Abstract
Background
Whether obstructive sleep apnea (OSA) is causally associated with an increased risk of cerebral small vessel disease (CSVD) remains controversial. We conducted a two-sample Mendelian randomization (MR) study to clarify the causal relationship between OSA and CSVD risk.
Methods
Single-nucleotide polymorphisms associated with OSA at the genome-wide significance level (P < 5 × 10− 8) in the FinnGen consortium were selected as instrumental variables. Summary-level data for white matter hyperintensities (WMHs), lacunar infarctions (LIs), cerebral microbleeds (CMBs), fractional anisotropy (FA), and mean diffusivity (MD) were obtained from three meta-analyses of genome-wide association studies (GWASs). The random-effects inverse-variance weighted (IVW) method was selected for the major analysis. Weighted-median, MR-Egger, MR pleiotropy residual sum and outlier (MR-PRESSO), and leave-one-out analysis methods were implemented for the sensitivity analyses.
Results
Genetically predicted OSA was not associated with LIs (odds ratio [OR] = 1.10, 95% confidence interval [CI] = 0.86–1.40), WMHs (OR = 0.94, 95% CI = 0.83–1.07), FA (OR = 1.33, 95% CI = 0.75–2.33), MD (OR = 0.93, 95% CI = 0.58–1.47), CMBs (OR = 1.29, 95% CI = 0.86–1.94), mixed CMBs (OR = 1.17, 95% CI = 0.63–2.17), and lobar CMBs (OR = 1.15, 95% CI = 0.75–1.76) in IVW method. The results of the sensitivity analyses were generally consistent with the major analyses.
Conclusions
This MR study does not support causal associations between OSA and the risk of CSVD in individuals of European ancestry. These findings need to be further validated in randomized controlled trials, larger cohort studies, and MR studies based on larger GWASs.
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Data Availability
Summary-level data for lacunar stroke are publicly available (PMID: 33773637, https://cd.hugeamp.org/); Summary-level data for white matter hyperintensities, fractional anisotropy, and mean diffusivity are publicly available (PMID: 32358547, https://cd.hugeamp.org/); Summary-level data for cerebral microbleeds are publicly available (PMID: 32913026, https://cd.hugeamp.org/); FinnGen consortium data are available through application (https://r8.finngen.fi/).
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Acknowledgements
The authors wish to acknowledge all participants and investigators for sharing genome-wide association studies (GWASs) summary-level data.
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BW, FL, and GYS contributed to the study conception and design. BW, FL, and SW contributed to data acquisition and analysis. BW drafted the manuscript. BW and SW have revised the manuscript. All authors approved the current version of the manuscript for publication.
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Wu, B., Liu, F., Sun, G. et al. Correlation between obstructive sleep apnea and cerebral small vessel disease: a mendelian randomization study. Genes Genom 45, 1179–1186 (2023). https://doi.org/10.1007/s13258-023-01402-9
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DOI: https://doi.org/10.1007/s13258-023-01402-9