title: Axial protocadherin (AXPC) regulates cell fate during notochordal morphogenesis.
abstract: The separation and specification of mesoderm into the notochord and somites involves members of the non-clustered δ-protocadherins. Axial (AXPC) and paraxial (PAPC) protocadherins are expressed in the early dorsal mesoderm and later become refined to the developing notochordal and somitic mesoderm, respectively. The role of PAPC in this process has been studied extensively, but the role of AXPC is poorly understood. Partial knockdown of AXPC causes a specific bent-axis phenotype, while more severe knockdown results in the loss of notochord formation. The inability of these embryos to develop a notochord is not due to a cell-sorting event via changes in cell adhesion during gastrulation, but rather this defect is manifested through the loss of axial mesoderm specification, but not general mesoderm induction. The results presented here show that AXPC functions in notochord morphogenesis by directing cell-fate decisions rather than cell-cell adhesion.
authors.affiliation: Department of Cell Biology, School of Medicine, University of Virginia Health System, Charlottesville, Virginia 22908, USA.
authors.forename: Michael D
authors.initials: MD
authors.lastname: Yoder
authors.forename: Barry M
authors.initials: BM
authors.lastname: Gumbiner
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D001483:Base Sequence; D015820:Cadherins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D002448:Cell Adhesion / Q000235:genetics; D002450:Cell Communication / Q000235:genetics; D002454:Cell Differentiation / Q000235:genetics*; D004625:Embryo, Nonmammalian; D054262:Gastrulation / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D055785:Gene Knockdown Techniques; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D009024:Morphogenesis / Q000235:genetics*; D009672:Notochord / Q000196:embryology* / Q000378:metabolism; D011498:Protein Precursors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D014981:Xenopus / Q000196:embryology* / Q000235:genetics; D029867:Xenopus Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*
chemical_list: D015820:Cadherins; D006023:Glycoproteins; D036341:Intercellular Signaling Peptides and Proteins; C455359:PCDH1 protein, Xenopus; D011498:Protein Precursors; D029867:Xenopus Proteins; D049452:Green Fluorescent Proteins; C054234:chordin