Combined Oxidative Phosphorylation Deficiency 27, is also known as combined oxidative phosphorylation defect type 27. An important gene associated with Combined Oxidative Phosphorylation Deficiency 27 is CARS2 (Cysteinyl-TRNA Synthetase 2, Mitochondrial). Affiliated tissues include skeletal muscle and liver, and related phenotypes are intellectual disability and developmental regression