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Researchers do know from twin studies that genetics plays a role in personality disorders. Environmental factors, such as childhood abuse, neglect and separation from caregivers, as well as brain abnormalities, emotion regulation, impulsivity, aggression and serotonin levels all play a role.ecause many personality domains are heritable, borderline personality disorder may be a result of a genotype interacting with adverse environmental factors. This would in turn lead to the expression of borderline symptoms or other dysfunctional personality traits.
Normal Function. The ATM gene provides instructions for making a protein that is located primarily in the nucleus of cells, where it helps control the rate at which cells grow and divide. This protein also plays an important role in the normal development and activity of several body systems, including the nervous system and the immune system.