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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Mitochondrial DNA Heteroplasmy Associations With Neurosensory and Mobility Function in Elderly Adults
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Mitochondrial DNA Heteroplasmy Associations With Neurosensory and Mobility Function in Elderly Adults

机译:线粒体DNA异质性与老年人的神经感觉和活动功能。

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Background. Mitochondrial DNA ( mtDNA) heteroplasmy is a mixture of normal and mutated mtDNA molecules in a cell. High levels of heteroplasmy at specific mtDNA sites lead to inherited mitochondrial diseases with neurological, sensory, and movement impairments. Here we test the hypothesis that heteroplasmy levels in elderly adults are associated with impaired function resembling mild forms of mitochondrial disease. Methods. We examined platelet mtDNA heteroplasmy at 20 disease-causing sites for associations with neurosensory and mobility function among 137 participants from the community-based Health, Aging, and Body Composition Study. Results. Elevated mtDNA heteroplasmy at four mtDNA sites in complex I and tRNA genes was nominally associated with reduced cognition, vision, hearing, and mobility: m. 10158T> C with Modified Mini-Mental State Examination score ( p =.009); m. 11778G> A with contrast sensitivity ( p =.02); m. 7445A> G with high-frequency hearing ( p =.047); and m. 5703G> A with 400 m walking speed ( p =.007). Conclusions. These results indicate that increased mtDNA heteroplasmy at disease-causing sites is associated with neurosensory and mobility function in older persons. We propose the novel use of mtDNA heteroplasmy as a simple, noninvasive predictor of age-related neurologic, sensory, and movement impairments.
机译:背景。线粒体DNA(mtDNA)异质性是细胞中正常和突变的mtDNA分子的混合物。特定mtDNA位点的高水平异质性导致具有神经,感觉和运动障碍的遗传线粒体疾病。在这里,我们测试的假设是,老年人中的异质性水平与功能受损有关,类似于轻度形式的线粒体疾病。方法。我们在基于社区的健康,衰老和身体成分研究的137名参与者中,检查了20个致病部位的血小板mtDNA异质性与神经感觉和活动功能的关系。结果。复杂的I和tRNA基因中四个mtDNA位点的mtDNA异质性升高与认知,视力,听力和活动能力的降低相关。 10158T> C,并具有修改后的迷你精神状态检查评分(p = .009);米11778G>具有对比敏感度的A(p = .02);米7445A> G有高频听力(p = .047);和米5703G> A,步行速度为400 m(p = .007)。结论。这些结果表明,致病位点的mtDNA异质性增加与老年人的神经感觉和活动功能有关。我们建议将mtDNA异质性作为一种与年龄相关的神经,感觉和运动障碍的简单,非侵入性预测因子进行新颖的使用。

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