Relationship of the serotonin transporter gene promoter polymorphism (5-HTTLPR) genotype and serotonin transporter binding to neural processing of negative emotional stimuli

Noam Schneck, Jefvrey M. Miller, Christine Delorenzo, Toshiaki Kikuchi, M. Elizabeth Sublette, Maria A. Oquend, J. John Mann, Ramin V. Parsey

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Background The lower-expressing (S′) alleles of the serotonin transporter (5-HTT) gene promoter polymorphism (5-HTTLPR) are linked to mood and anxiety related psychopathology. However, the specific neural mechanism through which these alleles may influence emotional and cognitive processing remains unknown. We examined the relationship between both 5-HTTLPR genotype and in vivo 5-HTT binding quantified via PET with amygdala reactivity to emotionally negative stimuli. We hypothesized that 5-HTT binding in both raphe nuclei (RN) and amygdala would be inversely correlated with amygdala reactivity, and that number of S′ alleles would correlate positively with amygdala reactivity. Methods In medication-free patients with current major depressive disorder (MDD; N=21), we determined 5-HTTLPR genotype, employed functional magnetic resonance imaging (fMRI) to examine amygdala responses to negative emotional stimuli, and used positron emission tomography with [11C]DASB to examine 5-HTT binding. Results [11C]DASB binding in RN and amygdala was inversely correlated with amygdala response to negative stimuli. 5-HTTLPR S′ alleles were not associated with amygdala response to negative emotional stimuli. Limitations Primary limitations are small sample size and lack of control group. Conclusions Consistent with findings in healthy volunteers, 5-HTT binding is associated with amygdala reactivity to emotional stimuli in MDD. 5-HTT binding may be a stronger predictor of emotional processing in MDD as compared with 5-HTTLPR genotype.

Original languageEnglish
Pages (from-to)494-498
Number of pages5
JournalJournal of Affective Disorders
Volume190
DOIs
Publication statusPublished - 2016 Jan 15

    Fingerprint

Keywords

  • Biological Markers
  • Brain Imaging
  • Depression
  • Functional MRI
  • Genetics

ASJC Scopus subject areas

  • Clinical Psychology
  • Psychiatry and Mental health

Cite this