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Hemophilic factor VIII C1- and C2-domain missense mutations and their modeling to the 1.5-angstrom human C2-domain

M L Liu1, B W Shen, S Nakaya

  • 1Department of Medicine, University of Washington, Puget Sound Blood Center, Seattle 98104-1256, USA.

Blood
|July 27, 2000
PubMed

Insights

Mutations in factor VIII C domains affect binding to von Willebrand factor (vWF), potentially causing hemophilia by reducing factor VIII stability. Some mutations also correlate with inhibitor development in hemophilia A patients.

Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • Factor VIII C domains are crucial for binding von Willebrand factor (vWF) and phospholipid membranes.
  • Hemophilia A is a bleeding disorder often caused by mutations in the Factor VIII gene.

Purpose of the Study:

  • To identify and characterize mutations within the Factor VIII C domains.
  • To investigate the impact of these mutations on vWF binding and their association with hemophilia A and inhibitor development.

Main Methods:

  • Screening of hemophilic patients for Factor VIII C-domain mutations.
  • Localization of mutated residues to high-resolution C2 structure and homology models of C1.
  • Analysis of mutation effects on vWF binding, Factor VIII clotting activity, and antigen levels.
  • Combination of new data with an international mutation database.

Main Results:

  • 14 missense mutations were identified in 30 families, with 9 being novel.
  • 10 missense mutations showed reduced vWF binding, with 8 at surface-exposed residues.
  • Six of these mutants had near-normal Factor VIII clotting activity and antigen levels, suggesting reduced vWF binding impacts stability.
  • 11 C1 and C2 mutations were associated with antibody-inhibitor development in hemophilia A patients, with 6 at surface-exposed residues.

Conclusions:

  • Reduced vWF binding due to C-domain mutations may cause hemophilia by decreasing Factor VIII stability.
  • Specific Factor VIII C-domain mutations are linked to antibody-inhibitor development in hemophilia A.
  • Further structural and binding studies will improve prediction of surface binding sites and their clinical relevance.

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