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Kaiso/p120-catenin and TCF/beta-catenin complexes coordinately regulate canonical Wnt gene targets

Jae-Il Park1, Si Wan Kim, Jon P Lyons

  • 1Department of Biochemistry and Molecular Biology, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, USA.

Developmental Cell
|June 7, 2005
PubMed

Insights

Kaiso protein represses Wnt gene targets in development. P120-catenin relieves this repression, revealing a convergence of signaling pathways in vertebrate development and cancer.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Canonical Wnt signaling is crucial for animal development and cancer.
  • TCF/LEF transcription factors mediate Wnt pathway effects.
  • Kaiso is a BTB/POZ zinc finger protein with known roles in gene regulation.

Purpose of the Study:

  • To investigate the role of Kaiso in canonical Wnt signaling.
  • To elucidate the interaction between Kaiso, TCF/LEF, and beta-catenin.
  • To understand the functional implications of Kaiso-mediated repression in development and disease.

Main Methods:

  • Xenopus laevis model system.
  • Analysis of Wnt target gene expression (Siamois, c-Fos, Cyclin-D1, c-Myc).
  • Co-immunoprecipitation assays to study protein interactions.
  • Functional assays including axis duplication and rescue experiments.

Main Results:

  • Kaiso directly represses canonical Wnt gene targets, including Siamois, in conjunction with TCF/LEF.
  • p120-catenin relieves Kaiso-mediated repression of Siamois.
  • Kaiso and TCF/LEF associate, and their combined action leads to enhanced Siamois expression.
  • Kaiso suppresses beta-catenin-induced axis duplication, and TCF-3 rescues Kaiso depletion phenotypes.

Conclusions:

  • A novel regulatory mechanism involving Kaiso and p120-catenin in Wnt signaling is identified.
  • Convergence of parallel p120-catenin/Kaiso and beta-catenin/TCF signaling pathways regulates gene expression.
  • These findings have implications for understanding vertebrate development and carcinogenesis.

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