Abstract:
PURPOSE:Genome-wide association studies and targeted sequencing studies of candidate genes have identified common and rare variants that are associated with age-related macular degeneration (AMD). Whole-exome sequencing (WES) studies allow a more comprehensive analysis of rare coding variants across all genes of the genome and will contribute to a better understanding of the underlying disease mechanisms. To date, the number of WES studies in AMD case-control cohorts remains scarce and sample sizes are limited. To scrutinize the role of rare protein-altering variants in AMD cause, we performed the largest WES study in AMD to date in a large European cohort consisting of 1125 AMD patients and 1361 control participants. DESIGN:Genome-wide case-control association study of WES data. PARTICIPANTS:One thousand one hundred twenty-five AMD patients and 1361 control participants. METHODS:A single variant association test of WES data was performed to detect variants that are associated individually with AMD. The cumulative effect of multiple rare variants with 1 gene was analyzed using a gene-based CMC burden test. Immunohistochemistry was performed to determine the localization of the Col8a1 protein in mouse eyes. MAIN OUTCOME MEASURES:Genetic variants associated with AMD. RESULTS:We detected significantly more rare protein-altering variants in the COL8A1 gene in patients (22/2250 alleles [1.0%]) than in control participants (11/2722 alleles [0.4%]; P = 7.07×10-5). The association of rare variants in the COL8A1 gene is independent of the common intergenic variant (rs140647181) near the COL8A1 gene previously associated with AMD. We demonstrated that the Col8a1 protein localizes at Bruch's membrane. CONCLUSIONS:This study supported a role for protein-altering variants in the COL8A1 gene in AMD pathogenesis. We demonstrated the presence of Col8a1 in Bruch's membrane, further supporting the role of COL8A1 variants in AMD pathogenesis. Protein-altering variants in COL8A1 may alter the integrity of Bruch's membrane, contributing to the accumulation of drusen and the development of AMD.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Corominas J,Colijn JM,Geerlings MJ,Pauper M,Bakker B,Amin N,Lores Motta L,Kersten E,Garanto A,Verlouw JAM,van Rooij JGJ,Kraaij R,de Jong PTVM,Hofman A,Vingerling JR,Schick T,Fauser S,de Jong EK,van Duijn CM,Hoyng CBdoi
10.1016/j.ophtha.2018.03.040subject
Has Abstractpub_date
2018-09-01 00:00:00pages
1433-1443issue
9eissn
0161-6420issn
1549-4713pii
S0161-6420(17)33149-4journal_volume
125pub_type
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