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Klf5a in Endoderm Promotes Pharyngeal Cartilage Morphogenesis
Wanqiu Li1, Zeyao Zhu2,3, Ou Sha1
1School of Basic Medical Sciences, Shenzhen University Medical School, Shenzhen 518055, China.
International Journal of Molecular Sciences
|November 27, 2025
Summary
The transcription factor klf5a is crucial for pharyngeal cartilage development in zebrafish. It regulates neural crest cell proliferation and differentiation by signaling through the pharyngeal endoderm.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Pharyngeal cartilage development is essential for craniofacial structures.
- Neural crest cells (NCCs) form pharyngeal cartilage, guided by endodermal signals.
- Molecular mechanisms linking endodermal signals to NCCs are not fully understood.
Purpose of the Study:
- Investigate the role of klf5a in zebrafish pharyngeal cartilage development.
- Elucidate the molecular pathways regulated by klf5a in response to endodermal signals.
Main Methods:
- Utilized morpholino-mediated knockdown of klf5a in zebrafish embryos.
- Assessed NCC specification, migration, proliferation, and differentiation.
- Analyzed gene expression of downstream targets like fgfbp2b.
- Performed rescue experiments with klf5a and fgfbp2b mRNA injections.
Main Results:
- klf5a knockdown impaired NCC proliferation and differentiation in the pharyngeal region.
- klf5a deficiency reduced endodermal fgfbp2b expression, a modulator of FGF signaling.
- Overexpression of klf5a rescued cartilage defects, while fgfbp2b alone did not.
Conclusions:
- klf5a is essential for regulating endodermal signals that direct NCC-derived pharyngeal cartilage formation.
- klf5a likely acts through multiple downstream targets, including fgfbp2b.
- This study offers insights into craniofacial development and potential therapeutic targets for related disorders.
Keywords:
cell differentiationcell signalingcraniofacial anomaliescraniofacial biologydevelopmental biologyzebrafishMore Related Videos
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