PUBLICATION

Growth cones utilize both widespread and local directional cues in the zebrafish brain

Authors
Kanki, J.P. and Kuwada, J.Y.
ID
ZDB-PUB-000309-32
Date
2000
Source
Developmental Biology   219(2): 364-372 (Journal)
Registered Authors
Kanki, John, Kuwada, John
Keywords
zebrafish; growth cone; epiphysis; brain; netrin; semaphorin
MeSH Terms
  • Animals
  • Axons/ultrastructure
  • Brain/embryology*
  • Brain/ultrastructure
  • Gene Expression Regulation, Developmental
  • Growth Cones/ultrastructure*
  • Homeodomain Proteins/genetics
  • In Situ Hybridization
  • Intracellular Signaling Peptides and Proteins
  • LIM-Homeodomain Proteins
  • Mutation
  • Nerve Tissue Proteins/genetics
  • Neural Pathways/embryology
  • Neurons/transplantation
  • Transcription Factors
  • Transforming Growth Factor beta/genetics
  • Zebrafish/embryology*
  • Zebrafish/genetics
  • Zebrafish Proteins
PubMed
10694428 Full text @ Dev. Biol.
Abstract
The distribution of cues that provide directional information for specific growth cones in the zebrafish brain was functionally assayed by transplanting epiphysial neurons to ectopic locations in the embryonic brain followed by determining the pathways taken by the donor axons. Epiphysial axons normally first extend ventrally from their position in the dorsal diencephalon and then turn and extend anteriorly in the ventral diencephalon. When transplanted to ectopic sites at other axial levels of the brain, where in principle the axons could extend in any direction, epiphysial axons consistently extended ventrally. Furthermore, following initial ventral extension ectopic epiphysial axons turned randomly in the anterior and posterior directions. These results suggest that the cues for ventral extension are widely distributed along the rostrocaudal axis of the zebrafish brain, but the cues for subsequent anterior extension are restricted to the site where the epiphysial axons normally turn longitudinally.
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