Multiple VH genes are used to assemble human antibodies directed toward the A3-Cl domains of factor VIII

A well-known complication of factor VIII replacement therapy in patients with hemophilia A is the development of inhibitory antibodies. Several studies have demonstrated the presence of a binding site for factor VIII inhibitors in the A3 domain. Six different human monoclonal single-chain variable domain antibody fragments (scFv) directed toward the A3-C1 domains of factor VIII have been isolated, using phage display technology. Sequence analysis revealed that the V(H) domains of 2 scFv were encoded by germline gene segments from the V(H)1 gene family and 4 by germline gene segments belonging to the V(H)3 gene family. Epitope mapping of the scFv was performed, using a series of hybrid factor VIII/factor V light chain fragments. This analysis revealed that 5 of 6 scFv were directed against a region encompassing amino acid sequence Q1778-D1840 in the A3 domain, a previously identified binding site for factor VIII inhibitors. Only 2 of 5 scFv directed against amino acid sequence Q1778-D1840 inhibited the procoagulant activity of factor VIII. Our results define the properties of human antibodies directed against region Q1778-D1840 in the A3 domain. Binding of one, noninhibitory scFv was independent of the region Q1778-D1840, suggesting the presence of an additional binding site for anti-factor VIII antibodies in the A3-C1 domains of factor VII

Covid-19 en het Familie- en Jeugdrecht

In dit editorial schetst de redactie van het Tijdschrift voor Familie- en Jeugdrecht kort de zorgen en dilemma's met betrekking tot COVID-19 en het familie- en jeugdrecht, gebaseerd op de situatie begin mei 2020, die naar verwachting ook de komende maanden aandacht (blijven) behoeven.Effective Protection of Fundamental Rights in a pluralist worl

Covid-19 en het Familie- en Jeugdrecht

In dit editorial schetst de redactie van het Tijdschrift voor Familie- en Jeugdrecht kort de zorgen en dilemma's met betrekking tot COVID-19 en het familie- en jeugdrecht, gebaseerd op de situatie begin mei 2020, die naar verwachting ook de komende maanden aandacht (blijven) behoeven.Effective Protection of Fundamental Rights in a pluralist worl