异质性
线粒体DNA
生物
人类线粒体遗传学
粒线体疾病
遗传学
线粒体呼吸链
线粒体
分子生物学
基因
作者
Atsuko Imai‐Okazaki,Kazuhiro R. Nitta,Yukiko Yatsuka,Ayumu Sugiura,Masato Arao,Masaru Shimura,Tomohiro Ebihara,Takanori Onuki,Keiko Ichimoto,Akira Ohtake,Kei Murayama,Yasushi Okazaki
摘要
Abstract Pathogenic mitochondrial DNA heteroplasmy has mainly been assessed with bulk sequencing in individuals with mitochondrial disease. However, the distribution of heteroplasmy at the single‐cell level in skin fibroblasts obtained from individuals, together with detailed clinical and biochemical information, remains to be investigated. We used the mitochondrial DNA single‐cell assay for the transposase‐accessible chromatin sequencing method. Skin fibroblasts were obtained from six individuals with mitochondrial disease and pathogenic m.3243A>G variants of differing severity. Different distributions of heteroplasmy at the single‐cell level were identified in skin fibroblasts from all six individuals. Four individuals with different outcomes showed similar averaged heteroplasmy rates with normal mitochondrial respiratory chain enzyme activity, while the distribution of single‐cell heteroplasmy patterns differed among the individuals. This study showed different heteroplasmy distribution patterns at the single‐cell level in individuals with the m.3243A>G variant, who had a similar averaged heteroplasmy rates with normal mitochondrial respiratory chain enzyme activity. Whether such different heteroplasmy distribution patterns explain the different clinical outcomes should be assessed further in future studies. Measuring heteroplasmy of pathogenic mitochondrial DNA variants at the single‐cell level could be important in individuals with mitochondrial disease.
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