The cytochrome P450 1A2 (CYP1A2) gene encodes one of the most important enzymes of the Phase I drug metabolism, which is involved in the metabolism of many lipophilic xenobiotics, such as haloperidol, theophylline, phenacetine, and others. The recently discovered single nucleotide polymorphisms CYP1A2*1C (-3860G-->A) in the 5' flanking region of the gene and CYP1A2*1F (-163C-->A) in intron 1 seem to interfere with the expression rate or catalytic function of the enzyme. Polymorphism carriers may either have a risk of reduced drug degradation and side effects, or may present with an increased induction of enzymatic activity resulting in clinical non-response to the prescribed therapy. We investigated two populations, a mental disease group and a healthy control group, to identify whether these two genetic variants are correlated with the general development of a mental disorder and if they could potentially be used as predictive markers for manifestation of the same.

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