The Xenopus Wnt effector XTcf-3 interacts with Groucho-related transcriptional repressors

Jeroen Roose, Miranda Molenaar, Josi Peterson, Jolanda Hurenkamp, Helen Brantjes, Petra Moerer, Marc van de Wetering, Olivier Destrée and Hans Clevers ()
Additional contact information
Jeroen Roose: University Hospital
Miranda Molenaar: Hubrecht Laboratory, Netherlands Institute for Developmental Biology
Josi Peterson: Hubrecht Laboratory, Netherlands Institute for Developmental Biology
Jolanda Hurenkamp: University Hospital
Helen Brantjes: University Hospital
Petra Moerer: University Hospital
Marc van de Wetering: University Hospital
Olivier Destrée: Hubrecht Laboratory, Netherlands Institute for Developmental Biology
Hans Clevers: University Hospital

Nature, 1998, vol. 395, issue 6702, 608-612

Abstract: Abstract Tcf/Lef transcription factors mediate signalling from Wingless/Wnt proteins by recruiting Armadillo/β-catenin as a transcriptional co-activator1,2,3,4,5,6,7. However, studies of Drosophila, Xenopus and Caenorhabditis elegans have indicated that Tcf factors may also be transcriptional repressors6,8,9,10,11,12,13. Here we show that Tcf factors physically interact with members of the Groucho family of transcriptional repressors. In transient transfection assays, the Xenopus Groucho homologue XGrg-4 inhibited activation of transcription of synthetic Tcf reporter genes. In contrast, the naturally truncated Groucho-family member XGrg-5 enhanced transcriptional activation. Injection of XGrg-4 into Xenopus embryos repressed transcription of Siamois and Xnr-3, endogenous targets of β-catenin–Tcf. Dorsal injection of XGrg-4 had a ventralizing effect on Xenopus embryos. Secondary-axis formation induced by a dominant-positive Armadillo–Tcf fusion protein was inhibited by XGrg-4 and enhanced by XGrg-5. These data indicate that expression of Tcf target genes is regulated by a balance between Armadillo and Groucho.

Date: 1998
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DOI: 10.1038/26989

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