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Blood, 15 February 2002, Vol. 99, No. 4, pp. 1332-1340

NEOPLASIA

Mutations in the gene encoding the transcription factor CCAAT/enhancer binding protein alpha  in myelodysplastic syndromes and acute myeloid leukemias

Adrian F. Gombart, Wolf-K. Hofmann, Seiji Kawano, Seisho Takeuchi, Utz Krug, Scott H. Kwok, Renee J. Larsen, Hiroya Asou, Carl W. Miller, Dieter Hoelzer, and H. Phillip Koeffler

From Cedars-Sinai Medical Center, Burns and Allen Research Institute, Division of Hematology/Oncology, University of California-Los Angeles School of Medicine; Division of Hematology and Clinical Laboratories, Keio University School of Medicine, Tokyo, Japan; and Department of Hematology, University Hospital, Frankfurt am Main, Germany.

The CCAAT/enhancer binding protein alpha  (C/EBPalpha ) protein is essential for proper lung and liver function and granulocytic and adipose tissue differentation. It was hypothesized that abnormalties in C/EBPalpha function contribute to the development of malignancies in a variety of tissues. To test this, genomic DNA from 408 patient samples and 5 cell lines representing 11 different cancers was screened for mutations in the C/EBPalpha gene. Two silent polymorphisms termed P1 and P2 were present at frequencies of 13.5% and 2.2%, respectively. Of the12 mutations detected in 10 patients, silent changes were identified in one nonsmall cell lung cancer, one prostate cancer, and one acute myelogenous leukemia (AML) subtype M4. The 9 remaining mutations were detected in 1 of 92 (1.1%) myelodysplastic syndrome (MDS) samples and 6 of 78 (7.7%) AML (AML-M2 and AML-M4) samples. Some mutations truncated the predicted protein with loss of the DNA-binding (basic region) and dimerization (leucine zipper [ZIP]) domains by either deletions or nonsense codons. Also, inframe deletions or insertions in the fork region located between the leucine zipper and basic region, or within the leucine zipper, disrupted the alpha -helical phase of the bZIP domain. The inframe deletion and insertion mutations abrogated the transcriptional activation function of C/EBPalpha on the granulocyte colony-stimulating factor receptor promoter. These mutants localized properly to the nucleus, but were unable to bind to the C/EBP site in the promoter and did not possess dominant-negative activity. The mutations in the MDS patient and one AML-M2 patient were biallelic, indicating a loss of C/EBPalpha function. These results suggest that mutation of C/EBPalpha is involved in specific subtypes of AML and in MDS, but may occur rarely in other types of leukemias or nonhematologic malignancies.

© 2002 by The American Society of Hematology.
 

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B.-T. H. Truong, Y.-J. Lee, T. A. Lodie, D. J. Park, D. Perrotti, N. Watanabe, H. P. Koeffler, H. Nakajima, D. G. Tenen, and S. C. Kogan
CCAAT/Enhancer binding proteins repress the leukemic phenotype of acute myeloid leukemia
Blood, February 1, 2003; 101(3): 1141 - 1148.
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J. Rangatia, R. K. Vangala, N. Treiber, P. Zhang, H. Radomska, D. G. Tenen, W. Hiddemann, and G. Behre
Downregulation of c-Jun Expression by Transcription Factor C/EBP{alpha} Is Critical for Granulocytic Lineage Commitment
Mol. Cell. Biol., December 15, 2002; 22(24): 8681 - 8694.
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C. Preudhomme, C. Sagot, N. Boissel, J.-M. Cayuela, I. Tigaud, S. de Botton, X. Thomas, E. Raffoux, C. Lamandin, S. Castaigne, et al.
Favorable prognostic significance of CEBPA mutations in patients with de novo acute myeloid leukemia: a study from the Acute Leukemia French Association (ALFA)
Blood, September 26, 2002; 100(8): 2717 - 2723.
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B. U. Mueller, T. Pabst, M. Osato, N. Asou, L. M. Johansen, M. D. Minden, G. Behre, W. Hiddemann, Y. Ito, and D. G. Tenen
Heterozygous PU.1 mutations are associated with acute myeloid leukemia
Blood, July 18, 2002; 100(3): 998 - 1007.
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