Interaction between Wnt and TGF-β signalling pathways during formation of Spemann's organizer
Copyright policy )Interaction between Wnt and TGF-β signalling pathways during formation of Spemann's organizer
Members of the Wnt and TGF-beta superfamilies regulate both cell fate and proliferation during development and tissue maintenance. In the early amphibian embryo, the Wnt and TGF-beta superfamily signalling cascades are required for the establishment of a dorsal signalling centre, Spemann's organizer. Intracellular proteins of both pathways, upon activation, translocate to the nucleus to participate in transcription. Here we show that beta-catenin and Lef1/Tcf, which are downstream components of the Wnt signalling cascade, form a complex with Smad4, an essential mediator of signals initiated by members of the TGF-beta growth factor superfamily. In Xenopus, this interaction directly and synergistically affects expression of the twin (Xtwn) gene during formation of the organizer. This is, to our knowledge, the first demonstration of a physical interaction between TGF-beta and Wnt signalling components in vivo.
- University of California, Irvine United States
- California Institute of Technology United States
- National Institute for Basic Biology Japan
Homeodomain Proteins, Xenopus, Organizers, Embryonic, DNA Footprinting, Gene Expression Regulation, Developmental, Smad Proteins, 3T3 Cells, Xenopus Proteins, Cell Line, DNA-Binding Proteins, Wnt Proteins, Cytoskeletal Proteins, Mice, Transforming Growth Factor beta, Proto-Oncogene Proteins, Trans-Activators, Animals, Nerve Growth Factors, Signal Transduction, Smad4 Protein
Homeodomain Proteins, Xenopus, Organizers, Embryonic, DNA Footprinting, Gene Expression Regulation, Developmental, Smad Proteins, 3T3 Cells, Xenopus Proteins, Cell Line, DNA-Binding Proteins, Wnt Proteins, Cytoskeletal Proteins, Mice, Transforming Growth Factor beta, Proto-Oncogene Proteins, Trans-Activators, Animals, Nerve Growth Factors, Signal Transduction, Smad4 Protein
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