A mutant allele common to the type I adenine phosphoribosyltransferase deficiency in Japanese subjects

Am J Hum Genet. 1991 Jan;48(1):103-7.


Adenine phosphoribosyltransferase (APRT) deficiency is a genetic disorder which causes 2,8-dihydroxy-adenine 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 PflMI site in the APRT gene. PflMI digests, which were used to confirm the G----A transition, can be useful in screening for this specific mutation.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adenine Phosphoribosyltransferase / deficiency
  • Adenine Phosphoribosyltransferase / genetics*
  • Alleles*
  • Amino Acid Sequence
  • Base Sequence
  • Blotting, Southern
  • Cell Line
  • DNA Probes
  • Humans
  • Molecular Sequence Data
  • Mutation*
  • Polymerase Chain Reaction
  • Restriction Mapping


  • DNA Probes
  • Adenine Phosphoribosyltransferase