PP2A:B56epsilon is required for Wnt/beta-catenin signaling during embryonic development
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Updated: Aug 30, 2026

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
Published on: June 17, 2014
Jing Yang1, Jinling Wu, Change Tan
1Department of Medicine (Hematology-Oncology) Institute, University of Pennsylvania School of Medicine, 364 Clinical Research Building, 415 Curie Blvd, Philadelphia, PA 19104, USA.
Abstract:
The Wnt/beta-catenin pathway plays important roles during embryonic development and growth control. The B56 regulatory subunit of protein phosphatase 2A (PP2A) has been implicated as a regulator of this pathway. However, this has not been investigated by loss-of-function analyses. Here we report loss-of-function analysis of PP2A:B56epsilon during early Xenopus embryogenesis. We provide direct evidence that PP2A:B56epsilon is required for Wnt/beta-catenin signaling upstream of Dishevelled and downstream of the Wnt ligand. We show that maternal PP2A:B56epsilon function is required for dorsal development, and PP2A:B56epsilon function is required later for the expression of the Wnt target gene engrailed, for subsequent midbrain-hindbrain boundary formation, and for closure of the neural tube. These data demonstrate a positive role for PP2A:B56epsilon in the Wnt pathway.
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