A recent study of multigenerational family members initially exposed to trauma has suggested that the genetic makeup of some individuals makes them more vulnerable to PTSD, depression and anxiety. This study suggested that around 40% of variation shown in PTSD sufferers was acountable in terms of gentic factors and the balance attributable to nongenetic factors. This study also went on to suggest that those suffering from one disorder, such as PTSD,  are also more likely due to genetic factors to suffer from the other two disorders, depression and anxiety.

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