title: ADAMTS13 gene defects in two brothers with constitutional thrombotic thrombocytopenic purpura and normalization of von Willebrand factor-cleaving protease activity by recombinant human ADAMTS13.
abstract: Genetic analysis of the ADAMTS13 locus identified six mutations in the ADAMTS13 genes of two brothers suffering from constitutional thrombotic thrombocytopenic purpura (TTP): a stop codon leading to a truncated protein on the paternal ADAMTS13 allele and five amino acid exchanges on the maternal allele, three of which were single nucleotide polymorphisms. The other two mutations, not detected in 230 sequenced alleles of healthy control subjects, are, therefore, probably responsible, alone or as part of a combination, for the severe ADAMTS13 deficiency. We also investigated the feasibility of using recombinant ADAMTS13 (rADAMTS13) for normalization of von Willebrand factor-cleaving protease (VWF-cp) activity in plasma of the two congenitally deficient patients. Addition of rADAMTS13 to their plasma restored the VWF-processing pattern to normal, suggesting the potential usefulness of rADAMTS13 for therapy and prophylaxis of familial TTP.
authors.affiliation: Baxter BioScience, Biomedical Research Centre, Austria.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Antoine
authors.forename: Klaus
authors.initials: K
authors.lastname: Zimmermann
authors.forename: Barbara
authors.initials: B
authors.lastname: Plaimauer
authors.forename: Monika
authors.initials: M
authors.lastname: Grillowitzer
authors.forename: Jan-Dirk
authors.initials: JD
authors.lastname: Studt
authors.forename: Bernhard
authors.initials: B
authors.lastname: Lämmle
authors.forename: Friedrich
authors.initials: F
authors.lastname: Scheiflinger
mesh_terms: D051722:ADAM Proteins; D000071120:ADAMTS13 Protein; D019943:Amino Acid Substitution / Q000235:genetics; D018388:Codon, Terminator; D006801:Humans; D008297:Male; D008666:Metalloendopeptidases / Q000235:genetics*; D009154:Mutation / Q000235:genetics; D010375:Pedigree; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics; D011697:Purpura, Thrombotic Thrombocytopenic / Q000235:genetics*; D035781:Siblings; D014841:von Willebrand Factor / Q000235:genetics*
chemical_list: D018388:Codon, Terminator; D014841:von Willebrand Factor; D051722:ADAM Proteins; D008666:Metalloendopeptidases; D000071120:ADAMTS13 Protein; C099604:ADAMTS13 protein, human