CHCHD 10 mutations promote loss of mitochondrial cristae junctions with impaired mitochondrial genome maintenance and inhibition of apoptosis

CHCHD10‐related diseases include mitochondrial DNA instability disorder, frontotemporal dementia‐amyotrophic lateral sclerosis (FTD‐ALS) clinical spectrum, late‐onset spinal motor neuropathy (SMAJ), and Charcot–Marie–Tooth disease type 2 (CMT2). Here, we show that CHCHD10 resides with mitofilin, CHC...

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Bibliographic Details
Published in:EMBO molecular medicine 2016-01, Vol.8 (1), p.58-72
Main Authors: Genin, Emmanuelle C, Plutino, Morgane, Bannwarth, Sylvie, Villa, Elodie, Cisneros‐Barroso, Eugenia, Roy, Madhuparna, Ortega‐Vila, Bernardo, Fragaki, Konstantina, Lespinasse, Françoise, Pinero‐Martos, Estefania, Augé, Gaëlle, Moore, David, Burté, Florence, Lacas‐Gervais, Sandra, Kageyama, Yusuke, Itoh, Kie, Yu‐Wai‐Man, Patrick, Sesaki, Hiromi, Ricci, Jean‐Ehrland, Vives‐Bauza, Cristofol, Paquis‐Flucklinger, Véronique
Format: Article
Language:English
Subjects:
Amyotrophic lateral sclerosis
Apoptosis
Charcot-Marie-Tooth disease
Cristae
Cytochrome
Cytochrome c
Dementia
Dementia disorders
Experiments
Fibroblasts
Frontotemporal dementia
Genes
Genomes
Genomic instability
Lysosomes
Mitochondria
Mitochondrial DNA
Motor neurone disease
Mutation
Neuropathy
Oxidative stress
Pathogenesis
Patients
Proteins
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Summary:CHCHD10‐related diseases include mitochondrial DNA instability disorder, frontotemporal dementia‐amyotrophic lateral sclerosis (FTD‐ALS) clinical spectrum, late‐onset spinal motor neuropathy (SMAJ), and Charcot–Marie–Tooth disease type 2 (CMT2). Here, we show that CHCHD10 resides with mitofilin, CHCHD3 and CHCHD6 within the “mitochondrial contact site and cristae organizing system” (MICOS) complex. CHCHD10 mutations lead to MICOS complex disassembly and loss of mitochondrial cristae with a decrease in nucleoid number and nucleoid disorganization. Repair of the mitochondrial genome after oxidative stress is impaired in CHCHD10 mutant fibroblasts and this likely explains the accumulation of deleted mtDNA molecules in patient muscle. CHCHD10 mutant fibroblasts are not defective in the delivery of mitochondria to lysosomes suggesting that impaired mitophagy does not contribute to mtDNA instability. Interestingly, the expression of CHCHD10 mutant alleles inhibits apoptosis by preventing cytochrome c release.
ISSN:1757-4676
1757-4684
DOI:10.15252/emmm.201505496