Infant mortality is high for patients diagnosed with early onset; mortality can occur within less than 2 months, while children diagnosed with late-onset syndrome seem to have higher rates of survival. Patients suffering from a complete lesion of mut0 have not only the poorest outcome of those suffering from methylaonyl-CoA<unk>  deficiency, but also of all individuals suffering from any form of methylmalonic acidemia.
Methylmalonyl-CoA mutase deficiency
Malonyl-CoA decarboxylase deficiency
Pyruvate kinase deficiency
3-Hydroxyisobutyryl-CoA deacylase deficiency
3-Methylcrotonyl-CoA carboxylase deficiency
Ornithine aminotransferase deficiency
2-Methylbutyryl-CoA dehydrogenase deficiency
Carbamoyl phosphate synthetase I deficiency