Glaucoma Genetic Risk Scores in the Million Veteran Program

Overview

Journal Ophthalmology

Publisher Elsevier

Specialty Ophthalmology

Date 2022 Jun 19

PMID 35718050

Authors

Andrea R Waksmunski

Tyler G Kinzy

Lauren A Cruz

Cari L Nealon

Christopher W Halladay

Piana Simpson

Rachael L Canania

Scott A Anthony

David P Roncone

Lea Sawicki Rogers

Jenna N Leber

Jacquelyn M Dougherty

Paul B Greenberg

Jack M Sullivan

Wen-Chih Wu

Sudha K Iyengar

Dana C Crawford

Neal S Peachey

Jessica N Cooke Bailey

Affiliations

Soon will be listed here.

Abstract

Purpose: Primary open-angle glaucoma (POAG) is a degenerative eye disease for which early treatment is critical to mitigate visual impairment and irreversible blindness. POAG-associated loci individually confer incremental risk. Genetic risk score(s) (GRS) could enable POAG risk stratification. Despite significantly higher POAG burden among individuals of African ancestry (AFR), GRS are limited in this population. A recent large-scale, multi-ancestry meta-analysis identified 127 POAG-associated loci and calculated cross-ancestry and ancestry-specific effect estimates, including in European ancestry (EUR) and AFR individuals. We assessed the utility of the 127-variant GRS for POAG risk stratification in EUR and AFR Veterans in the Million Veteran Program (MVP). We also explored the association between GRS and documented invasive glaucoma surgery (IGS).

Design: Cross-sectional study.

Participants: MVP Veterans with imputed genetic data, including 5830 POAG cases (445 with IGS documented in the electronic health record) and 64 476 controls.

Methods: We tested unweighted and weighted GRS of 127 published risk variants in EUR (3382 cases and 58 811 controls) and AFR (2448 cases and 5665 controls) Veterans in the MVP. Weighted GRS were calculated using effect estimates from the most recently published report of cross-ancestry and ancestry-specific meta-analyses. We also evaluated GRS in POAG cases with documented IGS.

Main Outcome Measures: Performance of 127-variant GRS in EUR and AFR Veterans for POAG risk stratification and association with documented IGS.

Results: GRS were significantly associated with POAG (P < 5 × 10) in both groups; a higher proportion of EUR compared with AFR were consistently categorized in the top GRS decile (21.9%-23.6% and 12.9%-14.5%, respectively). Only GRS weighted by ancestry-specific effect estimates were associated with IGS documentation in AFR cases; all GRS types were associated with IGS in EUR cases.

Conclusions: Varied performance of the GRS for POAG risk stratification and documented IGS association in EUR and AFR Veterans highlights (1) the complex risk architecture of POAG, (2) the importance of diverse representation in genomics studies that inform GRS construction and evaluation, and (3) the necessity of expanding diverse POAG-related genomic data so that GRS can equitably aid in screening individuals at high risk of POAG and who may require more aggressive treatment.

Citing Articles

A multi-cohort genome-wide association study in African ancestry individuals reveals risk loci for primary open-angle glaucoma.

Verma S, Gudiseva H, Chavali V, Salowe R, Bradford Y, Guare L Cell. 2024; 187(2):464-480.e10.

PMID: 38242088 PMC: 11844349. DOI: 10.1016/j.cell.2023.12.006.

Power of inclusion: Enhancing polygenic prediction with admixed individuals.

Tanigawa Y, Kellis M Am J Hum Genet. 2023; 110(11):1888-1902.

PMID: 37890495 PMC: 10645553. DOI: 10.1016/j.ajhg.2023.09.013.

Diversity in Polygenic Risk of Primary Open-Angle Glaucoma.

Cooke Bailey J, Funk K, Cruz L, Waksmunski A, Kinzy T, Wiggs J Genes (Basel). 2023; 14(1).

PMID: 36672852 PMC: 9859496. DOI: 10.3390/genes14010111.

Diversity is key for cross-ancestry transferability of glaucoma genetic risk scores in Hispanic Veterans in the Million Veteran Program.

Waksmunski A, Kinzy T, Cruz L, Nealon C, Halladay C, Anthony S Pac Symp Biocomput. 2022; 28:413-424.

PMID: 36540996 PMC: 9997528.

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