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Age-related maculopathy (ARM) is a multifactorial disorder known to have a substantial genetic component. The epsilon4 allele of the apolipoprotein E gene (APOE-4) has previously been reported to have a protective effect on ARM risk, while the APOE-2 allele may increase disease risk. This study combined four independent data sets (three US and one European) of Caucasian ARM patients and controls in order to obtain better statistical power to examine the role of APOE in ARM. APOE genotype and allele frequencies were compared for 617 ARM cases and 1260 controls, adjusting for age and sex differences between the two groups via multiple logistic regression. The protective effect of the APOE-4 allele on ARM risk was confirmed (age- and sex-adjusted odds ratio (OR) for APOE-4 carriers 0.54, 95% confidence interval (CI) 0.41-0.70, p < 0.0001). The effect of APOE-4 did not differ significantly between males and females and was observed consistently for both atrophic and neovascular ARM. Evidence for an increased risk of ARM due to the APOE-2 allele was found for men, but not for women (OR for men 1.54, 95% CI 0.97-2.45; OR for women 0.74, 95% CI 0.52-1.06, p = 0.01 for interaction of sex and APOE-2 carrier status). These data confirm that the APOE-4 allele, or an allele in linkage disequilibrium with it, reduces the risk of ARM. They also suggest that the effect of the APOE-2 allele may vary by gender, and that APOE-2 may confer an increased risk only to males.

Original publication

DOI

10.1076/opge.23.4.209.13883

Type

Journal article

Journal

Ophthalmic genetics

Publication Date

12/2002

Volume

23

Pages

209 - 223

Addresses

Center for Human Genetics, Department of Medicine, Duke University Medical Center, Durham, NC, USA.

Keywords

Humans, Macular Degeneration, Genetic Predisposition to Disease, Apolipoproteins E, Risk Factors, Case-Control Studies, Age Distribution, Genotype, Aged, Aged, 80 and over, Middle Aged, Female, Male, Apolipoprotein E2, Apolipoprotein E3, Apolipoprotein E4