SOD2 (manganese superoxide dismutase) is a mitochondrial matrix enzyme that catalyzes the dismutation of superoxide anions into hydrogen peroxide and oxygen, protecting cells from oxidative damage 1. As a manganese-containing tetramer synthesized with a mitochondrial targeting peptide, SOD2 localizes exclusively to mitochondrial spaces where it maintains intracellular oxygen homeostasis and prevents reactive oxygen species (ROS) accumulation 1. SOD2 expression is epigenetically regulated through microRNA-mediated pathways controlling DNA methyltransferase activity, with dysregulation contributing to cellular senescence 2. Complete SOD2 deficiency impairs mitochondrial bioenergetics and complex I/II function, forcing cells toward glycolysis 3. Disease relevance is substantial: SOD2 knockout in mice causes lethal cardiomyopathy 1, while elevated SOD2 expression provides neuroprotection against cerebral ischemia-reperfusion injury 4. SOD2 dysfunction associates with cancer progression, where tumor-promoting signals reduce SOD2 activity and increase mtROS, driving malignant stemness 5. Gene polymorphisms in SOD2 influence quality of life in athletes with dental caries 6. Therapeutically, SOD2 activation through SIRT3-mediated deacetylation protects against UVB-induced photoaging 7 and hyperosmotic corneal stress 8, positioning SOD2 modulation as a promising intervention strategy across multiple pathologies.