.;McCollum, Dannel;Gould, Kathleen L.

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有丝分裂退出和细胞分裂必须在空间和时间上整合,以促进子细胞之间遗传物质的平等分裂。在分裂酵母(Schizosaccharomyces pombe)中,一个被称为分裂起始网络(SIN)的纺锤极体(SPB)定位信号级联将有丝分裂退出与细胞分裂结合在一起。SIN在许多水平上受到控制,以确保每个细胞周期只在细胞分离DNA后进行一次细胞质分裂。SIN的一个有趣的方面是,在后期,它在两个spb上的活动是不对称的;然而,SIN如何以及为什么是不对称的仍然是难以捉摸的。现在已经确定了许多控制SIN不对称的关键因素,揭示了SIN不对称在调节细胞分裂中的意义。在这篇综述中,我们强调了我们对SIN调控的最新理解,重点是SIN不对称是如何实现的,以及SIN调控的这一方面是如何微调细胞分裂的。
Mitotic exit and cell division must be spatially and temporally integrated to facilitate equal division of genetic material between daughter cells. In the fission yeast, Schizosaccharomyces pombe, a spindle pole body (SPB) localized signaling cascade termed the septation initiation network (SIN) couples mitotic exit with cytokinesis. The SIN is controlled at many levels to ensure that cytokinesis is executed once per cell cycle and only after cells segregate their DNA. An interesting facet of the SIN is that its activity is asymmetric on the two SPBs during anaphase; however, how and why the SIN is asymmetric has remained elusive. Many key factors controlling SIN asymmetry have now been identified, shedding light on the significance of SIN asymmetry in regulating cytokinesis. In this review, we highlight recent advances in our understanding of SIN regulation, with an emphasis on how SIN asymmetry is achieved and how this aspect of SIN regulation fine-tunes cytokinesis.
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