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ADAMTS13 gene defects in two brothers with constitutional thrombotic thrombocytopenic purpura and normalization of von Willebrand factor‐cleaving protease activity by recombinant human ADAMTS13
Author(s) -
Antoine Gerhard,
Zimmermann Klaus,
Plaimauer Barbara,
Grillowitzer Monika,
Studt JanDirk,
Lämmle Bernhard,
Scheiflinger Friedrich
Publication year - 2003
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1046/j.1365-2141.2003.04183.x
Subject(s) - adamts13 , thrombotic thrombocytopenic purpura , von willebrand factor , allele , locus (genetics) , recombinant dna , medicine , coagulopathy , immunology , gene , protease , genetics , microbiology and biotechnology , biology , platelet , enzyme , biochemistry
Summary. 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.