title: Genetic differences in CYP2C19 single nucleotide polymorphisms among four Asian populations.
abstract: BACKGROUND
  This study was designed to compare genetic differences in single-nucleotide polymorphisms of the S-mephenytoin 4'-hydroxylation (CYP2C19) gene among four Asian populations.
  
  
  METHODS
  Polymerase chain reaction with restriction fragment length polymorphism (PCR-RFLP) analysis of CYP2C19 was conducted in Japanese, Chinese, Thai, and Vietnamese populations. All genotype frequencies were analyzed. Wild-type homozygote and wild-type heterozygote genotypes were extensive proton pump inhibitor (PPI) metabolizers. Mutant-type heterozygote and mutant-type homozygote genotypes were poor PPI metabolizers.
  
  
  RESULTS
  No significant differences in CYP2C19 phenotype, calculated based on genotype frequencies, (P > 0.05) were found among the four populations.
  
  
  CONCLUSIONS
  Many factors, including CYP2C19 polymorphisms, affect the success rate of Helicobacterpylori eradication with PPI-based therapy. We suspect that CYP2C19 polymorphisms may not be the main factor associated with differences among these four Asian populations in the success rates of H. pylori eradication with PPI-based therapy.
authors.affiliation: First Department of Surgery, Nippon Medical School, Tokyo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yamada
authors.forename: M
authors.initials: M
authors.lastname: Onda
authors.forename: S
authors.initials: S
authors.lastname: Kato
authors.forename: N
authors.initials: N
authors.lastname: Matsuda
authors.forename: T
authors.initials: T
authors.lastname: Matsuhisa
authors.forename: N
authors.initials: N
authors.lastname: Yamada
authors.forename: M
authors.initials: M
authors.lastname: Miki
authors.forename: N
authors.initials: N
authors.lastname: Matsukura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001189:Aryl Hydrocarbon Hydroxylases; D001208:Asia; D065731:Cytochrome P-450 CYP2C19; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics* / Q000378:metabolism; D005260:Female; D005828:Genetics, Population; D005838:Genotype; D016481:Helicobacter Infections / Q000188:drug therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D006899:Mixed Function Oxygenases / Q000235:genetics* / Q000378:metabolism; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D054328:Proton Pump Inhibitors
chemical_list: D054328:Proton Pump Inhibitors; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19