A MUTANT ALLELE COMMON TO THE TYPE-I ADENINE PHOSPHORIBOSYLTRANSFERASE DEFICIENCY IN JAPANESE SUBJECTS

作者：MIMORI A; HIDAKA Y; WU VC; TARLE SA; KAMATANI N; KELLEY WN; PALLELA TD

来源：American Journal of Human Genetics, 1991, 48(1): 103-107.

Adenine phosphoribosyltransferase (APRT) deficiency is a genetic disorder which causes 2,8-dihydroxyadenine urolithiasis. The estimated incidence of heterozygosity in Caucasian and Japanese populations is 1%. Mutant alleles responsible for the disease have been classified as APRT*Q0 (type I) and APRT* (type II). In our previous study, we demonstrated in APRT*J a single common base change which accounts for 70% of the Japanese mutants. The present report describes the analysis of an APRT*Q0 mutation in Japanese subjects. Two nucleotide substitutions common to all seven affected alleles from four unrelated subjects (three homozygotes and a heterozygote) were identified: G-->A at nucleotide position 1453 and C-->T at 1456. The G-->A altered the amino acid Trp98 to a stop codon. The C-->T did not alter Ala99. These point mutations were demonstrated by sequence analysis of polymerase chain reaction (PCR)-amplified genomic DNA and cDNA. The G-->A change at 1453 results in the elimination of a PaMI site in the APRT gene. PaMI digests, which were used to confirm the G-->A transition, can be useful in screening for this specific mutation.

• 出版日期1991-1