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GWAS-by-subtraction reveals an IOP-independent component of primary open angle glaucoma
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GWAS-by-subtraction reveals an IOP-independent component of primary open angle glaucoma
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Journal Article
GWAS-by-subtraction reveals an IOP-independent component of primary open angle glaucoma
2024
Overview
The etiology of primary open angle glaucoma is constituted by both intraocular pressure-dependent and intraocular pressure-independent mechanisms. However, GWASs of traits affecting primary open angle glaucoma through mechanisms independent of intraocular pressure remains limited. Here, we address this gap by subtracting the genetic effects of a GWAS for intraocular pressure from a GWAS for primary open angle glaucoma to reveal the genetic contribution to primary open angle glaucoma via intraocular pressure-independent mechanisms. Seventeen independent genome-wide significant SNPs were associated with the intraocular pressure-independent component of primary open angle glaucoma. Of these, 7 are located outside known normal tension glaucoma loci, 11 are located outside known intraocular pressure loci, and 2 are novel primary open angle glaucoma loci. The intraocular pressure-independent genetic component of primary open angle glaucoma is associated with glaucoma endophenotypes, while the intraocular pressure-dependent component is associated with blood pressure and vascular permeability. A genetic risk score for the intraocular pressure-independent component of primary open angle glaucoma is associated with 26 different retinal micro-vascular features, which contrasts with the genetic risk score for the intraocular pressure-dependent component. Increased understanding of these intraocular pressure-dependent and intraocular pressure-independent components provides insights into the pathogenesis of glaucoma.
The mechanisms connecting intraocular pressure to glaucoma remain unclear. Here, the authors use GWAS by subtraction to reveal intraocular pressure-independent aspects of glaucoma.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
