No prior controlled experimental studies have tested if the MAOA gene directly drives aggressive behavior. 

MAOA gene and aggression 

Subjects with low activity MAOA (MAOA-L_ exhibited higher levels of aggression when provoked.

Low MAOA and aggression 

The Monoamine Oxide gene is nicknamed warrior gene which is linked to aggression  that was seen in survey based studies and observations 

University of Minnesota

MAOA Gene and psychiatric disorders 

McDermott, R.,  Tingley, D., &  Cowden, J. (2009a, February 17). Monoamine oxidase A gene (MAOA) predicts behavioral aggression following provocation. https://www.pnas.org/ 

Monoamine oxidase A gene (MAOA) predicts behavioral aggression following provocation

MAOA Gene "warrior gene" 

MAOA gene is linked to antisocial behavior and delinquency, with previous studies suggesting that it may moderate the impact of childhood abuse on the development of aggression.

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