Article (Scientific journals)
Genetic polymorphisms of DAT1 and COMT differentially associate with actigraphy-derived sleep-wake cycles in young adults.
Valomon, Amandine; Holst, Sebastian C.; Bachmann, Valerie et al.
2014In Chronobiology International, 31 (5), p. 705-14
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Keywords :
Actigraphy; Activity Cycles/genetics; Adult; Age Factors; Body Weight; Catechol O-Methyltransferase/genetics; Dopamine Plasma Membrane Transport Proteins/genetics; Female; Gene Frequency; Healthy Volunteers; Heterozygote; Homozygote; Humans; Male; Minisatellite Repeats; Motor Activity/genetics; Phenotype; Polymorphism, Genetic; Sleep/genetics; Wakefulness/genetics; Young Adult; Body-mass-index; SLC6A3; circadian; daytime sleepiness; dopamine
Abstract :
[en] Accumulating evidence suggests that dopamine plays a key role in sleep-wake regulation. Cerebral dopamine levels are regulated primarily by the dopamine transporter (DAT) in the striatum and by catechol-O-methyl-transferase (COMT) in the prefrontal cortex. We hypothesized that the variable-number-tandem-repeat (VNTR) polymorphism in the 3'-untranslated region of the gene encoding DAT (DAT1, SLC6A3; rs28363170) and the Val158Met polymorphism of COMT (rs4680) differently affect actigraphy-derived rest-activity cycles and sleep estimates in healthy adults (65 men; 45 women; age range: 19-35 years). Daytime sleepiness, continuous rest-actigraphy and sleep diary data during roughly 4-weeks were analyzed. Nine-repeat (9R) allele carriers of DAT1 (n = 48) more often reported elevated sleepiness (Epworth sleepiness score >/=10) than 10-repeat (10R) allele homozygotes (n = 62, p < 0.02). Moreover, male 9R allele carriers showed higher wrist activity, whereas this difference was not present in women ("DAT1 genotype" x "gender" interaction: p < 0.005). Rest-activity patterns did not differ among COMT genotypes. Nevertheless, a significant "COMT genotype" x "type of day" (workdays vs. rest days) interaction for sleep duration was observed (p = 0.04). The Val/Val (n = 36) and Met/Met (n = 24) homozygotes habitually prolonged sleep on rest days compared to workdays by more than 30 min, while Val/Met heterozygotes (n = 50) did not significantly extend their sleep (mean difference: 7 min). Moreover, whereas the proportion of women among the genotype groups did not differ, COMT genotype affected body-mass-index (BMI), such that Val/Met individuals had lower BMI than the homozygous genotypes (p < 0.04). While awaiting independent replication and confirmation, our data support an association of genetically-determined differences in cerebral dopaminergic neurotransmission with daytime sleepiness and individual rest-activity profiles, as well as other sleep-associated health characteristics such as the regulation of BMI. The differential associations of DAT1 and COMT polymorphisms may reflect the distinct local expression of the encoded proteins in the brain.
Disciplines :
Neurosciences & behavior
Author, co-author :
Valomon, Amandine
Holst, Sebastian C.
Bachmann, Valerie
Viola, Antoine U.
Schmidt, Christina  ;  Université de Liège > Département de Psychologie : cognition et comportement > Neuropsychologie
Zurcher, Jurian
Berger, Wolfgang
Cajochen, Christian
Landolt, Hans-Peter
Language :
English
Title :
Genetic polymorphisms of DAT1 and COMT differentially associate with actigraphy-derived sleep-wake cycles in young adults.
Publication date :
2014
Journal title :
Chronobiology International
ISSN :
0742-0528
eISSN :
1525-6073
Publisher :
Marcel Dekker, New York, United States - New York
Volume :
31
Issue :
5
Pages :
705-14
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 October 2015

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