Molecular Basis of Argininemia

Abstract

Argininemia results from a deficiency of arginase (EC 3.5.3.1), the last enzyme of the urea cycle in the liver. We examined the molecular basis for argininemia by constructing a genomic library followed by cloning and DNA sequencing. Discrete mutations were found on two alleles from the patient, a product of a nonconsanguineous marriage. There was a four-base deletion at protein-coding region 262-265 or 263-266 in exon 3 that would lead to a reading-frame shift after amino acid residue 87 and make a new stop codon at residue 132. The other was a one-base deletion at 77 or 78 in exon 2 that would lead to a reading-frame shift after residue 26 and make a stop codon at residue 31. For confirmation, genomic DNAs from the patient and from her parents were amplified by the polymerase chain reaction method. The patient was shown to be a compound heterozygote, inheriting an allele with the four-base deletion from the father and the other allele with the one-base deletion from the mother. These data seem to be the first evidence of a case of argininemia caused by two different deletion mutations. (J. CliU. Invest. 1990. 86:347-350.)

4 Figures and Tables

Cite this paper

@inproceedings{Aparicio2013MolecularBO, title={Molecular Basis of Argininemia}, author={Juan Manuel Aparicio and Masaki Taklguchi and Izumi Akaboshi and Makoto Yoshino and s Masataka and Ichiro Matsuda}, year={2013} }