NDUFS4 (NADH:Ubiquinone Oxidoreductase Subunit S4) is a Protein Coding gene. Diseases associated with NDUFS4 include Leigh Syndrome and Mitochondrial Complex I Deficiency. Among its related pathways are Metabolism and Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins. NDUFS4 encodes an nuclear-encoded accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (complex I, or NADH:ubiquinone oxidoreductase). Complex I removes electrons from NADH and passes them to the electron acceptor ubiquinone.