NDUFS8 encodes the NADH:ubiquinone oxidoreductase core subunit S8 (also called TYKY), a critical iron-sulfur protein component of mitochondrial complex I. This subunit is part of the hydrophilic arm of complex I and participates directly in electron transfer.
NDUFS8 contains:
- Two [4Fe-4S] clusters for electron transfer
- NADH binding domain
- Ubiquinone reduction site
NDUFS8 mutations are a known cause of Leigh syndrome:
- Early infantile onset (typically <2 years)
- Progressive encephalopathy with characteristic MRI findings
- Metabolic crisis triggered by illness
- Poor prognosis — often fatal in childhood
NDUFS8 variants cause isolated complex I deficiency:
- Reduced enzyme activity (typically 10-30% of normal)
- Variable phenotype from severe multisystem disease to mild encephalopathy
NDUFS6 is expressed in all tissues with high metabolic demands:
- Brain: All regions, especially neurons
- Heart: Highest expression
- Skeletal muscle
- Liver and kidney
- Petruzzella et al., NDUFS8 mutations (2002)
- Brandt et al., Complex I structure and function (2006)
- Loeffen et al., NDUFS8 mutations cause complex I deficiency (2001)
- Papa et al., Mitochondrial complex I deficiency in neurodegeneration (2012)
- Keeney et al., Complex I subunit mutations in mitochondrial disease (2006)
- Wiedemann et al., Mitochondrial complex I assembly in health and disease (2006)
- Perier & Vila, Complex I deficiency and mitochondrial dysfunction in PD (2012)
- Johri & Beal, Mitochondrial therapeutics in neurodegenerative disease (2012)
- Schapira, Mitochondrial complex I deficiency in Parkinson's disease (2012)
- Kruse et al., Human NDUFS8 mutations and Leigh syndrome (2008)