COQ10A is a lipid-binding START domain protein localized to the mitochondrial inner membrane that plays a critical role in coenzyme Q (CoQ) function within the respiratory electron transport chain 1. As a putative chaperone, COQ10A likely facilitates the delivery of CoQ to its catalytic sites in respiratory complexes, enabling efficient cellular energy metabolism and antioxidant protection against lipid peroxidation 1. The protein is functionally conserved across organisms, as human COQ10A rescues respiratory deficiency and oxidative stress sensitivity in yeast coq10 deletion mutants 1. COQ10A dysfunction is implicated in multiple pathological conditions: reduced plasma COQ10A concentrations correlate with mitochondrial dysfunction in myasthenia gravis patients 2, and COQ10A dysregulation appears associated with heart development abnormalities in Turner syndrome cardiomyocytes 3. Additionally, COQ10A has been identified as a hub gene in sepsis-induced cardiomyopathy, where altered expression contributes to cardiac dysfunction through impaired bioenergy metabolism 45. COQ10A variants are also proposed as genetic predisposing factors in statin-associated myopathy 6, suggesting its importance in muscle energy metabolism. These findings establish COQ10A as essential for mitochondrial respiration and indicate its potential as a biomarker for mitochondrial dysfunction-related diseases.