Objective To evaluate the association between site polymorphism of glutathione S-transferase omega1 (GSTO1) gene (rs4925),arsenic (+3) methyhransferase (As3MT) gene (rs11191439) and susceptibility to endemic arsenic poisoning.Methods All related studies in published papers up to March 1,2018 on association between site polymorphism of As3MT gene,GSTO1 gene and susceptibility to endemic arsenic poisoning were collected by searching PubMed,Embase,CNKI,Wanfang and VIP database.The data were screened according to the inclusion and exclusion criteria,and extracted,the quality of included studies was evaluated.The pooled odds ratios (OR) with 95％ confidence intervals (95％CI) were calculated using Review Manager 5.3 software.Publication bias and sensitivity analysis were also assessed.Results A total of 7 case-control studies involving 989 cases and 1 212 controls were included in the Meta-analysis.Individuals carrying at least one allele A at the rs4925 locus of the GSTO1 gene might increase the risk of susceptibility to arsenic poisoning compared with individuals carrying wild homozygous type [AA + CA vs CC,OR (95％CI) =1.37 (1.13,1.65),P ＜ 0.01].There was no statistically significant relationship between susceptibility to arsenic poisoning in individuals with at least one allele C at the rs1 1191439 locus of the As3MT gene compared with individuals carrying wild homozygous type [CC + TC vs TT,OR (95％CI) =1.12 (0.69,1.81),P ＞ 0.05].Conclusions GSTO1 gene rs4925 polymorphism is significantly associated with susceptibility to arsenic poisoning,and the A allele is a risk gene for susceptibility to arsenic poisoning.The As3MT gene rs1 1191439 locus polymorphism is not associated with susceptibility to arsenic poisoning.

Objective To investigate the relationship between nucleotide excision repair cross-complementing (ERCC) gene polymorphisms [single nucleotide polymorphism (SNP) sites: rs11615, rs13181, rs238406, rs6498486, rs17655] and susceptibility to endemic arsenic poisoning. Methods The study recruited 848 subjects, including 348 cases and 500 controls, from populations exposed to high arsenic levels through drinking water in northwest China, and 3 - 5 ml venous blood was collected. The genotypes were determined using polymerase chain reaction and restriction fragment length polymorphism techniques(PCR-RFLP). Logistic regression analysis was used to assess the association of genotypes with endemic arsenic poisoning. Results The polymorphisms of rs11615 (ERCC1), rs238406 (ERCC2), rs6498486 (ERCC4) and rs17655 (ERCC5) and endemic arsenic poisoning were not related(P > 0.05). Participants who carried the CC genotype or at least one C allele for the ERCC2 rs13181 had an increased risk of endemic arsenic poisoning[OR(95%CI)=1.63(1.13,2.34),1.64(1.14,2.34)]compared with wild type homozygous individuals. Conculsions There is no positive correlation between the polymorphisms of ERCC1 rs11615, ERCC2 rs238406, ERCC4 rs6498486, ERCC5 rs17655 and endemic arsenic poisoning. ERCC2 rs13181 polymorphism increases the risk of endemic arsenic poisoning.