Groundbreaking research suggests genes help explain why some people can recover from a traumatic event while others suffer post-traumatic stress disorder.

Researchers found that specific variations in a stress-related gene appeared to be influenced by trauma at a young age — in this case child abuse. That interaction strongly increased the chances for adult survivors of abuse to develop signs of PTSD.

Among adult survivors of severe child abuse, those with the specific gene variations scored more than twice as high (31) on a scale of post-traumatic stress, compared with those without the variations (13).

The worse the abuse, the stronger the risk in people with those gene variations.

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