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A family with hereditary factor X deficiency with a point mutation Gla32 to Gln in the Gla domain (factor X Tokyo)

T Zama1, M Murata, R Watanabe

  • 1Department of Medicine, School of Medicine, Keio University, Shinjuku-ku, Tokyo.

British Journal of Haematology
|September 1, 1999
PubMed

We report a new family with hereditary factor X deficiency. The propositus had a markedly prolonged prothrombin time, a mild prolongation of activated partial thromboplastin time and a clotting time activated by Russell's viper venom. Factor X activity in plasma was 3 u/dl (normal range 56-138 u/dl). Factor X antigen level was 61 u/dl. Molecular analysis revealed a homozygous mutation, Glu (GAG) to Gln (CAG) at residue 32 which normally undergoes gamma-carboxylation within the gamma-carboxyglutamic acid rich domain. The genotypes of family members completely correlated with their factor X activities. It is suggested that the Glu32 to Gln mutation is the molecular basis for the abnormal factor X in this family.

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