Feedback in the β-catenin destruction complex imparts bistability and cellular memory

Mary Jo Cantoria, Elaheh Alizadeh, Janani Ravi, Reeba P. Varghese, Nawat Bunnag, Kelvin W. Pond, Arminja N. Kettenbach, Yashi Ahmed, Andrew L. Paek, John J. Tyson, Konstantin Doubrovinski, Ethan Lee, Curtis A. Thorne

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Wnt ligands are considered classical morphogens, for which the strength of the cellular response is proportional to the concentration of the ligand. Herein, we show an emergent property of bistability arising from feedback among the Wnt destruction complex proteins that target the key transcriptional co-activator β-catenin for degradation. Using biochemical reconstitution, we identified positive feedback between the scaffold protein Axin and the kinase glycogen synthase kinase 3 (GSK3). Theoretical modeling of this feedback between Axin and GSK3 suggested that the activity of the destruction complex exhibits bistable behavior. We experimentally confirmed these predictions by demonstrating that cellular cytoplasmic β-catenin concentrations exhibit an “all-or-none” response with sustained memory (hysteresis) of the signaling input. This bistable behavior was transformed into a graded response and memory was lost through inhibition of GSK3. These findings provide a mechanism for establishing decisive, switch-like cellular response and memory upon Wnt pathway stimulation.

Original languageEnglish (US)
Article numbere2208787120
JournalProceedings of the National Academy of Sciences of the United States of America
Volume120
Issue number2
DOIs
StatePublished - Jan 10 2023

Keywords

  • Wnt signaling
  • bistability
  • signal transduction

ASJC Scopus subject areas

  • General

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