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Galpha12/13 regulate epiboly by inhibiting E-cadherin activity and modulating the actin cytoskeleton.

Epiboly spreads and thins the blastoderm over the yolk cell during zebrafish gastrulation, and involves coordinated movements of several cell layers. Although recent studies have begun to elucidate the processes that underlie these epibolic movements, the cellular and molecular mechanisms involved remain to be fully defined. Here, we show that gastrulae with altered Galpha(12/13) signaling display delayed epibolic movement of the deep cells, abnormal movement of dorsal forerunner cells, and dissociation of cells from the blastoderm, phenocopying e-cadherin mutants. Biochemical and genetic studies indicate that Galpha(12/13) regulate epiboly, in part by associating with the cytoplasmic terminus of E-cadherin, and thereby inhibiting E-cadherin activity and cell adhesion. Furthermore, we demonstrate that Galpha(12/13) modulate epibolic movements of the enveloping layer by regulating actin cytoskeleton organization through a RhoGEF/Rho-dependent pathway. These results provide the first in vivo evidence that Galpha(12/13) regulate epiboly through two distinct mechanisms: limiting E-cadherin activity and modulating the organization of the actin cytoskeleton.

Pubmed ID: 19307601


  • Lin F
  • Chen S
  • Sepich DS
  • Panizzi JR
  • Clendenon SG
  • Marrs JA
  • Hamm HE
  • Solnica-Krezel L


The Journal of cell biology

Publication Data

March 23, 2009

Associated Grants

  • Agency: NCRR NIH HHS, Id: 1K99 RR 024119-01
  • Agency: NCRR NIH HHS, Id: 1S10 RR 015682
  • Agency: NEI NIH HHS, Id: EY 07135-13
  • Agency: NEI NIH HHS, Id: EY 10291
  • Agency: NIGMS NIH HHS, Id: GM 77770
  • Agency: NHLBI NIH HHS, Id: HL 60678

Mesh Terms

  • Actins
  • Animals
  • Cadherins
  • Cell Adhesion
  • Cell Movement
  • Cytoskeleton
  • GTP-Binding Protein alpha Subunits, G12-G13
  • Gastrula
  • Gastrulation
  • Gene Expression Regulation, Developmental
  • Guanine Nucleotide Exchange Factors
  • Mutation
  • Protein Structure, Tertiary
  • Recombinant Fusion Proteins
  • Signal Transduction
  • Time Factors
  • Zebrafish
  • Zebrafish Proteins
  • rho GTP-Binding Proteins