PUBLICATION

Pax8 and Pax2a function synergistically in otic specification, downstream of the Foxi1 and Dlx3b transcription factors

Authors
Hans, S., Liu, D., and Westerfield, M.
ID
ZDB-PUB-041006-7
Date
2004
Source
Development (Cambridge, England)   131(20): 5091-5102 (Journal)
Registered Authors
Hans, Stefan, Liu, Dong, Westerfield, Monte
Keywords
dlx3b, fgf3, fgf8, foxi1, Inner ear, Morpholino, Otic placode, pax8, pax2a, sox9a, sox9b, Zebrafish
MeSH Terms
  • Animals
  • DNA-Binding Proteins/metabolism*
  • Ear/embryology*
  • Fibroblast Growth Factor 3
  • Fibroblast Growth Factor 8
  • Fibroblast Growth Factors/metabolism
  • Forkhead Transcription Factors
  • High Mobility Group Proteins/metabolism
  • Homeodomain Proteins/metabolism*
  • Nuclear Proteins/metabolism*
  • PAX2 Transcription Factor
  • Paired Box Transcription Factors
  • SOX9 Transcription Factor
  • Trans-Activators/metabolism*
  • Transcription Factors/metabolism*
  • Zebrafish/embryology*
  • Zebrafish/metabolism
  • Zebrafish Proteins/metabolism*
PubMed
15459102 Full text @ Development
Abstract
The vertebrate inner ear arises from an ectodermal thickening, the otic placode, that forms adjacent to the presumptive hindbrain. Previous studies have suggested that competent ectodermal cells respond to Fgf signals from adjacent tissues and express two highly related paired box transcription factors Pax2a and Pax8 in the developing placode. We show that compromising the functions of both Pax2a and Pax8 together blocks zebrafish ear development, leaving only a few residual otic cells. This suggests that Pax2a and Pax8 are the main effectors downstream of Fgf signals. Our results further provide evidence that pax8 expression and pax2a expression are regulated by two independent factors, Foxi1 and Dlx3b, respectively. Combined loss of both factors eliminates all indications of otic specification. We suggest that the Foxi1-Pax8 pathway provides an early 'jumpstart' of otic specification that is maintained by the Dlx3b-Pax2a pathway.
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