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2017 ; 13
(4
): e1006700
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Probing the canonicity of the Wnt/Wingless signaling pathway
#MMPMID28369070
Franz A
; Shlyueva D
; Brunner E
; Stark A
; Basler K
PLoS Genet
2017[Apr]; 13
(4
): e1006700
PMID28369070
show ga
The hallmark of canonical Wnt signaling is the transcriptional induction of Wnt
target genes by the beta-catenin/TCF complex. Several studies have proposed
alternative interaction partners for beta-catenin or TCF, but the relevance of
potential bifurcations in the distal Wnt pathway remains unclear. Here we study
on a genome-wide scale the requirement for Armadillo (Arm, Drosophila
beta-catenin) and Pangolin (Pan, Drosophila TCF) in the Wnt/Wingless(Wg)-induced
transcriptional response of Drosophila Kc cells. Using somatic genetics, we
demonstrate that both Arm and Pan are absolutely required for mediating
activation and repression of target genes. Furthermore, by means of
STARR-sequencing we identified Wnt/Wg-responsive enhancer elements and found that
all responsive enhancers depend on Pan. Together, our results confirm the dogma
of canonical Wnt/Wg signaling and argue against the existence of distal pathway
branches in this system.