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Apolipoprotein E gene and early age-related maculopathy: the Atherosclerosis Risk in Communities Study.

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.

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  • Authors+Show Affiliations

    ,

    Centre for Eye Research Australia, University of Melbourne, Melbourne, Victoria, Australia. twong@unimelb.edu.au

    , , , , , ,

    Source

    Ophthalmology 113:2 2006 Feb pg 255-9

    MeSH

    Aged
    Apolipoproteins E
    Cross-Sectional Studies
    Female
    Genetic Predisposition to Disease
    Genotype
    Humans
    Macular Degeneration
    Male
    Middle Aged
    Photography
    Prevalence
    Risk Factors

    Pub Type(s)

    Journal Article
    Multicenter Study
    Research Support, N.I.H., Extramural
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    16406547

    Citation

    Wong, Tien Yin, et al. "Apolipoprotein E Gene and Early Age-related Maculopathy: the Atherosclerosis Risk in Communities Study." Ophthalmology, vol. 113, no. 2, 2006, pp. 255-9.
    Wong TY, Shankar A, Klein R, et al. Apolipoprotein E gene and early age-related maculopathy: the Atherosclerosis Risk in Communities Study. Ophthalmology. 2006;113(2):255-9.
    Wong, T. Y., Shankar, A., Klein, R., Bray, M. S., Couper, D. J., Klein, B. E., ... Folsom, A. R. (2006). Apolipoprotein E gene and early age-related maculopathy: the Atherosclerosis Risk in Communities Study. Ophthalmology, 113(2), pp. 255-9.
    Wong TY, et al. Apolipoprotein E Gene and Early Age-related Maculopathy: the Atherosclerosis Risk in Communities Study. Ophthalmology. 2006;113(2):255-9. PubMed PMID: 16406547.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Apolipoprotein E gene and early age-related maculopathy: the Atherosclerosis Risk in Communities Study. AU - Wong,Tien Yin, AU - Shankar,Anoop, AU - Klein,Ronald, AU - Bray,Molly S, AU - Couper,David J, AU - Klein,Barbara E K, AU - Sharrett,A Richey, AU - Folsom,Aaron R, Y1 - 2006/01/10/ PY - 2005/05/24/received PY - 2005/09/30/revised PY - 2005/10/05/accepted PY - 2006/1/13/pubmed PY - 2006/2/16/medline PY - 2006/1/13/entrez SP - 255 EP - 9 JF - Ophthalmology JO - Ophthalmology VL - 113 IS - 2 N2 - 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. SN - 1549-4713 UR - https://www.unboundmedicine.com/medline/citation/16406547/Apolipoprotein_E_gene_and_early_age_related_maculopathy:_the_Atherosclerosis_Risk_in_Communities_Study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0161-6420(05)01300-X DB - PRIME DP - Unbound Medicine ER -