Aurora A-dependent CENP-A phosphorylation at inner centromeres protects bioriented chromosomes against cohesion fatigue.

Aurora A-dependent CENP-A phosphorylation at inner centromeres protects bioriented chromosomes against cohesion fatigue.
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DOI:
10.1038/s41467-018-04089-9
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发表时间:
2018-05-14
影响因子:
16.6
通讯作者:
Jaulin C
Jaulin C
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Eot-Houllier G;Magnaghi-Jaulin L;Fulcrand G;Moyroud FX;Monier S;Jaulin C

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在有丝分裂过程中,持续的纺锤体张力作用于姐妹着丝粒,最终导致姐妹染色单体凝聚力的不协调丧失,这种现象称为“凝聚疲劳”。我们报告说,极光A依赖的磷酸化的丝氨酸7的着丝粒组蛋白变体CENP-A(p-CENP-AS 7)保护双向染色体的凝聚力疲劳。CENP-A(CENP-AS 7A)的非磷酸化版本的表达削弱了姐妹染色单体凝聚力只有当姐妹着丝粒处于紧张状态下,提供了第一个证据的调节机制参与保护被动凝聚力损失。与该观察结果一致,在内部着丝粒处检测到p-CENP-AS 7,其中其形成离散结构域。极光A的消耗或抑制phenocopies的CENP-AS 7A的表达,我们表明,极光A被招募到着丝粒中的Bub 1依赖的方式。我们建议,极光A依赖的磷酸化CENP-A在内部着丝粒保护染色体对张力诱导的凝聚力疲劳,直到最后动粒连接到纺锤体微管。在有丝分裂过程中,持续的纺锤体张力作用于姐妹着丝粒,导致姐妹染色单体凝聚力的丧失,这被称为凝聚力疲劳。在这里,作者表明,极光A依赖的磷酸化CENP-A在内部着丝粒保护双向染色体对凝聚疲劳。
Sustained spindle tension applied to sister centromeres during mitosis eventually leads to uncoordinated loss of sister chromatid cohesion, a phenomenon known as “cohesion fatigue.” We report that Aurora A-dependent phosphorylation of serine 7 of the centromere histone variant CENP-A (p-CENP-AS7) protects bioriented chromosomes against cohesion fatigue. Expression of a non-phosphorylatable version of CENP-A (CENP-AS7A) weakens sister chromatid cohesion only when sister centromeres are under tension, providing the first evidence of a regulated mechanism involved in protection against passive cohesion loss. Consistent with this observation, p-CENP-AS7 is detected at the inner centromere where it forms a discrete domain. The depletion or inhibition of Aurora A phenocopies the expression of CENP-AS7A and we show that Aurora A is recruited to centromeres in a Bub1-dependent manner. We propose that Aurora A-dependent phosphorylation of CENP-A at the inner centromere protects chromosomes against tension-induced cohesion fatigue until the last kinetochore is attached to spindle microtubules. Sustained spindle tension applied to sister centromeres during mitosis leads to loss of sister chromatid cohesion which is known as cohesion fatigue. Here the authors show that Aurora A-dependent phosphorylation of CENP-A at the inner centromeres protects bioriented chromosomes against cohesion fatigue.
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