Crossovers within a short DNA sequence indicate a long evolutionary history of the APRT*J mutation
- 1 October 1990
- journal article
- research article
- Published by Springer Nature in Human Genetics
- Vol. 85 (6) , 600-604
- https://doi.org/10.1007/bf00193582
Abstract
Adenine phosphoribosyltransferase (APRT) deficiency causing 2,8-dihydroxyadenine urolithiasis and renal failure is present at a high frequency among the Japanese but not other ethnic groups. A special type of mutant allele, designated APRT*J, with a nucleotide substitution at codon 136 from ATG (Met) to ACG (Thr) is carried by approximately 79% of all Japanese 2,8-dihydroxyadenine urolithiasis patients. We analyzed mutant alleles of 39 APRT deficient patients using a specific oligonucleotide hybridization method after in vitro amplification of a part of the genomic APRT sequence. We found that 24 had only APRT*J alleles. Determination of the haplotypes of 194 APRT alleles from control Japanese subjects and of the 48 different APRT*J alleles indicated that normal alleles occur in four major haplotypes, whereas all APRT*J alleles occur in only two. These results suggest that all APRT*J alleles have a single origin and that this mutant sequence has been maintained for a long period, as calculated from the frequency of the recombinant alleles.This publication has 24 references indexed in Scilit:
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