PMID: 19925388Nov 21, 2009Paper

Genetic polymorphism of the human cytochrome P450 2C9 gene and its clinical significance

Current Drug Metabolism
B WangS-F Zhou

Abstract

Human cytochrome P450 2C9 (CYP2C9) accounts for approximately 20% of total hepatic CYP content and metabolizes approximately 15% clinically used drugs including S-warfarin, tolbutamide, phenytoin, losartan, diclofenac, and celecoxib. To date, there are at least 33 variants of CYP2C9 (*1B through to *34) being identified. CYP2C9*2 and CYP2C9*3 differ from the wild-type CYP2C9*1 by a single point mutation: CYP2C9*2 is characterised by a 430C>T exchange in exon 3 resulting in an Arg144Cys amino acid substitution, whereas CYP2C9*3 shows an exchange of 1075A>C in exon 7 causing an Ile359Leu substitution in the catalytic site of the enzyme. CYP2C9*2 is frequent among Caucasians with approximately 1% of the population being homozygous carriers and 22% heterozygous. The corresponding figures for the CYP2C9*3 allele are 0.4% and 15%, respectively. Worldwide, a number of other variants have also to be considered. The CYP2C9 polymorphisms are relevant for the efficacy and adverse effects of numerous nonsteroidal anti-inflammatory agents, sulfonylurea antidiabetic drugs and, most critically, oral anticoagulants belonging to the class of vitamin K epoxide reductase inhibitors. Numerous clinical studies have shown that the CYP2C9 polymorphis...Continue Reading

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