Maintaining the proper connection between the centrioles and the pericentriolar matrix requires Drosophila centrosomin.

Maintaining the proper connection between the centrioles and the pericentriolar matrix requires Drosophila centrosomin.
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DOI:
10.1083/jcb.200704081
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发表时间:
2007-08-27
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Raff JW
Raff JW
中科院分区:
其他
文献类型:
--
作者:
Lucas EP;Raff JW

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中心体由两个中心粒组成,周围有一个无定形的中心粒周围基质(PCM),但中心粒和PCM是如何连接的还不清楚。我们发现,在果蝇胚胎中的中心粒,缺乏中心体蛋白Centrosomin(Cnn)可以招募PCM组件,但不能保持适当的附件的PCM。结果,中心粒在胚胎中“火箭”飞行,在分裂间期经常失去与细胞核的连接,在有丝分裂中失去与纺锤体两极的连接。这导致胚胎中严重的有丝分裂缺陷和体细胞中中心粒分离的错误。Cnn相关蛋白CDK5RAP 2与人类的小头畸形有关,但cnn突变体的大脑大小正常,我们只观察到突变体神经母细胞不对称分裂的细微缺陷。我们的结论是,Cnn保持正确的中心粒和PCM之间的连接,这种连接是所需的准确的中心粒分离体细胞,但不是必不可少的不对称分裂的神经母细胞。
Centrosomes consist of two centrioles surrounded by an amorphous pericentriolar matrix (PCM), but it is unknown how centrioles and PCM are connected. We show that the centrioles in Drosophila embryos that lack the centrosomal protein Centrosomin (Cnn) can recruit PCM components but cannot maintain a proper attachment to the PCM. As a result, the centrioles “rocket” around in the embryo and often lose their connection to the nucleus in interphase and to the spindle poles in mitosis. This leads to severe mitotic defects in embryos and to errors in centriole segregation in somatic cells. The Cnn-related protein CDK5RAP2 is linked to microcephaly in humans, but cnn mutant brains are of normal size, and we observe only subtle defects in the asymmetric divisions of mutant neuroblasts. We conclude that Cnn maintains the proper connection between the centrioles and the PCM; this connection is required for accurate centriole segregation in somatic cells but is not essential for the asymmetric division of neuroblasts.
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