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Complement Factor H Polymorphism, Complement Activators, and Risk of Age-Related Macular Degeneration
Dominiek D. G. Despriet, MD;
Caroline C. W. Klaver, MD, PhD;
Jacqueline C. M. Witteman, PhD;
Arthur A. B. Bergen, PhD;
Isabella Kardys, MD;
Moniek P. M. de Maat, PhD;
Sharmila S. Boekhoorn, MD;
Johannes R. Vingerling, MD, PhD;
Albert Hofman, MD, PhD;
Ben A. Oostra, PhD;
André G. Uitterlinden, PhD;
Theo Stijnen, PhD;
Cornelia M. van Duijn, PhD;
Paulus T. V. M. de Jong, MD, PhD
JAMA. 2006;296:301-309.
Context The evidence that inflammation is an important pathway in age-related macular degeneration (AMD) is growing. Recent case-control studies demonstrated an association between the complement factor H (CFH) gene, a regulator of complement, and AMD.
Objectives To assess the associations between the CFH gene and AMD in the general population and to investigate the modifying effect of smoking, serum inflammatory markers, and genetic variation of C-reactive protein (CRP).
Design, Setting, and Participants Population-based, prospective cohort study of individuals aged 55 years or older (enrollment between March 20, 1990, and July 31, 1993, and 3 follow-up examinations that were performed between September 1, 1993, and December 31, 2004) in Rotterdam, the Netherlands. The CFH Y402H polymorphism was determined in a total of 5681 individuals. Information on smoking, erythrocyte sedimentation rate, CRP serum levels, and haplotypes of the CRP gene were assessed at baseline.
Main Outcome Measures All severity stages of prevalent and incident AMD, graded according to the international classification and grading system for AMD.
Results The frequency of CFH Y402H was 36.2% (4116/11 362 alleles). At baseline, there were 2062 persons (36.3%) with any type of AMD (prevalent cases), including 78 (1.4%) with late AMD (stage 4). During follow-up (mean, 8 years; median, 10 years), 1649 (35.5%) of 4642 participants progressed to a higher stage of AMD (incident cases), including 93 (5.6%) who developed late AMD. The odds ratio (OR) of AMD increased in an allele-dose manner with 2.00 (95% confidence interval [CI], 1.56-2.55) for stage 2 AMD, 4.58 (95% CI, 2.82-7.44) for stage 3 AMD, and 11.02 (95% CI, 6.82-11.81) for stage 4 (late, vision threatening) AMD for homozygous persons. Cumulative risks calculated by Kaplan-Meier analysis of late AMD by age 95 years were 48.3% for homozygotes, 42.6% for heterozygotes, and 21.9% for noncarriers. The population-attributable risk for CFH Y402H was 54.0%. Elevated erythrocyte sedimentation rates further increased the OR to 20.2 (95% CI, 9.5-43.0), elevated serum CRP levels to 27.7 (95% CI, 10.7-72.0), and smoking to 34.0 (95% CI, 13.0-88.6) for homozygotes compared with noncarriers without these determinants. The CRP haplotypes conferring high levels of CRP significantly increased the effect of CFH Y402H (P<.01).
Conclusions The CFH Y402H polymorphism may account for a substantial proportion of AMD in individuals similar to those in the Rotterdam Study and may confer particular risk in the presence of environmental and genetic stimulators of the complement cascade.
Author Affiliations: Departments of Epidemiology and Biostatistics (Drs Despriet, Klaver, Witteman, Kardys, Boekhoorn, Vingerling, Hofman, Uitterlinden, Stijnen, Van Duijn, and De Jong), Ophthalmology (Drs Despriet, Klaver, and Vingerling), Hematology (Dr De Maat), Clinical Genetics (Dr Oostra), and Internal Medicine (Dr Uitterlinden), Erasmus Medical Center, Rotterdam, the Netherlands; and the Department of Molecular and Clinical Ophthalmogenetics, the Netherlands Institute for Neuroscience, Amsterdam, the Netherlands (Drs Despriet, Klaver, Bergen, and De Jong); and the Departments of Clinical Genetics (Dr Bergen) and Ophthalmology (Dr De Jong), Academic Medical Centre, Amsterdam, the Netherlands.
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