Final answer:
The gene-environment interaction between MAOA and conduct symptoms involves a complex interplay between genetics and environment. Certain variants of the MAOA gene are associated with an increased risk of aggressive and antisocial behavior. However, the impact of this gene on behavior is highly influenced by the individual's environment.
Step-by-step explanation:
The gene-environment interaction between monoamine oxidase A (MAOA) and conduct symptoms in humans is a complex interplay between genetics and environmental factors that can influence the development of conduct disorder. MAOA is an enzyme that breaks down neurotransmitters such as serotonin and dopamine in the brain.
Research has shown that certain variants of the MAOA gene, specifically the low-activity variant, are associated with an increased risk of aggressive and antisocial behavior. However, the impact of this gene on behavior is highly dependent on the individual's environment.
For example, individuals with the low-activity variant of MAOA may be more susceptible to the negative effects of childhood abuse or maltreatment, which can increase the likelihood of developing conduct symptoms. Conversely, individuals with the high-activity variant of MAOA may be less affected by adverse environmental factors.