PUBLICATION

Second-order projection from the posterior lateral line in the early zebrafish brain

Authors
Fame, R.M., Brajon, C., and Ghysen, A.
ID
ZDB-PUB-061227-23
Date
2006
Source
Neural Development   1: 4 (Journal)
Registered Authors
Ghysen, Alain
Keywords
none
MeSH Terms
  • Afferent Pathways/anatomy & histology
  • Afferent Pathways/embryology*
  • Afferent Pathways/growth & development*
  • Amino Acids/metabolism
  • Animals
  • Animals, Genetically Modified
  • Brain/anatomy & histology
  • Brain/embryology
  • Brain/growth & development
  • Brain/metabolism
  • Embryo, Nonmammalian
  • Functional Laterality
  • Green Fluorescent Proteins/genetics
  • Green Fluorescent Proteins/metabolism
  • Larva
  • Lateral Line System*/cytology
  • Lateral Line System*/embryology
  • Lateral Line System*/growth & development
  • Neurons, Afferent/physiology*
  • Zebrafish
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism
PubMed
17147780 Full text @ Neural Dev.
Abstract
BACKGROUND: Mechanosensory information gathered by hair cells of the fish lateral-line system is collected by sensory neurons and sent to the ipsilateral hindbrain. The information is then conveyed to other brain structures through a second-order projection. In the adult, part of the second-order projection extends to the contralateral hindbrain, while another part connects to a midbrain structure, the torus semicircularis. RESULTS: In this paper we examine the second-order projection from the posterior lateral-line system in late embryonic/early larval zebrafish. At four days after fertilization the synaptic field of the sensory neurons can be accurately targeted, allowing a very reproducible labeling of second-order neurons. We show that second-order projections are highly stereotyped, that they vary according to rhombomeric identity, and that they are almost completely lateralized. We also show that the projections extend not only to the contralateral hindbrain and torus semicircularis but to many other brain centers as well, including gaze- and posture-controlling nuclei in the midbrain, and presumptive thalamic nuclei. CONCLUSION: We propose that the extensive connectivity observed in early brain development reveals a basic scaffold common to most vertebrates, from which different subsets are later reinforced in various vertebrate groups. The large repertoire of projection targets provides a promising system to study the genetic encoding of this differential projection capacity.
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