title: C509T and T869C polymorphisms of transforming growth factor β1 and the risk of IgA nephropathy: a meta-analysis.
abstract: BACKGROUND
  IgA nephropathy (IgAN) is the most common primary glomerular disease. Transforming growth factor β1 (TGFβ1) plays an important role in pathogenesis of IgAN. Associations between the polymorphisms of TGFβ1 gene and the risk of IgAN remained inconsistent. A meta-analysis was conducted to investigate the association between polymorphisms in the TGFβ1 gene and IgAN susceptibility.
  
  
  METHODS
  Databases including Pubmed, EMBASE, ISI, et al. were searched to find relevant studies. Odds ratios (ORs) with 95% confidence intervals (CIs) were used to evaluate the strength of associations.
  
  
  RESULTS
  Ten studies involving 1770 cases and 1953 controls were included. Significant association between C509T polymorphism and IgAN risk was observed (OR 1.42, 95% CI 1.12-1.81, P = 0.0004; I(2) = 0%) in Caucasians by the overdominant model (CT vs. CC + TT), but no significant association was found (P = 0.200) in Asians by the dominant model (CC + CT vs. TT). Significant association between T869C polymorphism and IgAN susceptibility was found (OR 1.21, 95% CI 1.02-1.44, P = 0.030) in overall populations by the dominant model (TT + TC vs. CC). Subgroup analysis found T allele of T869C polymorphism was associated with IgAN susceptibility in Caucasians (P = 0.030), but not in Asians (P = 0.290).
  
  
  CONCLUSIONS
  Both heterozygotes of C509T polymorphism and T allele of T869C polymorphism in TGFβ1 were associated with the risk of IgAN in Caucasians, but not in Asians.
authors.affiliation: Department of Nephrology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai 200003, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Xue
authors.forename: Wei
authors.initials: W
authors.lastname: Nie
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Bing
authors.initials: B
authors.lastname: Dai
authors.forename: Chang-lin
authors.initials: CL
authors.lastname: Mei
mesh_terms: D044466:Asian People / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005922:Glomerulonephritis, IGA / Q000453:epidemiology* / Q000235:genetics*; D006801:Humans; D011110:Polymorphism, Genetic / Q000235:genetics; D053773:Transforming Growth Factor beta1 / Q000235:genetics*; D044465:White People / Q000235:genetics
chemical_list: D053773:Transforming Growth Factor beta1