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Deposition Bias of Chromatin Proteins Inverts under DNA Replication Stress Conditions
ACS Chemical Biology ( IF 3.5 ) Pub Date : 2021-09-30 , DOI: 10.1021/acschembio.1c00321
Martijn R H Zwinderman 1 , Thamar Jessurun Lobo 2 , Petra E van der Wouden 1 , Diana C J Spierings 2 , Marcel A T M van Vugt 3 , Peter M Lansdorp 2, 4, 5 , Victor Guryev 2 , Frank J Dekker 1
Affiliation  

Following DNA replication, equal amounts of chromatin proteins are distributed over sister chromatids by re-deposition of parental chromatin proteins and deposition of newly synthesized chromatin proteins. Molecular mechanisms balancing the allocation of new and old chromatin proteins remain largely unknown. Here, we studied the genome-wide distribution of new chromatin proteins relative to parental DNA template strands and replication initiation zones using the double-click-seq. Under control conditions, new chromatin proteins were preferentially found on DNA replicated by the lagging strand machinery. Strikingly, replication stress induced by hydroxyurea or curaxin treatment and inhibition of ataxia telangiectasia and Rad3-related protein (ATR) or p53 inactivation inverted the observed chromatin protein deposition bias to the strand replicated by the leading strand polymerase in line with previously reported effects on replication protein A occupancy. We propose that asymmetric deposition of newly synthesized chromatin proteins onto sister chromatids reflects differences in the processivity of leading and lagging strand synthesis.

中文翻译:

DNA复制应激条件下染色质蛋白的沉积偏差反转

在 DNA 复制后,等量的染色质蛋白通过亲本染色质蛋白的重新沉积和新合成的染色质蛋白的沉积分布在姐妹染色单体上。平衡新旧染色质蛋白分配的分子机制在很大程度上仍然未知。在这里,我们使用双击序列研究了新染色质蛋白相对于亲本 DNA 模板链和复制起始区的全基因组分布。在控制条件下,新的染色质蛋白优先在由滞后链机器复制的 DNA 上发现。引人注目的是,由羟基脲或 curaxin 处理诱导的复制应激和抑制共济失调毛细血管扩张和 Rad3 相关蛋白 (ATR) 或 p53 失活将观察到的染色质蛋白沉积偏向反转到由前导链聚合酶复制的链,与先前报道的对复制蛋白 A 的影响一致占用。我们提出新合成的染色质蛋白在姐妹染色单体上的不对称沉积反映了前导链和滞后链合成的持续合成能力的差异。
更新日期:2021-11-19
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