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Zebrafish pten genes have overlapping and non-redundant functions in tumorigenesis and embryonic development

Oncogene volume 27, pages 1079–1086 (2008)Cite this article

Abstract

In human cancer, PTEN (Phosphatase and TENsin homolog on chromosome 10, also referred to as MMAC1 and TEP1) is a frequently mutated tumor suppressor gene. We have used the zebrafish as a model to investigate the role of Pten in embryonic development and tumorigenesis. The zebrafish genome encodes two pten genes, ptena and ptenb. Here, we report that both Pten gene products from zebrafish are functional. Target-selected inactivation of ptena and ptenb revealed that Ptena and Ptenb have redundant functions in embryonic development, in that ptena−/− and ptenb−/− mutants did not show embryonic phenotypes. Homozygous single mutants survived as adults and they were viable and fertile. Double homozygous ptena−/−ptenb−/− mutants died at 5 days post fertilization with pleiotropic defects. These defects were rescued by treatment with the phosphatidylinositol-3-kinase inhibitor, LY294002. Double homozygous embryos showed enhanced cellular proliferation. In addition, cell survival was dramatically enhanced in embryos that lack functional Pten upon γ-irradiation. Surprisingly, adult ptenb−/− zebrafish developed ocular tumors later in life, despite the expression of ptena in adult eyes. We conclude that whereas Ptena and Ptenb have redundant functions in embryonic development, they apparently do not have completely overlapping functions later in life. These pten mutant zebrafish represent a unique model to screen for genetic and/or chemical suppressors of Pten loss-of-function.

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Acknowledgements

We would like to thank John Verhees for initial work on the pten mutant zebrafish and Neeltje Mooy (Ophthalmology, Erasmus Medical Center, Rotterdam) for her pathological analysis of the ocular tumor sections. This work was supported, in part, by a grant from the National Institute of Health (JED). The pten mutants were generated as part of the ZF-MODELS Integrated Project in the 6th Framework Programme (Contract No. LSHG-CT-2003-503496) funded by the European Commission.

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Author notes

  1. G S Taylor

    Present address: 3Current address: Department of Biochemistry and Molecular Biology, University of Nebraska, 985870 Nebraska Medical Center Omaha, NE 68198-5870 Omaha, NE, USA,

Authors and Affiliations

  1. Hubrecht Institute, Utrecht, The Netherlands

    A Faucherre, J Overvoorde & J den Hertog

  2. Departments of Pharmacology, Cellular and Molecular Medicine, and Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA, USA

    G S Taylor & J E Dixon

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  1. A Faucherre
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Correspondence to J den Hertog.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).

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Faucherre, A., Taylor, G., Overvoorde, J. et al. Zebrafish pten genes have overlapping and non-redundant functions in tumorigenesis and embryonic development. Oncogene 27, 1079–1086 (2008). https://doi.org/10.1038/sj.onc.1210730

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