title: PP2A:B56epsilon is required for Wnt/beta-catenin signaling during embryonic development.
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.
authors.affiliation: Department of Medicine (Hematology-Oncology) Institute, University of Pennsylvania School of Medicine, 364 Clinical Research Building, 415 Curie Blvd, Philadelphia, PA 19104, USA.
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.forename: Jinling
authors.initials: J
authors.lastname: Wu
authors.forename: Change
authors.initials: C
authors.lastname: Tan
authors.forename: Peter S
authors.initials: PS
authors.lastname: Klein
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D001921:Brain / Q000033:anatomy & histology / Q000196:embryology; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D000072261:Dishevelled Proteins; D004625:Embryo, Nonmammalian / Q000033:anatomy & histology / Q000502:physiology*; D017403:In Situ Hybridization; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D009024:Morphogenesis; D016376:Oligonucleotides, Antisense / Q000378:metabolism; D009865:Oocytes / Q000166:cytology / Q000502:physiology; D010749:Phosphoprotein Phosphatases / Q000235:genetics / Q000378:metabolism*; D010750:Phosphoproteins / Q000378:metabolism; D054648:Protein Phosphatase 2; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D015534:Trans-Activators / Q000378:metabolism*; D051153:Wnt Proteins; D029867:Xenopus Proteins; D014982:Xenopus laevis; D029961:Zebrafish Proteins; D051176:beta Catenin
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C495266:CTNNB1 protein, Xenopus; D003598:Cytoskeletal Proteins; D000072261:Dishevelled Proteins; D007527:Isoenzymes; D016376:Oligonucleotides, Antisense; D010750:Phosphoproteins; D011518:Proto-Oncogene Proteins; D015534:Trans-Activators; D051153:Wnt Proteins; D029867:Xenopus Proteins; D029961:Zebrafish Proteins; D051176:beta Catenin; D010749:Phosphoprotein Phosphatases; D054648:Protein Phosphatase 2