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The effect of Hus1 on ionizing radiation sensitivity is associated with homologous recombination repair but is independent of nonhomologous end-joining

Oncogene volume 25, pages 1980–1983 (2006)Cite this article

A Corrigendum to this article was published on 21 February 2008

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Abstract

Mammalian Hus1 plays an important role in maintaining genomic integrity. Cells lacking mouse Hus1 are hypersensitive to DNA damage inducers including UV and camptothecin (CPT). By using clonogenic assay, we show here that Hus1 deficient mouse cells are hypersensitive to ionizing radiation (IR) compared with their Hus1-positive counterparts. However, these cells show similar induction levels and similar rejoining rates of DNA double strand breaks (DSBs) following IR, indicating that the effect of Hus1 on cell radiosensitivity is independent of nonhomologous end-joining (NHEJ). By combining an I-SceI-induced-DNA DSBs system and a siRNA approach, we also show that knocking down Hus1 decreases the efficiency of homologous recombination repair (HRR), which is associated with the cellular sensitivity to IR-induced killing. Together, these results indicate that the role of Hus1 affecting the sensitivity of cells to IR-induced killing is independent of NHEJ but might be linked to HRR.

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Acknowledgements

We thank Drs M Jasin and JA Nickoloff for reagents and Nancy Mott for help in the preparation of the manuscript. This work is supported by a grant from NASA NAG2-1628 (to YW) and by grant NIH RO1 CA108773 (to RSW).

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Authors and Affiliations

  1. Department of Radiation Oncology and Kimmel Cancer Center of Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA, USA

    X Wang, B Hu & Y Wang

  2. Beijing Institute of Biotechnology, Beijing, China

    B Hu

  3. Department of Biomedical Sciences, Cornell University, Ithaca, NY, USA

    R S Weiss

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  1. X Wang
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  2. B Hu
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  4. Y Wang
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Correspondence to Y Wang.

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Wang, X., Hu, B., Weiss, R. et al. The effect of Hus1 on ionizing radiation sensitivity is associated with homologous recombination repair but is independent of nonhomologous end-joining. Oncogene 25, 1980–1983 (2006). https://doi.org/10.1038/sj.onc.1209212

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