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Blood, 1 February 2008, Vol. 111, No. 3, pp. 1634-1643.
Prepublished online as a Blood First Edition Paper on November 19, 2007; DOI 10.1182/blood-2007-04-081125.
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Submitted April 2, 2007
Accepted November 8, 2007
Gene transactivation without direct DNA-binding defines a novel gain-of-function for PML-RAR
Sake van Wageningen, Marleen C Breems-de Ridder, Jeannet Nigten, Gorica Nikoloski, Claudia A.J. Erpelinck-Verschueren, Bob Lowenberg, Theo de Witte, Daniel G. Tenen, Bert A. van der Reijden, and Joop H. Jansen*
Central Hematology Laboratory and Dept. of Hematology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands
Institute of Hematology, Erasmus Medical Centre Rotterdam, Rotterdam, Netherlands
Harvard Institutes of Medicine, Harvard Medical School and Harvard Stem Cell Institute, Boston, MA, United States
* Corresponding author; email: j.jansen{at}chl.umcn.nl.
PML-RAR is the causative oncogene in 5-10% of the cases of acute myeloid leukemia. At physiological concentrations of retinoic acid PML-RAR silences RAR target genes, blocking differentiation of the cells. At high concentrations of ligand, it (re)activates the transcription of target genes, forcing terminal differentiation. The study of RAR target genes that mediate this differentiation has identified several genes that are important for proliferation and differentiation control in normal and malignant hematopoietic cells. In this paper we show that the PML-RAR fusion protein not only interferes with the transcription of regular RAR target genes. We show that the ID1 and ID2 promoters are activated by PML-RAR but, unexpectedly, not by wild type RAR /RXR. Our data support a model in which the PML-RAR fusion protein regulates a novel class of target genes by interaction with the Sp1 and NF-Y transcription factors, without directly binding to the DNA, defining a gain-of-function for the oncoprotein.

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