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A rare inherited coagulation disorder: Combined homozygous factor VII and factor X deficiency
Author(s) -
Menegatti Marzia,
Karimi Mehran,
Garagiola Isabella,
Mannucci PierMannuccio,
Peyvandi Flora
Publication year - 2004
Publication title -
american journal of hematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.456
H-Index - 105
eISSN - 1096-8652
pISSN - 0361-8609
DOI - 10.1002/ajh.20132
Subject(s) - missense mutation , consanguinity , genotyping , coagulation disorder , phenotype , medicine , coagulation , mutation , coagulopathy , factor x , genetics , nonsense mutation , gene , biology , genotype , pediatrics , platelet , thrombin
The combined presence in the homozygous state of more than one recessively transmitted coagulation defect may rarely occur in countries with a high rate of consanguinity. In an Iranian family consisting of two parents (second cousins) and two affected siblings, initial phenotypic analysis led to a diagnosis of mild FX deficiency (10–19% FX activity, 42–54% FX:Ag), and genotyping revealed a new homozygous missense mutation in the corresponding gene (Ser3Cys). As both of the sibs had a severe bleeding history that was not compatible with mild deficiency of FX, further phenotypic analysis revealed the additional presence of severe FVII deficiency (<1% FVII activity; 63–111% FVII:Ag) associated with the homozygous missense gene mutation Cys310Phe. In this kindred, lack of identification of the double coagulation defect might have led not only to incomplete understanding of the clinical phenotype but also to an incorrect prenatal diagnosis. Am. J. Hematol. 77:90–91, 2004. © 2004 Wiley‐Liss, Inc.