title: Association between MTHFR C677T and A1298C polymorphisms and NSCL/P risk in Asians: a meta-analysis.
abstract: OBJECTIVE
  Several studies have reported the association between methylenetetrahydrofolate reductase (MTHFR) C677T and A1298C polymorphisms and nonsyndromic cleft lip with or without palate (NSCL/P) in Asian populations. However, findings have been conflicting. In order to investigate the association, a meta-analysis was performed.
  
  
  METHODS
  We searched Pubmed, MedLine and EmBase database to selected eligible studies. The pooled odds ratios (ORs) with 95% confidence intervals (95%CIs) were calculated using fixed effects model or random effects model to assess the association between MTHFR polymorphisms and NSCL/P in both Asian children and mothers.
  
  
  RESULTS
  Finally, nine case-control studies were included. Overall, the MTHFR C677T polymorphism and NSCL/P showed pooled ORs (95%CI) of 1.41(1.23-1.61) in Asian children, and 1.70(1.19-2.42) in Asian mothers. Subgroup analyses by geographical locations further identified the association in Eastern Asian children, Western/Central Asian children and mothers, but not in Eastern Asian mothers. However, no significant relationship between MTHFR A1298C polymorphism and NSCL/P was found in this meta-analysis.
  
  
  CONCLUSIONS
  The MTHFR 677T allele was associated with an increased risk of NSCL/P in Asian populations.
authors.affiliation: Department of Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning Province, China; Key Laboratory of Cancer Etiology and Intervention, University of Liaoning Province, Shenyang, China.
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Zhao
authors.affiliation: Department of Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning Province, China; Key Laboratory of Cancer Etiology and Intervention, University of Liaoning Province, Shenyang, China.
authors.forename: Yangwu
authors.initials: Y
authors.lastname: Ren
authors.affiliation: Department of Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning Province, China; Key Laboratory of Cancer Etiology and Intervention, University of Liaoning Province, Shenyang, China.
authors.forename: Li
authors.initials: L
authors.lastname: Shen
authors.affiliation: Department of Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning Province, China; Key Laboratory of Cancer Etiology and Intervention, University of Liaoning Province, Shenyang, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning Province, China; Key Laboratory of Cancer Etiology and Intervention, University of Liaoning Province, Shenyang, China.
authors.forename: Baosen
authors.initials: B
authors.lastname: Zhou
mesh_terms: D044466:Asian People; D001921:Brain / Q000002:abnormalities*; D016022:Case-Control Studies; D002648:Child; D002971:Cleft Lip / Q000235:genetics*; D002972:Cleft Palate / Q000235:genetics*; D005260:Female; D006801:Humans; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D011110:Polymorphism, Genetic
chemical_list: C573423:MTHFR protein, human; D042965:Methylenetetrahydrofolate Reductase (NADPH2)