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A mirror-symmetric cell division that orchestrates neuroepithelial morphogenesis

机译:镜面对称的细胞分裂,协调神经上皮形态发生

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The development of cell polarity is an essential prerequisite for tissue morphogenesis during embryogenesis, particularly in the development of epithelia. In addition, oriented cell division can have a powerful influence on tissue morphogenesis. Here we identify a novel mode of polarized cell division that generates pairs of neural progenitors with mirror-symmetric polarity in the developing zebrafish neural tube and has dramatic consequences for the organization of embryonic tissue. We show that during neural rod formation the polarity protein Pard3 is localized to the cleavage furrow of dividing progenitors, and then mirror-symmetrically inherited by the two daughter cells. This allows the daughter cells to integrate into opposite sides of the developing neural tube. Furthermore, these mirror-symmetric divisions have powerful morphogenetic influence: when forced to occur in ectopic locations during neurulation, they orchestrate the development of mirror-image pattern formation and the consequent generation of ectopic neural tubes.
机译:细胞极性的发育是胚胎发生过程中组织形态发生的必要先决条件,特别是在上皮细胞的形成过程中。另外,定向的细胞分裂可以对组织形态发生有很大的影响。在这里,我们确定了一种极化细胞分裂的新模式,该模式在成对的斑马鱼神经管中生成具有镜像对称极性的成对神经祖细胞,并对胚胎组织的组织产生重大影响。我们显示,在神经棒形成过程中,极性蛋白Pard3定位于分裂祖细胞的切割沟,然后由两个子细胞镜像对称地遗传。这允许子细胞整合到正在发育的神经管的相对两侧。此外,这些镜像对称的划分具有强大的形态发生影响:当在神经形成过程中被迫在异位发生时,它们会协调镜像模式的形成和异位神经管的产生。

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