Wnt signaling polarizes cortical actin polymerization to increase daughter cell asymmetry.

Wnt signaling polarizes cortical actin polymerization to increase daughter cell asymmetry.
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Wnt 信号传导极化皮质肌动蛋白聚合以增加子细胞不对称性

DOI:
10.1038/s41421-022-00376-4
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发表时间:
2022-03-01
期刊:
影响因子:
33.5
通讯作者:
Li W
Li W
中科院分区:
生物学1区
文献类型:
--
作者:
Chai Y;Tian D;Zhu Z;Jiang Y;Huang S;Wu D;Ou G;Li W

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有丝分裂纺锤体的不对称定位有助于产生具有不同大小和命运的两个子细胞。在这里,我们调查了不对称分裂的小杆线虫Q神经母细胞谱系。在这种分裂中,从一个不对称定位的纺锤体开始,子细胞大小的差异在胞质分裂过程中不断增加,并且后部较小的子细胞最终发生凋亡。我们发现,Arp 2/3依赖的F-肌动蛋白组装在前部,但不是后部皮质分裂过程中,这表明肌动蛋白聚合产生的不对称扩张力可能会扩大前子细胞。与此相一致,抑制皮质肌动蛋白聚合或人工均衡肌动蛋白组装导致对称细胞分裂。此外,Wnt梯度或其下游组件的破坏损害不对称的皮质肌动蛋白组装,并引起对称分裂。我们的研究结果表明,Wnt信号通过极化分裂细胞中的皮质肌动蛋白聚合来建立子细胞不对称性。
Asymmetric positioning of the mitotic spindle contributes to the generation of two daughter cells with distinct sizes and fates. Here, we investigated an asymmetric division in theCaenorhabditis elegansQ neuroblast lineage. In this division, beginning with an asymmetrically positioned spindle, the daughter-cell size differences continuously increased during cytokinesis, and the smaller daughter cell in the posterior eventually underwent apoptosis. We found that Arp2/3-dependent F-actin assembled in the anterior but not posterior cortex during division, suggesting that asymmetric expansion forces generated by actin polymerization may enlarge the anterior daughter cell. Consistent with this, inhibition of cortical actin polymerization or artificially equalizing actin assembly led to symmetric cell division. Furthermore, disruption of the Wnt gradient or its downstream components impaired asymmetric cortical actin assembly and caused symmetric division. Our results show that Wnt signaling establishes daughter cell asymmetry by polarizing cortical actin polymerization in a dividing cell.
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