【摘要】 目的研究焦炉工XRCC1基因多态性与外周血淋巴细胞染色体损伤易感性的关系。方法选取141名焦炉工和66名医护人员作为研究对象。以尿中1羟基芘浓度评价多环芳烃暴露内剂量,采用双核淋巴细胞微核的方法评价个体染色体损伤水平,聚合酶链反应限制性片段长度多态性的方法分析XRCC1基因4个单体型标签单核苷酸多态性位点(C26304T、G27466A、G28152A和G36189A),Clark运算法则确定个体XRCC1基因的单体型等位基因和单体型对,协方差分析校正年龄、性别、环氧化物水化酶基因型组合和尿1羟基芘水平,比较具有不同XRCC1基因型或单体型对个体外周血淋巴细胞微核率的差异。结果焦炉工尿1羟基芘为12.0μmol/mol肌酐(95%CI值为10.4～13.9μmol/mol肌酐),微核率为(0.95±0.66)%;对照组的尿1羟基芘为0.7μmol/mol肌酐(95%CI值为0.6～1.3μmol/mol肌酐),微核率为(0.40±0.36)%,差异有统计学意义,P<0.01。焦炉工的XRCC1基因CGGG单体型与外周血淋巴细胞染色体损伤水平降低有关联,TGGG和CGAG单体型与染色体损伤水平显著性增加有关联。结论焦炉工XRCC1基因多态性可影响其染色体损伤的易感性,基于XRCC1单体型的关联研究比基于单个单核苷酸多态性的研究更为敏感。更多还原

【Abstract】 Objective To investigate the association of XRCC1 polymorphisms and chromosomal damage levels in peripheral blood lymphocyte in coke-oven workers.Methods The study included 141 coke-oven workers who exposed to a high level of polycyclic aromatic hydrocarbon and 66 non-exposed controls. Urinary 1-hydroxypyrene and chromosome damage in peripheral lymphocyte were measured. Four haplotpe-tagging single nucleotide polymorphisms in XRCC1 gene, including C26304T, G27466A, G28152A and G36189A, were detected and the XRCC1 haplotypes were estimated by using an extension of Clark algorithm. The associations between haplotype pairs and micronuclei data were assessed by analysis of covariance in the exposed and non-exposed groups.Results The geometric means of urinary 1-hydroxypyrene levels in coke-oven workers and the controls were 12.0 and 0.7 μmol/mol Cr respectively (P<0.01). The cytokinesis-block micronucleus cytokinesis-block micronucleus frequencies (number of micronucleus per 1 000 binucleated lymphocytes) was significantly higher in coke-oven workers (0.95±0.66)% than in the controls (0.40±0.36)%, P<0.01. The haplotype CGGG was associated with the decreased frequencies of total micronucleus, and the haplotypes TGGG (P=0.01) and CGAG (P<0.05) were associated with the increased frequencies of total micronucleus in the multivariate analysis with adjustment for covariates among coke-oven workers.Conclusions The genetic polymorphisms of XRCC1 gene could influence the chromosome damage levels in coke-oven workers.更多还原