Polarized myosin produces unequal-size daughters during asymmetric cell division.

Polarized myosin produces unequal-size daughters during asymmetric cell division.
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DOI:
10.1126/science.1196112
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发表时间:
2010-10-29
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Vale RD
Vale RD
中科院分区:
其他
文献类型:
--
作者:
Ou G;Stuurman N;D'Ambrosio M;Vale RD

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胞质分裂前纺锤体的不对称定位可以产生具有不同命运的不同大小的子细胞。在这里,我们发现了一个不对称的分裂秀丽隐杆线虫Q神经母细胞谱系,开始与一个中心的纺锤体,但产生不同大小的女儿,其中较小的(前)进行凋亡。在此分裂过程中,更多的肌球蛋白II积累前方,这表明不对称的收缩力可能会产生不同大小的女儿。事实上,通过发色团辅助的激光失活,前肌球蛋白的部分失活产生了更对称的分裂,并允许前子体的存活和分化。因此,分裂细胞两侧肌球蛋白活性的平衡可以控制子体的大小和命运。
Asymmetric positioning of the mitotic spindle before cytokinesis can produce different-sized daughter cells that have distinct fates. Here, we found an asymmetric division in the Caenorhabditis elegans Q neuroblast lineage that began with a centered spindle but generated different-sized daughters, the smaller (anterior) of which underwent apoptosis. During this division, more myosin II accumulated anteriorly, suggesting that asymmetric contractile forces might produce different-sized daughters. Indeed, partial inactivation of anterior myosin by chromophore-assisted laser inactivation created a more symmetric division and allowed the survival and differentiation of the anterior daughter. Thus, the balance of myosin activity on the two sides of a dividing cell can govern the size and fate of the daughters.
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