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Related Experiment Videos

Changes in retinoic acid signaling alter otic patterning.

Stefan Hans1, Monte Westerfield

  • 1Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA.

Development (Cambridge, England)
|May 25, 2007
PubMed
Summary
This summary is machine-generated.

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Retinoic acid (RA) signaling in zebrafish controls otic vesicle size by regulating gene expression. Excess RA expands otic competence, while RA deficiency impairs Fgf3 and Wnt8b expression, compromising otic development.

Area of Science:

  • Developmental biology
  • Molecular genetics
  • Zebrafish embryogenesis

Background:

  • Retinoic acid (RA) plays crucial roles in embryonic development.
  • RA signaling levels influence otic vesicle size in zebrafish embryos.
  • Previous studies indicate RA's involvement in otic development, but underlying mechanisms are unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which retinoic acid signaling regulates otic vesicle formation and size in zebrafish.
  • To identify key genes and signaling pathways involved in RA-dependent otic development.
  • To differentiate the roles of RA in otic competence, induction, and maintenance.

Main Methods:

  • Zebrafish model system for studying embryonic development.
  • Genetic manipulation (mutants, overexpression) to alter RA signaling and gene expression.

Related Experiment Videos

  • Whole-mount in situ hybridization to analyze gene expression patterns (foxi1, pax8, fgf3, fgf8, wnt8b).
  • Morpholino-mediated gene knockdown to assess gene function.

    • Main Results:

    • Excess RA leads to ectopic foxi1 and pax8 expression, expanding otic competence.
    • Loss of RA signaling delays fgf3 expression and impairs otic induction, with Fgf8 being critical for induction.
    • RA deficiency compromises otic fate maintenance through reduced fgf3 and wnt8b expression from the hindbrain.

    Conclusions:

    • Retinoic acid signaling differentially regulates otic development: excess RA expands competence, while deficiency impairs induction and maintenance.
    • Fgf8 is essential for otic induction in RA-depleted embryos.
    • Fgf3 and Wnt8b are crucial for otic fate maintenance, with their expression dependent on RA signaling and hindbrain input.