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Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
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Pebble/ECT2 RhoGEF negatively regulates the Wingless/Wnt signaling pathway.

Elisabeth R Greer1, Anna T Chao, Amy Bejsovec

  • 1Department of Biology, Duke University, Durham, NC 27708-0338, USA.

Development (Cambridge, England)
|November 8, 2013
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Summary

A novel mechanism regulating Wingless/Wnt signaling involves the Rho guanine nucleotide exchange factor (GEF) pebble (pbl)/ECT2, which inhibits Wnt activity and impacts embryonic development and cancer. This discovery offers new insights into Wnt pathway regulation.

Keywords:
Pebble/ECT2RhoGEFWingless/Wnt signaling

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Biology

Background:

  • Wingless (Wg)/Wnt signaling is crucial for embryonic development and its dysregulation is linked to human cancers.
  • The precise mechanisms governing Wnt pathway regulation remain incompletely understood.
  • Rho guanine nucleotide exchange factors (GEFs) are primarily known for their roles in cytokinesis.

Purpose of the Study:

  • To identify novel regulators of the Wnt signaling pathway.
  • To investigate the conserved function of RhoGEFs beyond cytokinesis.
  • To elucidate the role of pebble (pbl)/ECT2 in Wnt pathway modulation.

Main Methods:

  • Utilized Drosophila melanogaster as a model organism to study gene function.
  • Employed loss-of-function and gain-of-function genetic approaches in Drosophila embryos.
  • Conducted cell-based assays in cultured Drosophila and human cells to assess gene expression.
  • Investigated the requirement of specific protein domains for Wnt pathway regulation.

Main Results:

  • Discovered that the RhoGEF pebble (pbl) in Drosophila and ECT2 in humans act as inhibitors of Wg/Wnt signaling.
  • Demonstrated that loss and gain of pbl function in Drosophila embryos lead to pattern defects indicative of altered Wg activity.
  • Showed that both Pbl and ECT2 repress Wnt target gene expression in cellular assays.
  • Identified that GEF activity, but not domains essential for cytokinesis, is required for Wnt regulation.
  • Found that Pbl/ECT2 functions downstream of Armadillo (Arm)/beta-catenin stabilization.

Conclusions:

  • Pbl/ECT2 represents a novel mechanism for regulating Wnt pathway activity through GTPase regulation at a previously unrecognized point in the signaling cascade.
  • This finding reveals a conserved, dual role for this RhoGEF in both cytokinesis and Wnt signal transduction.
  • The study provides new insights into the classification of ECT2 as a human proto-oncogene, linking its aberrant activity to cancer development.