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Thiopurine methyltransferase polymorphisms in a Brazilian population
W L Boson1, M A Romano-Silva, H Correa
1Departamento de Farmacologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
The Pharmacogenomics Journal
|June 20, 2003
Summary
This study analyzed Thiopurine methyltransferase (TPMT) gene variants in Brazil. It found specific frequencies for TPMT alleles, contributing to understanding drug metabolism in this diverse population.
Area of Science:
- Pharmacogenomics
- Human Genetics
Background:
- Thiopurine methyltransferase (TPMT) is crucial for metabolizing thiopurine drugs.
- TPMT gene polymorphisms are known in various ethnic groups, but data for Brazil is lacking.
- Brazil's population is highly diverse due to extensive interethnic admixture.
Purpose of the Study:
- To investigate the frequency of six common TPMT allelic variants in the Brazilian population.
- To establish baseline data for TPMT genetic variations in Brazil.
Main Methods:
- Utilized polymerase chain reaction (PCR) with restriction fragment length polymorphism (RFLP) analysis.
- Employed allele-specific PCR-based assays for precise variant detection.
Main Results:
- Determined frequencies for TPMT alleles *2 (2.2%), *3A (1.5%), *3B (0.2%), and *3C (1.0%).
- Alleles *5 and *6 were found at 0% frequency in the studied Brazilian sample.
- This represents the first comprehensive analysis of TPMT mutant allele frequencies in Brazil.
Conclusions:
- Provides foundational data on TPMT genetic diversity in Brazil.
- Essential for personalized medicine approaches in thiopurine drug therapy for Brazilians.
- Highlights the importance of considering ethnic background in pharmacogenetic studies.