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¹ Division of Oncology Research, Mayo Clinic, Rochester, MN 55905
² Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT 06520

Correspondence to Junjie Chen: Junjie.Chen{at}yale.edu; or Zhenkun Lou: Lou.Zhenkun{at}mayo.edu

The importance of the DNA damage response (DDR) pathway in development, genomic stability, and tumor suppression is well recognized. Although 53BP1 and MDC1 have been recently identified as critical upstream mediators in the cellular response to DNA double-strand breaks, their relative hierarchy in the ataxia telangiectasia mutated (ATM) signaling cascade remains controversial. To investigate the divergent and potentially overlapping functions of MDC1 and 53BP1 in the ATM response pathway, we generated mice deficient for both genes. Unexpectedly, the loss of both MDC1 and 53BP1 neither significantly increases the severity of defects in DDR nor increases tumor incidence compared with the loss of MDC1 alone. We additionally show that MDC1 regulates 53BP1 foci formation and phosphorylation in response to DNA damage. These results suggest that MDC1 functions as an upstream regulator of 53BP1 in the DDR pathway and in tumor suppression.

Abbreviations used in this paper: ATM, ataxia telangiectasia mutated; BRCT, BRCA1 C terminal; CSR, class-switch recombination; DDR, DNA damage response; DKO, double KO; HR, homologous recombination; IR, ionizing radiation; KO, knockout; MEF, mouse embryonic fibroblast; MMC, mitomycin C; WT, wild type.

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• Kinner, A., Wu, W., Staudt, C., Iliakis, G. (2008). {gamma}-H2AX in recognition and signaling of DNA double-strand breaks in the context of chromatin. Nucleic Acids Res 36: 5678-5694 [Abstract] [Full Text]  

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