title: Cytochrome P450 2E1 gene polymorphisms/haplotypes and anti-tuberculosis drug-induced hepatitis in a Chinese cohort.
abstract: OBJECTIVE
  The pathogenic mechanism of anti-tuberculosis (anti-TB) drug-induced hepatitis is associated with drug metabolizing enzymes. No tagging single-nucleotide polymorphisms (tSNPs) of cytochrome P450 2E1(CYP2E1) in the risk of anti-TB drug-induced hepatitis have been reported. The present study was aimed at exploring the role of tSNPs in CYP2E1 gene in a population-based anti-TB treatment cohort.
  
  
  METHODS
  A nested case-control study was designed. Each hepatitis case was 14 matched with controls by age, gender, treatment history, disease severity and drug dosage. The tSNPs were selected by using Haploview 4.2 based on the HapMap database of Han Chinese in Beijing, and detected by using TaqMan allelic discrimination technology.
  
  
  RESULTS
  Eighty-nine anti-TB drug-induced hepatitis cases and 356 controls were included in this study. 6 tSNPs (rs2031920, rs2070672, rs915908, rs8192775, rs2515641, rs2515644) were genotyped and minor allele frequencies of these tSNPs were 21.9%, 23.0%, 19.1%, 23.6%, 20.8% and 44.4% in the cases and 20.9%, 22.7%, 18.9%, 23.2%, 18.2% and 43.2% in the controls, respectively. No significant difference was observed in genotypes or allele frequencies of the 6 tSNPs between case group and control group, and neither of haplotypes in block 1 nor in block 2 was significantly associated with the development of hepatitis.
  
  
  CONCLUSIONS
  Based on the Chinese anti-TB treatment cohort, we did not find a statistically significant association between genetic polymorphisms of CYP2E1 and the risk of anti-TB drug-induced hepatitis. None of the haplotypes showed a significant association with the development of hepatitis in Chinese TB population.
authors: Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Centre, Beijing, China.
authors: Shaowen
authors: S
authors: Tang
authors: Xiaozhen
authors: X
authors: Lv
authors: Yuan
authors: Y
authors: Zhang
authors: Shanshan
authors: S
authors: Wu
authors: Zhirong
authors: Z
authors: Yang
authors: Yinyin
authors: Y
authors: Xia
authors: Dehua
authors: D
authors: Tu
authors: Peiyuan
authors: P
authors: Deng
authors: Yu
authors: Y
authors: Ma
authors: Dafang
authors: D
authors: Chen
authors: Siyan
authors: S
authors: Zhan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000995:Antitubercular Agents / Q000009:adverse effects*; D044466:Asian People / Q000235:genetics*; D056486:Chemical and Drug Induced Liver Injury / Q000201:enzymology* / Q000235:genetics*; D002681:China; D015331:Cohort Studies; D019392:Cytochrome P-450 CYP2E1 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D020022:Genetic Predisposition to Disease; D006239:Haplotypes / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D012307:Risk Factors; D055815:Young Adult
chemical_list: D000995:Antitubercular Agents; D019392:Cytochrome P-450 CYP2E1