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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.

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