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Prepublished online as a Blood First Edition Paper on March 20, 2003; DOI 10.1182/blood-2002-11-3599.

Submitted December 2, 2002
Accepted March 11, 2003
Mutations in exon 2 of GATA1 are early events in megakaryocytic malignancies associated with trisomy 21
Liat Rainis, Dan Bercovich, Sabine Strehl, Andrea Teigler-Schlegel, Batia Stark, Jan Trka, Ninette Amariglio, Andrea Biondi, Inna Muler, Gideon Rechavi, Helena Kempski, Oskar A Haas, and Shai Izraeli*
Department of Pediatric Hemato-Oncology, Safra Childrens Hospital, Sheba Medical Center, Affiliated to Tel-Aviv University, Tel-Hashomer, Israel
Genetic Institute, Tel-Aviv Souraski Medical Center, Affiliated toTel-Aviv University, Tel-Aviv, Israel
Department of Human Molecular Genetics, Migal - Glailee Technological Center, Kyriat Shemona, Israel
Department of Molecular and Cytogenetics, Children's Cancer Research Institute, St Anna Children's Hospital, Vienna, Austria
Oncogenetic Laboratory, Children's University Hospital, Giessen, Germany
Department of Pediatric Hemato-Oncology, Schneider's Childrens' Medical Center, Petach-Tiqva, Israel
Laboratory of Molecular Genetics, CLIP, 2nd Department of Pediatrics, 2nd Medical School, Charles University, Prague, Czech Republic
Centro M Tettamanti, Clinica Pediatrica, Universita Milano-Bicocca, Monza, Italy
Institute of Child Health, Great Ormond Street Hospital, London, United Kingdom
* Corresponding author; email: sizraeli{at}post.tau.ac.il.
Patients with Down syndrome (DS) frequently develop two kinds of clonal megakaryocytosis: a common, congenital, spontaneously resolving, transient myeloproliferative disorder (TMD) and less common childhood acute megakaryoblastic leukemia (AMKL). Recently, acquired mutations in exon 2 of GATA1, an X-linked gene encoding a transcription factor that promotes megakaryocytic differentiation, were described in six DS patients with AMKL. The mutations prevent the synthesis of the full length GATA1 but allow the synthesis of a shorter GATA1 protein (GATA1s) that lacks the transactivation domain. To test if mutated GATA1 is involved in the initiation of clonal megakaryoblastic proliferation or in the progression to AMKL, we screened 35 DS patients with either AMKL or TMD and 7 non-DS children with AMKL for mutations in exon 2 of GATA1. Mutations were identified in 16/18 DS patients with AMKL, in 16/17 DS patients with TMD and in two identical twins with AMKL and acquired trisomy 21. Analysis revealed various types of mutations in GATA1 including deletion/insertions, splice mutations, nonsense and missense point mutations - all of which prevent the generation of full length GATA1, but preserve the translation of GATA1s. We also show that the likely mechanism of generation of GATA1 isoforms is alternative splicing of exon 2 rather than, or in addition to, alternative translation initiation as was proposed before. These findings suggest that acquired intrauterine inactivating mutations in GATA1 and generation of GATA1s cooperate frequently with trisomy 21 in initiating megakaryoblastic proliferation but are insufficient for progression to AMKL.

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