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首页> 外文期刊>Neuron >Huntingtin is required for mitotic spindle orientation and mammalian neurogenesis.
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Huntingtin is required for mitotic spindle orientation and mammalian neurogenesis.

机译:亨廷顿蛋白是有丝分裂纺锤体定向和哺乳动物神经发生所必需的。

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摘要

Huntingtin is the protein mutated in Huntington's disease, a devastating neurodegenerative disorder. We demonstrate here that huntingtin is essential to control mitosis. Huntingtin is localized at spindle poles during mitosis. RNAi-mediated silencing of huntingtin in cells disrupts spindle orientation by mislocalizing the p150(Glued) subunit of dynactin, dynein, and the large nuclear mitotic apparatus NuMA protein. This leads to increased apoptosis following mitosis of adherent cells in vitro. In vivo inactivation of huntingtin by RNAi or by ablation of the Hdh gene affects spindle orientation and cell fate of cortical progenitors of the ventricular zone in mouse embryos. This function is conserved in Drosophila, the specific disruption of Drosophila huntingtin in neuroblast precursors leading to spindle misorientation. Moreover, Drosophila huntingtin restores spindle misorientation in mammalian cells. These findings reveal an unexpected role for huntingtin in dividing cells, with potential important implications in health and disease.
机译:亨廷顿蛋白是在亨廷顿氏病(一种破坏性的神经退行性疾病)中突变的蛋白质。我们在这里证明亨廷顿蛋白对于控制有丝分裂至关重要。亨廷顿蛋白在有丝分裂期间位于纺锤极。 RNAi介导的亨廷顿蛋白在细胞中的沉默通过使动力蛋白,动力蛋白和大型核有丝分裂装置NuMA蛋白的p150(Glued)亚基错位来破坏纺锤体定向。这导致体外粘附细胞的有丝分裂后凋亡增加。 RNAi或通过消融Hdh基因使亨廷顿蛋白在体内失活会影响小鼠胚胎心室区皮质祖细胞的纺锤体定向和细胞命运。果蝇这种功能在果蝇中是保守的,果蝇亨廷顿蛋白在神经母细胞前体中的特异性破坏导致纺锤体方向错误。此外,果蝇亨廷顿蛋白恢复了哺乳动物细胞中的纺锤体定向错误。这些发现揭示了亨廷顿蛋白在分裂细胞中具有意想不到的作用,对健康和疾病具有潜在的重要意义。

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