Spatial Patterning from an Integrated Wnt/β-catenin and Notch/Delta Gene Circuit

Annu Int Conf IEEE Eng Med Biol Soc. 2018 Jul:2018:5022-5025. doi: 10.1109/EMBC.2018.8513462.

Abstract

Classically, the Wnt/β-catenin and Notch /Delta signaling pathways were thought to operate through separate mechanisms, performing distinct roles in tissue patterning. However, it has been shown that b-catenin activates transcription of Hesl, a signaling intermediate in the Notch /Delta pathway that controls its lateral inhibition mechanism. To investigate this non-canonical crosstalk mechanism, a new gene circuit, integrating the two pathways, is proposed and simulated in two-cell and multi-cell environments. This model also captures both Paneth cell- mediated and mesenchymal Wnt production. The simulations verify that the gene circuit is temporally bistable and capable of forming a pattern on a multi-cell grid. Last, the model exhibits a bifurcation based on the steady state concentration of Wnt and the relative amount of control b-catenin has over the Hesl promoter, providing a possible mechanism to explain why a homogeneous population of transit amplifying cells is observed directly above the more diverse stem niche.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Computer Simulation
  • Gene Regulatory Networks*
  • Humans
  • Models, Biological
  • Paneth Cells / physiology
  • Promoter Regions, Genetic
  • Receptors, Notch / genetics*
  • Transcription Factor HES-1 / metabolism*
  • Wnt Signaling Pathway*

Substances

  • Receptors, Notch
  • Transcription Factor HES-1
  • HES1 protein, human