X-Linked Thrombophilia with a Mutant Factor IX (Factor IX Padua)
Copyright policy )X-Linked Thrombophilia with a Mutant Factor IX (Factor IX Padua)
We report a case of juvenile thrombophilia associated with a substitution of leucine for arginine at position 338 (R338L) in the factor IX gene (factor IX-R338L). The level of the mutant factor IX protein in plasma was normal, but the clotting activity of factor IX from the proband was approximately eight times the normal level. In vitro, recombinant factor IX-R338L had a specific activity that was 5 to 10 times as high as that in the recombinant wild-type factor IX. The R338 substitution causes a gain-of-function mutation, resulting in factor IX that is hyperfunctional.
- Children's Hospital of Philadelphia United States
- University of Pennsylvania United States
- University of Padua Italy
Factor IX, Male, Young Adult, Genotype, DNA Mutational Analysis, Mutation, Missense, Humans, Point Mutation, Thrombophilia, Female, Genetic Diseases, X-Linked, Pedigree
Factor IX, Male, Young Adult, Genotype, DNA Mutational Analysis, Mutation, Missense, Humans, Point Mutation, Thrombophilia, Female, Genetic Diseases, X-Linked, Pedigree
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