English (United Kingdom)

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https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

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The mitochondrial DNA m.3243A > G mutation is well-known to cause a variety of clinical phenotypes, including diabetes, deafness, and osteoporosis. Here, we report isolation and expansion of urine-derived stem cells (USCs) from patients carrying the m.3243A > G mutation, which demonstrate bimodal heteroplasmy. USCs with high levels of m.3243A > G mutation displayed abnormal mitochondrial morphology and function, as well as elevated ATF5-dependent mitochondrial unfolded protein response (UPR mt ), together with reduced Wnt/β-catenin signaling and osteogenic potentials. Knockdown of ATF5 in mutant USCs suppressed UPR mt , improved mitochondrial function, restored expression of  GSK3B  and  WNT7B , and rescued osteogenic potentials. These results suggest that ATF5-dependent UPR mt  could be a core disease mechanism underlying mitochondrial dysfunction and osteoporosis related to the m.3243A > G mutation, and therefore could be a novel putative therapeutic target for this genetic disorder.

ATF5, a putative therapeutic target for the mitochondrial DNA 3243A > G mutation-related disease