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Abstract:

© Springer- Verlag Berlin Heidelberg 2000, 2006, 2012. Four disorders of proline metabolism are known: two in its catabolism (hyperprolinaemia type I, which is due to proline oxidase deficiency, and hyperprolinaemia type II, which is due to ∆-pyrroline 5-carboxylate dehydrogenase deficiency) and two in its synthesis (∆1-pyrroline 5-carboxylate synthase deficiency and ∆-pyrroline 5-carboxylate reductase deficiency). Hyperprolinaemia type I is generally considered a nondisease, while hyperprolinaemia type II appears to be associated with a disposition to recurrent seizures. The deficiency of the proline-synthesising enzyme, ∆-pyrroline 5-carboxylate synthase, which is also involved in ornithine synthesis, is described in Chapter 22.