PUBLICATION

Zebrafish Dkk1, induced by the pre-MBT Wnt signaling, is secreted from the prechordal plate and patterns the anterior neural plate

Authors
Shinya, M., Eschbach, C., Clark, M., Lehrach, H., and Furutani-Seiki, M.
ID
ZDB-PUB-001101-4
Date
2000
Source
Mechanisms of Development   98(1-2): 3-17 (Journal)
Registered Authors
Clark, Matthew D., Furutani-Seiki, Makoto, Lehrach, Hans, Shinya, Minori
Keywords
Wnt signaling; Dkk-1; A-P patterning; anterior neural plate; prechordal plate; forebrain; zebrafish
MeSH Terms
  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Blastocyst/metabolism
  • Body Patterning/genetics
  • Body Patterning/physiology
  • Brain/embryology
  • DNA/genetics
  • Gene Expression Regulation, Developmental
  • Genes, Homeobox
  • In Situ Hybridization
  • Intercellular Signaling Peptides and Proteins
  • Models, Biological
  • Molecular Sequence Data
  • Nervous System/embryology
  • Proteins/genetics*
  • Proteins/physiology*
  • Proto-Oncogene Proteins/metabolism
  • RNA, Messenger/genetics
  • RNA, Messenger/metabolism
  • Sequence Homology, Amino Acid
  • Sequence Homology, Nucleic Acid
  • Signal Transduction
  • Wnt Proteins
  • Zebrafish/embryology*
  • Zebrafish/genetics*
  • Zebrafish/metabolism
  • Zebrafish Proteins*
PubMed
11044603 Full text @ Mech. Dev.
Abstract
mRNA injection into the ventral blastomeres of Xenopus embryos of mRNA encoding Wnt pathway genes induces a secondary axis with complete head structures. To identify target genes of the pre-MBT dorsalization pathway that might be responsible for head formation in zebrafish, we have cloned zebrafish dickkopf1 (dkk1), which is expressed in tissues implicated in head patterning. We found that dkk1 blocks the post-MBT Wnt signaling and dkk1 is a target of the pre-MBT Wnt signaling. Dkk1 overexpression in the prechordal plate suggests that Dkk1, secreted from the prechordal plate, expands the forebrain at the expense of the midbrain in the anterior neural plate. Furthermore, dkk1 acts in parallel to the homeobox gene bozozok and bozozok is required for the maintenance of dkk1 expression. The nodal gene squint is also required for the maintenance of dkk1 expression. Among the mutually dependent target genes of the pre-MBT Wnt signaling, dkk1 plays an important role in patterning the anterior head of zebrafish.
Genes / Markers
Figures
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Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping