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Specification of epibranchial placodes in zebrafish.

Publication ,  Journal Article
Nechiporuk, A; Linbo, T; Poss, KD; Raible, DW
Published in: Development
February 2007

In all vertebrates, the neurogenic placodes are transient ectodermal thickenings that give rise to sensory neurons of the cranial ganglia. Epibranchial (EB) placodes generate neurons of the distal facial, glossopharyngeal and vagal ganglia, which convey sensation from the viscera, including pharyngeal endoderm structures, to the CNS. Recent studies have implicated signals from pharyngeal endoderm in the initiation of neurogenesis from EB placodes; however, the signals underlying the formation of placodes are unknown. Here, we show that zebrafish embryos mutant for fgf3 and fgf8 do not express early EB placode markers, including foxi1 and pax2a. Mosaic analysis demonstrates that placodal cells must directly receive Fgf signals during a specific crucial period of development. Transplantation experiments and mutant analysis reveal that cephalic mesoderm is the source of Fgf signals. Finally, both Fgf3 and Fgf8 are sufficient to induce foxi1-positive placodal precursors in wild-type as well as Fgf3-plus Fgf8-depleted embryos. We propose a model in which mesoderm-derived Fgf3 and Fgf8 signals establish both the EB placodes and the development of the pharyngeal endoderm, the subsequent interaction of which promotes neurogenesis. The coordinated interplay between craniofacial tissues would thus assure proper spatial and temporal interactions in the shaping of the vertebrate head.

Duke Scholars

Published In

Development

DOI

ISSN

0950-1991

Publication Date

February 2007

Volume

134

Issue

3

Start / End Page

611 / 623

Location

England

Related Subject Headings

  • Zebrafish Proteins
  • Zebrafish
  • Signal Transduction
  • PAX2 Transcription Factor
  • Oligodeoxyribonucleotides, Antisense
  • Mutation
  • Models, Neurological
  • Gene Expression Regulation, Developmental
  • Forkhead Transcription Factors
  • Fibroblast Growth Factors
 

Citation

APA
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ICMJE
MLA
NLM
Nechiporuk, A., Linbo, T., Poss, K. D., & Raible, D. W. (2007). Specification of epibranchial placodes in zebrafish. Development, 134(3), 611–623. https://doi.org/10.1242/dev.02749
Nechiporuk, Alexei, Tor Linbo, Kenneth D. Poss, and David W. Raible. “Specification of epibranchial placodes in zebrafish.Development 134, no. 3 (February 2007): 611–23. https://doi.org/10.1242/dev.02749.
Nechiporuk A, Linbo T, Poss KD, Raible DW. Specification of epibranchial placodes in zebrafish. Development. 2007 Feb;134(3):611–23.
Nechiporuk, Alexei, et al. “Specification of epibranchial placodes in zebrafish.Development, vol. 134, no. 3, Feb. 2007, pp. 611–23. Pubmed, doi:10.1242/dev.02749.
Nechiporuk A, Linbo T, Poss KD, Raible DW. Specification of epibranchial placodes in zebrafish. Development. 2007 Feb;134(3):611–623.
Journal cover image

Published In

Development

DOI

ISSN

0950-1991

Publication Date

February 2007

Volume

134

Issue

3

Start / End Page

611 / 623

Location

England

Related Subject Headings

  • Zebrafish Proteins
  • Zebrafish
  • Signal Transduction
  • PAX2 Transcription Factor
  • Oligodeoxyribonucleotides, Antisense
  • Mutation
  • Models, Neurological
  • Gene Expression Regulation, Developmental
  • Forkhead Transcription Factors
  • Fibroblast Growth Factors