Mitochondrial Complex Iv Deficiency, Nuclear Type 12, also known as mc4dn12, is related to mitochondrial complex iv deficiency, nuclear type 1 and leigh syndrome. An important gene associated with Mitochondrial Complex Iv Deficiency, Nuclear Type 12 is PET100 (PET100 Cytochrome C Oxidase Chaperone). Affiliated tissues include brain, and related phenotypes are aminoaciduria and hypoglycemia