Journal
EMBO JOURNAL
Volume 37, Issue 16, Pages -Publisher
WILEY
DOI: 10.15252/embj.201798659
Keywords
asymmetric cell division; chromatin remodeling; neuroblast; polarity; stem cell
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Funding
- Gottingen Graduate School for Neurosciences, Biophysics, and Molecular Biosciences (GGNB
- DFG grant) [GSC 226]
- Ph.D. program Molecular Biology
- Cluster of Excellence Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB) at the University of Gottingen [171]
- Cluster of Excellence Cellular Stress response in aging-associated diseases (CECAD) at the University of Cologne
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Stem cells establish cortical polarity and divide asymmetrically to simultaneously maintain themselves and generate differentiating offspring cells. Several chromatin modifiers have been identified as stemness factors in mammalian pluripotent stem cells, but whether these factors control stem cell polarity and asymmetric division has not been investigated so far. We addressed this question in Drosophila neural stem cells called neuroblasts. We identified the Tip60 chromatin remodeling complex and its interaction partner Myc as regulators of genes required for neuroblast maintenance. Knockdown of Tip60 complex members results in loss of cortical polarity, symmetric neuroblast division, and premature differentiation through nuclear entry of the transcription factor Prospero. We found that aPKC is the key target gene of Myc and the Tip60 complex subunit Domino in regulating neuroblast polarity. Our transcriptome analysis further showed that Domino regulates the expression of mitotic spindle genes previously identified as direct Myc targets. Our findings reveal an evolutionarily conserved functional link between Myc, the Tip60 complex, and the molecular network controlling cell polarity and asymmetric cell division.
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