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Characterization of seven novel mutations causing factor XI deficiency

From The Amalia Biron Research Institute of Thrombosis and Hemostasis, Chaim Sheba Medical Center, Tel-Hashomer and Sackler Faculty of Medicine, Tel Aviv University, Israel (MZ, AZ, OS, GK, US); Department of Biochemistry, George S. Wise Faculty of Life Sciences, Tel-Aviv University, Israel (ML); Department of Clinical Hematology, Centre Hospitalier de la Cote Basque, Bayonne, France (FB); Department of Biological Haematology, Hotel-Dieu Hospital, Paris, France (MS, JC); Department of Biological Haematology, Hopital Beaujon, Clichy, France (MD); Maccabi Health Service, Tel-Aviv, Israel (AH); Laboratoire D’ Hématologie, Centre de Biologie Est, Groupe Hospitalier Est, Lyon, France (MB); Department of Hematology, The Keck School of Medicine, University of Southern California, Los Angeles, USA (DF)

Correspondence: Uri Seligsohn, Amalia Biron Research Institute of Thrombosis and Hemostasis, Chaim Sheba Medical Center, Tel-Hashomer, Israel 52621 E-mail: seligson{at}sheba.health.gov.il

Background and Objectives: Factor XI (FXI) deficiency is a rare autosomal recessive disorder, the main manifestation of which is injury-related bleeding. The disorder is rare in most populations, but common among Jews in whom two mutations, E117X and F283L, account for 98% of cases. Other mutations, C38R and C128X, are prevalent in French Basques and Britons, respectively. Additional sporadic mutations have been described in most parts of the world. The objective of this study was to identify the mutations in 15 unrelated FXI-deficient patients and characterize missense mutations by expression in baby hamster kidney (BHK) cells.

Design and Methods: Clinical and laboratory information and DNA samples were obtained from the patients and mutations were identified by sequencing. Missense mutations were expressed in BHK cells and their effect on FXI secretion and dimerization was assessed using enzyme-linked immunosorbent assay and immunoblotting.

Results: Of 16 mutations detected, seven are novel including two deletions, one splice site and four missense mutations. Expression of the four novel missense mutations (C58Y, Y427C, C527Y and V20A) in cells revealed no secretion of FXI-C58Y, Y427C and C527Y and secretion of only 22% of normal in the medium for FXI-V20A. Secretion of FXI from BHK cells harboring a previously reported E297K substitution cells was also impaired (4.5% of wild-type). Homodimerization was normal for all five mutants.

Interpretation and Conclusions: Defective homodimerization of FXI was previously recognized as a major mechanism for defective secretion of FXI from producing cells. In this study, five FXI missense mutations (four novel) were associated with impaired secretion albeit normal dimerization, underscoring the existence of other mechanisms for defective secretion.

Key words: factor XI, factor XI deficiency, factor 11 gene.

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