In contrast to conditions such as Parkinson's Disease that are caused by a single gene, increasingly, data suggest that virtually all psychological traits and disorders are caused by a combination of many genetic and environmental risk factors. Moreover, it is likely that many of these genes increase risk for more than one disorder, suggesting that the boundaries between putatively distinct diagnoses may prove to be blurry. Behavioral and molecular genetic methods will provide an essential tool to improve the nosology of psychiatric diagnoses by revealing the common and unique risk factors that contribute to the development of complex disorders.
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