Balancing self-renewal and differentiation by asymmetric division: Insights from brain tumor suppressors in Drosophila neural stem cells

Authors

  • Kai Chen Chang,

    1. Neuroscience & Behavioral Disorder Program, Duke-NUS Graduate Medical School Singapore, Singapore, Singapore
    2. Current address: Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
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  • Cheng Wang,

    1. Neuroscience & Behavioral Disorder Program, Duke-NUS Graduate Medical School Singapore, Singapore, Singapore
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  • Hongyan Wang

    Corresponding author
    1. Neuroscience & Behavioral Disorder Program, Duke-NUS Graduate Medical School Singapore, Singapore, Singapore
    2. Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
    3. NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, Singapore
    • Neuroscience & Behavioral Disorder Program, Duke-NUS Graduate Medical School Singapore, Singapore, Singapore.
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Abstract

Balancing self-renewal and differentiation of stem cells is an important issue in stem cell and cancer biology. Recently, the Drosophila neuroblast (NB), neural stem cell has emerged as an excellent model for stem cell self-renewal and tumorigenesis. It is of great interest to understand how defects in the asymmetric division of neural stem cells lead to tumor formation. Here, we review recent advances in asymmetric division and the self-renewal control of Drosophila NBs. We summarize molecular mechanisms of asymmetric cell division and discuss how the defects in asymmetric division lead to tumor formation. Gain-of-function or loss-of-function of various proteins in the asymmetric machinery can drive NB overgrowth and tumor formation. These proteins control either the asymmetric protein localization or mitotic spindle orientation of NBs. We also discuss other mechanisms of brain tumor suppression that are beyond the control of asymmetric division.

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