Biological rhythm disturbances in mood disordersWirz-Justice, AnnaInternational Clinical Psychopharmacology: February 2006 - Volume 21 - Issue - p S11-S15 doi: 10.1097/01.yic.0000195660.37267.cf Original article Buy Abstract Author InformationAuthors Article MetricsMetrics From earliest times, psychiatrists have described biological rhythm disturbances as characteristic of mood disorders. The present flourishing of circadian biology has revealed the molecular basis of 24-h rhythmicity driven by ‘clock’ genes, as well as the importance of zeitgebers (synchronisers). Winter depression was first modelled on regulation of animal behaviour by seasonal changes in daylength, and led to application of light as the first successful chronobiological treatment in psychiatry. Light therapy has great promise for many other disorders (e.g. sleep–wake cycle disturbances in Alzheimer's dementia, bulimia, premenstrual disorder, depression during pregnancy) and, importantly, as an adjuvant to antidepressant medication in major non-seasonal depression. The pineal hormone melatonin is also a zeitgeber for the human circadian system, in addition to possessing direct sleep-promoting effects. Chronobiology has provided efficacious non-pharmaceutical treatments for mood disorders (such as sleep deprivation or light therapy) as well as novel approaches to new drugs (e.g. agomelatine). Centre for Chronobiology, Psychiatric University Clinics, Basel, Switzerland Correspondence and requests for reprints to Professor Anna Wirz-Justice, Centre for Chronobiology, Psychiatric University Clinics, Wilhelm Klein Strasse 27, CH-4025 Basel, Switzerland Tel: +41 61 3255473; fax: +41 61 3255577; e-mail: email@example.com © 2006 Lippincott Williams & Wilkins, Inc.