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Related Experiment Videos

Gender specific gene-environment interactions on laboratory-assessed aggression.

Edelyn Verona1, Thomas E Joiner, Frank Johnson

  • 1Department of Psychology, University of Illinois at Urbana-Champaign, 603 E. Daniel Street, Champaign, IL 61820, USA. everona@cyrus.psych.uiuc.edu

Biological Psychology
|December 20, 2005
PubMed
Summary

Gene-environment interactions influence aggression. Men with the short serotonin transporter gene (s/s genotype) exhibited more aggression under stress, unlike women or men with the long allele.

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Area of Science:

  • Behavioral Neuroscience
  • Genetics
  • Psychology

Background:

  • Serotonin transporter gene (5-HTTLPR) polymorphism is linked to behavioral traits.
  • Gene-environment interactions are crucial for understanding complex behaviors like aggression.
  • Previous research suggests a role for the serotonin system in aggression and stress response.

Purpose of the Study:

  • To investigate the interactive effects of serotonin transporter gene (5-HTTLPR) genotype and stress on aggressive behavior in men and women.
  • To examine physiological responses (startle reactivity) as a mediator or moderator of these effects.
  • To replicate and extend findings on gene-environment interplay in behavioral reactivity.

Main Methods:

  • Participants were genotyped for the serotonin transporter gene (short/long alleles).

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  • Aggressive behavior was measured using a laboratory task involving administering electric shocks.
  • Participants were exposed to either a physical stressor or a no-stress condition.
  • Physiological responses were assessed via acoustic startle eyeblink reactions.

    • Main Results:

    • Men with the homozygous short (s/s) genotype displayed significantly increased aggression exclusively under the stress condition.
    • Women and men carrying at least one long allele (s/l or l/l genotypes) did not show stress-dependent differences in aggression.
    • Stress exposure increased startle reactivity across all participants, but no significant genotype or gender differences in physiological responses were observed.

    Conclusions:

    • The findings confirm gene-environment interactions, specifically the 5-HTTLPR genotype and stress, significantly impact aggressive behavior, particularly in men.
    • These results support the role of environmental factors in modulating the genetic predisposition to aggression.
    • The study highlights the importance of considering both genetic and environmental contexts in the development of externalizing psychopathological syndromes.