Abstract
Bloom syndrome and ataxia-telangiectasia are autosomal recessive human disorders characterized by immunodeficiency, genome instability and predisposition to develop cancer. Recent data reveal that the products of these two genes, BLM and ATM, interact and function together in recognizing abnormal DNA structures. To investigate the function of these two molecules in DNA damage recognition, we generated double knockouts of ATM−/− BLM−/− in the DT40 chicken B-lymphocyte cell line. The double mutant cells were viable and exhibited a variety of characteristics of both ATM−/− and BLM−/− cells. There was no evidence for exacerbation of either phenotype; however, the more extreme radiosensitivity seen in ATM−/− and the elevated sister chromatid exchange seen in BLM−/− cells were retained in the double mutants. These results suggest that ATM and BLM have largely distinct roles in recognizing different forms of damage in DNA, but are also compatible with partially overlapping functions in recognizing breaks in radiation-damaged DNA.
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Acknowledgements
We thank Aine Farrell for technical support and Tracey Laing for typing this manuscript. Support was provided by the Australian National Health and Medical Research Council, the A-T Children's Foundation, the National Institutes of Health USA, the Australia–Japan Co-operative Research Program and the Uehara Research Foundation.
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Fukao, T., Chen, P., Ren, J. et al. Disruption of the BLM gene in ATM-null DT40 cells does not exacerbate either phenotype. Oncogene 23, 1498–1506 (2004). https://doi.org/10.1038/sj.onc.1207276
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DOI: https://doi.org/10.1038/sj.onc.1207276