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Commentary
Published Online: 1 November 2007

Disturbed Relationships as a Phenotype for Borderline Personality Disorder

Factor analytic studies describe three sectors of borderline personality disorder psychopathology: affective, behavioral, and interpersonal (1) . The first two of these sectors, affective instability and impulsivity, have been conceptualized as major underlying phenotypes (i.e., for dispositions having significant heritability) (2) . Borderline personality disorder’s third sector of psychopathology, disturbed relationships, has traditionally been conceptualized as environmentally determined, i.e., as learned behaviors. However, these relationship characteristics are central to the clinical problems (e.g., regressions, psychotic transferences, manipulativeness, boundary problems, and countertransference reactions), as well as to major dynamic (3, 4) and cognitive (5, 6) theories and therapies. To reconceptualize these relationship phenomena as reflective of a third major phenotype would represent a paradigm shift that is the thesis of this editorial.

Does Borderline Personality Disorder Have a Characteristic Interpersonal Style?

The relational style of someone with borderline personality disorder is characterized in the DSM-IV borderline personality disorder criteria as intense and unstable, marked further by abandonment fears and by vacillating between idealization and devaluation. These characteristics have offered the best discriminators for the diagnosis (7) . They mirror two prototypic variations of insecure attachments: the “preoccupied” form of attachment marked by pleas for attention or help, clinging, and checking for proximity alternating with the “unresolved/fearful” (“disorganized” in children) form of attachment, which is marked by denial, confusion, or fearfulness about dependency (8, 9) .

Is Borderline Personality Disorder’s Interpersonal Style Familial?

Zanarini et al. (10) used family history methods to compare 341 borderline personality disorder probands with 1,580 first-degree relatives to a sample of 104 with other personality disorders and their 472 first-degree relatives. Among relatives with borderline personality disorder, 27.5% had borderline personality disorder’s particular style of disturbed interpersonal relationships, compared to 17.2% of the relatives of persons with other personality disorders (p=0.002). This degree of familiality was very similar to that shown for borderline personality disorder’s affective instability and impulsivity phenotypes.

Is Borderline Personality Disorder’s Relationship Style Heritable?

To date, the heritability of the specific borderline personality disorder disturbed interpersonal style per se has not been tested in patients with borderline personality disorder. Livesley and colleagues (11, 12) examined heritability for different forms of attachment as measured by self-report. Although the nonshared environment still accounted for most of the variance, the secure style of attachment had a heritability of 0.37, and the fearful and preoccupied styles of insecure attachment—those which, as noted above, characterize borderline personality disorder—had a heritability of 0.43 and 0.25, respectively. A fourth style, dismissive, showed no evidence for heritability. Of further note, a scale related to the borderline patients’ prototypic intolerance of aloneness had a heritability of 0.48.

Candidate Psychological Endophenotypes

Two psychological endophenotypes (which may be closely related), i.e., mentalization failures and rejection sensitivity, offer bridges from the neurobiology of relationships to the more specific interpersonal handicaps of borderline personality disorder.

Mentalization Failure

Mentalization refers to the ability to recognize feelings and intentions in one’s self and in others. Fonagy et al. (13) postulated, based on observations of early mother-child interactions, that an inability to mentalize and the consequent reemergence of more primitive mental states is the core psychological deficit of patients with borderline personality disorder. This theory has gained widespread clinical influence because it has generated a particular form of psychotherapy, i.e., mentalization-based therapy, which has proven effective for patients with borderline personality disorder (4) .

Rejection Sensitivity

Rejection sensitivity is a trait closely related to abandonment fears and intolerance of aloneness, which have a long association with borderline personality disorder (14) . This trait has been demonstrated in patients with borderline personality disorder by their hypersensitivity to feeling states in others’ faces and by their particularly high sensitivity (and physiological reactivity) to angry faces or to abandonment scripts (15) . Possibly related to the rejection sensitivity trait is evidence that the states of intense aversive tension (i.e., dysphoric negative emotional states) that characterize patients with borderline personality disorder and that frequently prompt dissociation and self-injurious behaviors are often prompted by aversive interpersonal events, such as rejecting criticisms or aloneness (16) .

Clinical Implications

The “personality-event congruence hypothesis,” which posits that people who have an insecure relational phenotype experience stressful interpersonal events more drastically, has been confirmed in that interpersonally preoccupied or needy people are more disposed to respond to interpersonal stressors by becoming depressed (17) . Thus, the proposed interpersonal phenotype for borderline personality disorder might also be a diathesis for some types of depressive disorder that could explain the high rate of major depressive disorder and borderline personality disorder co-occurrence—the occurrence of borderline personality disorder depending on an individual also having a diathesis for affective instability or impulsivity .
The existence of a disturbed relational phenotype in patients with borderline personality disorder needs to be reconciled with the etiological significance usually assigned to their dysfunctional families and to familial neglect and abuse. This article’s thesis does not exonerate the causal role of such family interactions. Indeed, much—perhaps most—of the cause for the typically disturbed relationships of subjects with borderline personality disorder is still likely to remain in the unshared environment. It does mean that dysfunctional families, as well as abuse and neglect, are neither necessary nor sufficient explanations. Moreover, it reminds clinicians that although any offsprings’ reconstruction of their past parenting should not be presumed to be valid, this is especially true for patients with borderline personality disorder, whose typically devaluative accounts of their parents likely are colored by their wish for supportive attention, by their genetically influenced tendency to overgeneralize, and by what we here suggest is a genetically influenced hypersensitivity to—or inability to accurately mentalize—parental interactions (e.g., absence, limits). A phenotype marked by high interpersonal reactivity could be expected to have influenced the actual parenting in ways that accentuated rather than minimized the disposition of subjects with preborderline personality disorder for this particular disorder.
The existence of a relational phenotype helps explain the effectiveness of psychosocial treatment interventions for borderline personality disorder (18, 19) . Insofar as social learning experiences determine whether individuals with this phenotypic disposition do or do not go on to develop borderline personality disorder, the existence of an interpersonal phenotype actually can help explain why psychosocial interventions can have powerful effects. This article’s thesis can also help everyone involved with borderline patients—including borderline patients themselves—understand that the recurrent interpersonal problems they have with families, lovers, or treaters are constitutionally ingrained maladaptive habits. Understanding this provides a conceptualization from which families, lovers, and treaters can learn less provocative, more palliative ways of responding.

Footnotes

Address correspondence and reprint requests to Dr. Gunderson, McLean Hospital, Harvard Medical School, 210 Administration, 115 Mill St., Belmont, MA 02478; [email protected] (e-mail). Editorial accepted for publication July 2007 (doi:10.1176/appi.ajp.2007.07071125).
The author reports no competing interests.
Supported by NIMH grant MH400130.
The author thanks Peter Fonagy, Ph.D., and Larry Siever, M.D., for their input.

References

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Go to American Journal of Psychiatry
Go to American Journal of Psychiatry
American Journal of Psychiatry
Pages: 1637 - 1640
PubMed: 17974925

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Published online: 1 November 2007
Published in print: November, 2007

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John G. Gunderson, M.D.

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