RBM14 prevents assembly of centriolar protein complexes and maintains mitotic spindle integrity.

RBM14 prevents assembly of centriolar protein complexes and maintains mitotic spindle integrity.
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DOI:
10.15252/embj.201488979
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发表时间:
2015-01-02
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Kitagawa D
Kitagawa D
中科院分区:
其他
文献类型:
--
作者:
Shiratsuchi G;Takaoka K;Ashikawa T;Hamada H;Kitagawa D

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一个新的中心粒邻近一个预先存在的中心粒的形成在每个细胞周期只发生一次。尽管对基因组的完整性至关重要,但控制中心粒生物发生的机制仍然难以捉摸。在这里,我们确定RBM 14作为一种新的抑制剂组装的中心粒蛋白复合物。人细胞中RBM 14的消耗通过STIL/CPAP复合物的功能诱导中心粒蛋白复合物的异位形成。有趣的是,这种结构的形成似乎不需要通常作为中心粒形成支架的侧手翻结构,而它们可以保留中心粒周围物质和微管成核活性。此外,我们发现,RBM 14耗尽后,异位中心粒蛋白质复合物的一部分又组装成更类似于中心粒的结构,推测是通过将HsSAS-6,车轮组件,并导致多极纺锤体的形成。我们进一步证明,这样的结构组装在细胞质中,即使在存在预先存在的中心粒。这项研究揭示了与中心粒相关的异常结构的异位形成可能有助于基因组不稳定和肿瘤发生的可能性。
Formation of a new centriole adjacent to a pre-existing centriole occurs only once per cell cycle. Despite being crucial for genome integrity, the mechanisms controlling centriole biogenesis remain elusive. Here, we identify RBM14 as a novel suppressor of assembly of centriolar protein complexes. Depletion of RBM14 in human cells induces ectopic formation of centriolar protein complexes through function of the STIL/CPAP complex. Intriguingly, the formation of such structures seems not to require the cartwheel structure that normally acts as a scaffold for centriole formation, whereas they can retain pericentriolar material and microtubule nucleation activity. Moreover, we find that, upon RBM14 depletion, a part of the ectopic centriolar protein complexes in turn assemble into structures more akin to centrioles, presumably by incorporating HsSAS-6, a cartwheel component, and cause multipolar spindle formation. We further demonstrate that such structures assemble in the cytoplasm even in the presence of pre-existing centrioles. This study sheds light on the possibility that ectopic formation of aberrant structures related to centrioles may contribute to genome instability and tumorigenesis.
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