title: [Genetic polymorphism of CYP-1A1, CYP2D6 and risks of chronic benzene poisoning].
abstract: OBJECTIVE
  To explore the relationship between genetic polymorphisms of CYP-1A1 and CYP2D6 and risks of chronic benzene poisoning (BP).
  
  
  METHODS
  A case control study was conducted. 152 BP patients and 152 workers occupationally exposed to benzene without poisoning manifestations were involved. Polymerase chain reaction followed by restriction fragment length polymorphism (PCR-RFLP) technology was used for detecting the single nucleotide polymorphisms (SNPs) of MspI in the non-coding region of CYP-1A1 gene and c.188, g.212 position in the first extron of CYP2D6 gene.
  
  
  RESULTS
  The individuals with CYP1A1 MspI T/T genotype had a 1.32 times (95% CI: 1.05 approximately 1.65, P = 0.02) increased risk of BP compared with those carrying T/C and C/C genotypes. In no-smoking population, there was a 1.56 times (95% CI: 1.15 approximately 2.12, P = 0.003) increased risk of BP for subjects carrying CYP1A1 MspIT/T genotype compared with those carrying T/C and C/C genotypes. The individuals carrying CYP2D6 c.188 C/C or C/T genotype had a 1.23 times (95% CI: 1.05 approximately 1.42, P = 0.01) increased risk compared with those carrying T/T genotypes. In no-smoking population, there was a 1.23 times (95% CI: 1.04 approximately 1.47, P = 0.01) increased risk of BP for subjects carrying CYP2D6 c.188 C/C or C/T genotypes compared with those carrying T/T genotype. The single nucleotide polymorphism of g.212 position in the first extron of CYP2D6 gene had not been validated.
  
  
  CONCLUSIONS
  The individuals with CYP2D6 c.188 C/C, CYP2D6 c.188 C/T and CYP1A1 MspIT/T genotypes tend to be more susceptible to benzene toxicity.
authors.affiliation: Department of Occupational Health, School of Public Health, Fudan University, Shanghai 200032, China.
authors.forename: Shou-yong
authors.initials: SY
authors.lastname: Gu
authors.forename: Zhong-bin
authors.initials: ZB
authors.lastname: Zhang
authors.forename: Duo-zhi
authors.initials: DZ
authors.lastname: Cao
authors.forename: Jun-xiang
authors.initials: JX
authors.lastname: Wan
authors.forename: Xiao-ling
authors.initials: XL
authors.lastname: Gao
authors.forename: Xi-peng
authors.initials: XP
authors.lastname: Jin
authors.forename: Zhao-lin
authors.initials: ZL
authors.lastname: Xia
mesh_terms: D000293:Adolescent; D000328:Adult; D001554:Benzene / Q000506:poisoning*; D016022:Case-Control Studies; D002908:Chronic Disease; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D019389:Cytochrome P-450 CYP2D6 / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D019363:Cytochrome P-450 CYP1A1; D019389:Cytochrome P-450 CYP2D6; D001554:Benzene