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Dominant-negative mutations of CEBPA, encoding CCAAT/enhancer binding protein-α (C/EBPα), in acute myeloid leukemia

Abstract

The transcription factor C/EBPα (for CCAAT/enhancer binding protein-α; encoded by the gene CEBPA) is crucial for the differentiation of granulocytes. Conditional expression of C/EBPα triggers neutrophilic differentiation, and no mature granulocytes are observed in Cebpa-mutant mice. Here we identify heterozygous mutations in CEBPA in ten patients with acute myeloid leukemia (AML). We found that five mutations in the amino terminus truncate the full-length protein, but did not affect a 30-kD protein initiated further downstream. The mutant proteins block wild-type C/EBPα DNA binding and transactivation of granulocyte target genes in a dominant-negative manner, and fails to induce granulocytic differentiation. Ours is the first report of CEBPA mutations in human neoplasia, and such mutations are likely to induce the differentiation block found in AML.

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Figure 1: Diagrammatic representation of proteins encoded by wild-type and mutant CEBPA alleles.
Figure 2: Identification of proteins encoded by wild-type and mutated CEBPA alleles in vitro and in vivo.
Figure 3: DNA binding of C/EBPα mutant proteins and inhibition of wild-type C/EBPα binding.
Figure 4: Wild-type and mutant C/EBPα proteins are localized to the nucleus.
Figure 5: Transactivation potential of mutated CEBPA versus wild type.
Figure 6: Conditional expression of CEBPA mutant 263–269del fails to induce granulocytic differentiation and expression of CEBPA target genes in myeloid precursor cells.

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Acknowledgements

We thank C. Schoch for assistance with cytogenetic analysis and T. Haferlach for morphologic analysis of patient samples; members of the Tenen laboratory, A. Iwama and G. Gilliland for suggestions; L. Clayton for careful reading of the manuscript; and M. Singleton for assistance with preparation of the manuscript. This work was supported by grants from the Swiss National Science Foundation (81BS-051911 and SSMBS 1011) and the Swiss Roche Research Foundation (97-189) (to T.P.), and NIH grants CA72009 and HL56745 (to D.G.T.).

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Correspondence to Daniel G. Tenen.

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Pabst, T., Mueller, B., Zhang, P. et al. Dominant-negative mutations of CEBPA, encoding CCAAT/enhancer binding protein-α (C/EBPα), in acute myeloid leukemia. Nat Genet 27, 263–270 (2001). https://doi.org/10.1038/85820

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