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Contextual and Cued Fear Conditioning Test Using a Video Analyzing System in Mice
19:32

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Published on: March 1, 2014

COMT genetic variation affects fear processing: psychophysiological evidence.

Christian Montag1, Joshua W Buckholtz, Peter Hartmann

  • 1Department of Psychology, University of Bonn, Bonn, Germany.

Behavioral Neuroscience
|August 30, 2008
PubMed
Summary
This summary is machine-generated.

The catechol-O-methyltransferase (COMT) Val158Met gene variant influences emotional regulation. Met158 homozygotes showed a heightened startle reflex to aversive stimuli, suggesting a role in anxiety disorders.

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Area of Science:

  • Neuroscience
  • Psychiatric Genetics
  • Molecular Psychiatry

Background:

  • Emotional dysregulation is central to psychiatric disorders like anxiety.
  • Genetic factors significantly influence anxiety disorder risk, yet few specific genes are identified.
  • The catechol-O-methyltransferase (COMT) Val158Met gene variant is a candidate for anxiety and emotional processing alterations.

Purpose of the Study:

  • To investigate the association between COMT Val158Met and DRD2/ANKK1 Taq Ia polymorphisms with emotion processing.
  • To examine the impact of these genetic variants on the acoustic affective startle reflex modulation (ASRM) in healthy women.

Main Methods:

  • The study analyzed 96 healthy women genotyped for COMT Val158Met and DRD2/ANKK1 Taq Ia.
  • The acoustic affective startle reflex modulation (ASRM) paradigm was used to measure psychophysiological emotion processing.
  • Anxiety traits were assessed using Gray's Behavioral Inhibition System.

Main Results:

  • COMT Val158Met genotype significantly modulated startle reflex to aversive stimuli.
  • Met158 homozygotes displayed a potentiated startle reflex compared to Val158 carriers.
  • Anxiety trait measures correlated with ASRM, but DRD2/ANKK1 Taq Ia had no effect.

Conclusions:

  • The COMT 158Met allele is associated with altered emotional arousal and regulation.
  • Findings support genetic and neuroimaging evidence linking COMT to affective psychopathology.
  • This highlights COMT's role in the neural systems underlying emotional processing and anxiety.