DNA修复基因XRCC1多态性与辐射损伤易感性的关系

目的研究DNA修复基因XRCCl多态性与辐射损伤易感性的关系。方法采用1：1配对病例对照设计,在对唐山市放射人员体检的基础上,以113名出现染色体畸变的射线工作人员为病例组,按性别、年龄(±5岁)、民族、工种配对,选择与病例在同一工作岗位、工龄相等或稍长(≤2年)、累积受照剂量相同或相近且无辐射损伤的放射人员为对照组(113名)。以多聚酶链反应-限制性长度多态性分析技术(PCR-RFLP)检测XRCCl基因,比较不同基因型与辐射损伤易感性的关系。结果病例组XRCCl 26304TT变异基因型频率为18．58%,高于对照组(7．08%),差异有统计学意义(P＜0．05)；携带此种基因型个体发生辐射损伤的风险比携带其他基因型者高3．47倍(OR=3．47,95% CI 1．43～8．44)。XRCCl G27466A和G28152A基因型频率在两组中的分布差异无统计学意义(P＞0．05)。结论XRCCl C26304T基因多态性与辐射致染色体畸变有关联。未发现XRCCl G27466A和G28152A基因多态性与辐射致染色体畸变有关。

Relationship between polymorphisms of DNA repair gene XRCC1 and susceptibility to radiation injury

OBJECTIVE: To explore the relationship between polymorphisms of DNA repair gene XRCC1 and susceptibility to radiation injury. METHODS: In 1:1 case-control study, 113 abnormal chromosome workers exposed to ionizing radiation were selected as cases and 113 normal chromosome as controls who matched with case for sex, age (+/- 5 years), nation, type of work, the same or more but in 2 years work length and the same similar levels of the cumulative exposure radiation dose. Genotypes were analysed using PCR based restriction fragment length polymorphism techniques. RESULTS: The frequency of XRCC1 26304TT allele in case group (18.58%) was significantly higher than that in control group (7.08%), with OR for radiation damage being 3.47 (95% CI 1.43 - 8.44, P < 0.05). No association was observed between XRCC1 G27466A and G28152A and susceptibility to radiation injury. CONCLUSION: The mutation of XRCC1 C26304T is related with the susceptibility to radiation injury. The polymorphisms of XRCC1 G27466A and G28152A are not found to have association with abnormal chromosomes.