Do DSM-5 Section II personality disorders and Section III personality trait domains reflect the same genetic and environmental risk factors?

T. Reichborn-Kjennerud, R. F. Krueger, E. Ystrom, F. A. Torvik, T. H. Rosenström, S. H. Aggen, S. C. South, M. C. Neale, G. P. Knudsen, K. S. Kendler, N. O. Czajkowski

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Background DSM-5 includes two conceptualizations of personality disorders (PDs). The classification in Section II is identical to the one found in DSM-IV, and includes 10 categorical PDs. The Alternative Model (Section III) includes criteria for dimensional measures of maladaptive personality traits organized into five domains. The degree to which the two conceptualizations reflect the same etiological factors is not known. Methods We use data from a large population-based sample of adult twins from the Norwegian Institute of Public Health Twin Panel on interview-based DSM-IV PDs and a short self-report inventory that indexes the five domains of the DSM-5 Alternative Model plus a domain explicitly targeting compulsivity. Schizotypal, Paranoid, Antisocial, Borderline, Avoidant, and Obsessive-compulsive PDs were assessed at the same time as the maladaptive personality traits and 10 years previously. Schizoid, Histrionic, Narcissistic, and Dependent PDs were only assessed at the first interview. Biometric models were used to estimate overlap in genetic and environmental risk factors. Results When measured concurrently, there was 100% genetic overlap between the maladaptive trait domains and Paranoid, Schizotypal, Antisocial, Borderline, and Avoidant PDs. For OCPD, 43% of the genetic variance was shared with the domains. Genetic correlations between the individual domains and PDs ranged from +0.21 to +0.91. Conclusion The pathological personality trait domains, which are part of the Alternative Model for classification of PDs in DSM-5 Section III, appears to tap, at an aggregate level, the same genetic risk factors as the DSM-5 Section II classification for most of the PDs.

Original languageEnglish (US)
Pages (from-to)2205-2215
Number of pages11
JournalPsychological medicine
Volume47
Issue number12
DOIs
StatePublished - Sep 1 2017

Keywords

  • DSM-5
  • Key words Assessment
  • personality disorder
  • personality traits
  • twins

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