UQCRC1 (ubiquinol-cytochrome c reductase core protein 1) is a core subunit of mitochondrial respiratory chain complex III, functioning as a component of the ubiquinol-cytochrome c oxidoreductase complex that catalyzes electron transfer from ubiquinol to cytochrome c while coupling this redox reaction to proton translocation across the inner mitochondrial membrane 1. This process is essential for generating the electrochemical gradient that drives ATP synthesis and cellular respiration. Beyond its canonical role in oxidative phosphorylation, UQCRC1 plays a critical regulatory function in neuronal apoptosis by engaging cytochrome c; UQCRC1 deficiency increases cytoplasmic cytochrome c levels and activates the caspase cascade, leading to neurodegeneration 2. UQCRC1 mutations are associated with autosomal-dominant familial parkinsonism and polyneuropathy 3, with animal models demonstrating age-dependent dopaminergic neuron loss and progressive motor decline 2. Recent structural studies reveal that UQCRC1 mutations can trigger compensatory supercomplex formation (I2+III2), which partially rescues respiratory function despite severe complex III deficiency and protects against ischemic heart failure 4. Dysregulation of UQCRC1 expression correlates with neurodegenerative disease risk 5, highlighting its importance in maintaining mitochondrial homeostasis, particularly in energy-demanding tissues such as dopaminergic neurons.