title: Association of polymorphisms in AhR, CYP1A1, GSTM1, and GSTT1 genes with levels of DNA damage in peripheral blood lymphocytes among coke-oven workers.
abstract: Accumulating evidence has shown that both DNA damage caused by the metabolites of polycyclic aromatic hydrocarbons (PAH) and genetic polymorphisms in PAH-metabolic genes contribute to individual susceptibility to PAH-induced carcinogenesis. However, the functional relevance of genetic polymorphisms in PAH-metabolic genes in exposed individuals is still unclear. In this study of 240 coke-oven workers (the exposed group) and 123 non-coke-oven workers (the control group), we genotyped for polymorphisms in the AhR, CYP1A1, GSTM1, and GSTT1 genes by PCR methods, and determined the levels of DNA damage in peripheral blood lymphocytes using the alkaline comet assay. We found that the ln-transformed Olive tail moment (Olive TM) values in the exposed group were significantly higher than those in the control group (P < 0.001). Furthermore, in the exposed group, the Olive TM values in subjects with the AhR Lys(554) variant genotype were higher than those with the AhR Arg(554)/Arg(554) genotype (P = 0.021). Similarly, the Olive TM values in the non-coke-oven workers with the CYP1A1 MspI CC + CT genotype were lower than the values of those with the CYP1A1 MspI TT genotype (P = 0.005). However, these differences were not evident for GSTM1 and GSTT1. These results suggested that the polymorphism of AhR might modulate the effects of PAHs in the exposed group; however, the underlying molecular mechanisms by which this polymorphism may have affected the levels of PAH-induced DNA damage warrant further investigation.
authors.affiliation: Institute of Occupational Medicine, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Hangkong Road 13, Wuhan, Hubei 430030, People's Republic of China.
authors.forename: Yongwen
authors.initials: Y
authors.lastname: Chen
authors.forename: Yun
authors.initials: Y
authors.lastname: Bai
authors.forename: Jing
authors.initials: J
authors.lastname: Yuan
authors.forename: Weihong
authors.initials: W
authors.lastname: Chen
authors.forename: Jianya
authors.initials: J
authors.lastname: Sun
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Huashan
authors.initials: H
authors.lastname: Liang
authors.forename: Liang
authors.initials: L
authors.lastname: Guo
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Yang
authors.forename: Hao
authors.initials: H
authors.lastname: Tan
authors.forename: Yougong
authors.initials: Y
authors.lastname: Su
authors.forename: Qingyi
authors.initials: Q
authors.lastname: Wei
authors.forename: Tangchun
authors.initials: T
authors.lastname: Wu
mesh_terms: D000328:Adult; D003077:Coke; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D004249:DNA Damage; D005838:Genotype; D005982:Glutathione Transferase / Q000235:genetics*; D006801:Humans; D008214:Lymphocytes / Q000378:metabolism*; D008297:Male; D016273:Occupational Exposure; D011084:Polycyclic Aromatic Hydrocarbons / Q000378:metabolism / Q000633:toxicity; D011110:Polymorphism, Genetic; D018336:Receptors, Aryl Hydrocarbon / Q000235:genetics*
chemical_list: D003077:Coke; D019363:Cytochrome P-450 CYP1A1; D005982:Glutathione Transferase; D011084:Polycyclic Aromatic Hydrocarbons; D018336:Receptors, Aryl Hydrocarbon; C413545:glutathione S-transferase T1