It Runs in Families: Heritability, Biology, and/or Environmental Influences
Heritability (a genetic predisposition) estimates of BPD ranges: 50-60%:
Consistent with studies on the heritability of personality traits broadly.
Prevailing view is that it is the traits or trait clusters (Emotional Instability, Behavioral Instability, and Disturbed Interpersonal Relatedness), rather than the disorder itself, that is heritable.
(Barbara Stanley, “Unraveling (some of) The Mystery of Borderline Personality Disorder Have we been barking up the wrong tree?” [most recent citation 2010]— Barbara Stanley, Ph.D., Director, Suicide Intervention Center Director, Suicide Intervention Center Professor of Clinical Psychology Professor of Clinical Psychology Department of Psychiatry Columbia University, Slide 27, Slide 6)
“Genetic causes for BPD were largely ignored until the first significant twin study estimated its heritability at 69% about 17 years ago (Torgersen et al., 2000). Subsequent research has lowered this estimate, but convincingly confirms that BPD’s heritability accounts for more than half the variance in whether BPD develops (Distel et al., 2010; Gunderson et al., 2011; Kendler et al., 2011). As noted earlier, this research has also confirmed an underlying unifying common pathway genetic model. This research now requires theories about BPD’s core to account for the major role played by genes and to propose what the nature of the unifying genetic disposition is….In summary, the theories are highly diverse in their efforts to integrate BPD’s genetic disposition. Although both excessive emotionality and excessive aggression might logically be considered as promising candidates for BPD’s genetic disposition, this perspective has not been adopted by the theories. The Excessive Anger, Emotional Dysregulation [with its Biosocial theory], and Failed Mentalization theories all identify top-down cortical failures of organization, perception, or regulation as BPD’s core. Of these, only the Failed Mentalization theory has undertaken efforts to incorporate BPD’s genetics, but the nature of what comprises this genetic determination remains unresolved. The Excessive Aggression theory stands alone in seeing a conflictual, rather than deficit, core for BPD. The Interpersonal Hypersensitivity theory stands alone in seeing BPD’s core as genetic.”
John G. Gunderson, Alan Fruzzetti, Brandon Unruh, and Lois Choi-Kain, “Competing Theories of Borderline Personality Disorder “Journal of Personality Disorders, 32(2), 148-167,2018.
*What does it mean if a disorder seems to run in my family?
“A particular disorder might be described as ‘running in a family’ if more than one person in the family has the condition. Some disorders that affect multiple family members are caused by gene mutations, which can be inherited (passed down from parent to child). Other conditions that appear to run in families are not caused by mutations in single genes. Instead, environmental factors such as dietary habits or a combination of genetic and environmental factors are responsible for these disorders.
It is not always easy to determine whether a condition in a family is inherited. A genetics professional can use a person’s family history (a record of health information about a person’s immediate and extended family) to help determine whether a disorder has a genetic component. He or she will ask about the health of people from several generations of the family, usually first-, second-, and third-degree relatives.”