Genomics of schizophrenia and pharmacogenomics of antipsychotic drugs


Antipsychotic drugs are the neuroleptics currently used in the treatment of schizophrenia (SCZ) and psychotic disorders. SCZ has a heritability estimated at 70% - 90%; and pharmacogenomics accounts for 60% - 90% variability in the pharmacokinetics and pharmacodynamics of psychotropic drugs. Personalized therapeutics based on individual genomic profiles in SCZ entails the characterization of 5 types of gene clusters and their related metabolomic profiles: 1) genes associated with disease pathogenesis; 2) genes associated with the mechanism of action of drugs; 3) genes associated with drug metabolism (phase I and II reactions); 4) genes associated with drug transporters; and 5) pleiotropic genes involved in multifaceted cascades and metabolic reactions. Genetic studies in SCZ have revealed the presence of chromosome anomalies, copy number variants, multiple single-nucleotide polymorphisms of susceptibility distributed across the human genome, aberrant single-nucleotide polymorphisms in microRNA genes, mitochondrial DNA mutations, and epigenetic phenomena. Pharmacogenetic studies of psychotropic drug response have focused on determining the relationship between variation in specific candidate genes and the positive and adverse effects of drug treatment. Approximately 18% of neuroleptics are major substrates of CYP1A2 enzymes, 40% of CYP2D6, and 23% of CYP3A4. About 10% - 20% of Western populations are defective in genes of the CYP superfamily. Only 26% of Southern Europeans are pure extensive metabolizers for the trigenic cluster integrated by the CYP2D6 + CYP2C19 + CYP2C9 genes. Efficacy and safety issues in the pharmacological treatment of SCZ are directly linked to genetic clusters involved in the pharmacogenomics of antipsychotic drugs and also to environmental factors. Consequently, the incorporation of pharmacogenomic procedures both to drugs under development and drugs on the market would help to optimize therapeutics in SCZ and other central nervous system disorders.

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Cacabelos, R. , Cacabelos, P. and Aliev, G. (2013) Genomics of schizophrenia and pharmacogenomics of antipsychotic drugs. Open Journal of Psychiatry, 3, 46-139. doi: 10.4236/ojpsych.2013.31008.

Conflicts of Interest

The authors declare no conflicts of interest.


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