Mitochondrial DNA Repair Processes In Oxidative Stress And Aging

线粒体功能障碍被认为是衰老和年龄相关性退化的重要促成因素。我们和其他人正在研究核DNA损伤和线粒体功能障碍之间的关系。像核隔室一样，线粒体有自己的DNA修复和应激反应系统。 此前，我们报道了一个意想不到的发现，即DNA聚合酶β（PolB）存在于线粒体中，并可能有助于该隔室中的DNA修复。在进一步的研究中，我们比较了PolB和聚合酶γ（PolG），线粒体DNA的复制聚合酶，DNA修复底物和中间体。我们报告说，DNA PolB是更精通单核苷酸缺口填充和提取物缺乏PolB是严重缺乏处理BER中间体。展望未来，我们正在研究DNA修复缺陷如何改变核-线粒体信号传导，并正在研究线粒体功能障碍。

Mitochondrial dysfunction is recognized as an important contributing factor for aging and age-related degeneration. We and others are investigating the relationship between nuclear DNA damage and mitochondrial dysfunction. Like the nuclear compartment, mitochondria have their own DNA repair and stress response systems. Previously, we reported the unexpected finding that DNA polymerase Beta (PolB) was present in mitochondria and could contribute to DNA repair in that compartment. Upon further investigation, we compared PolB and Polymerase Gamma (PolG), the replicative polymerase for mitochondrial DNA, on DNA repair substrates and intermediates. We reported that DNA PolB was more proficient at single-nucleotide gap filling and extracts lacking PolB are severely deficient in processing BER intermediates. Moving forward, we are investigating how DNA repair deficiencies contributes to altered nucleus-to-mitochondria signaling and mitochondrial dysfunction is being studied.