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- W2122027974 abstract "We describe a von Willebrand disease (VWD) variant characterized by low plasma and platelet von Willebrand factor (VWF), impaired ristocetin-induced VWF binding to platelet glycoprotein Ib (GPIb), and abnormal VWF multimer pattern not associated with the absence of large forms. A C-to-T transition at nucleotide 4120 in exon 28 of the VWF gene was found; this mutation introduces a cysteine at the codon for Arg 611 of mature VWF. In addition to the decreased factor VIII (FVIII) and VWF levels, ristocetin-induced platelet aggregation (RIPA) was almost absent, and VWF ristocetin cofactor activity (VWF:RCo) was significantly more decreased than VWF antigen. The patients (mother and son) also showed a defect in VWF collagen-binding activity. Plasma VWF multimers were decreased, with no limit in the size of large forms, and the normal discontinuous multimer organization was replaced by a diffuse smear, especially detectable in the large forms. This picture was emphasized by 1-deamino-8-D -arginine vasopressin (DDAVP) infusion, so that the abnormal VWF multimers appeared to have a molecular weight higher than those present in, or released by, human umbilical vein endothelial cells. DDAVP also increased FVIII and VWF levels but did not normalize the GPIb-dependent VWF functions expressed as RIPA and VWF:RCo. We include this variant in type 2M VWD, focusing on the abnormality in GPIb-dependent VWF function. We advance that this defect depends on the mutation in the GPIb binding domain of VWF rather than the abnormal VWF multimer pattern. (J Lab Clin Med 2001;137:70-6)" @default.
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- W2122027974 date "2001-01-01" @default.
- W2122027974 modified "2023-09-23" @default.
- W2122027974 title "Type 2M von Willebrand disease variant characterized by abnormal von Willebrand factor multimerization" @default.
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- W2122027974 doi "https://doi.org/10.1067/mlc.2001.111252" @default.
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