CYP2C9*2 and CYP2C9*3 allele variants of CYP2C9 cytochrome gene in St. Petersburg population, and their clinical role in warfarin anticoagulant therapy

Abstract

One of the leading anticoagulants in Russia is warfarin. Its pharmacokinetics is determined by structural polymorphisms of CYP2C9 cytochrome gene, metabolizing warfarin. In the present study, the authors analyzed: 1) prevalence of two allele variants of this gene; 2) patients' individual reaction to warfarin, according to their CYP2C9 genotype. It was demonstrated that: 1) prevalence of CYP2C9 gene allele variants in St. Petersburg population was 82,66% (CYP2C9*1), 11,11% (CYP2C9*2), and 6,32% (CYP2C9*3); 2) individuals with CYP2C9*2 and CYP2C9*3 alleles reached therapeutic hypocoagulation faster, and required significantly lower weekly doses of the medication. Routine identification of CYP2C9*2 and CYP2C9*3 alleles is recommended to all patients administered warfarin.

Keywords

• anticoagulant therapy
• warfarin
• genetic aspects