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Free keywords:
Animals
Ataxia/*pathology
*Gene Expression Profiling
*Metabolome
Mice, Knockout
Mitochondria/*chemistry
Mitochondrial Diseases/*pathology
Muscle Weakness/*pathology
Proteome/*analysis
Ubiquinone/*deficiency
*Cellular transcriptome
*Coenzyme Q biosynthesis
*Mitochondrial gene expression
*Mitoproteome
*OXPHOS dysfunction
*One-carbon pathway
*biochemistry
*cell biology
*mouse
Abstract:
Dysfunction of the oxidative phosphorylation (OXPHOS) system is a major cause of human disease and the cellular consequences are highly complex. Here, we present comparative analyses of mitochondrial proteomes, cellular transcriptomes and targeted metabolomics of five knockout mouse strains deficient in essential factors required for mitochondrial DNA gene expression, leading to OXPHOS dysfunction. Moreover, we describe sequential protein changes during post-natal development and progressive OXPHOS dysfunction in time course analyses in control mice and a middle lifespan knockout, respectively. Very unexpectedly, we identify a new response pathway to OXPHOS dysfunction in which the intra-mitochondrial synthesis of coenzyme Q (ubiquinone, Q) and Q levels are profoundly decreased, pointing towards novel possibilities for therapy. Our extensive omics analyses provide a high-quality resource of altered gene expression patterns under severe OXPHOS deficiency comparing several mouse models, that will deepen our understanding, open avenues for research and provide an important reference for diagnosis and treatment.
