Mitochondrial Complex I Deficiency, Nuclear Type 6, is also known as mc1dn6. An important gene associated with Mitochondrial Complex I Deficiency, Nuclear Type 6 is NDUFS2 (NADH:Ubiquinone Oxidoreductase Core Subunit S2). Affiliated tissues include liver and skeletal muscle, and related phenotypes are decreased activity of mitochondrial complex i and lactic acidosis