氨基咪唑氨甲酰转移酶基因多态性在类风湿关节炎患者甲氨蝶呤治疗中的研究

目的 探讨类风湿关节炎(RA)患者氨基咪唑氨甲酰转移酶(ATIC)基因347C/G(rs2372536)单核苷酸多态性(SNP)与甲氨蝶呤(MTX)疗效和不良反应的相关性.方法 收集RA患者359例,分为单用MTX组、MTX联用其他改善病情药(DMARDs)组、非MTX的DMARDs组,于治疗前和治疗后12、24周检查患者临床及实验室指标,评价疗效(采用ACR20)及不良反应.采用实时荧光定量聚合酶链反应(PCR)法检测RA患者及340名健康对照组的ATIC基因C347G多态性,比较2组间基因型分布及等位基因频率.结果 RA与健康对照组ATIC基因347C/G基因型分布频率差异无统计学意义(P>0.05).单用MTX治疗组的有效率为72%(77/107例),有效组ATIC 347CC,CG,GG基因型与无效组间差异无统计学意义(P>0.05),不良反应发生率为32.7%,且携带ATIC G等位基因型患者的不良反应发生率(22.4%)明显高于CC基因型组(10.3%)(OR=2.67,95%可信区间为1.27～5.59),差异有统计学意义(P<0.05).MTX联用其他DMARDs(128例)组及非MTX的DMARDs组(90例),ATIC基因多态性与其疗效及不良反应无关(P>0.05).结论 ATIC基因347C/G多态性在RA患者与健康对照组间差异无统计学意义;与MTX治疗RA的疗效无明显相关性,但ATIC G等位基因与MTX的不良反应密切相关.因此ATIC基因347C/G多态性可能作为患者使用MTX的出现不良反应的预测指标.

The relationship between the single nucleotide polymorphism of aminoimidazole carboxamide ribonucleotide transformylase gene and the treatment of methotrexate in rheumatoid arthritis

Objective To investigate the relationship between the single nucleotide polymorphism of aminoimidazole carbexamide ribonucleotide transformylase gene and the efficacy and toxicity of methotrexate treatment in rheumatoid arthritis. Methods Total of 359 patients with RA were divided into mono-therapy with MTX group, combination therapy with other DMARDs group and other DMARDs combination with no MTX treatment group. The clinical and laboratory measurements were evaluated before therapy and 12, 24 weeks after therapy. Efficacy (evaluated by ACR20) and side effects of the drugs were also assessed. Real-time fluorescent quantitative PCR was conducted to test ATIC 347C/G mutation in RA patients and 340 healthy controls. Results There was no statistical significant difference in 347 CC, CG, GG between RA patients and healthy controls. In the MTX mono-therapy group (n=107), 72% (n=77) there was no statistical significant difference in 347CC, CG, GG between patients with good response and patients without efficacy. 32.7%(n=35) of these patients experienced adverse drug reactions. The ATIC G allele carriers (22.4%) experienced a greater frequency of side effects than the CC carriers (OR=2.672, 95%CI, 1.27～5.59, P<0.05). In MTX combined with other DMARDs group (n=128) and other DMARDs combination without MTX group (n=90), the polymorphism in the ATIC gene was not associated with good clinical response and adverse events (P>0.05). Conclusion There is no statistical significant difference between RA and healthy controls in the ATIC347 gene. Polymorphism in the ATIC gene is not associated with clinical response to MTX treatment, but the ATIC347 G allele is associated with MTX toxicity. It maybe used to predict the adverse drug reactions of patients who take MTX.