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Background  The associations of the 5,10-methylenetetrahydrofolate reductase gene ( MTHFR ) rs1801133 polymorphism with coronary artery disease (CAD) and plasma lipid levels have been widely investigated, but the results were inconsistent and inconclusive. This meta-analysis aimed to clarify the relationships of the rs1801133 polymorphism with CAD and plasma lipid levels.    Methods  By searching in PubMed, Google Scholar, Web of Science, Cochrane Library, Wanfang, VIP and CNKI databases, 123 studies (87,020 subjects) and 65 studies (85,554 subjects) were identified for the CAD association analysis and the lipid association analysis, respectively. Odds ratio (OR) and standardized mean difference (SMD) were used to determine the effects of the rs1801133 polymorphism on CAD risk and lipid levels, respectively.    Results  The variant T allele of the rs1801133 polymorphism was associated with increased risk of CAD under allelic model [OR = 1.11, 95% confidence interval (CI) = 1.06–1.17,  P  < 0.01], additive model (OR = 1.25, 95% CI = 1.14–1.37,  P  < 0.01), dominant model (OR = 1.11, 95% CI = 1.04–1.17,  P  < 0.01), and recessive model (OR = 1.22, 95% CI = 1.12–1.32,  P  < 0.01). The T carriers had higher levels of total cholesterol (TC) (SMD = 0.04, 95% CI = 0.01–0.07,  P  = 0.02) and low-density lipoprotein cholesterol (LDL-C) (SMD = 0.07, 95% CI = 0.01–0.12,  P  = 0.01) than the non-carriers.    Conclusions  The meta-analysis suggested that the T allele of the rs1801133 polymorphism is a risk factor for CAD, which is possibly and partly mediated by abnormal lipid levels.    Electronic supplementary material  The online version of this article (10.1186/s12944-018-0837-y) contains supplementary material, which is available to authorized users.

Associations of the MTHFR rs1801133 polymorphism with coronary artery disease and lipid levels: a systematic review and updated meta-analysis