Multifactor effects and evidence of potential interaction between complement factor H Y402H and LOC387715 A69S in age-related macular degeneration

Sanna P Seitsonen, Päivi Onkamo, Gang Peng, Momiao Xiong, Petri V Tommila, Päivi H Ranta, Juha M Holopainen, Jukka A Moilanen, Tapani Palosaari, Kai Kaarniranta, Seppo Meri, Ilkka R Immonen, Irma E Järvelä, Sanna P Seitsonen, Päivi Onkamo, Gang Peng, Momiao Xiong, Petri V Tommila, Päivi H Ranta, Juha M Holopainen, Jukka A Moilanen, Tapani Palosaari, Kai Kaarniranta, Seppo Meri, Ilkka R Immonen, Irma E Järvelä

Abstract

Background: Variants in the complement cascade genes and the LOC387715/HTRA1, have been widely reported to associate with age-related macular degeneration (AMD), the most common cause of visual impairment in industrialized countries.

Methods/principal findings: We investigated the association between the LOC387715 A69S and complement component C3 R102G risk alleles in the Finnish case-control material and found a significant association with both variants (OR 2.98, p = 3.75 x 10(-9); non-AMD controls and OR 2.79, p = 2.78 x 10(-19), blood donor controls and OR 1.83, p = 0.008; non-AMD controls and OR 1.39, p = 0.039; blood donor controls), respectively. Previously, we have shown a strong association between complement factor H (CFH) Y402H and AMD in the Finnish population. A carrier of at least one risk allele in each of the three susceptibility loci (LOC387715, C3, CFH) had an 18-fold risk of AMD when compared to a non-carrier homozygote in all three loci. A tentative gene-gene interaction between the two major AMD-associated loci, LOC387715 and CFH, was found in this study using a multiplicative (logistic regression) model, a synergy index (departure-from-additivity model) and the mutual information method (MI), suggesting that a common causative pathway may exist for these genes. Smoking (ever vs. never) exerted an extra risk for AMD, but somewhat surprisingly, only in connection with other factors such as sex and the C3 genotype. Population attributable risks (PAR) for the CFH, LOC387715 and C3 variants were 58.2%, 51.4% and 5.8%, respectively, the summary PAR for the three variants being 65.4%.

Conclusions/significance: Evidence for gene-gene interaction between two major AMD associated loci CFH and LOC387715 was obtained using three methods, logistic regression, a synergy index and the mutual information (MI) index.

Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1. Measures of biological interactions between…
Figure 1. Measures of biological interactions between LOC387715 A69S (LOC) and CFH Y402H (CFH).
Regression coefficients for the calculations of the estimates were obtained from a separate logistic regression model as described by Andersson et al., 2005 www.epinet.se. Figures in parenthesis after measures indicates values with no interaction.

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