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Genetic Variations Associated with Sleep Disorders in Patients with Schizophrenia: A Systematic Review

1
Department of Psychiatry, School of Medicine, University of Patras, Rion, Patras 26504, Greece
2
Department of Pharmacy, School of Health Sciences, University of Patras, Rion, Patras 26404, Greece
3
Department of Pathology, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, P.O.Box 17666, UAE
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Medicines 2018, 5(2), 27; https://doi.org/10.3390/medicines5020027
Received: 31 December 2017 / Revised: 21 March 2018 / Accepted: 22 March 2018 / Published: 24 March 2018
(This article belongs to the Special Issue Schizophrenia and Sleep Disorders)
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Abstract

Background: Schizophrenic patients commonly suffer from sleep disorders which are associated with acute disease severity, worsening prognoses and a poorer quality of life. Research is attempting to disentangle the complex interplay between schizophrenia and sleep disturbances by focusing not only on demographic and clinical characteristics, but also on the identification of genetic factors. Methods: Here, we performed a systematic literature review on the topic of genetic variations in sleep-disordered schizophrenic patients in an attempt to identify high quality investigations reporting scientifically sound and clinically useful data. For this purpose, we conducted a thorough search of PubMed, ScienceDirect and GoogleScholar databases, according to the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) protocol. Results: Our search yielded 11 eligible studies. Certain genetic variations were reported to be associated with schizophrenia-related sleep disorders. Antipsychotic-induced restless legs syndrome was linked to polymorphisms located on CLOCK, BTBD9, GNB3, and TH genes, clozapine-induced somnolence was correlated with polymorphisms of HNMT gene, while insomnia was associated with variants of the MTNR1 gene. Conclusions: There are significant genetic associations between schizophrenia and co-morbid sleep disorders, implicating the circadian system, dopamine and histamine metabolism and signal transduction pathways. View Full-Text
Keywords: schizophrenia; sleep disorders; genes; polymorphisms; insomnia; circadian; somnolence; restless-legs syndrome schizophrenia; sleep disorders; genes; polymorphisms; insomnia; circadian; somnolence; restless-legs syndrome
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Assimakopoulos, K.; Karaivazoglou, K.; Skokou, M.; Kalogeropoulou, M.; Kolios, P.; Gourzis, P.; Patrinos, G.P.; Tsermpini, E.E. Genetic Variations Associated with Sleep Disorders in Patients with Schizophrenia: A Systematic Review. Medicines 2018, 5, 27.

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