Epigenetics of obstructive sleep apnea syndrome: a systematic review

Study Objectives: Obstructive sleep apnea (OSA) is a chronic and widely prevalent disease associated with multiple health disorders. Current diagnostic strategies for OSA are limited because of cost, time, and access. Epigenetic signatures offer insight into the relationships between disease and environment and could play a significant role in developing both diagnostic and therapeutic tools for OSA. In the current study, a systematic literature search was conducted to investigate the existing evidence of OSA-associated epigenetic modifications. Methods: A systematic literature search was performed using electronic academic databases including PubMed, CINAHL, Scopus, Embase, EBM Reviews, and Web of Science. However, the current study focused on screening for original, English-language articles pertaining to OSA and associated epigenetic mechanisms. To produce unbiased results, screening was performed independently by authors. Results: We identified 2,944 publications in our systematic search. Among them, 65 research articles were related to OS A-associated differential gene expression, genetic variation, and epigenetic modifications. Although these 65 articles were considered for full manuscript review, only 12 articles met the criteria of OSA-associated epigenetic modifications in human and animal models. Human patients with OSA had unique epigenetic changes compared to healthy control patients and, interestingly, epigenetic signatures were commonly identified in genes associated with metabolic and inflammatory pathways. Conclusions: Although the available studies are limited, this research provides novel insights for the development of epigenetic markers for the diagnosis and treatment of OSA. Thorough genome-wide investigations will be required to develop cost-effective, robust biomarkers for the identification of OSA among children and adults. Here, we offer a study design for such efforts.