A homeostatic clock sets daughter centriole size in flies.

A homeostatic clock sets daughter centriole size in flies.
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DOI:
10.1083/jcb.201801014
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发表时间:
2018-04-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Raff JW
Raff JW
中科院分区:
其他
文献类型:
--
作者:
Aydogan MG;Wainman A;Saurya S;Steinacker TL;Caballe A;Novak ZA;Baumbach J;Muschalik N;Raff JW

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中心粒是高度结构化的细胞器,在不同细胞类型中大小一致。艾多安等人。研究表明,在早期果蝇胚胎中,Plk4 起到稳态时钟的作用,在生长速率和周期之间建立反比关系,以确保子代中心粒生长到正确的大小。中心粒是高度结构化的细胞器,其大小在任何给定的细胞类型中都非常一致。当 Polo 样激酶 4 (Plk4) 将 Ana2/STIL 和 Sas-6 招募到现有“母”中心粒一侧时,新的中心粒就会诞生。然后,这两种蛋白质组装成侧手翻,并向外生长,形成新子体的结构核心。在这里,我们发现,在早期果蝇胚胎中,子代中心粒在早期 S 期以线性速率生长,并在 S 期中后期达到正确大小时突然停止生长。出乎意料的是,侧手翻从其近端开始生长,而 Plk4 决定了中心粒生长的速度和周期:中心粒 Plk4 越活跃,中心粒生长越快,但中心粒 Plk4 失活的速度越快,生长停止。因此,Plk4 充当稳态时钟,在生长速率和周期之间建立反比关系,以确保子中心粒生长到正确的大小。
Centrioles are highly structured organelles of consistent size across cell types. Aydogan et al. show that, in early Drosophila embryos, Plk4 functions as a homeostatic clock, establishing an inverse relationship between growth rate and period to ensure that daughter centrioles grow to the correct size. Centrioles are highly structured organelles whose size is remarkably consistent within any given cell type. New centrioles are born when Polo-like kinase 4 (Plk4) recruits Ana2/STIL and Sas-6 to the side of an existing “mother” centriole. These two proteins then assemble into a cartwheel, which grows outwards to form the structural core of a new daughter. Here, we show that in early Drosophila melanogaster embryos, daughter centrioles grow at a linear rate during early S-phase and abruptly stop growing when they reach their correct size in mid- to late S-phase. Unexpectedly, the cartwheel grows from its proximal end, and Plk4 determines both the rate and period of centriole growth: the more active the centriolar Plk4, the faster centrioles grow, but the faster centriolar Plk4 is inactivated and growth ceases. Thus, Plk4 functions as a homeostatic clock, establishing an inverse relationship between growth rate and period to ensure that daughter centrioles grow to the correct size.
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