Abstract
Sak/Plk4 differs from other polo-like kinases in having only a single polo box, which assumes a novel dimer fold that localizes to the nucleolus, centrosomes and the cleavage furrow. Sak expression increases gradually in S through M phase, and Sak is destroyed by APC/C dependent proteolysis. Sak-deficient mouse embryos arrest at E7.5 and display an increased incidence of apoptosis and anaphase arrest. Sak+/− mice are haploinsufficient for tumor suppression, with spontaneous tumors developing primarily in the liver with advanced age. During liver regeneration following partial hepatectomy, Sak+/− hepatocytes display a delay in reaching the first M phase, multipolar spindles, disorganized tissue morphology and loss of acuity for cyclin B1 expression. Similarly, Sak+/− MEF cells proliferate slowly, and show a high incidence of centrosome hyper-amplification. We suggest that Sak provides feedback to cell cycle regulators, and thereby precision to the switch-like transitions of centrosome duplication and exit-from-mitosis. Sak binds to p53, and studies are underway to provide a molecular context for the Sak-p53 interaction. Animal models of haploinsufficiency and more comprehensive models of cell cycle regulation should contribute to improvements in cancer risk assessment and novel therapies.
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Acknowledgements
This research was supported by a grant from the National Cancer Institute of Canada to JWD and from the National Colorectal Cancer Campaign to CJS. We thank Jennifer C Macmillan and Carla Rosario for technical contributions.
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Swallow, C., Ko, M., Siddiqui, N. et al. Sak/Plk4 and mitotic fidelity. Oncogene 24, 306–312 (2005). https://doi.org/10.1038/sj.onc.1208275
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DOI: https://doi.org/10.1038/sj.onc.1208275
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