Charcot-Marie-Tooth Disease, Type 4k, also known as charcot-marie-tooth disease type 4k, is related to mitochondrial complex v deficiency, mitochondrial type 1 and isolated complex iii deficiency. An important gene associated with Charcot-Marie-Tooth Disease, Type 4k is SURF1 (SURF1 Cytochrome C Oxidase Assembly Factor), and among its related pathways/superpathways are Metabolism and Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins.. Affiliated tissues include brain and skeletal muscle, and related phenotypes are ataxia and hearing impairment