title: Gene-environment interaction between peer victimization and child aggression.
abstract: Although peer victimization places children at serious risk for aggressive behavior, not all victimized children are aggressive. The diathesis-stress hypothesis of disease proposes that an environmental stressor such as peer victimization should to lead to maladjustment mostly in those individuals with preexisting genetic vulnerabilities. Accordingly, this study examined whether the link between peer victimization and child aggression is moderated by children's genetic risk for such behavior. Using a sample of 506 6-year-old twins, peer victimization was assessed through peer nominations and aggressive behavior was assessed through peer and teacher reports. Children's genetic risk for aggression was estimated as a function of their co-twin's aggression and the pair's zygosity. Genetic modeling showed that peer victimization is an environmentally driven variable that is unrelated to children's genetic disposition. Results also provided support for the notion of a gene-environment interaction between peer victimization and child's genetic risk for aggressive behavior, albeit only in girls. For boys, peer victimization was related to aggression regardless of the child's genetic risk for such behavior. Different socialization experiences in girls' compared to boys' peer groups may explain the different pattern of results for girls and boys.
authors.affiliation: Department of Psychology, University of Québec at Montreal, CP 8888, Succ. Centreville, Montréal, Québec H3C 3P8, Canada. Brendgen.Mara@uqam.ca
authors.forename: Mara
authors.initials: M
authors.lastname: Brendgen
authors.forename: Michel
authors.initials: M
authors.lastname: Boivin
authors.forename: Frank
authors.initials: F
authors.lastname: Vitaro
authors.forename: Alain
authors.initials: A
authors.lastname: Girard
authors.forename: Ginette
authors.initials: G
authors.lastname: Dionne
authors.forename: Daniel
authors.initials: D
authors.lastname: Pérusse
mesh_terms: D000328:Adult; D000374:Aggression / Q000523:psychology*; D002675:Child, Preschool; D019548:Crime Victims / Q000523:psychology; D004200:Diseases in Twins / Q000235:genetics* / Q000523:psychology*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics / Q000523:psychology; D005838:Genotype; D006801:Humans; D007206:Individuality; D007223:Infant; D008137:Longitudinal Studies; D008297:Male; D010379:Peer Group; D010552:Personality Assessment; D010641:Phenotype; D012307:Risk Factors; D012737:Sex Factors; D012931:Social Environment; D012963:Sociometric Techniques; D014429:Twins, Dizygotic / Q000235:genetics / Q000523:psychology; D014430:Twins, Monozygotic / Q000235:genetics / Q000523:psychology