Klp2 and Ase1 synergize to maintain meiotic spindle stability during metaphase I

Klp2 and Ase1 synergize to maintain meiotic spindle stability during metaphase I
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Klp2 和 Ase1 协同维持减数分裂中期 I 纺锤体稳定性

DOI:
10.1101/2020.01.31.929729
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发表时间:
2020-02
影响因子:
4.8
通讯作者:
Fu Chuanhai
Fu Chuanhai
中科院分区:
生物学2区
文献类型:
--
作者:
Zheng Fan;Dong Fenfen;Yu Shuo;Li Tianpeng;Jian Yanze;Nie Lingyun;Fu Chuanhai

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在有丝分裂过程中,纺锤体分离出双向的姐妹染色单体,而在减数分裂I过程中,纺锤体分离出单向的同源染色体。在有丝分裂和减数分裂I期间,是否有类似的分子机制调节纺锤体动力学仍然不清楚。在这里,我们采用活细胞显微镜比较纺锤体动力学的有丝分裂和减数分裂我在分裂酵母细胞,并证明了保守的驱动蛋白-14电机Klp 2在维持中期纺锤体长度在减数分裂我,但不是在有丝分裂过程中发挥了特定的作用。此外,在减数分裂I期间维持中期纺锤体稳定性需要Klp 2和保守的微管交联剂Ase 1之间的协同作用,因为这两种蛋白质的缺乏会导致中期纺锤体稳定性的缺陷加剧。这种协同作用对有丝分裂纺锤体动力学的调节不是必需的。因此,我们的工作揭示了一个新的分子机制下的减数分裂纺锤体动力学和有丝分裂事件的差异调节的理解提供了见解。
The spindle apparatus segregates bi-oriented sister chromatids during mitosis but mono-oriented homologous chromosomes during meiosis I. It has remained unclear if similar molecular mechanisms operate to regulate spindle dynamics during mitosis and meiosis I. Here, we employed live-cell microscopy to compare the spindle dynamics of mitosis and meiosis I in fission yeast cells and demonstrated that the conserved kinesin-14 motor Klp2 plays a specific role in maintaining metaphase spindle length during meiosis I but not during mitosis. Moreover, the maintenance of metaphase spindle stability during meiosis I requires the synergism between Klp2 and the conserved microtubule cross-linker Ase1, as the absence of both proteins causes exacerbated defects in metaphase spindle stability. The synergism is not necessary for regulating mitotic spindle dynamics. Hence, our work reveals a new molecular mechanism underlying meiotic spindle dynamics and provides insights into understanding differential regulation of meiotic and mitotic events.
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