Do you mean Warrior Gene?

This is monoamine oxidase A-low activity (MAOA-L). It is located on X-chromosome. its presence in men is linked to aggressive and violent behavior, particularly when provoked or challenged. This gene variant may be present in 30-40% of male population. Its high activity variant is MAOA-H.

Monoamine oxidase enzyme catalyzes the catabolism of serotonin and norepinephrine.

The so called “warrior gene” is the R2 variant of MAOA gene. This variant is of low activity, meaning that it produces less of the protein “monoamine oxidase”. This protein is an enzyme that catalyzes inactivation of the neurotransmitters catecholamines and serotonin. Therefore, low activity of the gene is postulated to cause an increase of the levels of dopamine and norepinephrine. Some studies have linked this condition to increased aggression upon provocation.

The pitfall here is declaring aggressors to be not responsible for their action. Lawyers could use this argument in favor of their clients who committed violent crimes. In a 2009 criminal trial in the United States, an argument based on a combination of “warrior gene” and history of child abuse was successfully used to avoid a conviction of first-degree murder and the death penalty.
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• This reply was modified 1 year, 11 months ago by BioHub.
• This reply was modified 1 year, 11 months ago by BioHub.