SCAR is a primary regulator of Arp2/3-dependent morphological events in Drosophila.

SCAR is a primary regulator of Arp2/3-dependent morphological events in Drosophila.
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DOI:
10.1083/jcb.200109057
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发表时间:
2002-02-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schejter ED
Schejter ED
中科院分区:
其他
文献类型:
--
作者:
Zallen JA;Cohen Y;Hudson AM;Cooley L;Wieschaus E;Schejter ED

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Arp 2/3复合物及其激活剂Scar/WAVE和Wiskott-Aldrich综合征蛋白(WASp)在体外促进肌动蛋白聚合,并已被提出影响体内细胞的形状和运动性。我们证明,果蝇疤痕同源物,SCAR,定位于肌动蛋白丰富的结构,并需要在整个发展过程中的多种细胞类型的正常细胞形态。特别是,SCAR的功能是必不可少的细胞质组织在胚盘,轴突发育在中枢神经系统,卵室结构在卵子发生过程中,和成年人的眼睛形态。Arp 2/3复合物的亚基具有高度相似的发育要求。在胚盘中,SCAR和Arp 2/3突变导致皮质丝状肌动蛋白的量减少和动态调节的肌动蛋白结构的破坏。值得注意的是,单个果蝇WASp同源物Wasp在很大程度上与这些众多的Arp 2/3依赖性功能相关,而SCAR对Wasp和Arp 2/3发挥重要作用的细胞命运决定没有贡献。这些结果确定SCAR作为一个主要组成部分的Arp 2/3依赖的细胞形态在果蝇的发展,并表明Arp 2/3复合物可以管理不同的细胞生物学事件响应SCAR和黄蜂调节。
The Arp2/3 complex and its activators, Scar/WAVE and Wiskott-Aldrich Syndrome protein (WASp), promote actin polymerization in vitro and have been proposed to influence cell shape and motility in vivo. We demonstrate that the Drosophila Scar homologue, SCAR, localizes to actin-rich structures and is required for normal cell morphology in multiple cell types throughout development. In particular, SCAR function is essential for cytoplasmic organization in the blastoderm, axon development in the central nervous system, egg chamber structure during oogenesis, and adult eye morphology. Highly similar developmental requirements are found for subunits of the Arp2/3 complex. In the blastoderm, SCAR and Arp2/3 mutations result in a reduction in the amount of cortical filamentous actin and the disruption of dynamically regulated actin structures. Remarkably, the single Drosophila WASp homologue, Wasp, is largely dispensable for these numerous Arp2/3-dependent functions, whereas SCAR does not contribute to cell fate decisions in which Wasp and Arp2/3 play an essential role. These results identify SCAR as a major component of Arp2/3-dependent cell morphology during Drosophila development and demonstrate that the Arp2/3 complex can govern distinct cell biological events in response to SCAR and Wasp regulation.
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