Human Molecular Genetics Advance Access originally published online on June 25, 2007
Human Molecular Genetics 2007 16(17):2135-2148; doi:10.1093/hmg/ddm164
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Complement factor H and hemicentin-1 in age-related macular degeneration and renal phenotypes
1 Department of Epidemiology and Biostatistics, 2 Department of Genetics and 3 Department of Ophthalmology, Case Western Reserve University, Wolstein Research Building, Room 1315, 2103 Cornell Road, Cleveland, OH 44106, USA and 4 Department of Ophthalmology and Visual Sciences, University of Wisconsin Medical School, Madison, WI 53706, USA
* To whom correspondence should be addressed. Tel: +1 2163685630; Fax: +1 2163684880; Email: ski{at}case.edu
Received May 6, 2007; Accepted June 21, 2007
In this study, we investigated the associations of complement factor H (CFH) and hemicentin-1 (HMCN1) with age-related macular degeneration (AMD) and renal function. Three scales, measuring the course of AMD and drusen development, were examined in two samples: the Family Age-Related Macular degeneration Study (FARMS), consisting of families ascertained through a single individual with severe AMD, and an unascertained population-based family cohort, the Beaver Dam Eye Study (BDES), which was also used to assess longitudinal changes in AMD and associations with renal function. Associations were performed by a regression accounting for known risk factors as well as familial and sibling effects. Strong evidence of the association of rs1061170 (Y402H) variation with AMD was confirmed (P = 9.15 x 10–5 in BDES, P = 0.016 in FARMS). This association was observed in multiple AMD scales, suggesting that its role is not phenotype-specific. Polymorphisms in both CFH and HMCN1 appeared to influence the longitudinal rate of change of AMD. The rs1061170 polymorphism was also associated with a reduction in estimated glomerular filtration rate (eGFR) (P = 0.046). Another CFH polymorphism, rs800292, was similarly associated with eGFR [ß = –0.90 (P = 0.022)]. Associations between rs743137 (P = 0.05) and rs680638 (P = 0.022) in HMCN1 with calculated creatinine clearance progression were also observed. Both genes appear to play a role in both AMD and renal pathophysiology. These findings support evidence for common pathways influencing ocular and renal function and suggest that further work is required on their common determinants.