Protective effect of complement factor B and complement component 2 variants in age-related macular degeneration.

Journal Article

Age-related macular degeneration (AMD) is a devastating disorder of the central retina, causing significant visual impairment for 7.5 million elderly Americans. Abnormal regulation of the complement system likely caused by the Y402H polymorphism in the complement factor H gene is a recognized risk factor for AMD, as is the A69S variant in the poorly characterized LOC387715 gene. Recently, polymorphisms in the factor B (CFB) and complement component 2 (CC2) genes were associated with decreased susceptibility to AMD. To validate this association in independent family-based and case-control Caucasian data sets, we genotyped two single-nucleotide polymorphisms (SNPs) in CC2 and four SNPs in CFB. The R32Q variant of CFB was significantly associated with protection from AMD in the family-based data set (P = 0.025). Three SNPs in CC2 and CFB were strongly associated with decreased risk of AMD in the case-control data set (CC2 E318D: P = 0.02; CC2 rs547154: P = 9 x 10(-6); and CFB R32Q P = 2 x 10(-5)). The minor alleles at CC2 rs547154 and CFB R32Q are present in 4% of cases versus 10% of controls, and as these SNPs are in strong linkage disequilibrium (r(2)=0.92), these results likely represent the same protective signal. After controlling for age, Y402H, A69S and smoking, the effect of CFB R32Q remained quite strong (OR 0.21, 95% confidence interval 0.11-0.39; P < 10(-4)). Likelihood ratio testing and conditional analyses in the case-control data set suggest that a weaker, independent protective effect exists for CC2 E318D.

Full Text

Duke Authors

Cited Authors

  • Spencer, KL; Hauser, MA; Olson, LM; Schmidt, S; Scott, WK; Gallins, P; Agarwal, A; Postel, EA; Pericak-Vance, MA; Haines, JL

Published Date

  • August 15, 2007

Published In

Volume / Issue

  • 16 / 16

Start / End Page

  • 1986 - 1992

PubMed ID

  • 17576744

International Standard Serial Number (ISSN)

  • 0964-6906

Digital Object Identifier (DOI)

  • 10.1093/hmg/ddm146

Language

  • eng

Conference Location

  • England