Abstract
The leukemia-associated fusion gene AML1/MDS1/EVI1 (AME) encodes a chimeric transcription factor that results from the (3;21)(q26;q22) translocation. This translocation is observed in patients with therapy-related myelodysplastic syndrome (MDS), with chronic myelogenous leukemia during the blast crisis (CML-BC), and with de novo or therapy-related acute myeloid leukemia (AML). AME is obtained by in-frame fusion of the AML1 and MDS1/EVI1 genes. We have previously shown that AME is a transcriptional repressor that induces leukemia in mice. In order to elucidate the role of AME in leukemic transformation, we investigated the interaction of AME with the transcription co-regulator CtBP1 and with members of the histone deacetylase (HDAC) family. In this report, we show that AME physically interacts in vivo with CtBP1 and HDAC1 and that these co-repressors require distinct regions of AME for interaction. By using reporter gene assays, we demonstrate that AME represses gene transcription by CtBP1-dependent and CtBP1-independent mechanisms. Finally, we show that the interaction between AME and CtBP1 is biologically important and is necessary for growth upregulation and abnormal differentiation of the murine hematopoietic precursor cell line 32Dc13 and of murine bone marrow progenitors.
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Acknowledgements
We thank Ms S Sitailo for technical assistance. We thank Dr R Baer (Columbia University) for the CtBP1-Flag-pCMV plasmid and Dr SL Schreiber (Harvard University) for the HDACs-Flag-pBJ5.1 plasmids. This work was supported by NIH-NCI grants CA67189 and CA72675 (G Nucifora), and by a translation research award from the Leukemia and Lymphoma Society (G Nucifora). G Nucifora is a Scholar of the Leukemia and Lymphoma Society.
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Senyuk, V., Chakraborty, S., Mikhail, F. et al. The leukemia-associated transcription repressor AML1/MDS1/EVI1 requires CtBP to induce abnormal growth and differentiation of murine hematopoietic cells. Oncogene 21, 3232–3240 (2002). https://doi.org/10.1038/sj.onc.1205436
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DOI: https://doi.org/10.1038/sj.onc.1205436
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