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The serotonin transporter gene linked polymorphic region is associated with the behavioral response to repeated stress exposure in infant rhesus macaques

Published online by Cambridge University Press:  31 January 2012

Simona Spinelli*
Affiliation:
National Institute on Alcohol Abuse and Alcoholism
Melanie L. Schwandt
Affiliation:
National Institute on Alcohol Abuse and Alcoholism
Stephen G. Lindell
Affiliation:
National Institute on Alcohol Abuse and Alcoholism
Markus Heilig
Affiliation:
National Institute on Alcohol Abuse and Alcoholism
Stephen J. Suomi
Affiliation:
National Institute of Child Health and Human Development
J. Dee Higley
Affiliation:
Brigham Young University
David Goldman
Affiliation:
National Institute on Alcohol Abuse and Alcoholism
Christina S. Barr
Affiliation:
National Institute on Alcohol Abuse and Alcoholism
*
Address correspondence and reprint requests to: Simona Spinelli, Preclinical Laboratory for Translational Research Into Affective Disorders, Clinic for Affective Disorders and General Psychiatry, Psychiatric University Hospital Zurich, August Forel-Strasse 7, Zurich CH-8008, Switzerland; E-mail: [email protected].

Abstract

The short allele of the serotonin transporter linked polymorphic region (5-HTTLPR) moderates the effects of stress on vulnerability to mood and anxiety disorders. The mechanism by which this occurs may relate to differential sensitivity to stressful life events. Here we explored whether 5-HTTLPR and sex affected behavioral responses to repeated maternal separation in infant rhesus macaques. Behaviors were collected during the acute (Day 1) and the chronic (Days 2–4) phases of the separation, and the effects of duration of separation (acute vs. chronic), genotype (long/long vs. short allele), and sex (male vs. female) on behavioral responses were analyzed across four successive separations. Males increased their levels of locomotion with repeated maternal separation, whereas females exhibited an increase in frequency of self-directed behavior, a measure of “depression-like” behavior. The short-allele predicted increased environmental exploration, particularly during the chronic phase of social separation, indicative of higher arousal. In addition, the short-allele carriers were more likely to increase their levels of self-directed behavior during the chronic phase of separation, as a function of repeated exposures. These findings suggest that the short allele may increase reactivity to repeated, chronic stressors, leaving them more vulnerable to affective psychopathology, with females particularly vulnerable.

Type
Regular Articles
Copyright
Copyright © Cambridge University Press 2012

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