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United States Department of Agriculture

Agricultural Research Service

Title: Apolipoprotein E Gene and Early Age-Related Maculopathy

Authors
item Wong, Tien - UNIV. OF MELBOURNE
item Shankar, Anoop - NAT UNIV OF SINGAPORE
item Klein, Ronald - UNIV OF WISCONSIN
item Bray, Molly
item Couper, David - UNIV N CAROLINA CHAPEL HI
item Klein, Barbara - UNIV OF WISCONSIN
item Sharrett, Richey - JOHN HOPKINS UNIV, BALTIM
item Folsom, Aaron - UNIV OF MINNESOTA

Submitted to: Trade Journal Publication
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: January 5, 2006
Publication Date: February 15, 2006
Citation: Wong, T.Y., Shankar, A., Klein, R., Bray, M.S., Couper, D.J., Klein, B.E.K., Sharrett, R.A., Folsom, A.R. 2006. Apolipoprotein E gene and early age-related maculopathy. Opthalmology. 114(2):255-259.

Interpretive Summary: We examined the association between DNA sequence variation in the apolipoprotein E (APOE) gene and early age-related maculopathy (ARM), a type of eye disease, in middle-aged persons. Participants in this study were from the Atherosclerosis Risk in Communities Study (n = 10139; age range, 49-73 years). Photography of the eye was performed on one randomly selected eye, and grading for presence of ARM was carried out using a modification of the Wisconsin ARM Grading System. The prevalence of early ARM was similar in participants with different forms of the APOE gene: epsilon2/epsilon2 (5.9%), epsilon2/epsilon3 (5.2%), epsilon2/epsilon4 (3.2%), epsilon3/epsilon3 (5.2%), epsilon3/epsilon4 (4.9%), and epsilon4/epsilon4 (4.1%). After controlling for age, gender, race, cigarette smoking, and other factors, early ARM was not associated with the APOE gene. In addition, no associations were found for specific early ARM signs or in analyses that were performed separately by age, gender, race, or cigarette smoking status.

Technical Abstract: OBJECTIVE: To examine the association between the apolipoprotein E (APOE) gene and early age-related maculopathy (ARM) in middle-aged persons. DESIGN: Population-based cross-sectional study. PARTICIPANTS: Participants from the Atherosclerosis Risk in Communities Study (n = 10139; age range, 49-73 years). METHODS: Retinal photography was performed on 1 randomly selected eye, and grading for presence of ARM was carried out using a modification of the Wisconsin ARM Grading System. Early ARM was defined as the presence of either soft drusen alone, retinal pigment epithelial depigmentation alone, or a combination of soft drusen with increased retinal pigment and/or depigmentation. DNA extracted from blood samples of participants were analyzed for common allelic variants of the APOE gene (epsilon2, epsilon3, and epsilon4). MAIN OUTCOME MEASURES: Presence of early ARM on retinal photographs. RESULTS: The prevalence of early ARM was similar in participants with different APOE genotypes: epsilon2/epsilon2 (5.9%), epsilon2/epsilon3 (5.2%), epsilon2/epsilon4 (3.2%), epsilon3/epsilon3 (5.2%), epsilon3/epsilon4 (4.9%), and epsilon4/epsilon4 (4.1%). After controlling for age, gender, race, cigarette smoking, and other factors, early ARM was not associated with APOE genotypes, with an odds ratio (OR) of 1.35 (95% confidence interval [CI], 0.54-3.38) for epsilon2/epsilon2 genotype, an OR of 1.06 (95% CI, 0.80-1.40) for epsilon2/epsilon3 genotype, an OR of 0.63 (95% CI, 0.32-1.24) for epsilon2/epsilon4 genotype, an OR of 0.99 (95% CI, 0.80-1.24) for epsilon3/epsilon4 genotype, and an OR of 0.88 (95% CI, 0.47-1.63) for epsilon4/epsilon4 genotype, as compared with epsilon3/epsilon3 genotype (reference). No associations were found for specific early ARM signs or in analyses stratified by age, gender, race, or cigarette smoking status. CONCLUSIONS: These data provide no evidence of a strong association between the APOE gene and early ARM in middle-aged persons. This suggests that APOE is not likely a major determinant of the early stages of ARM in younger people. However, our study does not exclude the possibility of a weaker association or that APOE may influence only the development of late ARM in older populations, as reported in other studies.

Last Modified: 7/28/2014
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