Genetic analysis of thiopurine methyltransferase polymorphism in the Jordanian population

Nancy Hakooz, Tawfiq Arafat, Debbie Payne, William Ollier, Sudeep Pushpakom, Julie Andrews, William Newman

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This study provides the first analysis of the TPMT mutant allele frequency in a sample of the Jordanian population and indicates that TPMT*3A is the most common allele in Jordanian subjects. Purpose: Thiopurine methyltransferase TPMT catalyses the S-methylation of thiopurine drugs such as 6-mercaptopurine, 6-thioguanine, and azathiopurine. Thiopurine methyltransferase (TPMT) polymorphisms are the major determinants of interindividual differences in the severe haematological toxicity of 6-mercaptopurine. Several variants in the TPMT gene have been identified that correlate with a low activity phenotype. Four variant alleles, TPMT*2, TPMT*3A, TPMT*3B and TPMT*3C, are responsible for over 80% of the low or undetectable enzyme activity. The allelic frequency of TPMT variants has been established in many populations. Methods: In this study, the frequencies of four (TPMT*2, TPMT*3A, TPMT*3B and TPMT*3C) variants were investigated in 169 healthy Jordanian men (18-45 years of age). Single nucleotide polymorphisms (SNPs) were genotyped using the Sequenom® MassARRAY technology (Sequenom®; San Diego, CA, USA). Results: TPMT*3A and TPMT*3C were the only deficiency alleles detected in the Jordanian population with an allele frequency of 0.59% and 0.30% respectively. The TPMT*3A allele frequency is found to be lower than in the European Caucasian population. Conclusion: TPMT*3A and TPMT*3C were the only deficiency alleles detected in the Jordanian population with an allele frequency of 0.59% and 0.30% respectively. The TPMT*3A allele frequency is found to be lower than in the European Caucasian population. © 2010 Springer-Verlag.
    Original languageEnglish
    Pages (from-to)999-1003
    Number of pages4
    JournalEuropean journal of clinical pharmacology
    Volume66
    Issue number10
    DOIs
    Publication statusPublished - Oct 2010

    Keywords

    • Genotyping
    • Jordanian population
    • TPMT

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