ATP, adénosine-5'-triphosphate; COPD, chronic obstructive pulmonary disease; COX, cytochrome c-oxidase; Cytochrome c oxidase; DMEM, Dubelcco's Modified Essential Medium; ETC, electron transport chain; Flc, fold change; GO, gene ontology; Gene expression; HES1, hairy and enhancer of split 1; HIF-1, hypoxia inducible factor-1; LRPPRC; LRPPRC, leucine-rich pentatricopeptide repeat-containing; LSFC, Leigh syndrome, French-Canadian type; Leigh syndrome; Leigh syndrome French-Canadian type (LSFC); Microarrays; Mitochondrial chain respiration; NAFLD, non-alcoholic fatty liver disease; ND6, NADH dehydrogenase, subunit 6; NDUFA4L2; NDUFA4L2, NADH dehydrogenase [ubiquinone] 1 alpha subcomplex, 4-like 2; OXPHOS, oxidative phosphorylation; PFKFB4, 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 4; PPI, protein­protein interaction; RMA, robust multi-array analysis; ROS, reactive oxygen species; RPL13A, ribosomal protein L13a; SLIRP, stem-loop interacting protein; SLSJ, Saguenay­Lac-Saint-Jean; SRA, steroid receptor RNA activator; qRT-PCR, Real-time PCR; rare diseases