Validation of new allele-specific real-time PCR system for thiopurine methyltransferase genotyping in Korean population.

Abstract:

INTRODUCTION:Thiopurine drugs are metabolized via S-methylation and catalyzed by thiopurine S-methyltransferase (TPMT). Patients with very low TPMT activity are at high risk of fatal bone marrow toxicity when standard doses of thiopurine drugs are administered. TPMT genotyping can predict TPMT activity and is not affected by transfusion or red blood cell defects. Here, we report a new allele-specific real-time polymerase chain reaction (PCR) system for thiopurine methyltransferase genotyping that is validated in Korean population. MATERIALS AND METHODS:Three major TPMT single-nucleotide polymorphisms (TPMT 2, 3B, and 3C) were genotyped using real-time PCR with the allele-specific primers and probes. Internal positive controls were included in each well, and an automatic interpretative algorithm was applied. This system was validated using 244 clinical samples and 2 commercial DNA samples that had been previously genotyped using PCR-direct sequencing. Results. All of the obtained results are concordant with those of the reference method. All of the internal positive control reactions were successful. The allele frequency of TPMT 3C was 2.05% (10 of 488 alleles). All of the patients with variant alleles were heterozygotes, and no homozygotes were detected. No TPMT 2, 3A, or 3B alleles were observed in this Korean population. CONCLUSION:This rapid, accurate, and user-friendly genotyping system can be readily used to improve the efficacy and safety of thiopurine treatments in clinical practice.

journal_name

Biomed Res Int

authors

Kim S,Lee HW,Lee W,Chun S,Min WK

doi

10.1155/2013/305704

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

305704

eissn

2314-6133

issn

2314-6141

journal_volume

2013

pub_type

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