Phosphorylated SIRT1 associates with replication origins to prevent excess replication initiation and preserve genomic stability.
Phosphorylated SIRT1 associates with replication origins to prevent excess replication initiation and preserve genomic stability.
复制标题
磷酸化的SIRT1与复制起源相关,以防止复制过多并保留基因组稳定性。
DOI:
10.1093/nar/gkx468
复制
发表时间:
2017-07-27
影响因子:
14.9
通讯作者:
Aladjem MI
中科院分区:
文献类型:
--
作者:
Utani K;Fu H;Jang SM;Marks AB;Smith OK;Zhang Y;Redon CE;Shimizu N;Aladjem MI
Chromatin structure affects DNA replication patterns, but the role of specific chromatin modifiers in regulating the replication process is yet unclear. We report that phosphorylation of the human SIRT1 deacetylase on Threonine 530 (T530-pSIRT1) modulates DNA synthesis. T530-pSIRT1 associates with replication origins and inhibits replication from a group of ‘dormant’ potential replication origins, which initiate replication only when cells are subject to replication stress. Although both active and dormant origins bind T530-pSIRT1, active origins are distinguished from dormant origins by their unique association with an open chromatin mark, histone H3 methylated on lysine 4. SIRT1 phosphorylation also facilitates replication fork elongation. SIRT1 T530 phosphorylation is essential to prevent DNA breakage upon replication stress and cells harboring SIRT1 that cannot be phosphorylated exhibit a high prevalence of extrachromosomal elements, hallmarks of perturbed replication. These observations suggest that SIRT1 phosphorylation modulates the distribution of replication initiation events to insure genomic stability.
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