conclusions simpleprobe® real-time pcr is a fast and accurate technique qualified to detect vkorc1 and cyp2c9 snps. these results encourage taking further steps towards using vkorc1 and cyp2c9 allelic screening to prevent clinical complications due to resistance or sensitivity to warfarin as well as anti-coagulant dose adjustment. results the allelic frequencies for vkorc1 c1173t (cc, ct, tt) w...

Vitamin K acts as a cofactor during the gamma-carboxylation of vitamin K-dependent proteins. Undercarboxylated osteocalcin (ucOC) is a suggested biomarker of vitamin K status. The +2255 polymorphism of the vitamin K epoxide reductase gene (VKORC1) was shown to be associated with the recycling rate of the active form of vitamin K. We investigated the association between dietary vitamin K intake ...

BACKGROUND Genetic variants of the enzyme that metabolizes warfarin, cytochrome P-450 2C9 (CYP2C9), and of a key pharmacologic target of warfarin, vitamin K epoxide reductase (VKORC1), contribute to differences in patients' responses to various warfarin doses, but the role of these variants during initial anticoagulation is not clear. METHODS In 297 patients starting warfarin therapy, we asse...

Objective—Besides effects on hemostasis, vitamin K-dependent proteins play a role in bone mineralization and arterial calcification. We investigated the association between the VKORC1 1173C T polymorphism and calcification of the aortic far wall in a large population-based cohort. Methods and Results—Aortic calcification was diagnosed by radiographic detection of calcified deposits in the abdom...

Vitamin K antagonists (VKAs) are highly effective but have a narrow therapeutic index and require routine monitoring of the INR. The primary aim of pharmacogenetics (PGx) is to optimize patient care, achieving drug treatments that are personalized according to the genetic profile of each patient. The best-characterized genes involved in VKA PGx involve pharmacokinetics (VKORC1) and pharmacodyna...

Zusammenfassung Die Identifizierung der Vitamin-K-Epoxid-Reduktase (VKORC1) hat maßgeblich zu einem besseren Verständnis des Vitamin-K-Zyklus beigetragen. Das VKORC1-Protein konnte als das molekulare Target der Cumarine charakterisiert werden und stellt das geschwindigkeitsbestimmende Enzym des Vitamin-K-Zyklus und möglicherweise die alleinige Komponente der VKOR-Aktivität dar. Mutationen und P...

This document is an update to the 2011 Clinical Pharmacogenetics Implementation Consortium (CPIC) guideline for CYP2C9 and VKORC1 genotypes and warfarin dosing. Evidence from the published literature is presented for CYP2C9, VKORC1, CYP4F2, and rs12777823 genotype-guided warfarin dosing to achieve a target international normalized ratio of 2-3 when clinical genotype results are available. In ad...

Warfarin is a vitamin K antagonist that genetic and non-genetic factors affected on its doserequirement in the patients with cardio vascular disease. The aim of this study was whetherthe APOE and VKORC1 polymorphisms influence on warfarin dose requirements in the partof Iranian patients. Blood samples were collected from 86 warfarin-treated patients. Afterextraction of genomic DNA, the VKORC1 (...

Osteocalcin (OCN) is an osteoblast-derived hormone favoring glucose homeostasis, energy expenditure, male fertility, brain development, and cognition. Before being secreted by osteoblasts in the bone extracellular matrix, OCN is γ-carboxylated by the γ-carboxylase (GGCX) on three glutamic acid residues, a cellular process requiring reduction of vitamin K (VK) by a second enzyme, a reductase cal...