alexa CYP4F2 genetic variant (rs2108622) significantly contributes to warfarin dosing variability in the Italian population.


Molecular Biology: Open Access

Author(s): Borgiani P, Ciccacci C, Forte V, Sirianni E, Novelli L,

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Abstract INTRODUCTION: It is known that warfarin treatment is problematic, due to its narrow therapeutic range and to the great interindividual variability. Numerous papers have shown the important contribution of CYP2C9 and VKORC1 genetic variants to this variability. Recently, a new SNP within the CYP4F2 gene was found associated with warfarin dose in the USA. AIMS: The aim of our work was to replicate this study in the Italian population and to assess the new CYP4F2 variant relative contribution in explaining warfarin dose variability with respect to CYP2C9 and VKORC1 genetic variants together with age and weight. MATERIALS & METHODS: CYP4F2 rs2108622 genotyping was performed by allelic discrimination assay by TaqMan technology. Analysis of variance and multiple linear regression analyses were carried out to examine the contribution of genetic and nongenetic factors. RESULTS: Our TT patients require 5.49 mg/day versus 2.93 mg/day of our CC patients. Analysis of variance indicates that about 7\% of mean weekly warfarin dose variance is explained by CYP4F2 genotype. Our linear regression model including CYP4F2, CYP2C9 and VKORC1 genetic variants, age and weight, explains 60.5\% of the interindividual variability. CONCLUSION: Our data confirm and strengthen the role of this variant. This article was published in Pharmacogenomics and referenced in Molecular Biology: Open Access

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