The associations of daylight and melatonin receptor 1B gene rs10830963 variant with glycemic traits : the prospective PPP-Botnia study

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Haljas , K , Hakaste , L , Lahti , J , Isomaa , B , Groop , L , Tuomi , T & Räikkönen , K 2019 , ' The associations of daylight and melatonin receptor 1B gene rs10830963 variant with glycemic traits : the prospective PPP-Botnia study ' , Annals of Medicine , vol. 51 , no. 1 , pp. 58-67 . https://doi.org/10.1080/07853890.2018.1564357

Title: The associations of daylight and melatonin receptor 1B gene rs10830963 variant with glycemic traits : the prospective PPP-Botnia study
Author: Haljas, Kadri; Hakaste, Liisa; Lahti, Jari; Isomaa, Bo; Groop, Leif; Tuomi, Tiinamaija; Räikkönen, Katri
Contributor: University of Helsinki, Department of Psychology and Logopedics
University of Helsinki, Endokrinologian yksikkö
University of Helsinki, Department of Psychology and Logopedics
University of Helsinki, Centre of Excellence in Complex Disease Genetics
University of Helsinki, Centre of Excellence in Complex Disease Genetics
University of Helsinki, Doctoral Programme in Cognition, Learning, Instruction and Communication
Date: 2019-01-02
Language: eng
Number of pages: 10
Belongs to series: Annals of Medicine
ISSN: 0785-3890
URI: http://hdl.handle.net/10138/326373
Abstract: Background: Seasonal variation in glucose metabolism might be driven by changes in daylight. Melatonin entrains circadian regulation and is directly associated with daylight. The relationship between melatonin receptor 1B gene variants with glycemic traits and type 2 diabetes is well established. We studied if daylight length was associated with glycemic traits and if it modified the relationship between melatonin receptor 1B gene rs10830963 variant and glycemic traits. Materials: A population-based sample of 3422 18-78-year-old individuals without diabetes underwent an oral glucose tolerance test twice, an average 6.8 years (SD = 0.9) apart and were genotyped for rs10830963. Daylight data was obtained from the Finnish Meteorological Institute. Results: Cross-sectionally, more daylight was associated with lower fasting glucose, but worse insulin sensitivity and secretion at follow-up. Longitudinally, individuals studied on lighter days at follow-up than at baseline showed higher glucose values during the oral glucose tolerance test and lower Corrected Insulin Response at follow-up. GG genotype carriers in the rs10830963 became more insulin resistant during follow-up if daylight length was shorter at follow-up than at baseline. Conclusions: Our study shows that individual glycemic profiles may vary according to daylight, MTNR1B genotype and their interaction. Future studies may consider taking daylight length into account.Key messages In Western Finland, the amount daylight follows an extensive annual variation ranging from 4 h 44 min to 20 h 17 min, making it ideal to study the associations between daylight and glycemic traits. Moreover, this allows researchers to explore if the relationship between the melatonin receptor 1B gene rs10830963 variant and glycemic traits is modified by the amount of daylight both cross-sectionally and longitudinally. This study shows that individuals, who participated in the study on lighter days at the follow-up than at the baseline, displayed to a greater extent worse glycemic profiles across the follow-up. Novel findings from the current study show that in the longitudinal analyses, each addition of the minor G allele of the melatonin receptor 1B gene rs10830963 was associated with worsening of fasting glucose values and insulin secretion across the 6.8-year follow-up. Importantly, this study shows that in those with the rs10830963 GG genotype, insulin sensitivity deteriorated the most significantly across the 6.8-year follow-up if the daylight length on the oral glucose tolerance testing date at the follow-up was shorter than at the baseline. Taken together, the current findings suggest that the amount of daylight may affect glycemic traits, especially fasting glucose and insulin secretion even though the effect size is small. The association can very according to the rs10830963 risk variant. Further research is needed to elucidate the mechanisms behind these associations.
Subject: Diabetes
glycemic traits
insulin sensitivity and resistance
melatonin
MTNR1B
daylight
seasonality
BETA-CELL FUNCTION
FASTING PLASMA-GLUCOSE
INSULIN-RESISTANCE
SEASONAL-VARIATION
DIABETES-MELLITUS
SHIFT WORK
SECRETION
RISK
SENSITIVITY
3121 General medicine, internal medicine and other clinical medicine
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