The first deletion mutation in the TSP1-6 repeat domain of ADAMTS13 in a family with inherited thrombotic thrombocytopenic purpura

Roberta Palla, Silvia Lavoretano, Rossana Lombardi, Isabella Garagiola, Mehran Karimi, Abdolreza Afrasiabi, Mani Ramzi, Raimondo De Cristofaro, Flora Peyvandi

Research output: Contribution to journalArticlepeer-review

Abstract

The inherited deficiency of ADAMTS13 is usually associated with severe forms of thrombotic thrombocytopenic purpura. Among the mutations identified in the ADAMTS13 gene, none have been described on the TSP1-6 repeat domain. We investigated an Iranian family with a history of chronic recurrent thrombotic thrombocytopenic purpura, severe ADAMTS13 deficiency and a heterogeneous pattern of clinical symptoms among affected members. Genetic analysis revealed a homozygous deletion of nucleotides 2930-2935 (GTGCCC) in exon 23 of ADAMTS13, leading to the replacement of Cys977 by a Trp and the deletion of Ala978 and Arg979 in the TSP1-6 repeat domain. To explore the mechanism of ADAMTS13 deficiency, in vitro expression studies were performed. Western blotting, pulse-chase labeling and immunofluorescence studies demonstrated a secretion pathway defect of the mutant protein, with no intracellular accumulation. This finding is consistent with the severe ADAMTS13 deficiency but does not explain the heterogeneous clinical picture of the 3 siblings carrying the same mutation.

Original languageEnglish
Pages (from-to)289-293
Number of pages5
JournalHaematologica
Volume94
Issue number2
DOIs
Publication statusPublished - Feb 2009

Keywords

  • ADAMTS13
  • Deletion
  • Mutation
  • Thrombotic thrombocytopenic purpura
  • TSP-1 repeat

ASJC Scopus subject areas

  • Hematology

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