Zac1 promotes a Müller glial cell fate and interferes with retinal ganglion cell differentiation in Xenopus retina

Authors

  • Lin Ma,

    1. Genes and Development Research Group, HBI, IMCH, 2207 HSC, University of Calgary, Calgary, AB, Canada
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    • L. Ma and J.C. Hocking contributed equally to this study.

  • Jennifer C. Hocking,

    1. Genes and Development Research Group, HBI, IMCH, 2207 HSC, University of Calgary, Calgary, AB, Canada
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    • L. Ma and J.C. Hocking contributed equally to this study.

  • Carrie L. Hehr,

    1. Genes and Development Research Group, HBI, IMCH, 2207 HSC, University of Calgary, Calgary, AB, Canada
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  • Carol Schuurmans,

    1. Genes and Development Research Group, HBI, IMCH, 2207 HSC, University of Calgary, Calgary, AB, Canada
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  • Sarah McFarlane

    Corresponding author
    1. Genes and Development Research Group, HBI, IMCH, 2207 HSC, University of Calgary, Calgary, AB, Canada
    • Genes and Development Research Group, HBI, IMCH, 2207 HSC, University of Calgary, Calgary, AB, Canada, T2N 4N1
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Abstract

The timing of cell cycle exit is tightly linked to cell fate specification in the developing retina. Accordingly, several tumor suppressor genes, which are key regulators of cell cycle exit in cancer cells, play critical roles in retinogenesis. Here we investigated the role of Zac1, a tumor suppressor gene encoding a zinc finger transcription factor, in retinal development. Strikingly, in gain-of-function assays in Xenopus, mouse Zac1 promotes proliferation and apoptosis at an intermediate stage of retinogenesis. Zac1 also influences cell fate decisions, preferentially promoting the differentiation of tumor-like clusters of abnormal neuronal cells in the ganglion cell layer, as well as inducing the formation of supernumerary Müller glial cells at the expense of other cell types. Thus Zac1 has the capacity to influence cell cycle exit, and cell fate specification and differentiation decisions by retinal progenitors, suggesting that further functional studies will uncover new insights into how retinogenesis is regulated. Developmental Dynamics 236:192–202, 2007. © 2006 Wiley-Liss, Inc.

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