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Area of Science:

  • Genetics
  • Sleep Medicine
  • Cardiovascular Health

Background:

  • Obstructive sleep apnea (OSA) is a complex sleep disorder with a significant genetic component.
  • Excessive daytime sleepiness (EDS) is a persistent symptom in some OSA patients, even after treatment, and is linked to increased cardiovascular risk.
  • Understanding the interplay between genetic factors and EDS is crucial for identifying distinct OSA subtypes and associated health risks.

Purpose of the Study:

  • To investigate the influence of EDS as an exposure variable on genetic variations associated with the apnea-hypopnea index (AHI) in OSA.
  • To conduct the first large-scale genome-wide gene x environment interaction analysis for AHI, examining the interplay between genetic markers and EDS.
  • To explore these interactions across different sexes and within specific populations.

Main Methods:

  • Pooled whole genome sequencing data from over 11,500 individuals across seven cohorts and four population backgrounds.
  • Performed genome-wide gene x environment interaction analysis for AHI, with EDS as the exposure variable.
  • Analyzed genetic interactions across all sexes, and separately for males and females.

Main Results:

  • Identified 16 genetic targets showing evidence of interaction with EDS.
  • Eight of these genetic targets (CCDC3, MARCHF1, MED31, TMEM26, CPSF4L, PI4K2B, RAP1GAP, YY1) are newly reported in relation to OSA.
  • Specific genes were identified for interactions with EDS in all sexes, males only, and females only.

Conclusions:

  • The study highlights novel genetic variations interacting with EDS in OSA patients, contributing to AHI severity.
  • Identified genetic targets suggest potential links to metabolic pathways (e.g., insulin resistance) and nutrient deficiencies (e.g., thiamine).
  • Findings may inform targeted therapeutic strategies for OSA patients experiencing persistent EDS and associated cardiovascular risks.