Bjornstad Syndrome, also known as pili torti-deafness syndrome, is related to mitochondrial complex iii deficiency, nuclear type 1 and gracile syndrome. An important gene associated with Bjornstad Syndrome is BCS1L (BCS1 Homolog, Ubiquinol-Cytochrome C Reductase Complex Chaperone), and among its related pathways/superpathways is Mitochondrial complex III assembly. Affiliated tissues include skin and skeletal muscle, and related phenotypes are sensorineural hearing impairment and alopecia