Researchers from the University of Barcelona and collaborators have pin-pointed forty genes that are associated with aggressive behaviors in humans and in mice.
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The study provides a deeper understanding of the genetic element underlying aggressive behavior and how the brain circuit is altered in cases of violent behavior.
Our study focuses on the biological basis of aggressiveness, i.e. those endogenous factors that tend to show certain antisocial behavior.”
Bru Cormand, Study Author
Cormand and team established that humans and mice shared a common genetic base when it came to violent behavior. Specifically, they found forty genes shared by the two species that increased the risk of aggressive behavior.
Co-author Fernàndez Castillo says the genes contribute to biological processes that are linked to the development and function of the central nervous system, to cellular communication and to the maintenance of cellular function.
Some genes are likely to function as important nodes of the genic networks prone to a violent behaviour, and those would be probably related to other genes which play a minor role. If any of those central genes is altered, it could affect the other genes and lead to the aggressive phenotype.”
Fernàndez Castillo, Study Co-Author
To study humans, the team analysed several studies to establish the genetic risk variants shared within the general population. They also analysed transcriptome data to find variations in genetic expression that are associated with aggressive phenotypes.
To study mice, they looked at the differential expression of genes between mice with and without aggressive behavior. By exploring the functional pathways involved in violent behaviors, the researchers were able to understand more about the molecular mechanisms behind aggression.
“The most relevant verification of the study is that many genes are related to aggressiveness according to the results of very different experimental methodologies, which strengthens the idea of those participating in the behaviour profile,” say Cormand and Castillo.
However, there is a significant environmental basis to aggressiveness, which Cormand says has not been taken into consideration in this study:
It would be interesting to combine genetic and environmental data from the same individuals to consider the interactions that can occur between the same risk factors that influence this kind of behavior.”