The latest study from the Jill Roberts Institute, "CX3CR1+ mononuclear phagocytes control immunity to intestinal fungi," was published on January 11 in Science. To read more, click here.  Dr. Gregory Sonnenberg wins inaugural award from the Society for Mucosal Immunology. To read more, click here.  The Kenneth Rainin Foundation awarded Dr. Iliyan Iliev and colleagues from Mount Sinai a $250,000 Synergy Award to examine the composition of the fungal community in babies born to mothers with inflammatory bowel disease. To read more, click here. Dr. Randy Longman received the Irma T. Hirschl Career Scientist Award and the New York Crohn’s Foundation Award.    

The Jill Roberts Institute for Research in Inflammatory Bowel Disease

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A Notch positive feedback in the intestinal stem cell niche is essential for stem cell self-renewal.

TitleA Notch positive feedback in the intestinal stem cell niche is essential for stem cell self-renewal.
Publication TypeJournal Article
Year of Publication2017
AuthorsChen, K-Y, Srinivasan, T, Tung, K-L, Belmonte, JM, Wang, L, Murthy, PKadur Laks, Choi, J, Rakhilin, N, King, S, Varanko, AKristine, Witherspoon, M, Nishimura, N, Glazier, JA, Lipkin, SM, Bu, P, Shen, X
JournalMol Syst Biol
Date Published2017 Apr 28

The intestinal epithelium is the fastest regenerative tissue in the body, fueled by fast-cycling stem cells. The number and identity of these dividing and migrating stem cells are maintained by a mosaic pattern at the base of the crypt. How the underlying regulatory scheme manages this dynamic stem cell niche is not entirely clear. We stimulated intestinal organoids with Notch ligands and inhibitors and discovered that intestinal stem cells employ a positive feedback mechanism via direct Notch binding to the second intron of the Notch1 gene. Inactivation of the positive feedback by CRISPR/Cas9 mutation of the binding sequence alters the mosaic stem cell niche pattern and hinders regeneration in organoids. Dynamical system analysis and agent-based multiscale stochastic modeling suggest that the positive feedback enhances the robustness of Notch-mediated niche patterning. This study highlights the importance of feedback mechanisms in spatiotemporal control of the stem cell niche.

Alternate JournalMol. Syst. Biol.
PubMed ID28455349
PubMed Central IDPMC5408779
Grant ListR01 GM095990 / GM / NIGMS NIH HHS / United States
R01 GM114254 / GM / NIGMS NIH HHS / United States