Original title: Identifying differential interactions of potentially traumatic experiences with genetic risk for posttraumatic stress disorder
Jacob Knyspel, Saakshi Kakar, Anna Carnegie, Gursharan Kalsi +10 · September 2026
Posttraumatic stress disorder, or PTSD, can develop after someone goes through a terrifying event, but it does not affect everyone who faces trauma. A person's genes help shape how they respond to traumatic experiences. This interplay between DNA and life events is called gene-environment interactionWhen the effect of your genes on a trait depends on an experience you have.. Researchers wanted to know if this genetic response changes depending on the specific type of trauma someone faces across their life. They looked at people who reported different traumatic events from childhood or adulthood and measured how these events interacted with genetic risk. They discovered that childhood traumas had stronger links to PTSD symptoms and sparked greater gene-environment interactions than adulthood traumas. Specifically, childhood neglect showed larger gene-environment interactions than childhood abuse. Furthermore, certain genes interacted much more strongly with specific traumas, while other genes reacted across all childhood or adulthood events. Trauma type truly shapes how our genes influence PTSD risk.
You get the same flu shot as everyone else. For some people it works perfectly; for others it barely helps. Now imagine the vaccine was given in two different years. The year itself changes how well the shot works—even if the dose is the same. In this paper, the flu shot is a person's genetic makeup, and the year is the type of trauma they experienced. Childhood traumas amplify genetic risk more than adulthood traumas.
This study matters for anyone who has experienced trauma, especially in childhood, and for clinicians trying to predict who is most at risk. It shows that the type of trauma changes how strongly genes influence PTSD. That means prevention and treatment can be tailored based on both a person's genetics and their trauma history.
The study relies on self-reported trauma experiences, which may be subject to recall bias. The sample is from two UK cohorts, so findings may not generalize to other populations. PTSD symptoms were assessed with a six-item checklist rather than a full clinical interview. The analyses are observational and cannot establish causal relationships between trauma type and genetic interactions. Additionally, the specific genetic variants and genes highlighted require replication in independent samples.
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Identifying differential interactions of potentially traumatic experiences with genetic risk for posttraumatic stress disorder — Jacob Knyspel, Saakshi Kakar, Anna Carnegie et al. — European journal of psychotraumatology — doi:10.1080/20008066.2026.2709319
Abstract licence: CC BY
Explanation generated by Synthesis from the abstract — it is not the original paper.