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The Resident-intruder Paradigm: A Standardized Test for Aggression, Violence and Social Stress
Published on: July 4, 2013
Aggressive behavior, related conduct problems, and variation in genes affecting dopamine turnover
Elena L Grigorenko1, Colin G De Young, Maria Eastman
1Yale University Child Study Center, New Haven, Connecticut 06519, USA. elena.grigorenko@yale.edu
Aggressive Behavior
|February 4, 2010
Summary
Genetic combinations, not single variants, predict conduct disorder and incarceration in male adolescents. This highlights the importance of studying gene interactions for understanding complex behaviors.
Area of Science:
- Neurogenetics
- Behavioral Genetics
- Forensic Psychiatry
Background:
- Dopamine (DA) related genes are linked to conduct problems and violent behavior.
- Enzymes influencing dopamine turnover are of particular interest in genetic studies of behavior.
- Previous research has focused on single gene variants, with limited success in explaining complex behaviors.
Purpose of the Study:
- To investigate the association between genetic polymorphisms in dopamine-related genes and conduct problems in male adolescents.
- To examine the role of single nucleotide polymorphisms (SNPs) and their combinations (haplotypes and interactions) in predicting incarceration and conduct disorder.
- To explore the genetic underpinnings of violent versus nonviolent criminal behavior.
Main Methods:
- Genotyping of 12 genetic polymorphisms in four dopamine-related genes (COMT, MAOA, MAOB, DbetaH).
- Study included 179 incarcerated Russian male adolescents and two control groups (n=182 "troubled-behavior-free", n=60 "troubled-behavior").
- Participants were assessed for incarceration status, DSM-IV Conduct Disorder (CD), and crime type (violent/nonviolent).
Main Results:
- No single genetic variant consistently differentiated the study groups.
- Haplotypes and gene-gene interactions, but not single variants, significantly classified individuals based on incarceration status and CD diagnosis.
- No consistent genetic combinations were found to differentiate between violent and nonviolent crimes.
Conclusions:
- Complex behaviors like conduct disorder are better explained by combinations and interactions of multiple genetic variants rather than single markers.
- Future research should consider gene-gene and gene-environment interactions to understand the genetic basis of serious conduct problems.
- Investigating gene combinations offers a more robust approach to identifying genetic predispositions for behavioral issues.
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