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Blood, 1 June 2005, Vol. 105, No. 11, pp. 4523-4526.
Prepublished online as a Blood First Edition Paper on February 10, 2005; DOI 10.1182/blood-2004-07-2762.
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Submitted July 19, 2004
Accepted January 21, 2005
AML1-FOG2 Fusion Protein in Myelodysplasia
Edward M Chan*, Elisha M Comer, Frank C Brown, Kathleen E Richkind, Melissa L Holmes, Beng H Chong, Roger Shiffman, Dong-Er Zhang, Marilyn L Slovak, Cheryl L Willman, Constance T Noguchi, Yanjun Li, Devan J Heiber, Lori Kwan, Rebecca J Chan, Gail H Vance, Heather C Ramsey, and Robert A Hromas
Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA; Indiana University Cancer Center, Indianapolis, IN, USA
Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
Genzyme Genetics, Santa Fe, NM, USA
Department of Medicine, University of New South Wales, Sydney, NSW, Australia
Monterey Bay Oncology Center, Monterey, CA, USA
Scripps Research Institute, La Jolla, CA, USA
City of Hope National Medical Center, Duarte, CA, USA
Department of Pathology, University of New Mexico, Albuquerque, NM, USA; Department of Medicine, University of New Mexico, Albuquerque, NM, USA; Department of Cancer Research & Treatment Center, University of New Mexico, Albuquerque, NM, USA
National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN, USA
Department of Medical & Molecular Genetics, Indiana University School of Medicine, Indianaplis, IN, USA
Department of Medicine, University of New Mexico, Albuquerque, NM, USA
Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Medical & Molecular Genetics, Indiana University School of Medicine, Indianaplis, IN, USA; Indiana University Cancer Center, Indianapolis, IN, USA
Department of Medical & Molecular Genetics, Indiana University School of Medicine, Indianaplis, IN, USA; Indiana University Cancer Center, Indianapolis, IN, USA
Department of Medicine, University of New Mexico, Albuquerque, NM, USA; Department of Cancer Research & Treatment Center, University of New Mexico, Albuquerque, NM, USA
* Corresponding author; email: echan{at}iupui.edu.
Core binding factor (CBF) participates in specification of the hematopoietic stem cell and functions as a critical regulator of hematopoiesis. Translocation or point mutation of AML1/RUNX1, which encodes the DNA-binding subunit of CBF, plays a central role in the pathogenesis of acute myeloid leukemia and myelodysplasia. We characterized the translocation t(X;21)(p22.3;q22.1) in a patient with myelodysplasia that fuses AML1 in-frame to the novel partner gene Friend of GATA-2 (FOG2/ZFPM2). The reciprocal gene fusions AML1-FOG2 and FOG2-AML1 are both expressed. AML1-FOG2, which fuses the DNA-binding domain of AML1 to most of FOG2, represses the transcriptional activity of both CBF and GATA1. AML1-FOG2 retains a motif that recruits the corepressor CtBP and these proteins associate in a protein complex. These results suggest a central role for CtBP in AML1-FOG2 transcriptional repression and implicate coordinated disruption of the AML1 and GATA developmental programs in the pathogenesis of myelodysplasia.

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