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Modeling Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-Like Episodes Syndrome Using Patient-Derived Induced Neurons Generated by Direct Reprogramming.
Cellular Reprogramming 2022 July 9
Mitochondrial diseases are a heterogeneous group of rare genetic disorders caused by mutations in nuclear or mitochondrial DNA (mtDNA). These diseases are frequently multisystemic, although mainly affect tissues that require large amounts of energy such as the brain. Mutations in mitochondrial transfer RNA (mt-tRNA) lead to defects in protein translation that may compromise some or all mtDNA-encoded proteins. Mitochondrial Encephalomyopathy, Lactic Acidosis and Stroke-like episodes (MELAS) syndrome is mainly caused by the m.3243A>G mutation in the mt-tRNALeu(UUR) ( MT-TL1 ) gene. Owing to the lack of proper animal models, several cellular models have been developed to study the disease, providing insight in the pathophysiological mechanisms of MELAS. In this study, we show a successful direct conversion of MELAS patient-derived fibroblasts into induced neurons (iNs) for the first time, as well as an electrophysiological characterization of iNs cocultured with astrocytes. In addition, we performed bioenergetics analysis to study the consequences of m.3243A>G mutation in this neuronal model of MELAS syndrome.
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