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A putative causal relationship between genetically determined female body shape and posttraumatic stress disorder.

  • Author(s): Polimanti, Renato
  • Amstadter, Ananda B
  • Stein, Murray B
  • Almli, Lynn M
  • Baker, Dewleen G
  • Bierut, Laura J
  • Bradley, Bekh
  • Farrer, Lindsay A
  • Johnson, Eric O
  • King, Anthony
  • Kranzler, Henry R
  • Maihofer, Adam X
  • Rice, John P
  • Roberts, Andrea L
  • Saccone, Nancy L
  • Zhao, Hongyu
  • Liberzon, Israel
  • Ressler, Kerry J
  • Nievergelt, Caroline M
  • Koenen, Karestan C
  • Gelernter, Joel
  • Psychiatric Genomics Consortium Posttraumatic Stress Disorder Workgroup
  • et al.
Abstract

BACKGROUND:The nature and underlying mechanisms of the observed increased vulnerability to posttraumatic stress disorder (PTSD) in women are unclear. METHODS:We investigated the genetic overlap of PTSD with anthropometric traits and reproductive behaviors and functions in women. The analysis was conducted using female-specific summary statistics from large genome-wide association studies (GWAS) and a cohort of 3577 European American women (966 PTSD cases and 2611 trauma-exposed controls). We applied a high-resolution polygenic score approach and Mendelian randomization analysis to investigate genetic correlations and causal relationships. RESULTS:We observed an inverse association of PTSD with genetically determined anthropometric traits related to body shape, independent of body mass index (BMI). The top association was related to BMI-adjusted waist circumference (WCadj; R = -0.079, P < 0.001, Q = 0.011). We estimated a relative decrease of 64.6% (95% confidence interval = 27.5-82.7) in the risk of PTSD per 1-SD increase in WCadj. MR-Egger regression intercept analysis showed no evidence of pleiotropic effects in this association (Ppleiotropy = 0.979). We also observed associations of genetically determined WCadj with age at first sexual intercourse and number of sexual partners (P = 0.013 and P < 0.001, respectively). CONCLUSIONS:There is a putative causal relationship between genetically determined female body shape and PTSD, which could be mediated by evolutionary mechanisms involved in human sexual behaviors.

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