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A genomic phage library was constructed using lymphocyte DNA from a patient with cross-reacting material-positive, moderately severe hemophilia B. The library was screened by using a full-length factor IX cDNA as a hybridization probe. DNA sequence analysis of the factor IX exons and intron/exon
The potential role of alterations in protein Z (PZ) concentrations in the pathogenesis of coagulation has been investigated in several studies which, however, yielded conflicting results. Protein Z deficiency may induce bleeding as well as prothrombotic tendencies and it might occur as an inherited
Factor IX is a multidomain protein and is the proenzyme of a serine protease, factor IXa, essential for hemostasis. In this report, we describe the molecular basis of hemophilia B (deficiency of factor IX activity) in five patients who have neither deletions nor rearrangements of the factor IX gene.
The haemophilias are a group of inherited haemostatic disorders that require regular clotting factor replacement therapy in the severe and moderately severe subgroups. Prior to the introduction of adequate viral inactivation methods in 1985, haemophilia patients were at exceptionally high risk of
Hemophilia A and B, diseases caused by the lack of factor VIII (FVIII) and factor IX (FIX) respectively, lead to insufficient thrombin production, and therefore to bleeding. New therapeutic strategies for hemophilia treatment that do not rely on clotting factor replacement, but imply the
Protein Z-dependent protease inhibitor (ZPI), is an important anticoagulant protein in plasma that functions in complex with its cofactor, protein Z (PZ) to rapidly inhibit activated factor X (FXa) on a procoagulant membrane surface. Recent studies suggest that the ZPI-PZ anticoagulant Essential to hemostasis is the interaction of factor IXa with factor VIIIa. Recent studies indicate that helix-330 in the protease domain of factor IXa provides a critical binding site for factor VIIIa. Although weaker interactions cannot be ruled out, a primary role of the EGF1 domain of factor IXa
A patient with severe haemophilia B with a glycine-to-valine missense mutation at residue 190 (c25, chymotrypsin numbering) in factor IX (FIX; FIX-G190V or FIX-FuChou) had <1% of normal FIX clotting activity and 36% of normal FIX antigen levels (cross-reacting material- reduced, CRMr). Residue 190
In July 1996 the Food and Drug Administration (FDA) alerted healthcare providers about 15 case reports of spontaneous bleeding episodes in HIV-positive haemophiliacs taking HIV protease inhibitors. In order to characterize the bleeding associated with HIV protease inhibitor therapy, the FDA's
Seventeen HIV-positive patients with congenital haemophilia, one with von Willebrand's disease, and one with acquired haemophilia in remission, were treated with antiretroviral protease inhibitors. Clear increases in the frequency of bleeds or changes in the bleeding pattern were documented in 10
The genetic basis of a mild form of haemophilia Bm has been investigated. The patient under investigation has a mild bleeding disorder and has never experienced spontaneous bleeds. Factor IX coagulant activity (FIX:C) was 0.15 units/ml and factor IX antigen (FIX:Ag) 1.32 units/ml. The prothrombin