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Thromb Haemost 2003; 89(02): 243-248
DOI: 10.1055/s-0037-1613438
Blood Coagulation, Fibrinolysis and Cellular Haemostasis
Schattauer GmbH

Impaired prothrombinase activity of factor X Gly381Asp results in severe familial CRM+ FX deficiency

Mirko Pinotti
1   Department of Biochemistry and Molecular Biology, University of Ferrara, Ferrara, Italy
,
Rodney M. Camire
2   Department of Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, USA
,
Marcello Baroni
1   Department of Biochemistry and Molecular Biology, University of Ferrara, Ferrara, Italy
,
Anna Rajab
3   The Royal Hospital, Sultanate of Oman
,
Giovanna Marchetti
1   Department of Biochemistry and Molecular Biology, University of Ferrara, Ferrara, Italy
,
Francesco Bernardi
1   Department of Biochemistry and Molecular Biology, University of Ferrara, Ferrara, Italy
› Author Affiliations
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Publication History

Received 02 July 2002

Accepted after revision 30 November 2002

Publication Date:
07 December 2017 (online)

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Summary

We investigated three members of a large Omani family affected by severe factor X (FX) deficiency (coagulant activity <1%) and showing marked differences in the onset of severe hemorrhagic symptoms. All patients were homozygous for a novel FX mutation (Gly381Asp) in the structurally conserved region of the serine protease active site. Expression levels of recombinant 381D-FX were similar to those of wt-FX, indicating the presence of a severe CRM+ FX deficiency, a poorly investigated condition. The 381D-FX was normally activated and did not show a detectable amidolytic activity. Instead, we observed a residual activity in a prothrombin-time based assay (1%) and in prothrombinase assays both in plasma (1%) and in purified systems (3%). Comparison with FX variants characterized by reduced activation suggests that mutations affecting FX activity might result in a more pronounced impairment of coagulation and thus in severe hemorrhagic phenotype. In addition, this study indicates that the hemorrhagic heterogeneity observed in FX deficiencies is only partially explained by molecular analysis of FX gene.

Keywords

CRM+ FX deficiency - hemorrhagic phenotype - recombinant FX - FX activity
 

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