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. 1983 Sep;72(3):767–772. doi: 10.1172/JCI111047

Human hypoxanthine-guanine phosphoribosyltransferase. Detection of a mutant allele by restriction endonuclease analysis.

J M Wilson, P Frossard, R L Nussbaum, C T Caskey, W N Kelley
PMCID: PMC1129241  PMID: 6309910

Abstract

We have developed a method for the direct analysis of a hypoxanthine-guanine phosphoribosyltransferase (HPRT) allele associated with a deficiency of enzyme activity and an early onset of gout. The functionally abnormal enzyme coded for by this mutant allele (HPRTToronto) differs from the normal enzyme by an arginine-to-glycine substitution at position 50. A single base change in the codon for arginine 50 can explain this substitution. Direct analysis of this point mutation is based on the observation that it abolishes a Taq I recognition site in HPRT DNA. As predicted, DNA from individuals with the HPRTToronto allele exhibited an abnormal restriction pattern when digested with Taq I and probed with HPRT complimentary DNA: a normal 2.0-kb fragment is replaced by a 4.0-kb fragment. The 4.0/2.0-kb restriction fragment variation was used to detect the HPRTToronto allele in a heterozygote that was otherwise normal with respect to the classical techniques used to diagnose heterozygosity in HPRT deficiency.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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