Replication fork rescue in mammalian mitochondria

Replication fork rescue in mammalian mitochondria
复制标题

哺乳动物线粒体中的复制叉救援

DOI:
10.1038/s41598-019-45244-6
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发表时间:
2019
期刊:
影响因子:
4.6
通讯作者:
Pohjoismäki JLO
Pohjoismäki JLO
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Torregrosa-Muñumer R;Hangas A;Goffart S;Blei D;Zsurka G;Griffith J;Kunz WS;Pohjoismäki JLO

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复制停滞与病理性线粒体DNA(MtDNA)重排的形成有关。然而,几乎对线粒体中停滞不前的复制中间产物的命运一无所知。我们在这里表明,线粒体复制停滞会导致复制分叉倒退和mtDNA双链断裂。产生的mtDNA片段通常通过涉及线粒体外切酶MGME1的机制降解,该酶的丢失会导致线形和重组mtDNA物种的积累。此外,复制应激促进替代复制起始点的启动,作为分叉收敛的一种明显的拯救手段。除了证明两种拯救停滞复制分叉的主要机制-线粒体DNA降解和同源依赖修复-之间的相互作用外,我们的数据还提供了证据,表明线粒体使用类似的机制来应对其他遗传系统中已知的复制应激。
Replication stalling has been associated with the formation of pathological mitochondrial DNA (mtDNA) rearrangements. Yet, almost nothing is known about the fate of stalled replication intermediates in mitochondria. We show here that replication stalling in mitochondria leads to replication fork regression and mtDNA double-strand breaks. The resulting mtDNA fragments are normally degraded by a mechanism involving the mitochondrial exonuclease MGME1, and the loss of this enzyme results in accumulation of linear and recombining mtDNA species. Additionally, replication stress promotes the initiation of alternative replication origins as an apparent means of rescue by fork convergence. Besides demonstrating an interplay between two major mechanisms rescuing stalled replication forks – mtDNA degradation and homology-dependent repair – our data provide evidence that mitochondria employ similar mechanisms to cope with replication stress as known from other genetic systems.
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