PUBLICATION

Bmp and Fgf signaling are essential for liver specification in zebrafish

Authors
Shin, D., Shin, C.H., Tucker, J., Ober, E.A., Rentzsch, F., Poss, K.D., Hammerschmidt, M., Mullins, M.C., and Stainier, D.Y.
ID
ZDB-PUB-070523-16
Date
2007
Source
Development (Cambridge, England)   134(11): 2041-2050 (Journal)
Registered Authors
Hammerschmidt, Matthias, Mullins, Mary C., Ober, Elke, Poss, Kenneth D., Rentzsch, Fabian, Shin, Chong, Shin, Donghun, Stainier, Didier
Keywords
hhex, prox1, alk8 (acvr1), Competence, Endoderm, Hepatocyte, Zebrafish
MeSH Terms
  • Activin Receptors, Type I/metabolism
  • Animals
  • Bone Morphogenetic Protein Receptors/metabolism*
  • Cell Differentiation/physiology
  • DNA Primers/genetics
  • Endoderm/cytology
  • Endoderm/physiology
  • GATA Transcription Factors/metabolism
  • Gene Expression Profiling
  • Homeodomain Proteins/metabolism
  • Hot Temperature
  • In Situ Hybridization
  • Liver/embryology*
  • Liver/metabolism
  • Morphogenesis/physiology*
  • Receptors, Fibroblast Growth Factor/metabolism*
  • Repressor Proteins/metabolism
  • Signal Transduction/genetics
  • Signal Transduction/physiology*
  • Tumor Suppressor Proteins/metabolism
  • Zebrafish/embryology*
  • Zebrafish/genetics
  • Zebrafish Proteins/metabolism
PubMed
17507405 Full text @ Development
Abstract
Based on data from in vitro tissue explant and ex vivo cell/bead implantation experiments, Bmp and Fgf signaling have been proposed to regulate hepatic specification. However, genetic evidence for this hypothesis has been lacking. Here, we provide in vivo genetic evidence that Bmp and Fgf signaling are essential for hepatic specification. We utilized transgenic zebrafish that overexpress dominant-negative forms of Bmp or Fgf receptors following heat-shock induction. These transgenes allow one to bypass the early embryonic requirements for Bmp and Fgf signaling, and also to completely block Bmp or Fgf signaling. We found that the expression of hhex and prox1, the earliest liver markers in zebrafish, was severely reduced in the liver region when Bmp or Fgf signaling was blocked just before hepatic specification. However, hhex and prox1 expression in adjacent endodermal and mesodermal tissues appeared unaffected by these manipulations. Additional genetic studies indicate that the endoderm maintains competence for Bmp-mediated hepatogenesis over an extended window of embryonic development. Altogether, these data provide the first genetic evidence that Bmp and Fgf signaling are essential for hepatic specification, and suggest that endodermal cells remain competent to differentiate into hepatocytes for longer than anticipated.
Genes / Markers
Figures
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Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes