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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.
The 2 main types of genes that play a role in cancer are oncogenes and tumor suppressor genes. Oncogenes Most oncogenes are mutations of certain normal genes called proto-oncogenes. Proto-oncogenes are the good genes that normally control what kind of cell it is and how often it divides. When a