Mitochondrial Complex Iii Deficiency, Nuclear Type 1, also known as mitochondrial complex iii deficiency nuclear type 1, is related to mitochondrial complex iii deficiency, nuclear type 2 and mitochondrial complex iii deficiency, nuclear type 6, and has symptoms including muscle spasticity, seizures and muscle weakness. An important gene associated with Mitochondrial Complex Iii Deficiency, Nuclear Type 1 is BCS1L (BCS1 Homolog, Ubiquinol-Cytochrome C Reductase Complex Chaperone), and among its related pathways/superpathways is Mitochondrial complex III assembly. Affiliated tissues include liver and skeletal muscle, and related phenotypes are hearing impairment and failure to thrive