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A20 regulates canonical wnt-signaling through an interaction with RIPK4

Brooke N Nakamura1, Alison Glazier1, Michael G Kattah2

  • 1Department of Medicine, Division of Gastroenterology and Liver Diseases, University of Southern California Keck School of Medicine, Los Angeles, California, United States of America.

Plos One
|May 3, 2018
PubMed

Insights

Tumor suppressor A20 regulates the wnt-beta-catenin pathway by interacting with RIPK4. Loss of A20 dysregulates wnt signaling, impacting colonic tumor development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • A20 is a ubiquitin-editing enzyme regulating inflammation and cell death.
  • A20 mutations are linked to malignancies, suggesting a tumor suppressor role.
  • A novel function of A20 in suppressing colonic tumor development was recently identified.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which A20 regulates the wnt-beta-catenin signaling pathway.
  • To investigate the role of A20 in colonic tumor suppression.
  • To identify A20's interaction partners within the wnt signaling cascade.

Main Methods:

  • Generation of A20 knockout cell lines using genome-editing techniques.
  • RNA sequencing (RNAseq) to analyze wnt-dependent gene expression.
  • Co-immunoprecipitation and ubiquitination assays to study protein interactions and modifications.

Main Results:

  • Loss of A20 leads to dysregulated wnt-dependent gene expression.
  • A20 directly interacts with receptor interacting protein kinase 4 (RIPK4).
  • A20 modifies ubiquitin chains on RIPK4, indicating a mechanism of wnt signaling regulation.

Conclusions:

  • A20 regulates wnt-beta-catenin signaling through its interaction with RIPK4.
  • A20's ubiquitin-editing activity on RIPK4 is crucial for controlling wnt signaling.
  • These findings provide insights into A20's tumor suppressor function in the colon.

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