Molecular Biology/Biochemistry Characterization of four variant forms of human propionyl-CoA carboxylase expressed in Escherichia coli. Towards a model to explain the intragenic complementation in the heteromultimeric protein propionyl-CoA carboxylase. Functional analysis of PCCB mutations causing propionic acidemia based on expression studies in deficient human skin fibroblasts. Potential relationship between genotype and clinical outcome in propionic acidaemia patients. Acidemia propiónica: identification of twenty-four novel mutations in Europe and North America. High Incidence of Propionic Acidemia in Greenland Is Due to a Prevalent Mutation, 1540insCCC, in the Gene for the β-Subunit of Propionyl CoA Carboxylase