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The Neuroscientist
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5-HT1A Receptors, Gene Repression, and Depression: Guilt by Association

Paul R. Albert

Ottawa Health Research Institute (Neuroscience) University of Ottawa, Ottawa, Canada

Sylvie Lemonde

Ottawa Health Research Institute (Neuroscience) University of Ottawa, Ottawa, Canada

The serotonin system is implicated in major depression and suicide and is negatively regulated by somatodendritic 5-HT1A autoreceptors. Desensitization of 5-HT1A autoreceptors is implicated in the 2- to 3-week latency for antidepressant treatments. Alterations in 5-HT1A receptor levels are reported in depression and suicide, and gene knockout of the 5-HT1A receptor results in an anxiety phenotype, suggesting that abnormal transcriptional regulation of this receptor gene may underlie these disorders. The 5-HT1A receptor gene is negatively regulated in neurons by repressors including REST/NRSF, Freud-1, NUDR/Deaf-1, and Hes5. The association with major depression, suicide, and panic disorder of a new functional 5-HT1A polymorphism at C(-1019)G that selectively blocks repression of the 5-HT1A autoreceptor by NUDR further suggests a causative role for altered regulation of this receptor in predisposition to mental illness. The authors review evidence that altered transcription of the 5-HT1A receptor can affect the serotonin system and limbic and cortical areas, leading to predisposition to depression. NEUROSCIENTIST 10(6):575-593, 2004. DOI:

Key Words: Stress • Raphe • Hippocampus • Mood disorders • SSRI • Anxiety

The Neuroscientist, Vol. 10, No. 6, 575-593 (2004)
DOI: 10.1177/1073858404267382


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