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Evasion of p53 and G2/M checkpoints are characteristic of Hh-driven basal cell carcinoma

Oncogene volume 33, pages 2674–2680 (2014)Cite this article

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Abstract

Basal cell carcinoma (BCC), the most common type of cancer, is characterized by aberrant Hedgehog (Hh) pathway activity. Mutations in pathway components, such as PATCHED1 (PTCH1), are commonly found in BCC. While the tumor suppressor role of PTCH1 in BCC is well established, how Hh pathway activation disrupts normal skin homeostasis to promote BCC formationremains poorly understood. Like Ptc1, Sufu is a major negative regulator of the Hh pathway. Previously, we showed that inactivation of Sufu in the skin does not result in BCC formation. Why loss of Ptc1, but not Sufu, in the epidermis induces BCC formation is unclear. In this report, we utilized gene expression profiling to identify biological pathways and processes that distinguish Sufu from Ptc1 mutants, and discovered a novel role for Sufu in cell cycle regulation. We demonstrated that the Hh pathway activation inSufu and Ptc1 mutant skin is associated with abnormal cell cycle entry, ectopic expression of D-type cyclins and increasedDNA damage. However, despite the presence of DNA damage, p53 stabilization was impaired in the mutant skin. Alternative mechanism to halt genomic instability is the activation of G2/M cell cycle checkpoint, which can occur independent of p53. We found that while Ptc1 mutant cells continue to cycle, which would favor genomic instability, loss of Sufu results in G2/M cell cycle arrest.This finding may explain why inactivation of Sufu is not sufficient to drive BCC formation. Taken together, these studies revealed a unique role for Sufu in G2/M phase progression, and uncovered the molecular and cellular features associated with Hh-driven BCC.

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Acknowledgements

We thank E Nieuwenhuis and W Nien for initial characterization of the Sufu and Ptc1 mutants, and T Satkunendran for technical help. This research is funded by the Canadian Cancer Society Research Institute (2011-700774) to CCH.

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Authors and Affiliations

  1. Program in Developmental & Stem Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada

    Z J Li, S C Mack, T H Mak, M D Taylor & C-C Hui

  2. Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada

    Z J Li & C-C Hui

  3. Division of Neurosurgery, Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada

    S C Mack & M D Taylor

  4. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada

    S C Mack & M D Taylor

  5. Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada

    S Angers

  6. Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada

    S Angers

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Correspondence to C-C Hui.

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Li, Z., Mack, S., Mak, T. et al. Evasion of p53 and G2/M checkpoints are characteristic of Hh-driven basal cell carcinoma. Oncogene 33, 2674–2680 (2014). https://doi.org/10.1038/onc.2013.212

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