Association of pharmacokinetic (CYP2C9) and pharmacodynamic (factors II, VII, IX, and X; proteins S and C; and gamma-glutamyl carboxylase) gene variants with warfarin sensitivity.

Abstract:

:We analyzed mutations of 7 vitamin K-dependent protein and cytochrome P450 2C9 genes in 45 patients and investigated whether any contribute to the large interpatient variability in the warfarin dose-effect relationship. Total clearance and daily dose, INR and INR/Cp, were used as pharmacokinetic and pharmacodynamic indexes, respectively. Patients were grouped by genotype based on a single polymorphism and combinations of polymorphisms. Among the 30 sequence variants identified, CYP2C9*3, 165Thr-->Met of the factor II gene, -402G-->A, (37-bp repeat)n, and -746T-->C of the factor VII gene, and (CAA repeat)n of the gamma-glutamyl carboxylase gene were selected as candidate polymorphisms. As the analysis of single polymorphisms implied, the highest INR/Cp mean values and the lowest warfarin maintenance doses were observed in patients homozygous for the 165Met, -402G, (37-bp repeat)6 and -746T alleles. Multiple regression analysis revealed that warfarin sensitivity was independently associated with -402G-->A, (CAA repeat)n, CYP2C9*3, and 165Thr-->Met, which accounted for 50% of variance. These results suggest that part of the considerable interpatient variation is attributable to genetic variation, and the combined genotyping of CYP2C9 and certain vitamin K-dependent protein genes is useful for predicting anticoagulant responses.

journal_name

Blood

journal_title

Blood

authors

Shikata E,Ieiri I,Ishiguro S,Aono H,Inoue K,Koide T,Ohgi S,Otsubo K

doi

10.1182/blood-2003-09-3043

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

2630-5

issue

7

eissn

0006-4971

issn

1528-0020

pii

2003-09-3043

journal_volume

103

pub_type

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