MAOA gene link to aggression

• MAOA gene linked to aggressive behaviour
• Monoamine oxidise is an enzyme involved in processing neurotransmitters including serotonin in the brain
• MAOA gene controls production of MAOA
• Some versions of gene result in lower levers of MAOA gene linked to aggression
• Brunner et al found in extended family in the Netherlands where several male family showed patterns of behaviour involving impulsive aggression including violent crime
• Studies on mice have found a similar relationship between MAOA gene variations and aggression
• Cases et al (1995) found adult male mice who were missing the MAOA-producing gene had specific behaviour patterns which included heightened aggression