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2005 ; ä (ä): 1-17
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Wnt signaling
#MMPMID18050402
Eisenmann DM
WormBook
2005[Jun]; ä (ä): 1-17
PMID18050402
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The use of Wnt ligands for signaling between cells is a conserved feature of
metazoan development. Activation of Wnt signal transduction pathways upon ligand
binding can regulate diverse processes including cell proliferation, migration,
polarity, differentiation and axon outgrowth. A 'canonical' Wnt signaling pathway
has been elucidated in vertebrate and invertebrate model systems. In the
canonical pathway, Wnt binding leads to the stabilization of the transcription
factor beta-catenin, which enters the nucleus to regulate Wnt pathway target
genes. However, Wnt binding also acts through beta-catenin-independent,
noncanonical pathways, such as the planar cell polarity (PCP) pathway and a
pathway involving Ca2+ signaling. This chapter examines our current understanding
of Wnt signaling and Wnt-mediated processes in the nematode C. elegans. Like
other species, the C. elegans genome encodes multiple genes for Wnt ligands
(five) and Wnt receptors (four frizzleds, one Ryk/Derailed). Unlike vertebrates
or Drosophila, the C. elegans genome encodes three beta-catenin genes, which
appear to have distinct functions in Wnt signaling and cell adhesion. Canonical
Wnt signaling clearly exists in C. elegans, utilizing the beta-catenin BAR-1.
However, a noncanonical pathway utilizing the beta-catenin WRM-1 also exists, and
to date a similar pathway has not been described in other species. Evidence for
beta-catenin independent noncanonical Wnt signaling is currently limited. The
role of Wnt signaling in over a dozen C. elegans developmental processes,
including the regulation of cell fate, polarity and migration, is described.