Cep57 and Cep57L1 maintain centriole engagement in interphase to ensure centriole duplication cycle.

Cep57 and Cep57L1 maintain centriole engagement in interphase to ensure centriole duplication cycle.
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Cep57和Cep57L1在间期维持中心粒接合,确保中心粒复制周期。

DOI:
10.1083/jcb.202005153
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发表时间:
2021-03-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kitagawa D
Kitagawa D
中科院分区:
其他
文献类型:
--
作者:
Ito KK;Watanabe K;Ishida H;Matsuhashi K;Chinen T;Hata S;Kitagawa D

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Ito等人揭示了中心体蛋白Cep57和Cep57L1在人类细胞的间期协同维持中心粒接合。Cep57和Cep57L1的共缺失诱导间期中心粒过早分离,导致中心粒重复、中心粒扩增和染色体分离错误。中心粒在每个细胞周期中仅在间期复制一次。新形成的中心粒仍然与它们的母体中心粒相连。两个中心粒在有丝分裂结束时分离,这允许中心粒在下一个细胞周期中复制。因此,及时的中心粒脱离对于正确的中心粒复制周期至关重要。然而,在间期中心粒接合的机制知之甚少。在这里,我们表明,Cep57和Cep57L1合作维持中心粒接合间期。Cep57和Cep57L1的共消耗诱导间期中的早熟中心粒脱离,而不损害细胞周期进程。分离的子中心粒在间期以Plk 1依赖的方式转化为中心体。此外,中心粒重复,中心粒数目增加,导致染色体分离错误。总体而言,这些发现表明,维持中心粒接合Cep57和Cep57L1在间期是至关重要的中心粒拷贝数的严格控制,从而正确的染色体分离。
Ito et al. revealed that centrosomal proteins Cep57 and Cep57L1 cooperatively maintain centriole engagement during interphase in human cells. Codepletion of Cep57 and Cep57L1 induces precocious centriole disengagement in interphase, which results in centriole reduplication, centriole amplification, and chromosome segregation errors. Centrioles duplicate in interphase only once per cell cycle. Newly formed centrioles remain associated with their mother centrioles. The two centrioles disengage at the end of mitosis, which licenses centriole duplication in the next cell cycle. Therefore, timely centriole disengagement is critical for the proper centriole duplication cycle. However, the mechanisms underlying centriole engagement during interphase are poorly understood. Here, we show that Cep57 and Cep57L1 cooperatively maintain centriole engagement during interphase. Codepletion of Cep57 and Cep57L1 induces precocious centriole disengagement in interphase without compromising cell cycle progression. The disengaged daughter centrioles convert into centrosomes during interphase in a Plk1-dependent manner. Furthermore, the centrioles reduplicate and the centriole number increases, which results in chromosome segregation errors. Overall, these findings demonstrate that the maintenance of centriole engagement by Cep57 and Cep57L1 during interphase is crucial for the tight control of centriole copy number and thus for proper chromosome segregation.
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