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Blood, 1 June 2004, Vol. 103, No. 11, pp. 4195-4197.
Prepublished online as a Blood First Edition Paper on February 24, 2004March 4, 2004; DOI 10.1182/blood-2003-11-3888.

Submitted November 13, 2003
Accepted February 12, 2004
Familial acquired thrombotic thrombocytopenic purpura: ADAMTS-13 inhibitory autoantibodies in identical twins
Jan-Dirk Studt, Johanna A Kremer Hovinga, Radovan Radonic, Vladimir Gasparovic, Dragutin Ivanovic, Marijan Merkler, Urs Wirthmueller, Clemens Dahinden, Miha Furlan, and Bernhard Lammle*
Central Hematology Laboratory, Inselspital, University Hospital, Bern, Switzerland
Department of Internal Medicine, University Hospital, Zagreb, Croatia (Hrvatska)
Institute of Immunology, Inselspital, University Hospital, Bern, Switzerland
* Corresponding author; email: bernhard.laemmle{at}insel.ch.
Thrombotic thrombocytopenic purpura (TTP) occurs either in a congenital form caused by ADAMTS13 gene mutations, or is acquired and most often due to ADAMTS-13 inhibitory autoantibodies. In congenital TTP siblings are often affected while acquired TTP occurs sporadically and familial clustering has not been described so far. We report identical twin sisters suffering from acquired TTP due to IgG autoantibodies inactivating ADAMTS-13, suggesting an important role of hitherto unidentified genetic determinants of ADAMTS-13 inhibitor formation. These cases also demonstrate that familial clustering is not sufficient for unambiguously diagnosing hereditary ADAMTS-13 deficiency and congenital TTP.

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