Abstract
Earlier reports have suggested that the BCR/ABL oncogene, associated with chronic myeloid leukemia, induces a mutator phenotype; however, it is unclear whether this leads to long-term changes in chromosomes and whether the phenotype is found in primary chronic myelogeneous leukemia (CML) cells. We have addressed both these issues. BCR/ABL-expressing cell lines show an increase in DNA breaks after treatment with etoposide as compared to control cells. However, although BCR/ABL-expressing cell lines have an equivalent cell survival, they have an increase in chromosomal translocations after DNA repair as compared to control cells. This demonstrates that BCR/ABL expression decreases the fidelity of DNA repair. To see whether this is true in primary CML samples, normal CD34+ progenitor cells and CML progenitor cells were treated with etoposide. CML progenitor cells have equivalent survival but have an increase in DNA double-strand breaks (DSBs). Spectral karyotyping demonstrates new chromosomal translocations in CML cells, but not normal progenitor cells, consistent with error-prone DNA repair. Taken together, these data demonstrate that BCR/ABL enhances the accumulation of DSBs and alters the apoptotic threshold in CML leading to error-prone DNA repair.
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Acknowledgements
MC is a Clinical Scholar of the Leukemia Lymphoma Society and is supported by NCI R01CA100885. This research was supported (in part) by the Intramural Research Program of the National Institutes of Health, National Cancer Institute, Center for Cancer Research. We thank Tomasz Skorski and colleagues for sharing data prior to publication. JD, PVS, BAB and HP-N performed experiments. MEP performed statistical analysis. TR provided reagents and expertise. MC supervised the experiments and wrote the papers.
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Dierov, J., Sanchez, P., Burke, B. et al. BCR/ABL induces chromosomal instability after genotoxic stress and alters the cell death threshold. Leukemia 23, 279–286 (2009). https://doi.org/10.1038/leu.2008.308
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DOI: https://doi.org/10.1038/leu.2008.308
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