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Role of cortical tumour-suppressor proteins in asymmetric division of Drosophila neuroblast

机译:皮质肿瘤抑制蛋白在果蝇神经母细胞不对称分裂中的作用

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摘要

Cellular diversity during development arises in part from asymmetric divisions, which generate two distinct cells by transmitting localized determinants from a progenitor cell into one daughter cell. In Drosophila, neuroblasts undergo typical asymmetric divisions to produce another neuroblast and a ganglion mother cell. At mitosis, neural fate determinants, including Prospero and Numb, localize to the basal cortex, from which the ganglion mother cell buds off; Inscuteable and Bazooka, which regulate spindle orientation, localize apically. Here we show that a tumour-suppressor protein, Lethal giant larvae (Lgl), is essential for asymmetric cortical localization of all basal determinants in mitotic neuroblasts, and is therefore indispensable for neural fate decisions. Lgl, which itself is uniformly cortical, interacts with several types of Myosin to localize the determinants. Another tumour-suppressor protein, Lethal discs large (Dlg), participates in this process by regulating the localization of Lgl. The localization of the apical components is unaffected in lgl or dlg mutants. Thus, Lgl and Dlg act in a common process that differentially mediates cortical protein targeting in mitotic neuroblasts, and that creates intrinsic differences between daughter cells.
机译:发育过程中的细胞多样性部分源于不对称分裂,该分裂通过将定位决定簇从祖细胞传递到一个子细胞中而产生两个不同的细胞。在果蝇中,成神经细胞经历典型的不对称分裂,产生另一个成神经细胞和神经节母细胞。在有丝分裂时,包括Prospero和Numb在内的神经命运决定因素位于基底皮层,神经节母细胞从基底皮层萌芽。不可磨灭的火箭筒和火箭筒,可调节纺锤的方向,其顶端位置。在这里,我们显示了一种肿瘤抑制蛋白,致死性巨幼虫(Lgl),对于有丝分裂成神经细胞中所有基础决定簇的不对称皮质定位都是必不可少的,因此对于神经命运的决定是必不可少的。 Lgl本身是均匀皮层的,它与几种类型的肌球蛋白相互作用以定位决定簇。另一种肿瘤抑制蛋白,致死盘大蛋白(Dlg),通过调节Lgl的定位参与该过程。在lgl或dlg突变体中,顶端成分的定位不受影响。因此,Lgl和Dlg在共同过程中起作用,该过程差异性介导有丝分裂成神经细胞中皮层蛋白的靶向,并在子代细胞之间产生内在差异。

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