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Polarized Translocation of Fluorescent Proteins in Xenopus Ectoderm in Response to Wnt Signaling
06:55

Polarized Translocation of Fluorescent Proteins in Xenopus Ectoderm in Response to Wnt Signaling

Published on: May 26, 2011

Traf2- and Nck-interacting kinase is essential for canonical Wnt signaling in Xenopus axis formation

Reiko Satow1, Miki Shitashige, Takafumi Jigami

  • 1Chemotherapy Division, National Cancer Center Research Institute, Chuo-ku, Tokyo 104-0045, Japan. resato@ncc.go.jp

The Journal of Biological Chemistry
|June 23, 2010
PubMed

Insights

Traf2- and Nck-interacting kinase (TNIK) activates Wnt signaling, crucial for development. In Xenopus, Xenopus TNIK (XTNIK) is essential for dorsal axis formation and Wnt target gene expression.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cancer Biology

Background:

  • Wnt signaling pathways are vital for embryonic development and adult homeostasis.
  • Aberrant Wnt signaling activation is linked to various cancers, including colorectal cancer.
  • Traf2- and Nck-interacting kinase (TNIK) was identified as a Wnt signaling activator in human colorectal cancer cells.

Purpose of the Study:

  • To investigate the role of TNIK in Wnt signaling during Xenopus development.
  • To determine if TNIK is essential for embryonic axis formation and Wnt target gene regulation.

Main Methods:

  • Maternal expression analysis of Xenopus TNIK (XTNIK).
  • Functional knockdown of XTNIK using a catalytically inactive mutant (K54R) and antisense morpholino oligonucleotides.
  • Assessment of Wnt signaling activity via beta-catenin-induced axis duplication and target gene expression analysis.

Main Results:

  • XTNIK is maternally expressed in Xenopus embryos.
  • Knockdown of XTNIK caused severe developmental malformations, including loss of head and axis structures.
  • XTNIK enhances beta-catenin-TCF transcriptional activity and is recruited to target gene promoters in a beta-catenin-dependent manner.

Conclusions:

  • XTNIK is essential for Wnt signaling transcriptional activity in Xenopus.
  • XTNIK plays a critical role in dorsal axis determination during Xenopus embryonic development.

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