CEP290 is essential for the initiation of ciliary transition zone assembly.

CEP290 is essential for the initiation of ciliary transition zone assembly.
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CEP290 对于睫状过渡区组装的启动至关重要

DOI:
10.1371/journal.pbio.3001034
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发表时间:
2020-12
期刊:
影响因子:
9.8
通讯作者:
Wei Q
Wei Q
中科院分区:
生物学1区
文献类型:
--
作者:
Wu Z;Pang N;Zhang Y;Chen H;Peng Y;Fu J;Wei Q

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纤毛在胚胎发育和成人体内平衡中发挥着关键作用。纤毛功能障碍会导致各种人类遗传疾病,其中许多疾病是由纤毛“大门”过渡区(TZ)缺陷引起的。进化上保守的 TZ 成分中心体蛋白 290 (CEP290) 是最常突变的人类纤毛病基因,但其在纤毛发生中的作用尚不完全清楚。在这里,我们报告 CEP290 在果蝇 TZ 组装的启动中发挥着重要作用。从机制上讲,CEP290 的 N 末端直接招募 DAZ 相互作用锌指蛋白 1 (DZIP1),然后招募 Chibby (CBY) 和 Rab8 以促进早期睫状膜形成。 CEP290 的完全删除会在 TZ 组装的起始阶段阻断纤毛发生,这可以通过 DZIP1 删除突变体来模拟。值得注意的是,CEP290 N 末端的单独表达恢复了 DZIP1 的 TZ 定位,并随后改善了 cep290 突变体中 TZ 组装起始的缺陷。我们的结果将 CEP290 与 DZIP1-CBY/Rab8 模块联系起来,并揭示了 CEP290 在协调早期睫状膜形成和 TZ 组装中以前未表征的重要功能。纤毛功能障碍会导致各种人类遗传疾病,其中许多疾病是由纤毛“大门”过渡区(TZ)缺陷引起的。果蝇的一项研究表明,纤毛 TZ 核心蛋白 CEP290 协调早期纤毛膜的形成和 TZ 组装; CEP290 的 N 末端招募 DZIP1,DZIP1 又招募 Rab8 和 CBY 以促进早期睫状膜形成。
Cilia play critical roles during embryonic development and adult homeostasis. Dysfunction of cilia leads to various human genetic diseases, including many caused by defects in transition zones (TZs), the “gates” of cilia. The evolutionarily conserved TZ component centrosomal protein 290 (CEP290) is the most frequently mutated human ciliopathy gene, but its roles in ciliogenesis are not completely understood. Here, we report that CEP290 plays an essential role in the initiation of TZ assembly in Drosophila. Mechanistically, the N-terminus of CEP290 directly recruits DAZ interacting zinc finger protein 1 (DZIP1), which then recruits Chibby (CBY) and Rab8 to promote early ciliary membrane formation. Complete deletion of CEP290 blocks ciliogenesis at the initiation stage of TZ assembly, which can be mimicked by DZIP1 deletion mutants. Remarkably, expression of the N-terminus of CEP290 alone restores the TZ localization of DZIP1 and subsequently ameliorates the defects in TZ assembly initiation in cep290 mutants. Our results link CEP290 to DZIP1-CBY/Rab8 module and uncover a previously uncharacterized important function of CEP290 in the coordination of early ciliary membrane formation and TZ assembly. Dysfunction of cilia leads to various human genetic diseases, including many caused by defects in transition zones (TZs), the “gates” of cilia. A study in Drosophila reveals that the cilia TZ core protein CEP290 coordinates early ciliary membrane formation and TZ assembly; the N-terminus of CEP290 recruits DZIP1, which in turn recruits Rab8 and CBY to promote early ciliary membrane formation.
果蝇 chibby 是基体形成和纤毛发生所必需的,但不是 Wg 信号传导所必需的。
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