Association of CFH Y402H and LOC387715 A69S with progression of age-related macular degeneration.
BACKGROUND
Studies have reported that single-nucleotide polymorphisms in the genes CFH and LOC387715 are associated with age-related macular degeneration (AMD).


OBJECTIVE
To assess whether these genetic variants have prognostic importance for progression to advanced AMD and related visual loss.


METHODS
Prospective analysis of 1466 white participants in the Age-Related Eye Disease Study (AREDS), a US multicenter clinical trial conducted from 1990 to 2001 with a mean follow-up time of 6.3 years. Age-related macular degeneration status was determined by grading of fundus photographs. Progression (n = 281) was defined as newly diagnosed advanced AMD (geographic atrophy, exudative disease, or AMD causing visual loss) in one or both eyes during the course of the study. Genotypic analysis was conducted in 2006.


METHODS
Incidence rates of dry and neovascular advanced AMD.


RESULTS
The CFH Y402H and LOC387115 A69S polymorphisms were each independently related to progression from early or intermediate stages to advanced stages of AMD, controlling for demographic factors, smoking, body mass index, and AREDS vitamin-mineral treatment assignment, with odds ratios (ORs) of 2.6 (95% confidence interval [CI], 1.7-3.9) for CFH and 4.1 (95% CI, 2.7-6.3) for LOC387715 for the homozygous risk genotypes (P<.001 for trend for each additional risk allele for both genes). The effect of LOC387715 was stronger for progression to neovascular disease (OR, 6.1; 95% CI, 3.3-11.2) compared with geographic atrophy (OR, 3.0; 95% CI, 1.4-6.5) relative to no progression for the homozygous risk state. The presence of all adverse factors (both risk genotypes, smoking, and body mass index > or =25) increased risk 19-fold. Smoking and high body mass index increased odds of progression within each risk genotype. Genetic plus nongenetic risk scores provided an area under the receiver operating characteristic curve of up to 0.78.


CONCLUSIONS
Common polymorphisms in the genes CFH and LOC387715 are independently related to AMD progression after adjustment for other known AMD risk factors. Presence of these polymorphisms plus smoking [corrected] and body mass index of 25 or higher, controlling for AREDS vitamin-mineral treatment, identifies [corrected] patients who are highly susceptible to developing advanced states [corrected] of this visually disabling disease.
Seddon
Johanna M
JM
Ophthalmic Epidemiology and Genetics Service, Department of Ophthalmology, Tufts-New England Medical Center, Boston, MA 02111, USA. jseddon@earthlink.net
Francis
Peter J
PJ
George
Sarah
S
Schultz
Dennis W
DW
Rosner
Bernard
B
Klein
Michael L
ML
D000328:Adult; D000368:Aged; D017242:Complement Factor H / Q000235:genetics; D018450:Disease Progression; D005260:Female; D005838:Genotype; D006801:Humans; D008268:Macular Degeneration / Q000175:diagnosis / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011446:Prospective Studies; D011506:Proteins / Q000235:genetics*; D012307:Risk Factors; D044465:White People
C514392:ARMS2 protein, human; C493495:CFH protein, human; D011506:Proteins; D017242:Complement Factor H