NDUFB6 is an accessory subunit of mitochondrial respiratory chain Complex I that plays a critical role in electron transport and cellular energy metabolism. The protein functions as part of the NADH:ubiquinone oxidoreductase complex, facilitating electron transfer from NADH to ubiquinone in the mitochondrial electron transport chain 1. Experimental evidence demonstrates that NDUFB6 is essential for Complex I activity, as its specific knockdown significantly reduces mitochondrial respiration and electron transfer capacity 1. The gene shows decreased expression in skeletal muscle of diabetic patients and is influenced by genetic, epigenetic, and age-related factors 2. A promoter polymorphism (rs629566) interacts with DNA methylation to affect NDUFB6 expression in an age-dependent manner, with implications for insulin sensitivity 2. Clinical studies reveal that NDUFB6 polymorphisms modify exercise-induced metabolic adaptations in diabetes patients 3. The gene is downregulated in various disease contexts, including myotonic dystrophy type 2, where reduced NDUFB6 expression correlates with mitochondrial dysfunction 4, and gastric cancer, where decreased expression associates with tumor invasion and metastasis 5. These findings establish NDUFB6 as a critical component of mitochondrial bioenergetics with significant implications for metabolic disorders and cancer progression.