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Published on: March 2, 2015
Serotonergic genes modulate amygdala activity in major depression.
U Dannlowski1, P Ohrmann, J Bauer
1Department of Psychiatry, University of Münster, Münster, GermanyIZKF-Research Group 4, IZKF Münster, University of Münster, Münster, Germany. dannlow@uni-muenster.de
Genes, Brain, and Behavior
|February 8, 2007
Summary
Genetic variations in serotonin transporter (5-HTTLPR) and serotonin receptor 1A (5-HT(1A)) genes are linked to major depression. Risk allele carriers showed increased amygdala activation, suggesting a genetic basis for depression via emotion processing pathways.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Serotonergic genes are implicated in depression pathogenesis.
- Neural activity during emotion processing is influenced by these genes.
Purpose of the Study:
- Investigate amygdala activity in major depression using an imaging genomics approach.
- Examine the role of serotonin transporter (5-HTTLPR) and serotonin receptor 1A (5-HT(1A)-1019C/G) gene polymorphisms.
Main Methods:
- Functional magnetic resonance imaging (fMRI) at 3 Tesla to assess amygdala responses to emotional faces.
- Genotyping for 5-HT(1A)-1019C/G, 5-HTTLPR, and 5-HTT-rs25531 polymorphisms in 27 medicated patients with major depression.
Main Results:
- Risk allele carriers for either gene exhibited significantly increased bilateral amygdala activation.
- An additive effect of both genotypes was observed in response to emotional stimuli.
Conclusions:
- Genetic susceptibility for major depression may be linked to dysfunctional neural activity in emotion processing brain regions.
- These findings highlight the interplay between genetics and brain function in major depression.
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