title: CYP2C19 genetic polymorphism in Thai, Burmese and Karen populations.
abstract: The genetic polymorphism of CYP2C19 was examined in three Southeast Asian populations. This study was conducted in 774 Thais, 127 Burmeses and 131 Karens. Genomic DNA was extracted from leucocytes and analyzed by the PCR-RFLP technique. Genotype analysis revealed that the allele frequencies of CYP2C19*1, CYP2C19*2 and CYP2C19*3 in the Thais were 0.68, 0.29 and 0.03, respectively, and those of the Burmese population were 0.66, 0.30 and 0.04, respectively. For Karens, the minority ethnic in Mynmar, the allele frequencies of CYP2C19*1, CYP2C19*2 and CYP2C19*3 were 0.71, 0.28 and 0.01, respectively. The prevalence of PM estimated from genotype data among these three ethnic populations were 9.2%, 11.0%, and 8.4%, respectively. The PM phenotype and the frequencies of CYP2C19 defective alleles, particularly CYP2C19*3 among these three Southeast Asian ethnics appeared to be lower than other Asian populations. Lower prevalence of CYP2C19 PM suggests that these ethnics may have different capacity to metabolize drugs that are substrates of CYP2C19. Certain drug dosage regiments should be considered differently for Asian populations.
authors.affiliation: Department of Pharmacology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand. wichitt@kku.ac.th
authors.forename: Wichittra
authors.initials: W
authors.lastname: Tassaneeyakul
authors.forename: Werawath
authors.initials: W
authors.lastname: Mahatthanatrakul
authors.forename: Kanokporn
authors.initials: K
authors.lastname: Niwatananun
authors.forename: Kesara
authors.initials: K
authors.lastname: Na-Bangchang
authors.forename: Arporn
authors.initials: A
authors.lastname: Tawalee
authors.forename: Nathawut
authors.initials: N
authors.lastname: Krikreangsak
authors.forename: Utaiwan
authors.initials: U
authors.lastname: Cykleng
authors.forename: Wongwiwat
authors.initials: W
authors.lastname: Tassaneeyakul
mesh_terms: D000328:Adult; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D044466:Asian People / Q000235:genetics*; D065731:Cytochrome P-450 CYP2C19; D005006:Ethnicity / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D006899:Mixed Function Oxygenases / Q000235:genetics*; D002052:Myanmar; D011110:Polymorphism, Genetic / Q000235:genetics*; D013785:Thailand
chemical_list: D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19