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Blood, 15 March 2002, Vol. 99, No. 6, pp. 2268-2269

BRIEF REPORT

Missense mutations of the WASP gene cause intermittent X-linked thrombocytopenia

Lucia D. Notarangelo, Cinzia Mazza, Silvia Giliani, Chiara D'Aria, Francesca Gandellini, Chiara Ravelli, Maria Grazia Locatelli, David L. Nelson, Hans D. Ochs, and Luigi D. Notarangelo

From the Department of Pediatrics, Istituto di Medicina Molecolare Angelo Nocivelli, University of Brescia; the Metabolism Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD; and the Department of Pediatrics, University of Washington, Seattle.

Mutations of the WASP gene have been previously shown to be responsible for classical Wiskott-Aldrich syndrome, isolated X-linked thrombocytopenia, and severe, congenital X-linked neutropenia. We report herewith 2 families in which affected males had a history of intermittent thrombocytopenia with consistently reduced platelet volume, in the absence of other major clinical features, and carried missense mutations of the WASP gene that allowed substantial protein expression. This observation broadens the spectrum of clinical phenotypes associated with WASP gene defects, and it indicates the need for molecular analysis in males with reduced platelet volume, regardless of the platelet number.

© 2002 by The American Society of Hematology.
 

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