SLC6A3 Is Associated With Relational Aggression in Children

Abstract. Understanding the genetic influence on aggressive behavior in children is one way to understand pathways to the development of aggression in adults. While aggression is likely under some environmental influence, it is also likely under some genetic influence. Overt aggression associates with a variety of genes including dopaminergic and serotonergic genes. Dopaminergic and serotonergic genes are known to be associated with overt aggression. However, little is known regarding the genetic pathways associated with relational aggression. Detecting genetic associates of relational aggression is important to eventually understand pathways to socially aggressive behaviors in children. Therefore, we attempted to determine if relational aggression was also associated with dopaminergic and serotonergic genes. We invited the parents of 327 children to complete a modified version of the MacArthur Health and Behavior Questionnaire (HBQ-P), which has a subscale for relational aggression. We used logistic regression models that predicted relational aggression after controlling for covariates. One genetic predictor was added at a time until there was no model improvement. The covariates were overt aggression scores obtained from the HBQ-P and age. The final (best) model included as a significant predictor of relational aggression one single nucleotide polymorphisms (SNP) on SLC6A3 (rs2617605) and the covariates.

Aggression and polymorphisms in AR, DAT1, DRD2, and COMT genes in Datoga pastoralists of Tanzania

The aim of this study was to analyse the relationships between polymorphisms in four candidate genes (AR, DAT1, DRD2, and COMT) and aggression in men from a traditional society of East African pastoralists, the Datoga. Buss and Perry's Aggression Questionnaire was used to measure aggression. The number of CAG repeats in the AR gene was negatively correlated with physical aggression, anger, and hostility. Among the genes of the dopaminergic system, a significant single-gene effect was detected only for DRD2 with regard to anger. At the level of a two-gene model, a significant effect for DRD2 and a tendency for DAT1 were observed for the DAT1-DRD2 gene pair regarding hostility, and two tendencies were observed for the interaction effect of the DAT1-COMT pair regarding anger and hostility. These data suggest a probable link between physical aggression and direct fitness caused by strong sexual selection in Datoga men.