ZFIN ID: ZDB-PUB-961014-438
Exogenous retinoic acid causes specific alterations in the development of the midbrain and hindbrain of the zebrafish embryo including positional respecification of the Mauthner neuron
Hill, J., Clarke, J.D.W., Vargesson, N., Jowett, T., and Holder, N.
Date: 1995
Source: Mechanisms of Development   50: 3-16 (Journal)
Registered Authors: Clarke, Jon, Hill, James, Holder, Nigel, Jowett, Trevor
Keywords: none
MeSH Terms:
  • Animals
  • Embryo, Nonmammalian/drug effects
  • Gene Expression Regulation, Developmental/drug effects
  • Genes, Regulator
  • Mesencephalon/drug effects*
  • Mesencephalon/embryology
  • Neurons/drug effects*
  • Phenotype
  • Prosencephalon/drug effects
  • Reticular Formation/cytology
  • Reticular Formation/drug effects*
  • Rhombencephalon/drug effects*
  • Rhombencephalon/metabolism
  • Spinal Cord/cytology
  • Spinal Cord/drug effects*
  • Tretinoin/toxicity*
  • Zebrafish
PubMed: 7605750 Full text @ Mech. Dev.
ABSTRACT
Exogenously applied retinoic acid given at the early stages of gastrulation causes abnormal development of the caudal midbrain and anterior hindbrain in vertebrate embryos. We describe the limits of the brain regions that are affected using neuroanatomical criteria in the zebrafish embryo. Analysis of the reticulospinal complex shows that the Mauthner cell, which normally differentiates in rhombomere 4, is duplicated either in this rhombomere or in rhombomere 2. Using probes for zebrafish krx20 and pax2, it is demonstrated that retinoic acid affects the expression domains of these regulatory genes in a manner that is consistent with the neuroanatomical data. Expression of the goosecoid gene, which expressed in the prospective anterior mesoderm from the onset of gastrulation, is unaffected by the doses of retinoic acid used in this study, reflecting the normal development of the anterior end of the embryo.
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