PUBLICATION
Direct action of the Nodal-related signal Cyclops in induction of sonic hedgehog in the ventral midline of the CNS
- Authors
- Müller, F., Albert, S., Blader, P., Fischer, N., Hallonet, M., and Strähle, U.
- ID
- ZDB-PUB-000824-35
- Date
- 2000
- Source
- Development (Cambridge, England) 127(18): 3889-3897 (Journal)
- Registered Authors
- Blader, Patrick, Fischer, Nadine, Müller, Ferenc, Strähle, Uwe
- Keywords
- none
- MeSH Terms
-
- Transforming Growth Factor beta*/genetics
- Transforming Growth Factor beta*/metabolism*
- Proteins/genetics*
- Proteins/metabolism
- Neural Tube Defects/genetics
- Neural Tube Defects/metabolism
- In Situ Hybridization
- Hedgehog Proteins
- Forkhead Transcription Factors
- Intracellular Signaling Peptides and Proteins
- Zebrafish/embryology*
- Zebrafish/genetics
- Models, Biological
- Mutation/genetics
- Transcription Factors/metabolism
- Promoter Regions, Genetic
- Zebrafish Proteins*
- Trans-Activators/antagonists & inhibitors
- Trans-Activators/metabolism
- Biomarkers
- Immunohistochemistry
- DNA-Binding Proteins/antagonists & inhibitors
- DNA-Binding Proteins/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Central Nervous System/embryology*
- Central Nervous System/metabolism
- Cyclic AMP-Dependent Protein Kinases/metabolism
- Gene Expression Regulation, Developmental*
- Enhancer Elements, Genetic/genetics
- Embryo, Nonmammalian/metabolism
- Animals
- Chick Embryo
- Genes, Reporter
- Smad2 Protein
- Nodal Protein
- Signal Transduction
- PubMed
- 10952887 Full text @ Development
Citation
Müller, F., Albert, S., Blader, P., Fischer, N., Hallonet, M., and Strähle, U. (2000) Direct action of the Nodal-related signal Cyclops in induction of sonic hedgehog in the ventral midline of the CNS. Development (Cambridge, England). 127(18):3889-3897.
Abstract
The secreted molecule Sonic hedgehog (Shh) is crucial for floor plate and ventral brain development in amniote embryos. In zebrafish, mutations in cyclops (cyc), a gene that encodes a distinct signal related to the TGF(β) family member Nodal, result in neural tube defects similar to those of shh null mice. cyc mutant embryos display cyclopia and lack floor plate and ventral brain regions, suggesting a role for Cyc in specification of these structures. cyc mutants express shh in the notochord but lack expression of shh in the ventral brain. Here we show that Cyc signalling can act directly on shh expression in neural tissue. Modulation of the Cyc signalling pathway by constitutive activation or inhibition of Smad2 leads to altered shh expression in zebrafish embryos. Ectopic activation of the shh promoter occurs in response to expression of Cyc signal transducers in the chick neural tube. Furthermore an enhancer of the shh gene, which controls ventral neural tube expression, is responsive to Cyc signal transducers. Our data imply that the Nodal related signal Cyc induces shh expression in the ventral neural tube. Based on the differential responsiveness of shh and other neural tube specific genes to Hedgehog and Cyc signalling, a two-step model for the establishment of the ventral midline of the CNS is proposed.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping