Intrinsic regulation of enteroendocrine fate by Numb |
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Authors: | Jérémy Sallé Louis Gervais Benjamin Boumard Marine Stefanutti Katarzyna Siudeja Allison J Bardin |
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Affiliation: | 1. Institut Curie, PSL Research University, CNRS UMR 3215, INSERM U934, Stem Cells and Tissue Homeostasis Group, Paris, France;2. Sorbonne Universités, UPMC Univ Paris 6, Paris, France;3. Département de Biologie, école Normale Supérieure de Lyon, Lyon, France |
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Abstract: | How terminal cell fates are specified in dynamically renewing adult tissues is not well understood. Here we explore terminal cell fate establishment during homeostasis using the enteroendocrine cells (EEs) of the adult Drosophila midgut as a paradigm. Our data argue against the existence of local feedback signals, and we identify Numb as an intrinsic regulator of EE fate. Our data further indicate that Numb, with alpha‐adaptin, acts upstream or in parallel of known regulators of EE fate to limit Notch signaling, thereby facilitating EE fate acquisition. We find that Numb is regulated in part through its asymmetric and symmetric distribution during stem cell divisions; however, its de novo synthesis is also required during the differentiation of the EE cell. Thus, this work identifies Numb as a crucial factor for cell fate choice in the adult Drosophila intestine. Furthermore, our findings demonstrate that cell‐intrinsic control mechanisms of terminal cell fate acquisition can result in a balanced tissue‐wide production of terminally differentiated cell types. |
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Keywords: | adult intestinal stem cell Drosophila midgut enteroendocrine cells fate homeostasis Numb |
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