The Tohoku Journal of Experimental Medicine
Online ISSN : 1349-3329
Print ISSN : 0040-8727
ISSN-L : 0040-8727
Hyperglycinemia: A Defect in Glycine Cleavage Reaction
Keiya TadaKuniaki NarisawaToshio YoshidaTasuke KonnoYoshimasa YokoyamaHiroshi NakagawaKaneo TannoKeiko MochizukiTsuneo ArakawaTadashi YoshidaGoro Kikuchi
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1969 Volume 98 Issue 3 Pages 289-296


A girl with hyperglycinemia of nonketotic type was presented. The liver biopsied from the patient was studied for glycine metabolism. It was found that the yield of 14CO2 from glyeine-l-14C and the rate of 11C incorporation into serine from glyeine-l-14C as well as glycine-2-14C were extremely low in the patient's liver than in control livers, while the patient's liver showed normal activities of serine-hydroxyrnethylase and serine-dehydratase.
These findings indicate that the primary lesion of hyperglycinemia of nonketotic type is a defect in the glyeine cleavage reaction which gives rise to the formation of CO2, methylene-tetrahydrofolate and ammonia from glyeine.

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