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Mol Cell 2009 Dec 11;365:872-84. doi: 10.1016/j.molcel.2009.11.017.
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Evidence that fold-change, and not absolute level, of beta-catenin dictates Wnt signaling.

In response to Wnt stimulation, beta-catenin accumulates and activates target genes. Using modeling and experimental analysis, we found that the level of beta-catenin is sensitive to perturbations in the pathway, such that cellular variation would be expected to alter the signaling outcome. One unusual parameter was robust: the fold-change in beta-catenin level (post-Wnt/pre-Wnt). In Xenopus, dorsal-anterior development and target gene expression are robust to perturbations that alter the final level but leave the fold-change intact. These suggest, first, that despite cellular noise, the cell responds reliably to Wnt stimulation by maintaining a robust fold-change in beta-catenin. Second, the transcriptional machinery downstream of the Wnt pathway does not simply read the beta-catenin level after Wnt stimulation but computes fold-changes in beta-catenin. Analogous to Weber's Law in sensory physiology, some gene transcription networks must respond to fold-changes in signals, rather than absolute levels, which may buffer stochastic, genetic, and environmental variation.

PubMed ID: 20005849
PMC ID: PMC2921914
Article link: Mol Cell
Grant support: [+]

Species referenced: Xenopus
Genes referenced: axin1 ctnnb1 frat1 gsk3b nodal3.1 psmd6 sia1 sult2a1 wnt1 wnt3a
GO keywords: beta-catenin binding

Article Images: [+] show captions
References [+] :
Aberle, beta-catenin is a target for the ubiquitin-proteasome pathway. 1997, Pubmed