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Development 2003 Sep 01;13018:4295-305. doi: 10.1242/dev.00674.
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Wise, a context-dependent activator and inhibitor of Wnt signalling.

Itasaki N , Jones CM , Mercurio S , Rowe A , Domingos PM , Smith JC , Krumlauf R .

We have isolated a novel secreted molecule, Wise, by a functional screen for activities that alter the anteroposterior character of neuralised Xenopus animal caps. Wise encodes a secreted protein capable of inducing posterior neural markers at a distance. Phenotypes arising from ectopic expression or depletion of Wise resemble those obtained when Wnt signalling is altered. In animal cap assays, posterior neural markers can be induced by Wnt family members, and induction of these markers by Wise requires components of the canonical Wnt pathway. This indicates that in this context Wise activates the Wnt signalling cascade by mimicking some of the effects of Wnt ligands. Activation of the pathway was further confirmed by nuclear accumulation of beta-catenin driven by Wise. By contrast, in an assay for secondary axis induction, extracellularly Wise antagonises the axis-inducing ability of Wnt8. Thus, Wise can activate or inhibit Wnt signalling in a context-dependent manner. The Wise protein physically interacts with the Wnt co-receptor, lipoprotein receptor-related protein 6 (LRP6), and is able to compete with Wnt8 for binding to LRP6. These activities of Wise provide a new mechanism for integrating inputs through the Wnt coreceptor complex to modulate the balance of Wnt signalling.

PubMed ID: 12900447
Article link: Development

Species referenced: Xenopus laevis
Genes referenced: dvl2 egr2 emx2 en2 hoxb9 hsp70 hspa1l lrp6 muc2 muc2l nodal3.2 nog odc1 rax sia1 snai2 sostdc1 sox3 wnt8a
Morpholinos: sostdc1 MO1 sostdc1 MO2

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