Genome-wide discovery reveals 30 loci for choroidal thickness and uncovers potential causal links with angle-closure glaucoma
Lee, S. S.-Y.; Wang, C. A.; de Vries, V. A.; van Hemert, D. J.; Schulze, A.; Brandl, C.; Aman, A. M.; Alonso-Caneiro, D.; Choquet, H.; Gorski, M.; Hammond, C. J.; Heid, I. M.; Hunter, M. L.; Hysi, P.; Jiang, C.; Jonas, J.; Klaver, C. C.; Kneepkens, S.; Konig, S.; Lingham, G.; Luber, C.; Melton, P. E.; Pennell, C. E.; Ramdas, W. D.; Read, S. A.; Schuster, A. K.; Wang, Y. X.; Zimmermann, M. E.; International Glaucoma Genetics Consortium, ; Khawaja, A. P.; Gharahkhani, P.; MacGregor, S.; Guggenheim, J. A.; Mackey, D. A.
Show abstract
The choroid is critical for maintaining vision and implicated in several ocular diseases, being the sole source of nutrients and waste removal for the outer retina. Genetic discovery can help elucidate the pathways through which choroidal features influence disease risk. Our meta-analysis of genome-wide association studies (n= 78,682 participants) identified 30 genomic regions, including 20 novel loci, associated with choroidal thickness. Findings suggest inflammatory and vascular processes drive choroidal thickness, with overlapping mechanisms shared with refractive error. Genome-wide independently significant SNPs accounted for 18.7% of the genetic variance in choroidal thickness. Mendelian randomisation analyses showed a causal effect of age-related macular degeneration on choroidal thickness, and suggest a bidirectional causal effect between choroidal thickness and primary angle-closure glaucoma. These findings provide insight into the shared genetic architecture and biological pathways linking choroidal thickness and related diseases.
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