1173C>T polymorphism in VKORC1 modulates the required warfarin dose

K. Kosaki, C. Yamaghishi, R. Sato, H. Semejima, H. Fuijita, K. Tamura, K. Maeyama, H. Yamagishi, A. Sugaya, H. Dodo, Y. Tanigawara, T. Takahashi

研究成果: Article査読

29 被引用数 (Scopus)


The response to warfarin is highly variable among individuals and such variability is likely to have some genetic basis. We evaluted the effect of VKORC1 polymorphisms on warfarin response among Japanese, taking advantage of its unique population structure in which CYP2C9*2 and*3 alleles are relatively rare. Thirty-one patients (12-34 years old; median, 22) on warfarin were recruited from a pediatric cardiology clinic. Genotyping of the C>T polymorphism at position 1173 in intron 1 of VKORC1 revealed that 26 patients (84%) were T/T homozygotes at nucleotide 1173, whereas 5 (16%) were C/T heterozygotes. Complete linkage disequilibrium was observed between the 1173C > T polymorphism and another polymorphism, the 3730G > A, in the 3′ untranslated region. The C/T heterozyogtes at the 1173C > T polymorphism tended to require more warfarin than the T/T homozygotes, when adjusted for international normalized ratio (p = 0.003). Both the 1173C > T polymorphism and the 3730G > A polymorphism are likely to be inert from a functional standpoint. Rather, based on the complete linkage disequilibrium between 1173C > T and 3730G > A polymorphisms, we suspect that the actual change that defines the relative resistance to warfarin may be present in the proximity of these two polymorphisms.

ジャーナルPediatric Cardiology
出版ステータスPublished - 2006 12月

ASJC Scopus subject areas

  • 小児科学、周産期医学および子どもの健康
  • 循環器および心血管医学


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