Genes And Environment May Interact To Influence Risk For Post-traumatic Stress Disorder

Individuals who experience both childhood adversity and traumatic events in adulthood appear more likely to develop post-traumatic stress disorder than those exposed to only one of these types of incidents, according to a report in the November issue of Archives of General Psychiatry, one of the JAMA/Archives journals. In addition, the risk was further increased in individuals with a certain genetic mutation.

Although 40 percent to 70 percent of Americans have experienced traumatic events, only about 8 percent develop PTSD during their lifetimes, according to background information in the article. PTSD is a complex anxiety disorder that involves re-experiencing, avoidance and increased arousal following exposure to a life-threatening event. "In addition to the obvious effect of environmental factors, PTSD has a heritable component," the authors write. Recent studies estimate that genetic factors account for approximately 30 percent of the difference in PTSD symptoms.

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