Examples of diseases that may display secondary CoQ deficiencies include mitochondrial myopathies, mitochondrial DNA depletion syndrome, multiple acyl-CoA dehydrogenase deficiency (by mutations in ETFDH), ataxia-oculomotor apraxia syndrome (by mutations in APTX), cardiofaciocutaneous syndrome (by mutations in BRAF), methylmalonic aciduria, GLUT1 deficiency syndrome, mucopolysaccharidosys type III, spinocerebellar ataxia-10 (by mutations in ANO10) or multisystem atrophy (MSA) [102,103,104,105,106]. Here, APTX is linked to multiple system atrophy.