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BMC Ophthalmology
Published in: BMC Ophthalmology 1/2020

Open Access 01-12-2020 | Glaucoma | Research article

Plasma lipid levels and risk of primary open angle glaucoma: a genetic study using Mendelian randomization

Authors: Mengqiao Xu, Shengguo Li, Jundong Zhu, Dawei Luo, Weitao Song, Minwen Zhou

Published in: BMC Ophthalmology | Issue 1/2020

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Abstract

Background

The causal effects of plasma lipid concentrations and the risk of primary open angle glaucoma (POAG) are still unclear. Thus, the purpose of this study was to identify, applying a two-sample Mendelian randomization (MR) analysis, whether plasma lipid concentrations are causally associated with the risk of POAG.

Methods

Two-sample MR analysis of data from a genome-wide association study (GWAS) was performed to investigate the causal role of plasma lipid levels and POAG. A total of 185 independent single-nucleotide polymorphisms (SNPs) associated with plasma lipid levels were selected as instrumental variables (IVs). The SNPs were obtained from a meta-analysis of GWAS based on 188,577 European-ancestry individuals for MR analyses. Association with POAG for the SNPs was obtained from a GWAS conducted among the United Kingdom (UK) Biobank study participants with a total of 463,010 European-ancestry individuals. Four MR methods (inverse variance weighted [IVW], weighted mode, weighted median, and MR-Egger regression) were applied to obtain the overall causal estimate for multiple, instrumental SNPs.

Results

Using the IVW analysis method, no evidence was found to support a causal association between plasma LDL-C level and POAG risk (β = − 0.00026; 95% CI = -0.00062, 0.00011; P = 0.165) with no significant heterogeneity among SNPs. The overall causal estimate between plasma LDL-C level and POAG was consistent using the other three MR methods. Using the four MR methods, no evidence of an association between plasma HDL-C (β = 0.00023; 95% CI = -0.00015, 0.00061; P = 0.238; IVW method) or TG levels (β = − 0.00028; 95% CI = -0.00071, 0.00015; P = 0.206; IVW method) and POAG risk was found. Sensitivity analyses did not reveal any sign of directional pleiotropy.

Conclusions

The present study did not find any evidence for a causal association between plasma lipid levels and POAG risk. Further research is needed to elucidate the potential biological mechanisms to provide a reasonable interpretation for these results.
Appendix
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Metadata
Title
Plasma lipid levels and risk of primary open angle glaucoma: a genetic study using Mendelian randomization
Authors
Mengqiao Xu
Shengguo Li
Jundong Zhu
Dawei Luo
Weitao Song
Minwen Zhou
Publication date
01-12-2020
Publisher
BioMed Central
Keyword
Glaucoma
Published in
BMC Ophthalmology / Issue 1/2020
Electronic ISSN: 1471-2415
DOI
https://doi.org/10.1186/s12886-020-01661-0

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