Although the presence of a VWF mutation significantly exacerbates the haemorrhagic complications in patients with mild haemophilia A, it has only mild effects on haemophilia A carriers.
Von Willebrand disease (VWD) type 2N is characterized by a defective binding of factor VIII (FVIII) to von Willebrand factor (VWF) resulting in diminished plasma FVIII levels and a clinical phenotype mimicking mild haemophilia A.
Factor VIII-von Willebrand factor binding defects in autosomal recessive von Willebrand disease type Normandy and in mild hemophilia A. New insights into factor VIII-von Willebrand factor interactions.
Deletion of alanine 2201 in the FVIII C2 domain results in mild hemophilia A by impairing FVIII binding to VWF and phospholipids and destroys a major FVIII antigenic determinant involved in inhibitor development.
We previously characterized a functional defect of vWf, limited to its ability to bind FVIII, in two families whose affected members have the same phenotype that mimics mild haemophilia A and was tentatively named von Willebrand's disease (vWD) 'Normandy'.