A mitosis-specific and R loop-driven ATR pathway promotes faithful chromosome segregation.

A mitosis-specific and R loop-driven ATR pathway promotes faithful chromosome segregation.
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DOI:
10.1126/science.aan6490
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发表时间:
2018-01-05
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Zou L
Zou L
中科院分区:
其他
文献类型:
--
作者:
Kabeche L;Nguyen HD;Buisson R;Zou L

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ATR激酶对DNA损伤和复制应激反应至关重要。在这里,我们描述了一个令人惊讶的作用ATR在有丝分裂。有丝分裂中ATR的急性抑制或降解诱导整个染色体的错误分离。ATR消融的效果不是由于CDK 1活性改变、DNA损伤反应或非程序性DNA合成,而是由于着丝粒处ATR功能的丧失。在有丝分裂中,ATR通过Aurora A调节的与CENP-F的结合定位于着丝粒,允许ATR接合RPA包被的着丝粒R环。由于ATR在着丝粒被激活,它通过Chk 1刺激Aurora B,阻止落后染色体的形成。因此,有丝分裂特异性和R环驱动的ATR途径在着丝粒处起作用以促进忠实的染色体分离,揭示了R环和ATR在抑制染色体不稳定性中的功能。
The ATR kinase is crucial for DNA damage and replication stress responses. Here we describe a surprising role of ATR in mitosis. Acute inhibition or degradation of ATR in mitosis induces whole-chromosome missegregation. The effect of ATR ablation is not due to altered CDK1 activity, DNA damage responses, or unscheduled DNA synthesis, but to loss of an ATR function at centromeres. In mitosis ATR localizes to centromeres through Aurora A-regulated association with CENP-F, allowing ATR to engage RPA-coated centromeric R loops. As ATR is activated at centromeres, it stimulates Aurora B through Chk1, preventing formation of lagging chromosomes. Thus, a mitosis-specific and R loop-driven ATR pathway acts at centromeres to promote faithful chromosome segregation, revealing functions of R loops and ATR in suppressing chromosome instability.
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