title: CYP2E1 gene rs6413420 polymorphism was first found in the Bouyei ethnic group of China.
abstract: BACKGROUND
  China is a multinational country. The relationship between gene polymorphisms of xenobiotic metabolizing enzymes and national ethnicity has not previously investigated among Chinese people. The aim of this study was to investigate distributions of CYP1A1 and CYP2E1 gene polymorphisms in five ethnic groups of China.
  
  
  METHODS
  829 blood samples were collected from five ethnic groups (Han, Shui, Miao, Zhuang, Bouyei). Taqman-MGB probe was used in Real-time PCR to test the gene polymorphisms of CYP1A1 (rs1048943 and rs4646903) and CYP2E1 (rs2031920 and rs6413420). We further validate the SNP genotyping results through DNA sequencing.
  
  
  RESULTS
  The genotype distribution of all four SNPs was in accordance with Hardy-Weinberg equilibrium except the genotype distribution of rs4646903 in Han and Bouyei ethnic groups (p=0.013 and 0.0005, respectively). CYP2E1 gene rs6413420 polymorphism was first found in the Bouyei ethnic group in China. The results of DNA sequencing were entirely in line with the SNP genotyping assay.
  
  
  CONCLUSIONS
  The CYP1A1 and CYP2E1 genetic polymorphisms were different in different ethnic groups in China. CYP2E1 gene rs6413420 polymorphism was first found in the Bouyei ethnic group of China.
authors.affiliation: Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Guangdong Province, Medical Key Laboratory of Health Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention No.8, Longyuan Road, Nanshan District, Shenzhen 518055, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Guangdong Province, Medical Key Laboratory of Health Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention No.8, Longyuan Road, Nanshan District, Shenzhen 518055, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Shenzhen Entry-Exit Inspection and Quarantine Bureau Shenzhen, China.
authors.forename: Hongju
authors.initials: H
authors.lastname: Wang
authors.affiliation: Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Guangdong Province, Medical Key Laboratory of Health Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention No.8, Longyuan Road, Nanshan District, Shenzhen 518055, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Guangdong Province, Medical Key Laboratory of Health Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention No.8, Longyuan Road, Nanshan District, Shenzhen 518055, China.
authors.forename: Desheng
authors.initials: D
authors.lastname: Wu
authors.affiliation: Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Guangdong Province, Medical Key Laboratory of Health Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention No.8, Longyuan Road, Nanshan District, Shenzhen 518055, China.
authors.forename: Xifei
authors.initials: X
authors.lastname: Yang
authors.affiliation: Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Guangdong Province, Medical Key Laboratory of Health Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention No.8, Longyuan Road, Nanshan District, Shenzhen 518055, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Liu
keywords: CYP1A1; CYP2E1; Real-time PCR; SNPs; Taqman-MGB probe