![]() ![]() Additionally, several other moderately powered GWAS have begun to identify genome-wide level significant findings ( Guffanti et al, 2013 Logue et al, 2013 Nievergelt et al, 2015). The genomics of PTSD is more nascent, and it is too early to tell which trajectory this disorder will have with regards to genetic contribution, though twin studies suggest up to 40% heritability. In contrast to the successful genetic studies for schizophrenia or bipolar disorder ( Schizophrenia Working Group of the Psychiatric Genomics Consortium, 2014 Muhleisen et al, 2014), studies on depression so far have failed to identify reliable genetic markers at sample sizes at which first loci in schizophrenia were identified ( Major Depressive Disorder Working Group of the Psychiatric GWAS Consortium, 2012). Although much effort is spent on studies investigating the genetic basis of psychiatric disorders and outstanding emerging studies point toward a polygenic risk to disease ( Schizophrenia Working Group of the Psychiatric Genomics Consortium, 2014), the overall contribution of genetic factors appears to be rather small in particular for stress and fear disorders based on our current knowledge ( Major Depressive Disorder Working Group of the Psychiatric GWAS Consortium, 2012 Sullivan et al, 2012 Wray et al, 2012 Lee et al, 2013 Levinson et al, 2014). It is widely accepted that environmental and genetic factors contribute to the development of psychiatric disorders. ![]() Our understanding of the molecular mechanisms of risk and resilience for disease is pivotal for the development of effective preventative and therapeutic strategies that are superior to the currently available limited therapies. Additionally, stress-related disorders demand increasing medical and economical resources and are predicted to become the leading cause of disability worldwide in the near future ( Wittchen et al, 2011 Whiteford et al, 2013). Changing environmental conditions with respect to not only socioeconomic status, social interactions, trauma exposure, and workload, but also nutritional status, may contribute to this phenomenon and thus potentially lead to a self-reinforcing risk for disease. ![]() The pervasiveness of these disorders is increasing in the public perception and recent studies support this view, although there is some controversy with regard to the underlying causes ( Heimberg et al, 2000 Kessler et al, 2005 Compton et al, 2006 Hidaka, 2012). Stress-related psychiatric disorders such as major depression, posttraumatic stress disorder (PTSD), and other anxiety disorders are highly prevalent in the general population ( Kessler et al, 2005), with an even higher prevalence in military and socioeconomically disadvantaged populations ( Hoge et al, 2004 Gillespie et al, 2009). ![]()
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