PACAP receptor gene polymorphism impacts fear responses in the amygdala and hippocampus

Jennifer Strafford Stevens, Lynn M. Almli, Negar Fani, David A. Gutman, Bekh Bradley, Seth D. Norrholm, Emily Reiser, Timothy D. Ely, Rahim Dhanani, Ebony M. Glover, Tanja Jovanovic, Kerry J. Ressler

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

We have recently found higher circulating levels of pituitary adenylate cyclase-activating polypeptide (PACAP) associated with posttraumatic stress disorder (PTSD) symptoms in a highly traumatized cohort of women but not men. Furthermore, a single nucleotide polymorphism in the PACAP receptor gene ADCYAP1R1, adenylate cyclase activating polypeptide 1 receptor type 1, was associated with individual differences in PTSD symptoms and psychophysiological markers of fear and anxiety. The current study outlines an investigation of individual differences in brain function associated with ADCYAP1R1 genotype. Forty-nine women who had experienced moderate to high levels of lifetime trauma participated in a functional MRI task involving passive viewing of threatening and neutral face stimuli. Analyses focused on the amygdala and hippocampus, regions that play central roles in the pathophysiology of PTSD and are known to have high densities of PACAP receptors. The risk genotype was associated with increased reactivity of the amygdala and hippocampus to threat stimuli and decreased functional connectivity between the amygdala and hippocampus. The findings indicate that the PACAP system modulates medial temporal lobe function in humans. Individual differences in ADCYAP1R1 genotype may contribute to dysregulated fear circuitry known to play a central role in PTSD and other anxiety disorders.

Original languageEnglish (US)
Pages (from-to)3158-3163
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume111
Issue number8
DOIs
StatePublished - Feb 25 2014
Externally publishedYes

Keywords

  • Emotion
  • fMRI
  • Intermediate phenotype
  • Single nucleotide polymorphism

ASJC Scopus subject areas

  • General

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