The Journal of Experimental Medicine
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Published 3 February 2003. doi:10.1084/jem.20021149
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© Rockefeller University Press, 0022-1007/2003/2/281 $5.00
The Journal of Experimental Medicine, Volume 197, Number 3, 281-296

GATA-1 as a Regulator of Mast Cell Differentiation Revealed by the Phenotype of the GATA-1low Mouse Mutant

Anna Rita Migliaccio1,2, Rosa Alba Rana1, Massimo Sanchez3, Rodolfo Lorenzini4, Lucia Centurione1, Lucia Bianchi5, Alessandro Maria Vannucchi5, Giovanni Migliaccio1,3 and Stuart H. Orkin6

1 Department of Biomorphology, University G. D'Annunzio, 66100 Chieti, Italy
2 Laboratory of Clinical Biochemistry, Istituto Superiore di Sanità, 00161 Rome, Italy
3 Laboratory of Cell Biology, Istituto Superiore di Sanità, 00161 Rome, Italy
4 Laboratory of Servizio Qualità Sicurezza Animale, Istituto Superiore di Sanità, 00161 Rome, Italy
5 Department of Hematology, University of Florence, 50139 Florence, Italy
6 Department of Pediatric Oncology, Children's Hospital, Dana Farber Cancer Institute, Harvard Medical School and Howard Hughes Medical Institute, Boston, MA 02115

Address correspondence to Anna Rita Migliaccio, Clinical Biochemistry, Istituto Superiore Sanità, Viale Regina Elena 299, 00161 Rome, Italy. Phone: 39-06-4990-2690; Fax: 39-06-4938-7143; E-mail: migliar{at}iss.it

Here it is shown that the phenotype of adult mice lacking the first enhancer (DNA hypersensitive site I) and the distal promoter of the GATA-1 gene (neo{Delta}HS or GATA-1low mutants) reveals defects in mast cell development. These include the presence of morphologically abnormal alcian blue+ mast cells and apoptotic metachromatic- mast cell precursors in connective tissues and peritoneal lavage and numerous (60–70% of all the progenitors) "unique" trilineage cells committed to erythroid, megakaryocytic, and mast pathways in the bone marrow and spleen. These abnormalities, which were mirrored by impaired mast differentiation in vitro, were reversed by retroviral-mediated expression of GATA-1 cDNA. These data indicate an essential role for GATA-1 in mast cell differentiation.

Key Words: mast cells • GATA-1 • differentiation • commitment • progenitor cells


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