DRhoGEF2 regulates actin organization and contractility in the Drosophila blastoderm embryo.

DRhoGEF2 regulates actin organization and contractility in the Drosophila blastoderm embryo.
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DRHOGEF2调节果蝇胚胚胚中的肌动蛋白组织和收缩力。

DOI:
10.1083/jcb.200407124
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发表时间:
2005-02-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Häcker U
Häcker U
中科院分区:
其他
文献类型:
--
作者:
Padash Barmchi M;Rogers S;Häcker U

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果蝇胚胎的形态发生与肌动蛋白细胞骨架的动态重组有关,该重组是由Rho家族的小GTP酶介导的。通常,Rho1并行控制细胞骨架功能的不同方面,需要复杂的调控水平。我们发现,鸟氨酸三磷酸(GTP)交换因子DRhoGEF2在整个胚胎发育过程中定位于上皮细胞。我们证明,DRhoGEF2在原肠胚形成过程中调节细胞形状的变化,它招募Rho1到肌动蛋白环,并在合胞胚囊胚的核分裂、极细胞形成和细胞化期间调节肌动蛋白的分布和肌球蛋白的收缩能力。我们认为,DRhoGEF2活性通过调节肌球蛋白与肌动蛋白的结合来协调果蝇整个形态发生过程中的收缩肌球蛋白力,形成收缩电缆。我们的结果支持Rho1功能的特定方面受特定GTP交换因子调控的假设。
Morphogenesis of the Drosophila melanogaster embryo is associated with a dynamic reorganization of the actin cytoskeleton that is mediated by small GTPases of the Rho family. Often, Rho1 controls different aspects of cytoskeletal function in parallel, requiring a complex level of regulation. We show that the guanine triphosphate (GTP) exchange factor DRhoGEF2 is apically localized in epithelial cells throughout embryogenesis. We demonstrate that DRhoGEF2, which has previously been shown to regulate cell shape changes during gastrulation, recruits Rho1 to actin rings and regulates actin distribution and actomyosin contractility during nuclear divisions, pole cell formation, and cellularization of syncytial blastoderm embryos. We propose that DRhoGEF2 activity coordinates contractile actomyosin forces throughout morphogenesis in Drosophila by regulating the association of myosin with actin to form contractile cables. Our results support the hypothesis that specific aspects of Rho1 function are regulated by specific GTP exchange factors.
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