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Apolipoprotein E gene and retinal microvascular signs in older people: the Cardiovascular Health Study.
Mol Vis. 2007 Nov 12; 13:2105-11.MV

Abstract

PURPOSE

To examine the association between apolipoprotein E (APOE) gene polymorphism and retinal microvascular signs in an older population.

METHODS

Retinal photographs were taken of 2,152 participants (1,831 whites, and 321 African-Americans), aged 69-96 years, who were participating in a population-based study of four United States communities. We used standardized protocols to assess photographs for the presence of retinal microvascular signs (retinopathy, arterio-venous nicking, and focal arteriolar narrowing) and a computer-assisted method to measure retinal vessel diameters. We analyzed DNA extracted from blood samples of participants for common allelic variants of the APOE gene.

RESULTS

After adjusting for age, gender, systolic blood pressure, smoking, total serum cholesterol, and other risk factors, we found white participants carrying the epsilon2 and epsilon4 alleles were more likely to have arterio-venous nicking than the epsilon3/epsilon3 homozygotes, with odds ratio (OR) of 1.70 and confidence interval (CI) 95% (1.03-2.83) for the epsilon2 carriers and OR 1.74 (95% CI 1.06-2.84) for the epsilon4 carriers. Among white participants without hypertension, the associations remained significant for the epsilon4 carriers (OR 2.32, 95% CI 1.18-4.57). Whites, normotensive carriers of the epsilon2 allele had significantly narrower retinal arteriolar diameters (adjusted mean arteriolar diameter of 163.5 mum, 95% CI 160.1-167.0, p=0.03) compared to the epsilon3/epsilon3 homozygotes (167.8 mum, 95% CI 166.0-169.6). APOE gene polymorphism was not associated with retinopathy, focal narrowing, or retinal venular diameters in white participants. There were insufficient numbers of African-Americans for separate multivariate analysis.

CONCLUSIONS

This study provides little evidence that the APOE gene polymorphism plays a significant role in the pathogenesis of retinal microvascular changes in the general population. In the older white population, APOE epsilon2 and epsilon4 allele carriers were more likely to have arterio-venous nicking. Other retinal signs, however, were not related to APOE gene polymorphism.

Authors+Show Affiliations

Centre for Eye Research Australia, University of Melbourne, VIC, Australia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

18079687

Citation

Sun, Cong, et al. "Apolipoprotein E Gene and Retinal Microvascular Signs in Older People: the Cardiovascular Health Study." Molecular Vision, vol. 13, 2007, pp. 2105-11.
Sun C, Tikellis G, Liew G, et al. Apolipoprotein E gene and retinal microvascular signs in older people: the Cardiovascular Health Study. Mol Vis. 2007;13:2105-11.
Sun, C., Tikellis, G., Liew, G., Klein, R., Larsen, E. K., & Wong, T. Y. (2007). Apolipoprotein E gene and retinal microvascular signs in older people: the Cardiovascular Health Study. Molecular Vision, 13, 2105-11.
Sun C, et al. Apolipoprotein E Gene and Retinal Microvascular Signs in Older People: the Cardiovascular Health Study. Mol Vis. 2007 Nov 12;13:2105-11. PubMed PMID: 18079687.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Apolipoprotein E gene and retinal microvascular signs in older people: the Cardiovascular Health Study. AU - Sun,Cong, AU - Tikellis,Gabriella, AU - Liew,Gerald, AU - Klein,Ronald, AU - Larsen,Emily K Marino, AU - Wong,Tien Y, Y1 - 2007/11/12/ PY - 2006/12/18/received PY - 2007/10/30/accepted PY - 2007/12/15/pubmed PY - 2008/1/30/medline PY - 2007/12/15/entrez SP - 2105 EP - 11 JF - Molecular vision JO - Mol Vis VL - 13 N2 - PURPOSE: To examine the association between apolipoprotein E (APOE) gene polymorphism and retinal microvascular signs in an older population. METHODS: Retinal photographs were taken of 2,152 participants (1,831 whites, and 321 African-Americans), aged 69-96 years, who were participating in a population-based study of four United States communities. We used standardized protocols to assess photographs for the presence of retinal microvascular signs (retinopathy, arterio-venous nicking, and focal arteriolar narrowing) and a computer-assisted method to measure retinal vessel diameters. We analyzed DNA extracted from blood samples of participants for common allelic variants of the APOE gene. RESULTS: After adjusting for age, gender, systolic blood pressure, smoking, total serum cholesterol, and other risk factors, we found white participants carrying the epsilon2 and epsilon4 alleles were more likely to have arterio-venous nicking than the epsilon3/epsilon3 homozygotes, with odds ratio (OR) of 1.70 and confidence interval (CI) 95% (1.03-2.83) for the epsilon2 carriers and OR 1.74 (95% CI 1.06-2.84) for the epsilon4 carriers. Among white participants without hypertension, the associations remained significant for the epsilon4 carriers (OR 2.32, 95% CI 1.18-4.57). Whites, normotensive carriers of the epsilon2 allele had significantly narrower retinal arteriolar diameters (adjusted mean arteriolar diameter of 163.5 mum, 95% CI 160.1-167.0, p=0.03) compared to the epsilon3/epsilon3 homozygotes (167.8 mum, 95% CI 166.0-169.6). APOE gene polymorphism was not associated with retinopathy, focal narrowing, or retinal venular diameters in white participants. There were insufficient numbers of African-Americans for separate multivariate analysis. CONCLUSIONS: This study provides little evidence that the APOE gene polymorphism plays a significant role in the pathogenesis of retinal microvascular changes in the general population. In the older white population, APOE epsilon2 and epsilon4 allele carriers were more likely to have arterio-venous nicking. Other retinal signs, however, were not related to APOE gene polymorphism. SN - 1090-0535 UR - https://www.unboundmedicine.com/medline/citation/18079687/Apolipoprotein_E_gene_and_retinal_microvascular_signs_in_older_people:_the_Cardiovascular_Health_Study_ L2 - https://medlineplus.gov/retinaldisorders.html DB - PRIME DP - Unbound Medicine ER -