Published online before print June 16, 2003
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* Molecular Biology Laboratory, Istituto Nazionale per la Ricerca sul Cancro IST, Genova, Italy;
Department of Pediatrics, University of Padova, Italy;
CBA, Genova, Italy;
Department of Microbiology and Immunology, Kimmel Cancer Center, Philadelphia, Pennsylvania; and
¶ Evolution des Regulations Endocriennes, Paris, France
Correspondence: Claudio Brigati, Istituto Nazionale per la Ricerca sul Cancro IST, Largo Rosanna Benzi, 10, 16132, Genova, Italy. E-mail: claudio.brigati{at}istge.it
Dlx genes constitute a gene family thought to be essential in morphogenesis and development. We show here that in vertebrate cells, Dlx genes appear to be part of a regulatory cascade initiated by acute lymphoblastic leukemia (ALL)-1, a master regulator gene whose disruption is implicated in several human acute leukemias. The expression of Dlx2, Dlx3, Dlx5, Dlx6, and Dlx7 was absent in All-1 -/- mouse embryonic stem cells and reduced in All-1 +/- cells. In leukemic patients affected by the t(4;11)(q21;q23) chromosomal abnormality, the expression of DLX2, DLX3, and DLX4 was virtually abrogated. Our data indicate that Dlx genes are downstream targets of ALL-1 and could be considered as important tools for the study of the early leukemic cell phenotype.
Key Words: trithorax RT-PCR HOM-C ES cells
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