The article provides the overview of the literature concerning genetic investigations of single phenotypic traits of schizophrenia («dimensions») – positive symptoms, negative symptoms and disorganization. The analysis of phenotypic traits heritability in family and the results of the molecular genetic studies show that the negative symptoms of schizophrenia and disorganization are heritable to a greater extent compared to delusions and hallucinations and can be determined by the so-called «modifier-genes». Search for the new «modifier-genes» in the context of schizophrenia dimensional model may contribute to better understanding of disease nature and to discover new potentially modifiable mechanisms of its pathogenesis.
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