Whether or not you experience post-traumatic stress disorder (PTSD) after a catastrophic event may depend on your genetics.
Researchers at the University of California, Los Angeles, studied 200 people from 12 multi-generational families who experienced a terrible earthquake in Armenia in 1988. Everyone in the study saw buildings destroyed, and over 90% saw dead bodies and severely injured people left lying in the streets.
According to the report published in
Psychiatric Genetics, about 40% of post-traumatic stress syndromes developed by people in the study was due to genetic factors. Genetic factors accounted for 61% of depression and 66% of anxiety. Dr. Armen Goenjian of the UCLA Duke University National Center for Child Traumatic Stress and lead author said that other studies have shown that depression tends to coexist with anxiety.
"Our findings show that a substantial portion of the coexistence can be explained on the basis of shared genes and not just environmental factors such as upbringing," he said. "This was a study of multigenerational family members - parents and offspring, grandparents and grandchildren, siblings and so on, and we found that the genetic makeup of some of these individuals renders them more vulnerable to develop PTSD, anxiety and depression."
Dr. Goenjian also pointed out that it is hard to do family studies on PTSD because typically whole families do not experience a single stressful event together.
Labels: stress, genetics, trauma
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