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Dazap2 modulates transcription driven by the Wnt effector TCF-4

Jan Lukas1, Petr Mazna, Tomas Valenta

  • 1Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Videnska, Prague 4, Czech Republic.

Nucleic Acids Research
|March 24, 2009
PubMed

Insights

The evolutionary conserved Dazap2 protein interacts with TCF-4, a key Wnt signaling mediator. Dazap2 knockdown affects Wnt signaling activity and target gene expression, revealing its role in transcriptional regulation.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Gene Regulation

Background:

  • The Wnt/beta-catenin signaling pathway regulates gene transcription via Tcf/Lef transcription factors.
  • Tcf/Lef proteins act as activators with beta-catenin or repressors with TLE/Groucho proteins.
  • Mechanisms controlling Tcf/Lef specificity in different cellular contexts are not fully understood.

Purpose of the Study:

  • To identify novel interacting partners of TCF-4.
  • To investigate the role of Dazap2 in Wnt signaling and Tcf/Lef-mediated transcription.

Main Methods:

  • Co-immunoprecipitation to identify TCF-4 interacting partners.
  • Western blotting and reporter assays to assess Wnt signaling activity.
  • Chromatin immunoprecipitation to evaluate TCF-4 DNA binding affinity.

Main Results:

  • Dazap2 was identified as an interacting partner of TCF-4, binding to a region near the HMG box.
  • All Tcf/Lef family members were found to associate with Dazap2.
  • Knockdown of Dazap2 reduced Wnt signaling reporter activity and altered the expression of Wnt target genes.
  • Dazap2 modulates the DNA-binding affinity of TCF-4 for its recognition motif.

Conclusions:

  • Dazap2 is an evolutionarily conserved protein that interacts with TCF-4 and influences Wnt/beta-catenin signaling.
  • Dazap2 plays a regulatory role in Wnt target gene expression by modulating TCF-4 DNA binding.
  • These findings uncover a novel mechanism controlling Tcf/Lef-mediated transcriptional responses.

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