Mitochondrial Complex I Deficiency, Nuclear Type 1, also known as mitochondrial complex i deficiency, is related to mitochondrial complex i deficiency, nuclear type 10 and mitochondrial complex i deficiency, nuclear type 28, and has symptoms including ataxia, lethargy and muscle spasticity. An important gene associated with Mitochondrial Complex I Deficiency, Nuclear Type 1 is NDUFS4 (NADH:Ubiquinone Oxidoreductase Subunit S4), and among its related pathways/superpathways are Metabolism and Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins.. The drug Pharmaceutical Solutions has been mentioned in the context of this disorder. Affiliated tissues include liver and brain, and related phenotypes are failure to thrive and hypotonia