Authors: Maryam Moini Fatemeh Ghaderi Mohamad Mehdi Sagheb Ali Reza Tavasolli Negar Azarpira Masumeh Darai Bita Geramizadeh
Publish Date: 2011/09/22
Volume: 39, Issue: 4, Pages: 4581-4587
Abstract
Thiopurine methyltransferase TPMT catalyzes the Smethylation of thiopurine drugs such as 6mercaptopurine 6thioguanine and azathiopurine Variability in TPMT activity is mainly due to genetic polymorphism The frequency of the four allelic variants of the TPMT gene TPMT2 G238C TPMT3A G460A and A719G TPMT3B G460A and TPMT3C A719G were determined in an Iranian population from south of Iran n = 500 using polymerase chain reaction PCRRFLP and allelespecific PCRbased assays Four hundred seventy four persons 948 were homozygous for the wild type allele TPMT1/1 and twenty five people were TPMT1/3C 5 One patient was found to be heterozygous in terms TPMT1 and 2 alleles with genotype of TPMT1/2 02 None of the participants had both defective alleles The TPMT3C and 2 were the only variant alleles observed in this population The total frequency of variant alleles was 26 and the wild type allele frequency was 974 The TPMT3B and 3A alleles were not detected Distributions of TPMT genotype and allele frequency in Iranian populations are different from the genetic profile found among Caucasian or Asian populations Our findings also revealed interethnic differences in TPMT frequencies between different parts of Iran This view may help clinicians to choose an appropriate strategy for thiopurine drugs and reduce adverse drug reactions such as bone marrow suppression
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