Combined Oxidative Phosphorylation Deficiency 12, also known as coxpd12, is related to mitochondrial disease and lactic acidosis, and has symptoms including ophthalmoplegia and seizures. An important gene associated with Combined Oxidative Phosphorylation Deficiency 12 is EARS2 (Glutamyl-TRNA Synthetase 2, Mitochondrial), and among its related pathways/superpathways are Metabolism of proteins and Peptide chain elongation. Affiliated tissues include thalamus and medulla oblongata, and related phenotypes are hepatomegaly and cleft palate