Genetic pleiotropy highlights immune mechanisms that link insomnia and C-reactive protein

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ID: 332311
2026
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Abstract
Abstract Insomnia is a prevalent sleep disorder with growing evidence implicating immune and inflammatory processes. Elevated C-reactive protein (CRP), a marker of systemic inflammation, is frequently observed in individuals with poor sleep, yet the genetic basis of this relationship remains unclear. This study aims to characterize the shared genetic architecture between insomnia and CRP using large-scale genomic data. CRP levels were significantly elevated in 130 611 individuals with insomnia compared with 327 375 controls in the UK Biobank. Genome-wide genetic correlation, pleiotropic analysis, colocalization, Mendelian randomization (MR), and functional annotation were used to characterize shared genetic architecture and biological pathways. Insomnia and CRP showed a significant positive genetic correlation. We identified 125 pleiotropic loci jointly associated with insomnia and CRP. Functional annotation implicated chromatin organization and nucleosome assembly, while pathway analyses highlighted immune signaling, cellular senescence, and programmed cell death. Colocalization analysis provided support for shared causal variants at six loci in or near APOE, HLA-B, NLGN1, AK5/DNAJB4, FAM114A2/GRIA1, and SATB1. Bidirectional MR provided stronger evidence for a directional relationship from insomnia liability to elevated CRP than in the reverse direction. This study uncovers shared genetic mechanisms linking insomnia and systemic inflammation. The directional genetic relationship from insomnia liability to elevated CRP suggests that sleep dysfunction may contribute to inflammatory processes.
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openalex_W7221797209 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Farah Abou Daya, Jesse Tyler Valliere, Matthew Maher, Richa Saxena
Journal Sleep & breathing = Schlaf & Atmung
Year 2026
DOI
10.1093/sleep/zsag254
URL
https://doi.org/10.1093/sleep/zsag254
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