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Imam, A.* ; Winnebeck, E.C.* ; Buchholz, N.* ; Froguel, P.* ; Bonnefond, A.* ; Solimena, M. ; Ivanova, A. ; Bouvier, M.* ; Plouffe, B.* ; Charpentier, G.* ; Karamitri, A.* ; Jockers, R.* ; Roenneberg, T.* ; Vetter, C.*

Circadian, sleep and caloric intake phenotyping in type 2 diabetes patients with rare melatonin receptor 2 mutations and controls: A pilot study.

Front. Physiol. 11:564140 (2020)

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BackgroundMelatonin modulates circadian rhythms in physiology and sleep initiation. Genetic variants of the MTNR1B locus, encoding the melatonin MT2 receptor, have been associated with increased type 2 diabetes (T2D) risk. Carriers of the common intronic MTNR1B rs10830963 T2D risk variant have modified sleep and circadian traits such as changes of the melatonin profile. However, it is currently unknown whether rare variants in the MT2 coding region are also associated with altered sleep and circadian phenotypes, including meal timing. Materials and MethodsIn this pilot study, 28 individuals [50% male; 46-82 years old; 50% with rare MT2 mutations (T2D MT2)] wore actigraphy devices and filled out daily food logs for 4 weeks. We computed circadian, sleep, and caloric intake phenotypes, including sleep duration, timing, and regularity [assessed by the Sleep Regularity Index (SRI)]; composite phase deviations (CPD) as well a sleep timing-based proxy for circadian misalignment; and caloric intake patterns throughout the day. Using regression analyses, we estimated age- and sex-adjusted mean differences (MD) and 95% confidence intervals (95%CI) between the two patient groups. Secondary analyses also compare T2D MT2 to 15 healthy controls. ResultsPatients with rare MT2 mutations had a later sleep onset (MD = 1.23, 95%CI = 0.42;2.04), and midsleep time (MD = 0.91, 95%CI = 0.12;1.70), slept more irregularly (MD in SRI = -8.98, 95%CI = -16.36;-1.60), had higher levels of behavioral circadian misalignment (MD in CPD = 1.21, 95%CI = 0.51;1.92), were more variable in regard to duration between first caloric intake and average sleep offset (MD = 1.08, 95%CI = 0.07;2.08), and had more caloric episodes in a 24 h day (MD = 1.08, 95%CI = 0.26;1.90), in comparison to T2D controls. Secondary analyses showed similar patterns between T2D MT2 and non-diabetic controls. ConclusionThis pilot study suggests that compared to diabetic controls, T2D MT2 patients display a number of adverse sleep, circadian, and caloric intake phenotypes, including more irregular behavioral timing. A prospective study is needed to determine the role of these behavioral phenotypes in T2D onset and severity, especially in view of rare MT2 mutations.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Mtnr1b ; Mt2 ; Sleep ; Diet ; Circadian Misalignment ; Social Jetlag ; Diabetes; Social Jetlag; Mtnr1b; Risk; Misalignment; Pharmacology; Association; Variants

ISSN (print) / ISBN 1664-042X

e-ISSN 1664-042X

Journal Frontiers in Physiology

Quellenangaben Volume: 11, Article Number: 564140

Publisher Frontiers

Publishing Place Lausanne

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute for Pancreatic Beta Cell Research (IPI)

Grants Fondation de la Recherche Medicale (Equipe FRM)
Agence Nationale de la Recherche
DFG