描述
Propionic acidemia (Ketotic hyperglycinemia) is caused by mutation in the genes encoding propionyl-CoA carboxylase, PCCA or PCCB. The break down of Propionyl-CoA is catalyzed by Propionyl-CoA carboxylase (PCC). Propionyl-CoA plays an important role in amino acid metabolism. A mutation in this enzyme causes accumulation of ammonia and propionylcarnitine (C3) in the blood; carnitine , glutamine, glycine, and propionic acid in the plasma; 3-hydroxypropionic acid, 3-hydroxyvaleric acid, 5-oxoproline, acylcarnitin, glycine, methylcitric acid, propionylglycine and tiglylcine in the urine. Symptoms include cardio myopathy, growth retardation, hypothermia, ketosis, neutropenia, strokelike episodes, pyloric stenosis and spastic diplegia/quadriplegia.