TY - JOUR
T1 - Transcription factor Zic2 inhibits Wnt/β-catenin protein signaling
AU - Pourebrahim, Rasoul
AU - Houtmeyers, Rob
AU - Ghogomu, Stephen
AU - Janssens, Sylvie
AU - Thelie, Aurore
AU - Tran, Hong Thi
AU - Langenberg, Tobias
AU - Vleminckx, Kris
AU - Bellefroid, Eric
AU - Cassiman, Jean Jacques
AU - Tejpar, Sabine
PY - 2011/10/28
Y1 - 2011/10/28
N2 - The Zic transcription factors play critical roles during embryonic development. Mutations in the ZIC2 gene are associated with human holoprosencephaly, but the etiology is still unclear. Here, we report a novel function for ZIC2 as a regulator of β-catenin·TCF4-mediated transcription. We show that ZIC2 can bind directly to the DNA-binding high mobility group box of TCF4 via its zinc finger domain and inhibit the transcriptional activity of the β-catenin·TCF4 complex. However, the binding of TCF4 to DNA was not affected by ZIC2. Zic2 RNA injection completely inhibited β-catenin-induced axis duplication in Xenopus embryos and strongly blocked the ability of β-catenin to induce expression of known Wnt targets in animal caps. Moreover, Zic2 knockdown in transgenic Xenopus Wnt reporter embryos led to ectopic Wnt signaling activity mainly at the midbrain-hindbrain boundary. Together, our results demonstrate a previously unknown role for ZIC2 as a transcriptional regulator of the β- catenin·TCF4 complex.
AB - The Zic transcription factors play critical roles during embryonic development. Mutations in the ZIC2 gene are associated with human holoprosencephaly, but the etiology is still unclear. Here, we report a novel function for ZIC2 as a regulator of β-catenin·TCF4-mediated transcription. We show that ZIC2 can bind directly to the DNA-binding high mobility group box of TCF4 via its zinc finger domain and inhibit the transcriptional activity of the β-catenin·TCF4 complex. However, the binding of TCF4 to DNA was not affected by ZIC2. Zic2 RNA injection completely inhibited β-catenin-induced axis duplication in Xenopus embryos and strongly blocked the ability of β-catenin to induce expression of known Wnt targets in animal caps. Moreover, Zic2 knockdown in transgenic Xenopus Wnt reporter embryos led to ectopic Wnt signaling activity mainly at the midbrain-hindbrain boundary. Together, our results demonstrate a previously unknown role for ZIC2 as a transcriptional regulator of the β- catenin·TCF4 complex.
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U2 - 10.1074/jbc.M111.242826
DO - 10.1074/jbc.M111.242826
M3 - Article
C2 - 21908606
AN - SCOPUS:80054823550
SN - 0021-9258
VL - 286
SP - 37732
EP - 37740
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 43
ER -