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Updated: Jan 31, 2026
09:54
Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
Published on: May 10, 2019
12.6K
Fgf20 is required for sensory epithelial specification in the developing cochlea.
Toshinori Hayashi1, Catherine A Ray, Olivia Bermingham-McDonogh
1Virginia Merrill Bloedel Hearing Research Center and Department of Biological Structure, University of Washington, Seattle, Washington 98195, USA.
Summary
Fibroblast Growth Factor (FGF) signaling is crucial for inner ear development. Inhibiting FGF signaling between embryonic days 14-16 severely impacts hair and support cell formation, identifying FGF20 as a key ligand.
Area of Science:
- Developmental Biology
- Otolaryngology
- Cell Signaling
Background:
- Fibroblast Growth Factor Receptor 1 (FGFR1) deletion causes severe cochlear development defects.
- The precise timing of FGF signaling requirement during early cochlear development remains unknown.
Purpose of the Study:
- To investigate the critical period for FGF signaling in early cochlear development.
- To identify the specific FGF ligand involved in sensory cell specification.
Main Methods:
- Utilized an FGF receptor inhibitor to block FGF signaling from embryonic day 14 (E14) to E16.
- Analyzed gene expression changes (Pea3, Erm, Math1) and cell death/proliferation rates.
- Employed a specific antibody to block FGF20 function.
Main Results:
- FGF signaling inhibition during E14-E16 dramatically reduced hair and support cell development.
- The observed defects were not due to increased cell death or altered proliferation.
- FGF20 was identified as the likely ligand, as blocking it mimicked the effects of FGF receptor inhibition.
Conclusions:
- Defined the specific developmental window (E14-E16) for FGF-dependent sensory cell specification in the cochlea.
- Identified FGF20 as the crucial ligand mediating this process via FGFR1.
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