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Histone H3K79 methylation by DOT1L promotes Aurora B localization at centromeres in mitosis
Cell Reports ( IF 7.5 ) Pub Date : 2023-07-25 , DOI: 10.1016/j.celrep.2023.112885
Dan Yang 1 , Yanji He 1 , Renyan Li 2 , Zhenting Huang 3 , Yong Zhou 1 , Yingxu Shi 1 , Zhongliang Deng 1 , Jingxian Wu 3 , Yanfei Gao 3
Affiliation  

Centromere localization of the chromosome passenger complex (CPC) is paramount for achieving accurate sister chromosome segregation in mitosis. Although it has been widely recognized that the recruitment of CPC is directly regulated by two histone codes, phosphorylation of histone H3 at threonine 3 (H3T3ph) and phosphorylation of histone H2A at threonine 120 (H2AT120ph), the regulation of CPC localization by other histone codes remains elusive. We show that dysfunction of disruptor of telomeric silencing 1 like (DOT1L) leads to mislocation of the CPC in prometaphase, caused by disturbing the level of H3T3ph and its reader Survivin. This cascade is initiated by over-dephosphorylation of H3T3ph mediated by the phosphatase RepoMan-PP1, whose scaffold RepoMan translocalizes to chromosomes, while the level of H3K79me2/3 is diminished. Together, our findings uncover a biological function of DOT1L and H3K79 methylation in mitosis and give insight into how genomic stability is coordinated by different histone codes.

中文翻译:


DOT1L 的组蛋白 H3K79 甲基化促进 Aurora B 在有丝分裂中着丝粒的定位



染色体过客复合体 (CPC) 的着丝粒定位对于在有丝分裂中实现精确的姐妹染色体分离至关重要。尽管人们普遍认为 CPC 的募集直接受两个组蛋白密码的调节,即组蛋白 H3 在苏氨酸 3 处的磷酸化 (H3T3ph) 和组蛋白 H2A 在苏氨酸 120 处的磷酸化 (H2AT120ph),但 CPC 定位的调节还受到其他组蛋白密码的调节仍然难以捉摸。我们发现,端粒沉默破坏子 1 样 (DOT1L) 的功能障碍会导致中期 CPC 错位,这是由扰乱 H3T3ph 及其读取器生存素的水平引起的。该级联反应是由磷酸酶 RepoMan-PP1 介导的 H3T3ph 过度去磷酸化启动的,其支架 RepoMan 易位至染色体,同时 H3K79me2/3 的水平降低。总之,我们的研究结果揭示了 DOT1L 和 H3K79 甲基化在有丝分裂中的生物学功能,并深入了解不同组蛋白密码如何协调基因组稳定性。
更新日期:2023-07-25
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