PUBLICATION

Twisted gastrulation promotes BMP signaling in zebrafish dorsal-ventral axial patterning

Authors
Little, S.C., and Mullins, M.C.
ID
ZDB-PUB-041108-1
Date
2004
Source
Development (Cambridge, England)   131(23): 5825-5835 (Journal)
Registered Authors
Little, Shawn, Mullins, Mary C.
Keywords
Twisted gastrulation, BMP signaling, Bone morphogenetic protein, Chordin, Zebrafish
MeSH Terms
  • Animals
  • Blotting, Western
  • Bone Morphogenetic Proteins/metabolism*
  • Cell Lineage
  • Drosophila Proteins/genetics
  • Gastrula/metabolism*
  • Genotype
  • Glycoproteins/metabolism
  • Heterozygote
  • In Situ Hybridization
  • Intercellular Signaling Peptides and Proteins/metabolism
  • Phenotype
  • RNA/metabolism
  • RNA, Messenger/metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Signal Transduction*
  • Time Factors
  • Transgenes
  • Zebrafish
  • Zebrafish Proteins/genetics*
  • Zebrafish Proteins/physiology*
PubMed
15525664 Full text @ Development
Abstract
In vertebrates and invertebrates, the bone morphogenetic protein (BMP) signaling pathway patterns cell fates along the dorsoventral (DV) axis. In vertebrates, BMP signaling specifies ventral cell fates, whereas restriction of BMP signaling by extracellular antagonists allows specification of dorsal fates. In misexpression assays, the conserved extracellular factor Twisted gastrulation (Tsg) is reported to both promote and antagonize BMP signaling in DV patterning. To investigate the role of endogenous Tsg in early DV patterning, we performed morpholino (MO)-based knockdown studies of Tsg1 in zebrafish. We found that loss of tsg1 results in a moderately strong dorsalization of the embryonic axis, suggesting that Tsg1 promotes ventral fates. Knockdown of tsg1 combined with loss of function of the BMP agonist tolloid (mini fin) or heterozygosity for the ligand bmp2b (swirl) enhanced dorsalization, supporting a role for Tsg1 in specifying ventral cell fates as a BMP signaling agonist. Moreover, loss of tsg1 partially suppressed the ventralized phenotypes of mutants of the BMP antagonists Chordin or Sizzled (Ogon). Our results support a model in which zebrafish Tsg1 promotes BMP signaling, and thus ventral cell fates, during DV axial patterning.
Genes / Markers
Figures
Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes