Psychiatric disorders including major depressive disorder, drug addiction, and
schizophrenia are debilitating illnesses with a multitude of complex symptoms underlying
each of these disorders. In recent years, it has become appreciated that the onset and
development of these disorders goes beyond the one gene–one disease approach. Rather,
the involvement of many genes is likely linked to these illnesses, and regulating the
activation or silencing of gene function may play a crucial role in contributing to their …