Which gene variant might be linked to aggressive behaviors in psychological studies?

The MAOA gene, particularly when mutated, has been linked to aggressive behaviors in various psychological studies. This gene is responsible for producing monoamine oxidase A, an enzyme that breaks down neurotransmitters such as serotonin, dopamine, and norepinephrine in the brain. Abnormalities or mutations in this gene can lead to an imbalance in these neurotransmitters, which are crucial for regulating mood and behavior.

Research has shown that individuals with certain variants of the MAOA gene may exhibit higher tendencies toward aggression and impulsivity. For instance, studies involving individuals from different backgrounds have found that those with the low-activity variant of the MAOA gene exhibit more aggressive behaviors, especially when combined with adverse environmental factors, such as childhood maltreatment.

The other gene variants mentioned do not have a direct and widely recognized link to aggressive behaviors in the same manner. While the AAG gene, SERT gene, and CYP1A2 gene play roles in various biological functions and psychological traits, there is not significant evidence establishing a strong connection to aggression specifically like that of the mutated MAOA gene.