Matrix metalloproteinase-1 gene polymorphisms and periodontitis susceptibility: A meta-analysis based on 11 case-control studies

Matrix metalloproteinase-1 has been implicated in periodontal disease, but the association between the most-studied Matrix metalloproteinase-1 1G-to-2G polymorphism and the risk of periodontal disease were reported with inconclusive results. Therefore, the aim of this study was to investigate the association between the Matrix metalloproteinase-1 1G-to-2G polymorphism and periodontal disease. Electronic databases search yielded 11 studies with 1447 patients and 1710 control subjects evaluated the association of the polymorphisms of Matrix metalloproteinase-1 1G-to-2G and periodontitis risk were brought into this study. The association was evaluated by odds ratio (OR) and its 95% confidence interval (CI). The overall results showed that the variant genotypes were associated with a significantly increased risk of periodontitis (OR = 1.45, 95% CI = 1.02-1.26 for 2G/2G vs 1G/1G, and OR = 2.27, 95% CI = 1.22-4.23 for 2G/2G vs 1G/2G + 1G/1G). In the stratified analyses, there was a significantly increased risk for the studies of periodontitis (OR = 1.59, 95% CI = 1.15-2.21 for 2G/2G vs 1G/1G; OR = 3.48, 95% CI = 1.39-8.71 for 2G/2G vs 1G/2G + 1G/1G), which remained for the studies of Asian populations. And there was a significantly increased risk of severe periodontitis (OR = 2.15, 95% CI = 1.35-3.43 for 2G/2G vs 1G/1G; OR = 2.86, 95% CI = 1.31-2.64 for 2G/2G vs 1G/2G + 1G/1G; OR = 1.6, 95% CI = 1.12-2.39 for 1G/2G + 2G/2G vs 1G/1G; OR = 1.61, 95% CI = 1.28-2.03 for 2G allele vs 1G allele). The current study demonstrated that the Matrix metalloproteinase-1-1607 1G-to-2G polymorphism was associated with susceptibility to periodontitis, apparently, severe periodontitis.