Genetic Associations Between Smoking- and Glaucoma-Related Traits

Jessica H Tran, Kelsey V Stuart, UK Biobank Eye and Vision Consortium, International Glaucoma Genetics Consortium, Victor de Vries, Joëlle E Vergroesen, Clara C Cousins, Pirro G Hysi, Ron Do, Ghislain Rocheleau, Jae H Kang, Janey L Wiggs, Stuart MacGregor, Anthony P Khawaja, David A Mackey, Caroline C W Klaver, Wishal D Ramdas, Louis R Pasquale

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Abstract

PURPOSE: The purpose of this study was to describe the genetic relationship between smoking and glaucoma.

METHODS: We used summary-level genetic data for smoking initiation, smoking intensity (cigarettes per day [CPD]), intraocular pressure (IOP), vertical cup-disc ratio, and open-angle glaucoma (OAG) to estimate global genetic correlations (rg) and perform two-sample Mendelian randomization (MR) experiments that explored relations between traits. Finally, we examined associations between smoking genetic risk scores (GRS) and smoking traits with measured IOP and OAG in Rotterdam Study participants.

RESULTS: We identified weak inverse rg between smoking- and glaucoma-related traits that were insignificant after Bonferroni correction. However, MR analysis revealed that genetically predicted smoking initiation was associated with lower IOP (-0.18 mm Hg per SD, 95% confidence interval [CI] = -0.30 to -0.06, P = 0.003). Furthermore, genetically predicted smoking intensity was associated with decreased OAG risk (odds ratio [OR] = 0.74 per SD, 95% CI = 0.61 to 0.90, P = 0.002). In the Rotterdam Study, the smoking initiation GRS was associated with lower IOP (-0.09 mm Hg per SD, 95% CI = -0.17 to -0.01, P = 0.04) and lower odds of OAG (OR = 0.84 per SD, 95% CI = 0.73 to 0.98, P = 0.02) in multivariable-adjusted analyses. In contrast, neither smoking history nor CPD was associated with IOP (P ≥ 0.38) or OAG (P ≥ 0.54). Associations between the smoking intensity GRS and glaucoma traits were null (P ≥ 0.13).

CONCLUSIONS: MR experiments and GRS generated from Rotterdam Study participants support an inverse relationship between smoking and glaucoma.

TRANSLATIONAL RELEVANCE: Understanding the genetic drivers of the inverse relationship between smoking and glaucoma could yield new insights into glaucoma pathophysiology.

Original languageEnglish
Article number20
Pages (from-to)20
Number of pages1
JournalTranslational Vision Science & Technology
Volume12
Issue number2
DOIs
Publication statusPublished - 1 Feb 2023

Bibliographical note

Acknowledgments
Supported by NEI R01 015473, an unrestricted Challenge Grant from Research to Prevent Blindness (NYC), and the Glaucoma Foundation. The Rotterdam Study is supported by the Erasmus Medical Center and Erasmus University Rotterdam, the Netherlands Organization for Scientific Research (NWO), in particular through NWO Grant 91815655, the Netherlands Organization for Health Research and Development (ZonMw), the Research Institute for Diseases in the Elderly (RIDE); the Ministry of Education, Culture and Science, the Ministry of Health, Welfare and Sports, the European Commission (DG XII), the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme Grant 648268, and the Municipality of Rotterdam. Additional support was given by Stichting Glaucoomfonds, Landelijke Stichting voor Blinden en Slechtzienden (LSBS), Stichting Oogfonds Nederland, Rotterdamse Stichting Blindenbelangen (RSB), Stichting Lijf en Leven, Henkes Stichting, Stichting voor Ooglijders, and Stichting Blindenhulp. The sponsor or funding organizations had no role in the design or conduct of this research.

Copyright 2023 The Authors

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