焦炉作业工人核苷酸剪切修复酶基因多态性与染色体损伤的关系

Association between nucleotide excision repair gene polymorphisms and chromosomal damage in coke-oven workers

目的研究核苷酸剪切修复酶基因多态性与焦炉作业工人外周血淋巴细胞染色体损伤易感性的关系。方法以140名焦炉作业工人(暴露组)和66名医务人员(对照组)作为研究对象,测定尿中1羟-基芘浓度反映多环芳烃暴露内剂量,用双核淋巴细胞微核评价个体外周血淋巴细胞染色体损伤,采用聚合酶链-限制性片段长度多态性方法分析ERCC1、ERCC2、ERCC4、ERCC5、ERCC6基因多态性,多元统计方法分析不同基因型与染色体损伤水平的关系。结果在校正年龄、性别、mEH基因型、自然对数转换后的尿1羟-基芘水平后,暴露组中ERCC1基因19007位点CC基因型个体微核率[(1.05±0.68)%]显著高于CT基因型[(0.81±0.66)%](P=0.01),或TT[(0.66±0.37)%](P=0.05),或CT+TT基因型个体[(0.75±0.63)%](P=0.004)。ERCC6基因3368位点AA基因型个体微核率[(1.00±0.69)%]显著高于AG[(0.67±0.42)%](P=0.05),或AG+GG基因型个体[(0.66±0.41)%](P=0.02)。进一步按焦炉工年龄均数(39.1岁)分层,发现在高年龄组ERCC1 C19007T和ERCC6 A3368G位点多态性与染色体损伤水平相关联;另外,高年龄组中ERCC2 G23591A位点GA基因型个体微核率[(1.40±0.63)%]高于GG基因型个体[(0.98±0.59)%](P=0.01)。结论ERCC1 C19007T、ERCC6 A3368G以及ERCC2 G23591A位点的多态性能够影响职业性多环芳烃暴露导致的外周血淋巴细胞染色体损伤水平。

Objective To investigate the association of polymorphisms of nucleotide excision repair genes and chromosomal damage in peripheral blood lymphocytes among coke-oven workers. Methods The genotypes of ERCC1 C19007T, ERCC2 C22541A, ERCC2 G23591A, ERCC2 A35931C, ERCC4 T30028C, ERCC5 G3507C and ERCC6 A3368G among 140 coke-oven workers and 66 non-coke-oven controls were determined by PCR-PFLP methods. Chromosomal damage was detected by cytokinesis-block micronucleus （CBMN） assay. Results Multivariate analysis of covariance revealed that in coke-oven workers, the ERCC1 19007 CC genotype exhibited significantly higher CBMN frequency [（1.05±0.68）%] than did the CT [（0.81±0.66）%]（P=0.01） or TT[（0.66±0.37）%] （P=0.05） or CF＋TT genotypes [（0.75±0.63）%] （P = 0.004）. For the ERCC6 A3368G polymorphism, AA genotype exhibited significantly higher CBMN frequency [（1.00±0.69）%] than did the AG [（0.67±0.42）%] （P = 0.05） or AG ＋ GG genotypes [（0.66±0.41）%] （P = 0.02）. Stratification analysis found the significant association between the two polymorphisms, ERCC1 C19007T and ERCC6 A3368G, and the CBMN frequencies were most pronounced in older workers. In addition, for the polymorphism of ERCC2 G23591A, GA carriers had significantly higher CBMN frequencies [（1.40±0.63）%] than those GG carriers [（0.98±0.59）%] （P = 0.01） in older workers. Conclusions Our results suggested that polymorphisms of ERCC1 C19007T, ERCC6 A3368G and ERCC2 G23591A were associated with the CBMN frequencies in coke-oven workers.