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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.
NEOPLASIA AML1-FOG2 fusion protein in myelodysplasiaFrom the Departments of Medicine, Pediatrics, and Medical & Molecular Genetics, Indiana University School of Medicine, and the Indiana University Cancer Center, Indianapolis, IN; Genzyme Genetics, Santa Fe, NM; Department of Medicine, University of New South Wales, Sydney, Australia; Monterey Bay Oncology Center, Monterey, CA; Scripps Research Institute, La Jolla, CA; City of Hope National Medical Center, Duarte, CA; National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD; Departments of Medicine and Pathology, and the Cancer Research & Treatment Center, University of New Mexico, Albuquerque, NM.
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 acute myeloid leukemia 1 (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 t(X;21)(p22.3;q22.1) in a patient with myelodysplasia that fuses AML1 in-frame to the novel partner gene 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 C-terminal binding protein (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 GATAdevelopmental programs in the pathogenesis of myelodysplasia.
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