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p53-binding protein 1 is fused to the platelet-derived growth factor receptor ? in a patient with a t(5;15)(q33;q22) and an imatinib-responsive eosinophilic myeloproliferative disorder

By Francis H. Grand, Sonja Burgstaller, Thomas Kuhr, E. Joanna Baxter, Gerald Webersinke, Josef Thaler, Andrew J. Chase and Nicholas C.P. Cross

Abstract

We describe the fusion of TP53BP1 to PDGFRB in a patient with a chronic myeloid leukemia-like disorder associated with eosinophilia and a t(5;15)(q33;q22). TP53BP1 encodes 53BP1, a p53-binding protein that plays a role in cellular responses to DNA damage. The 53BP1-PDGFRß fusion protein is predicted to retain the kinetochore-binding domain of 53BP1 fused to the transmembrane and intracellular tyrosine kinase domain of PDGFRß. The presence of the fusion was confirmed by two-color fluorescence in situ hybridization, reverse transcription-PCR, and by characterizing the genomic breakpoints. The reciprocal fusion, which would contain the p53-binding 53BP1 BRCA1 COOH-terminal domains, was not detectable by fluorescence in situ hybridization or nested PCR. Imatinib, a known inhibitor of PDGFRß, blocked the growth of patient colony-forming unit, granulocyte-macrophage in vitro and produced a clinically significant response before relapse and subsequent death with imatinib-resistant disease. We conclude that TP53BP1-PDGFRB is a novel imatinib target in atypical chronic myeloid leukemia. <br/><br/

Topics: RC0254, QH426
Year: 2004
OAI identifier: oai:eprints.soton.ac.uk:24726
Provided by: e-Prints Soton
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