title: Complement factor H Y402H variant and risk of age-related macular degeneration in Asians: a systematic review and meta-analysis.
abstract: OBJECTIVE
  To investigate whether the Y402H variant in the complement factor H gene is associated with age-related macular degeneration (AMD) in Asian populations.
  
  
  METHODS
  Meta-analysis of previous publications.
  
  
  METHODS
  Case-control groups of subjects with AMD and controls from 13 association studies.
  
  
  METHODS
  We performed a meta-analysis of the association between Y402H and AMD in Asian populations using data available from 13 case-control studies involving 3973 subjects. Summary odds ratios (ORs) and 95% confidence intervals (CIs) were estimated using fixed- and random-effects models. The Q-statistic test was used to assess heterogeneity, and Egger's test was used to evaluate publication bias. Sensitivity analysis, cumulative meta-analysis, and meta-regression analysis were also performed.
  
  
  METHODS
  Allele and genotype frequencies of the Y402H variant.
  
  
  RESULTS
  The Y402H variant showed a significant summary OR of 1.97 (95% CI, 1.54-2.52; P<0.001; allelic contrast model) per allele. Possession of at least 1 copy of the C allele increased the disease risk by 1.97-fold (95% CI, 1.63-2.39; P<0.001; dominant model) and accounted for 8.8% of the attributable risk of AMD in Asian populations. Sensitivity analysis indicated the robustness of our findings, and evidence of publication bias was not observed in our meta-analysis. Meta-regression analysis indicated no significant effect of baseline study characteristics on the summary effect size. Cumulative meta-analysis revealed that the summary ORs were stable and the 95% CIs narrowed with the accumulation of data over time.
  
  
  CONCLUSIONS
  Our analysis provides substantial evidence that the Y402H variant is significantly associated with AMD in Asian populations. Our results expand the number of confirmed AMD susceptibility loci for Asians populations, which provide a better understanding of the genetic architecture underlying disease susceptibility and may advance the potential for preclinical prediction in future genetic tests by a combined evaluation of inherited susceptibility with previously established loci.
authors.affiliation: Department of Surgery, Division of Ophthalmology, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Japan. nskondo@gmail.com
authors.forename: Naoshi
authors.initials: N
authors.lastname: Kondo
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Bessho
authors.forename: Shigeru
authors.initials: S
authors.lastname: Honda
authors.forename: Akira
authors.initials: A
authors.lastname: Negi
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000235:genetics*; D016022:Case-Control Studies; D002681:China; D017242:Complement Factor H / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D007564:Japan; D007723:Korea; D008268:Macular Degeneration / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D012307:Risk Factors
chemical_list: C493495:CFH protein, human; D017242:Complement Factor H