TY - JOUR
T1 - Apolipoprotein e gene associations in age-related macular degeneration
AU - Adams, Madeleine
AU - Simpson, Julie Anne
AU - Richardson, Andrea J
AU - English, Dallas R
AU - Aung, Khin Zaw
AU - Makeyeva, Galina A
AU - Guymer, Robyn Heather
AU - Giles, Graham G
AU - Hopper, John L
AU - Robman, Liubov
AU - Baird, Paul N
PY - 2012
Y1 - 2012
N2 - The apolipoprotein E gene (APOE) has been found to be associated with age-related macular degeneration (AMD). Reported associations have been questioned, as they are opposite those for Alzheimer s disease and cardiovascular disease. The authors examined associations between APOE genotype and AMD using a case-control study (2,287 cases and 2,287 controls individually matched on age, sex, and country of origin) nested within Melbourne Collaborative Cohort Study participants aged 48-86 years at AMD detection. The odds ratio for early AMD among participants with e2-containing genotypes (e2e2/e2e3/e2e4) was 1.32 (95 confidence interval (CI): 1.11, 1.58; P = 0.002) versus persons with genotype e3e3. Associations with early AMD varied by smoking status; e2-containing genotypes were positively associated with early AMD for never and previous smokers (never smokers: odds ratio (OR) = 1.40, 95 CI: 1.12, 1.76 (P = 0.003); previous smokers: OR = 1.39, 95 CI: 1.00, 1.93 (P = 0.05)) but not for current smokers (OR = 0.66, 95 CI: 0.34, 1.30 (P = 0.2; interaction P = 0.05). The e4-containing genotype group (e3e4/e4e4) had an inverse association with early AMD among current smokers only (OR = 0.41, 95 CI: 0.22, 0.77 (P = 0.005)). These results highlight the importance of stratifying by smoking status in elderly populations. Smokers who survive to old age may be more likely to possess unknown genotypes which modify exposure-disease associations.
AB - The apolipoprotein E gene (APOE) has been found to be associated with age-related macular degeneration (AMD). Reported associations have been questioned, as they are opposite those for Alzheimer s disease and cardiovascular disease. The authors examined associations between APOE genotype and AMD using a case-control study (2,287 cases and 2,287 controls individually matched on age, sex, and country of origin) nested within Melbourne Collaborative Cohort Study participants aged 48-86 years at AMD detection. The odds ratio for early AMD among participants with e2-containing genotypes (e2e2/e2e3/e2e4) was 1.32 (95 confidence interval (CI): 1.11, 1.58; P = 0.002) versus persons with genotype e3e3. Associations with early AMD varied by smoking status; e2-containing genotypes were positively associated with early AMD for never and previous smokers (never smokers: odds ratio (OR) = 1.40, 95 CI: 1.12, 1.76 (P = 0.003); previous smokers: OR = 1.39, 95 CI: 1.00, 1.93 (P = 0.05)) but not for current smokers (OR = 0.66, 95 CI: 0.34, 1.30 (P = 0.2; interaction P = 0.05). The e4-containing genotype group (e3e4/e4e4) had an inverse association with early AMD among current smokers only (OR = 0.41, 95 CI: 0.22, 0.77 (P = 0.005)). These results highlight the importance of stratifying by smoking status in elderly populations. Smokers who survive to old age may be more likely to possess unknown genotypes which modify exposure-disease associations.
UR - http://aje.oxfordjournals.org.ezproxy.lib.monash.edu.au/content/175/6/511.full.pdf+html
U2 - 10.1093/aje/kwr329
DO - 10.1093/aje/kwr329
M3 - Article
SN - 0002-9262
VL - 175
SP - 511
EP - 518
JO - American Journal of Epidemiology
JF - American Journal of Epidemiology
IS - 6
ER -
