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- W1757083470 abstract "Summary. The genetic diagnosis of a single family with combined vitamin K-dependent clotting factor deficiency (VKCFD2, OMIM #607473) finally led to the identification and molecular characterization of vitamin K epoxide reductase (VKORC1). VKORC1 is the key enzyme of the vitamin K cycle and the molecular target of coumarins, which represent the most commonly prescribed drugs for therapy and prevention of thromboembolic conditions. However, coumarins are known to have a narrow therapeutic window and a considerable risk of bleeding complications caused by a broad variation of intra- and inter-individual drug requirement. Now, 3 years after its identification, VKORC1 has greatly improved our understanding of the vitamin K cycle and has led to the translation of basic research into clinical practise in at least three directions: (i) Mutations within VKORC1 have been shown to cause a coumarin-resistant phenotype and a single SNP (rs9923231) within the VKORC1 promoter region has been identified as the major pharmacodynamic determinant of coumarin dose. Together with the previously described CYP2C9 variants and other dose-influencing factors, such as age, gender and weight, individualized dosing algorithms have become available. (ii) Preliminary studies indicate that concomitant application of low-dose vitamin K (80–100 μg day−1) and warfarin significantly improves INR stability and time of INR within the therapeutic range. (iii) Co-expression studies of FIX and FX with VKORC1 have shown that VKOR activity is the rate-limiting step in the synthesis of biologically active vitamin K-dependent factors. Thus, co-expression of VKORC1 leads to a more efficient production of recombinant vitamin K-dependent coagulation factors such as FIX and FVII. This could improve production of recombinant factor concentrates in the future." @default.
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- W1757083470 date "2007-07-01" @default.
- W1757083470 modified "2023-10-03" @default.
- W1757083470 title "VKORC1: molecular target of coumarins" @default.
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- W1757083470 doi "https://doi.org/10.1111/j.1538-7836.2007.02549.x" @default.
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