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

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Chen, K-Y; Srinivasan, T; Tung, K-L; Belmonte, JM; Wang, L; Murthy, PKL; Choi, J; Rakhilin, N; King, S; Varanko, AK; Witherspoon, M; Nishimura, N; Glazier, JA; Lipkin, SM; Bu, P; Shen, X

Published Date

  • April 28, 2017

Published In

Volume / Issue

  • 13 / 4

Start / End Page

  • 927 -

PubMed ID

  • 28455349

Pubmed Central ID

  • 28455349

Electronic International Standard Serial Number (EISSN)

  • 1744-4292

International Standard Serial Number (ISSN)

  • 1744-4292

Digital Object Identifier (DOI)

  • 10.15252/msb.20167324

Language

  • eng