Association between cystathionine beta-synthase c.844ins68 polymorphism and risk of non-syndromic cleft lip/palate: A meta-analysis of family-based and case-control studies

Summary Objective Both genetics and environmental factors play a role in the occurrence of non-syndromic cleft lip/palate (NSCL/P). This meta-analysis evaluated the association between cystathionine beta-synthase (CBS) c.844ins68 polymorphism and risk of NSCL/P in family-based and case-control studies. Materials and methods The PubMed, Web of Science, Scopus, and Cochrane Library databases were searched for articles published until September 2018. RevMan 5.3 software was used to calculate the odds ratio (OR) for the association between CBS c.844ins68 polymorphism and risk of NSCL/P by using five genetic models in the studies. The transmission disequilibrium test (TDT) was conducted for family-based studies. Results Three case-control and three family-based studies were evaluated. Based on the analysis of five genetic models, risk of NSCL/P was not related to CBS c.844ins68 polymorphism in case-control studies. The results of family-based studies did not show any association between the CBS c.844ins68 allele and NSCL/P either. Conclusions The results of this meta-analysis showed that there was no association between CBS c.844ins68 polymorphism and risk of NSCL/P; therefore, this polymorphism does not play a role in susceptibility to NSCL/P.