Objective Evidence for the association between circadian rhythm delay and depression is
accumulating. Genetic studies have shown that certain polymorphisms in circadian genes …

BACKGROUND: Seasonal affective disorder and seasonal rhythms in mood and behavior
(seasonality) have been reported to be associated with serotonergic system. In this study we …

Seasonal Affective Disorder (SAD), seasonality and increased sensitivity to the fluctuation of
seasons in biological and psychological parameters can manifest to varying degrees across …

Polymorphisms in human circadian genes are potential genetic markers that affect diurnal
preference in several populations. In this study, we evaluated whether four polymorphisms …

Background. Conflicting results have been reported in previous association studies of the
serotonin transporter promoter repeat length polymorphism (5-HTTLPR), seasonal affective …

Seasonal variations in mood and behavior (seasonality) and seasonal affective disorder
(SAD) have been attributed to seasonal fluctuations in brain serotonin (5-HT). 1 the short (s) …

Disturbed circadian rhythms have been observed in seasonal affective disorder (SAD). The
aim of this study was to further investigate this connection, and to test for potential …

Sleep timing is influenced by the circadian system. Morningness‐eveningness (ME)
preference in humans is affected by the free‐running period, which is determined by …

Genes involved in serotonin metabolism are good candidates for the pathogenesis of
seasonal affective disorder (SAD). A functional variant in the serotonin transporter promoter …

Background Evidences suggest that alterations in circadian rhythms trigger the development
of mental disorders. Eveningness, sleep behavior, and circadian genes polymorphisms …