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:
Most people with borderline personality disorder have a biological defect in the way they regulate mood and emotion. The amygdala, a device in the brain, helps us to regulate our negative emotions. People with borderline personality disorder have amygdalas that do not function properly. In these cases it is thought that a front portion of the brain may be dampening the effect of the amygdala, causing severe mood swings and abnormal behavior. Symptoms of Borderline Personality Disorder. There are numerous borderline personality disorder symptoms.