A Pilot Study Exploring PTSD Symptom Clusters as Mediators between Trauma Exposure and Attachment Behaviors in Married Adults

The Residuum of Childhood Physical and Sexual Abuse: Coming to Terms in Couple Relationships

Childhood exposure to physical violence and sexual abuse is a public health concern and is empirically connected to poor outcomes in adulthood. The present study was designed to assess dyadic associations between exposure to childhood physical violence and sexual abuse, and resolution, or a sense that one has "come to terms" with events in one's family of origin. The study was also aimed at assessing whether attachment behaviors mediated associations between abuse, violence, and resolution. The study was carried out using data from a community sample of 3,836 heterosexual couples who completed the Relationship Evaluation Questionnaire inventory. Actor-Partner Interdependence Modeling was employed within a structural equation model to examine associations. Results suggested inverse, direct actor associations for both men and women between physical violence and sexual abuse, and coming to terms. The results also showed inverse, direct partner associations for both men and women between sexual abuse and coming to terms. Furthermore, findings indicated the presence of inverse, indirect actor and partner effects for men and women between physical violence and coming to terms. Examination of these specific indirect partner and actor effects from physical violence to coming to terms implies partial mediation carried through one's own rating of attachment behaviors. Finally, actor (but not partner) associations were noted between attachment behaviors and coming to terms. In aggregate, the findings support the potential benefit of enhancing investment in attachment behaviors as a resource to aid in the resolution process of exposure to physical violence and sexual abuse in childhood.

Heterogeneous Mediation Analysis on Epigenomic PTSD and Traumatic Stress in a Predominantly African American Cohort

DNA methylation (DNAm) has been suggested to play a critical role in post-traumatic stress disorder (PTSD), through mediating the relationship between trauma and PTSD. However, this underlying mechanism of PTSD for African Americans still remains unknown. To fill this gap, in this article, we investigate how DNAm mediates the effects of traumatic experiences on PTSD symptoms in the Detroit Neighborhood Health Study (DNHS) (2008-2013) which involves primarily African Americans adults. To achieve this, we develop a new mediation analysis approach for high-dimensional potential DNAm mediators. A key novelty of our method is that we consider heterogeneity in mediation effects across subpopulations. Specifically, mediators in different subpopulations could have opposite effects on the outcome, and thus could be difficult to identify under a traditional homogeneous model framework. In contrast, the proposed method can estimate heterogeneous mediation effects and identifies subpopulations in which individuals share similar effects. Simulation studies demonstrate that the proposed method outperforms existing methods for both homogeneous and heterogeneous data. We also present our mediation analysis results of a dataset with 125 participants and more than 450,000 CpG sites from the DNHS study. The proposed method finds three subgroups of subjects and identifies DNAm mediators corresponding to genes such as HSP90AA1 and NFATC1 which have been linked to PTSD symptoms in literature. Our finding could be useful in future finer-grained investigation of PTSD mechanism and in the development of new treatments for PTSD.

Couple and parenting functioning of childhood sexual abuse survivors: a systematic review of the literature (2001-2018)

In this review, 55 unique empirical studies of the impacts of a history of CSA on couple and parenting functioning were identified and analyzed according to assumptions considered in an earlier review. Overall, this current systematic review supported earlier assumptions that CSA survivors would evidence insecure attachments in their adult couple relationships; that CSA survivors would be less likely to marry and more likely to divorce; and that partners would also experience difficulties in relation to their partnership with a CSA survivor. Assumptions about parenting functioning included: that CSA survivors would have different attitudes toward their children; that CSA survivors would function poorly as parents; and that children of CSA survivors would be at increased risk for sexual abuse. Evolutions in the literature since that first review included methodological improvements, as well as the inclusion of male survivors in some studies. More sophisticated statistical modeling allowed for a greater understanding of mediators and moderators in the relationship between CSA and later interpersonal functioning in couple relationships and in parenting. Recommendations for future research and clinical implications were proposed.