Mitochondrial Complex I Deficiency, Nuclear Type 34, also known as mc1dn34, is related to mitochondrial disease. An important gene associated with Mitochondrial Complex I Deficiency, Nuclear Type 34 is NDUFAF8 (NADH:Ubiquinone Oxidoreductase Complex Assembly Factor 8). Affiliated tissues include liver and thalamus, and related phenotypes are lactic acidosis and intrauterine growth retardation