Non-ketotic hyperglycinemia: a life-threatening disorder in the neonate

K. Tada, S. Kure, M. Takayanagi, A. Kume, K. Narisawa

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Non-ketotic hyperglycinemia (NKH) is a well-recognized metabolic cause of life-threatening illness in the neonate. The fundamental defect is in the glycine cleavage enzyme (GCE), which consists of four protein components. Our study revealed that the majority of NKH patients had a specific defect in P-protein (glycine decarboxylase). The primary lesion of NKH in gene level was investigated, using cDNA encoding human glycine decarboxylase. A three-base deletion; resulting in deletion of Phe756 was found in a Japanese patient with NKH. In the majority of NKH patients in Finland, where there is a high incidence of NKH, it was found to be due to a common mutation - a point mutation resulting in amino acid alternation from Ser564 to Ile564. Prenatal diagnosis is possible by determining the activity of GCE and also by DNA analysis. Recent findings suggest that the high concentrations of glycine in the brain may contribute to the'pathophysiology of NKH by overactivating NMDA receptors via an action at the associated glycine modulatory site. These provide a possibility that early treatment with NMDA receptor antagonist may prevent brain damage in NKH.

Original languageEnglish
Pages (from-to)75-81
Number of pages7
JournalEarly Human Development
Volume29
Issue number1-3
DOIs
Publication statusPublished - 1992

Keywords

  • glycine cleavage enzyme
  • non-ketotic hyperglycinernia
  • prenatal diagnosis

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Obstetrics and Gynaecology

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