RESUMO
OBJECTIVES: Genetic polymorphisms may help for individualized drug dosing and improved therapeutics. CYP3A4 is responsible for the metabolism of more than 50% of the commonly used drugs and metabolizes typical antipsychotic medications and antidepressant drugs. The objective of the study was to assess the genotype and allele frequencies of CYP3A4 -392A>G in Turkish patients with major depressive disorder receiving any SSRIs and to compare these results with the frequencies of other ethnic groups. MATERIALS AND METHODS: Genotyping analyses of CYP3A4 -392A>G was conducted on 84 Turkish patients using the PCR-RFLP technique. RESULTS: The allele frequencies were found as 0.982 (A) and 0.018 (G) for CYP3A4 -392A>G. The genotype frequencies were determined as 0.976 (AA), 0.012 (AG), and 0.012 (GG). The genotype frequencies were consistent with the Hardy-Weinberg equilibrium. CONCLUSION: The genotype and allele frequencies of CYP3A4 -392A>G were determined to be low in Turkish patients with major depressive disorder receiving SSRIs. Furthermore, the results of the study were compared with those of other ethnic groups and they displayed pronounced differences among other ethnic groups, especially black subjects.