Key points: 1  DNA cloning is a molecular biology technique that makes many identical copies of a piece of DNA, such as a gene. 2  In a typical cloning experiment, a target gene is inserted into a circular piece of DNA called a plasmid.
1 Some studies of twins and families suggest that personality disorders may be inherited or strongly associated with other mental disorders among family members. 2  Brain abnormalities. 3  Some research has shown changes in certain areas of the brain involved in emotion regulation, impulsivity and aggression.auses. As with other mental disorders, the causes of borderline personality disorder aren't fully understood. In addition to environmental factors â such as a history of child abuse or neglect â borderline personality disorder may be linked to:
Because 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.Researchers have found that personality disorders develop from a combination of genes and environmental effects on personality traits.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.