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[Associations of polymorphisms of methionine synthase A2756G and methionine synthase reductase G66A with the risks of coronary artery disease: a meta-analysis].

OBJECTIVE
To evaluate the associations between polymorphisms of methionine synthase(MTR) A2756G and methionine synthase reductase(MTRR) G66A and risk of coronary artery disease.


METHODS
Literatures in Medline reporting the relationship between polymorphisms of MTR A2756G and MTRR G66A and risk of coronary artery disease from January 1990 to May 2010 were searched. A total of 14 relevant articles were selected and 13 of them met the criteria. A Meta-analysis was performed to estimate the pooled odds ratio (OR) to evaluate the relationship between polymorphisms of MTR A2756G and MTRR G66A and risk of coronary artery disease. All analyses were performed using the STATA statistical software.


RESULTS
Among the 13 studies, eight case-control studies containing 2143 cases of coronary artery disease and 2270 controls were included in the analysis of MTR A2756G and risk of coronary artery disease. Meanwhile, five case-control studies with 811 cases of coronary artery disease and 387 controls were included in the analysis of MTRR G66A and risk of coronary artery disease. In the analysis of MTRR G66A related to the risk of coronary artery disease, there were 246 GG carries, 397 AG carriers and 168 AA carriers in the group of coronary artery disease, against 102 GG carriers, 203 AG carriers and 82 AA carriers in the control group. Compared with the MTRR GG carriers, the risk of coronary artery disease decreased significantly by 27% (OR = 0.73, 95%CI: 0.54 - 0.99) and 25% (OR = 0.75, 95%CI: 0.56 - 1.00) (Egger's test t = -0.19, P = 0.862) in the MTRR 66 AG and AG/AA carriers, respectively, and also decreased in the MTRR AA carriers but significant difference was observed (OR = 0.84, 95%CI: 0.42 - 1.68). There was no significant association between coronary artery disease and MTR A2756G.


CONCLUSION
These results suggest that MTRR66 may play a role in coronary artery disease susceptibility. MTRR 66 A allele carries are associated with a statistically significant decreased risk of coronary artery disease susceptibility.