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J Clin Invest. 1992 July; 90(1): 130–135.
PMCID: PMC443071

Only three mutations account for almost all defective alleles causing adenine phosphoribosyltransferase deficiency in Japanese patients.


We analyzed mutant alleles of adenine phosphoribosyltransferase (APRT) deficiency in Japanese patients. Among 141 defective APRT alleles from 72 different families, 96 (68%), 30 (21%), and 10 (7%) had an ATG to ACG missense mutation at codon 136 (APRT*J allele), TGG to TGA nonsense mutation at codon 98, and duplication of a 4-bp sequence in exon 3, respectively. The disease-causing mutations of only four (3%) of all the alleles among Japanese remain to be elucidated. Thus, a diagnosis can be made for most of the Japanese APRT-deficient patients by identifying only three disease-causing mutations. All of the different alleles with the same mutation had the same haplotype, except for APRT*J alleles, thereby suggesting that alleles with the same mutation in different families were derived from the same ancestral gene. Evidence for a crossover or gene conversion event within the APRT gene was observed in an APRT*J mutant allele. Distribution of mutant alleles encoding APRT deficiency among the Japanese was similar to that seen in cystic fibrosis genes among Caucasians and Tay-Sachs genes among the Ashkenazi Jews.

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