J Korean Soc Neonatol.  2010 Nov;17(2):250-253.

A Novel Argininosuccinate Synthetase Gene Mutation in a Korean Family with Type I Citrullinemia

Affiliations
  • 1Department of Pediatrics, Daegu Fatima Hospital, Daegu, Korea. neogubugi@yahoo.co.kr
  • 2Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

Abstract

Citrullinemia type I is an urea cycle defect caused by mutations in the argininosuccinate synthetase (ASS1) gene. We report a novel argininosuccinate synthetase gene mutation in a Korean family with type I citrullinemia. Metabolic evaluation revealed significant hyperammonemia. Amino acid/acylcarnitine screening using tandem mass spectrometry showed high level of citrulline. Plasma amino acid analysis showed high level of citrulline and the urine organic acid analysis showed makedly increased level of orotic acid. To confirm diagnosis of citrullinemia we did mutation analysis of the ASS1 gene. The patient was found to have mutations of c.689G>C (p.G230A) and c.892G>A (p.E298K), which were new types of argininosuccinate synthetase gene mutation have never been reported in Korea. We report a novel case of argininosuccinate synthetase 1 gene mutation and suggest that the gene study to the family members is necessary to carry out when a patient is diagnosed as citrullinemia.

Keyword

Citrullinemia type I; Argininosuccinate synthetase (ASS1) gene; Mutation

MeSH Terms

Argininosuccinate Synthase
Citrulline
Citrullinemia
Humans
Hyperammonemia
Korea
Mass Screening
Orotic Acid
Plasma
Tandem Mass Spectrometry
Urea
Argininosuccinate Synthase
Citrulline
Orotic Acid
Urea
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