Exploring Factors Underlying Ethnic Difference in Age-related Macular Degeneration Prevalence.

Conference Paper

AIMS: To assess contributions of dietary and genetic factors to ethnic differences in AMD prevalence. DESIGN: Population-based analytical study. METHODS: In the Blue Mountains Eye Study, Australia (European ancestry n = 2826) and Multi-Ethnic Cohort Study, Singapore (Asian ancestry, n = 1900), AMD was assessed from retinal photographs. Patterns of dietary composition and scores of the Alternative Healthy Eating Index were computed using food frequency questionnaire data. Genetic susceptibility to AMD was determined using either single nucleotide polymorphisms (SNPs) of the complement factor H and age-related maculopathy susceptibility 2 genes, or combined odds-weighted genetic risk scores of 24 AMD-associated SNPs. Associations of AMD with ethnicity, diet, and genetics were assessed using logistic regression. Six potential mediators covering genetic, diet and lifestyle factors were assessed for their contributions to AMD risk difference between the two samples using mediation analyses. RESULTS: Age-standardized prevalence of any (early or late) AMD was higher in the European (16%) compared to Asian samples (9%, p < .01). Mean AMD-related genetic risk scores were also higher in European (33.3 ± 4.4) than Asian (Chinese) samples (31.7 ± 3.7, p < .001). In a model simultaneously adjusting for age, ethnicity, genetic susceptibility and Alternative Healthy Eating Index scores, only age and genetic susceptibility were significantly associated with AMD. Genetic risk scores contributed 19% of AMD risk difference between the two samples while intake of polyunsaturated fatty acids contributed 7.2%. CONCLUSION: Genetic susceptibility to AMD was higher in European compared to Chinese samples and explained more of the AMD risk difference between the two samples than the dietary factors investigated.

Full Text

Duke Authors

Cited Authors

  • Jones, M; Whitton, C; Tan, AG; Holliday, EG; Oldmeadow, C; Flood, VM; Sim, X; Chai, J-F; Hamzah, H; Klein, R; Teo, Y-Y; Mitchell, P; Wong, TY; Tai, ES; Van Dam, RM; Attia, J; Wang, JJ

Published Date

  • October 2020

Published In

Volume / Issue

  • 27 / 5

Start / End Page

  • 399 - 408

PubMed ID

  • 32511069

Electronic International Standard Serial Number (EISSN)

  • 1744-5086

Digital Object Identifier (DOI)

  • 10.1080/09286586.2020.1762229

Conference Location

  • England