PrimPol is required for the maintenance of efficient nuclear and mitochondrial DNA replication in human cells

PrimPol is required for the maintenance of efficient nuclear and mitochondrial DNA replication in human cells
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PrimPol 是维持人类细胞中有效的核和线粒体 DNA 复制所必需的

DOI:
10.1101/501304
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Bailey L
Bailey L
中科院分区:
--
文献类型:
--
作者:
Bailey L

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真核引物聚合酶(PrimPol)是通过在复制酶停滞损伤和结构的下游再引发复制重启来维持有效DNA复制的酶。为了阐明PrimPol在人类细胞中的细胞需求,我们产生了PrimPol缺失的细胞系,并表明即使在没有外源性损伤的情况下,它在维持细胞核和细胞核中的活跃复制中也起着关键作用。缺乏PrimPol的人类细胞在UV-C损伤后表现出延迟的恢复,并增加突变频率,微核和姐妹染色质交换,但对遗传毒素不敏感。PrimPol在线粒体复制过程中也是必需的,PrimPol缺陷细胞具有增加的mtDNA拷贝数,但复制显着减少。XPV细胞中PrimPol的缺失,缺乏功能性聚合酶Eta,导致UV-C处理后DNA损伤敏感性增加和明显的叉停滞。我们发现,与典型的TLS聚合酶不同,PrimPol对于允许主动复制进行是重要的,即使在没有外源性损伤的情况下,也是如此,从而防止了过度的分叉停滞和基因突变的积累。总之,这些发现强调了PrimPol对于在未受干扰的细胞中维持高效DNA复制的重要性,以及其与Pol Eta在人类细胞损伤耐受性中的互补作用。
Eukaryotic Primase-Polymerase (PrimPol) is an enzyme that maintains efficient DNA duplication by repriming replication restart downstream of replicase stalling lesions and structures. To elucidate the cellular requirements for PrimPol in human cells, we generated PrimPol-deleted cell lines and show that it plays key roles in maintaining active replication in both the nucleus and mitochondrion, even in the absence of exogenous damage. Human cells lacking PrimPol exhibit delayed recovery after UV-C damage and increased mutation frequency, micronuclei and sister chromatin exchanges but are not sensitive to genotoxins. PrimPol is also required during mitochondrial replication, with PrimPol-deficient cells having increased mtDNA copy number but displaying a significant decrease in replication. Deletion of PrimPol in XPV cells, lacking functional polymerase Eta, causes an increase in DNA damage sensitivity and pronounced fork stalling after UV-C treatment. We show that, unlike canonical TLS polymerases, PrimPol is important for allowing active replication to proceed, even in the absence of exogenous damage, thus preventing the accumulation of excessive fork stalling and genetic mutations. Together, these findings highlight the importance of PrimPol for maintaining efficient DNA replication in unperturbed cells and its complementary roles, with Pol Eta, in damage tolerance in human cells.
DOI: 10.1016/j.bbadis.2015.05.016
发表时间: 2015-09
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影响因子: --
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DOI: 10.6084/m9.figshare.1627932
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发表时间: 2017
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