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Identification of a novel R21X mutation in the liver-type arginase gene (ARG1) in four Portuguese patients with argininemia

✍ Scribed by M. Luís Cardoso; Esmeralda Martins; Rui Vasconcelos; Laura Vilarinho; Jorge Rocha

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
121 KB
Volume
14
Category
Article
ISSN
1059-7794

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✦ Synopsis

Argininemia is a rare autossomal recessive disorder caused by deficiency in the cytosolic liver-type arginase enzyme (L-arginine urea-hydrolase; E.C. 3.5.3.1). In order to investigate the molecular basis for argininemia in four unrelated Portuguese patients (two from northern Portugal and two from Madeira Island) we performed a DNA sequence analysis of all the exons and exon/intron boundaries of the liver-type arginase gene (ARG1). All patients were found to be homozygous for a newly identified C ->T transition in codon 21 (exon 2) substituting arginine for a premature stop codon (R21X: CGA to TGA) and generating a NlaIII restriction site. Restriction digestion following PCR amplification of ARG1 exon 2 confirmed the presence of the mutation.

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