PIASgamma is required for faithful chromosome segregation in human cells.

PIASgamma is required for faithful chromosome segregation in human cells.
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DOI:
10.1371/journal.pone.0000053
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发表时间:
2006-12-20
期刊:
影响因子:
3.7
通讯作者:
Clarke DJ
Clarke DJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Díaz-Martínez LA;Giménez-Abián JF;Azuma Y;Guacci V;Giménez-Martín G;Lanier LM;Clarke DJ

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中期-后期转换的精确性确保了稳定的遗传。纺锤体检查点阻止后期开始,直到最后一条染色体在中期板上生物定向,然后姐妹染色单体之间的键被去除,分离的染色单体分离到纺锤体两极。但是,姐妹分离是如何引发的还不完全清楚。我们鉴定了皮亚斯γ作为及时有效分离姐妹染色单体所需的人E3 sumo连接酶。在缺乏皮亚斯γ的细胞中,正常的中期板形成,但纺锤体检查点被激活,导致延长的中期阻滞。即使hSgo 1的缺失去除了粘着蛋白,姐妹染色单体仍然保持凝聚,因为DNA链在着丝粒处持续存在。皮亚斯γ耗尽的细胞不能将拓扑异构酶II正确地定位在着丝粒或有丝分裂染色体的核心中,从而在皮亚斯γ和拓扑异构酶II之间提供功能性联系。皮亚斯γ将拓扑异构酶II引导至需要在后期之前有效去除DNA链的特定染色体区域。缺乏这种活性激活纺锤体检查点,保护细胞不分离。因为在没有皮亚斯γ和没有粘着蛋白的情况下,DNA链化持续存在,所以链化和粘着蛋白环的去除必须平行调节。
The precision of the metaphase-anaphase transition ensures stable genetic inheritance. The spindle checkpoint blocks anaphase onset until the last chromosome biorients at metaphase plate, then the bonds between sister chromatids are removed and disjoined chromatids segregate to the spindle poles. But, how sister separation is triggered is not fully understood. We identify PIASγ as a human E3 sumo ligase required for timely and efficient sister chromatid separation. In cells lacking PIASγ, normal metaphase plates form, but the spindle checkpoint is activated, leading to a prolonged metaphase block. Sister chromatids remain cohered even if cohesin is removed by depletion of hSgo1, because DNA catenations persist at centromeres. PIASγ-depleted cells cannot properly localize Topoisomerase II at centromeres or in the cores of mitotic chromosomes, providing a functional link between PIASγ and Topoisomerase II. PIASγ directs Topoisomerase II to specific chromosome regions that require efficient removal of DNA catenations prior to anaphase. The lack of this activity activates the spindle checkpoint, protecting cells from non-disjunction. Because DNA catenations persist without PIASγ in the absence of cohesin, removal of catenations and cohesin rings must be regulated in parallel.
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