Adherens junctions and beta-catenin-mediated cell signalling in a non-metazoan organism

M J Grimson, J C Coates, J P Reynolds, M Shipman, R L Blanton, A J Harwood

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)


Mechanical forces between cells have a principal role in the organization of animal tissues. Adherens junctions are an important component of these tissues, connecting cells through their actin cytoskeleton and allowing the assembly of tensile structures. At least one adherens junction protein, beta-catenin, also acts as a signalling molecule, directly regulating gene expression. To date, adherens junctions have only been detected in metazoa, and therefore we looked for them outside the animal kingdom to examine their evolutionary origins. The non-metazoan Dictyostelium discoideum forms a multicellular, differentiated structure. Here we describe the discovery of actin-associated intercellular junctions in Dictyostelium. We have isolated a gene encoding a beta-catenin homologue, aardvark, which is a component of the junctional complex, and, independently, is required for cell signalling. Our discovery of adherens junctions outside the animal kingdom shows that the dual role of beta-catenin in cell-cell adhesion and cell signalling evolved before the origins of metazoa.

Original languageEnglish
Pages (from-to)727-731
Number of pages5
Issue number6813
Publication statusPublished - 7 Dec 2000


  • Actins
  • Adherens Junctions
  • Amino Acid Sequence
  • Animals
  • Biological Evolution
  • Calcium-Calmodulin-Dependent Protein Kinases
  • Cell Differentiation
  • Cytoskeletal Proteins
  • Dictyostelium
  • Genes, Protozoan
  • Glycogen Synthase Kinase 3
  • Molecular Sequence Data
  • Mutagenesis
  • Phosphorylation
  • Recombinant Fusion Proteins
  • Signal Transduction
  • Trans-Activators
  • beta Catenin


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