Mitochondrial dynamics and autophagy aid in removal of persistent mitochondrial DNA damage in Caenorhabditis elegans.

Mitochondrial dynamics and autophagy aid in removal of persistent mitochondrial DNA damage in Caenorhabditis elegans.
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DOI:
10.1093/nar/gks532
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发表时间:
2012-09
影响因子:
14.9
通讯作者:
Meyer JN
Meyer JN
中科院分区:
生物学2区
文献类型:
--
作者:
Bess AS;Crocker TL;Ryde IT;Meyer JN

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线粒体缺乏修复某些螺旋扭曲损伤的能力,这些损伤是由重要的环境基因毒素和内源性代谢产物在线粒体DNA(mtDNA)中以高水平诱导的。这些病变在短期内是不可修复和持久的,但其长期命运尚不清楚。我们报告说,删除这样的mtDNA损伤是检测到的48小时在秀丽隐杆线虫,需要线粒体融合,分裂和自噬,提供了一种新的mtDNA损伤去除途径的遗传证据。此外,参与这些过程的基因突变以及自噬的药理学抑制加剧了mtDNA损伤介导的幼虫停滞,说明了去除持续mtDNA损伤的体内相关性。这些途径中的基因突变存在于人群中,表明基因毒素暴露后影响线粒体健康的重要基因-环境相互作用的潜力。
Mitochondria lack the ability to repair certain helix-distorting lesions that are induced at high levels in mitochondrial DNA (mtDNA) by important environmental genotoxins and endogenous metabolites. These lesions are irreparable and persistent in the short term, but their long-term fate is unknown. We report that removal of such mtDNA damage is detectable by 48 h in Caenorhabditis elegans, and requires mitochondrial fusion, fission and autophagy, providing genetic evidence for a novel mtDNA damage removal pathway. Furthermore, mutations in genes involved in these processes as well as pharmacological inhibition of autophagy exacerbated mtDNA damage-mediated larval arrest, illustrating the in vivo relevance of removal of persistent mtDNA damage. Mutations in genes in these pathways exist in the human population, demonstrating the potential for important gene–environment interactions affecting mitochondrial health after genotoxin exposure.
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