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Updated: Jul 27, 2026
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Zebrafish Whole Mount High-Resolution Double Fluorescent In Situ Hybridization
Published on: March 25, 2009
The zebrafish neckless mutation reveals a requirement for raldh2 in mesodermal signals that pattern the hindbrain
G Begemann1, T F Schilling, G J Rauch
1MRC Intercellular Signalling Group, Centre for Developmental Genetics, University of Sheffield School of Medicine and Biomedical Science, Western Bank, UK.
Development (Cambridge, England)
|November 2, 2001
Summary
A new zebrafish mutation, neckless, inactivates retinaldehyde dehydrogenase type 2, crucial for retinoic acid synthesis. This impacts embryonic development, but some defects are reversible with retinoic acid treatment.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Neuroscience
Background:
- Retinoic acid is vital for embryonic development.
- Retinaldehyde dehydrogenase type 2 (RALDH2) synthesizes retinoic acid.
- The role of RALDH2 in vertebrate posterior cranial mesoderm patterning is not fully understood.
Purpose of the Study:
- To characterize the neckless zebrafish mutation.
- To investigate the function of RALDH2 in embryonic development.
- To elucidate the role of retinoic acid signaling in mesoderm-neural tube interactions.
Main Methods:
- Zebrafish mutagenesis and characterization.
- Gene expression analysis (retinoic acid receptor a, hoxb4).
- Mosaic analysis.
- Exogenous retinoic acid rescue experiments.
Main Results:
- The neckless mutation inactivates RALDH2.
- neckless embryos exhibit anteroposterior axis truncation and developmental defects.
- Reduced expression of retinoic acid receptor a and hoxb4 in neckless mutants.
- Defects can be partially rescued by exogenous retinoic acid.
- hoxb4 downregulation is a non-cell autonomous effect dependent on paraxial mesoderm signaling.
Conclusions:
- RALDH2 plays a conserved role in patterning posterior cranial mesoderm.
- Endogenous retinoic acid mediates signaling between paraxial mesoderm and neural tube.
- This study provides evidence for non-cell autonomous retinoic acid signaling in embryonic development.
