Serotonin transporter genotype (5-HTTLPR): effects of neutral and undefined conditions on amygdala activation.

Published

Journal Article

BACKGROUND: A polymorphism of the human serotonin transporter gene (SCL6A4) has been associated with serotonin transporter expression and with processing of aversive stimuli in the amygdala. Functional imaging studies show that during the presentation of aversive versus neutral cues, healthy carriers of the short (s) allele showed stronger amygdala activation than long (l) carriers. However, a recent report suggested that this interaction is driven by amygdala deactivation during presentation of neutral stimuli in s carriers. METHODS: Functional MRI was used to assess amygdala activation during the presentation of a fixation cross or affectively aversive or neutral visual stimuli in 29 healthy men. RESULTS: Amygdala activation was increased in s carriers during undefined states such as the presentation of a fixation cross compared with emotionally neutral conditions. CONCLUSIONS: This finding suggests that s carriers show stronger amygdala reactivity to stimuli and contexts that are relatively uncertain, which we propose are stressful.

Full Text

Duke Authors

Cited Authors

  • Heinz, A; Smolka, MN; Braus, DF; Wrase, J; Beck, A; Flor, H; Mann, K; Schumann, G; Büchel, C; Hariri, AR; Weinberger, DR

Published Date

  • April 2007

Published In

Volume / Issue

  • 61 / 8

Start / End Page

  • 1011 - 1014

PubMed ID

  • 17157270

Pubmed Central ID

  • 17157270

Electronic International Standard Serial Number (EISSN)

  • 1873-2402

International Standard Serial Number (ISSN)

  • 0006-3223

Digital Object Identifier (DOI)

  • 10.1016/j.biopsych.2006.08.019

Language

  • eng