Recently, we have identified stem cells (ISCs) in the Drosophila adult midgut that replenish the intestine throughout the entire lifetime of the animal. Drosophila ISCs, like vertebrate ISCs, are multipotent, producing both enterocytes and enteroendocrine cells. Furthermore, as in vertebrates, Drosophila ISCs utilize Notch signaling to produce an appropriate fraction of enteroendocrine cells and enterocytes. The relatively small cell number and simplicity of the Drosophila midgut allows one to identify ISCs morphologically under various conditions. Moreover, it is possible to remove gene function in marked clones of these cells in order to decipher the nature and directionality of signaling events. Based on our findings we will take advantage of the anatomically simpler but functionally relevant Drosophila system to address the following three specific aims. 1. Determine the cellular and molecular mechanisms that maintain Drosophila ISCs in a stem cell niche. 2. Identify the effects of nutrients, insulin signaling, and developmental signaling pathways like wingless and hedgehog on stem cell division, stability and differentiation. 3. Study how intercellular signals and environmental factors control the differentiation of enteroendocrine cells.

Public Health Relevance

. We have previously shown the maintenance and function of the adult Drosophila midgut bears many striking similarities to that seen in the human intestine. Therefore the results of our research should provide valuable insights into the pathogenesis of human digestive disorders such as intestinal cancers, malabsorption syndromes, and diabetes.

National Institute of Health (NIH)
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Research Project (R01)
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Gastrointestinal Cell and Molecular Biology Study Section (GCMB)
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Carrington, Jill L
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Columbia University (N.Y.)
Schools of Medicine
New York
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Guo, Zheng; Lucchetta, Elena; Rafel, Neus et al. (2016) Maintenance of the adult Drosophila intestine: all roads lead to homeostasis. Curr Opin Genet Dev 40:81-86
Guo, Zheng; Ohlstein, Benjamin (2015) Stem cell regulation. Bidirectional Notch signaling regulates Drosophila intestinal stem cell multipotency. Science 350:
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Guo, Zheng; Driver, Ian; Ohlstein, Benjamin (2013) Injury-induced BMP signaling negatively regulates Drosophila midgut homeostasis. J Cell Biol 201:945-61
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