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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
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Fgf3 and Fgf16 expression patterns define spatial and temporal domains in the developing chick inner ear.

Daniel Olaya-Sánchez1, Luis Óscar Sánchez-Guardado1, Sho Ohta2

  • 1Department of Cell Biology, School of Science, University of Extremadura, Avda. de Elvas s/n, 06071, Badajoz, Spain.

Brain Structure & Function
|March 21, 2016
PubMed
Summary

Fibroblast growth factors (FGF3) and (FGF16) are crucial for inner ear development. Their distinct expression patterns guide the formation and specification of auditory and vestibular sensory structures in the developing ear.

Keywords:
Acoustic-vestibular ganglionFibroblastic growth factorsOtic innervationOtic specificationSensory patches

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Area of Science:

  • Developmental Biology
  • Otolaryngology
  • Genetics

Background:

  • The inner ear, responsible for hearing and balance, develops from the otic epithelium.
  • Precise patterning and cell specification are orchestrated by signaling pathways and gene expression.
  • Fibroblast Growth Factor 3 (FGF3) and FGF16 are implicated as key regulators in these developmental processes.

Purpose of the Study:

  • To investigate the expression patterns and potential roles of FGF3 and FGF16 during chick inner ear development.
  • To elucidate how these fibroblast growth factors contribute to the formation of specific auditory and vestibular sensory organs.

Main Methods:

  • In situ hybridization was used to visualize Fgf3 and Fgf16 gene expression in developing chick inner ear structures.
  • Expression patterns were analyzed across different developmental stages and within distinct sensory epithelia.

Main Results:

  • Fgf3 expression was observed at the borders of developing cristae and in the utricular and saccular maculae.
  • Fgf16 showed dynamic expression, with strong signals in specific vestibular pouches and delimiting certain sensory patches.
  • Differential expression of Fgf3 and Fgf16 suggests distinct roles in the specification of anterior versus posterior vestibular maculae and cochlear development.

Conclusions:

  • FGF3 and FGF16 signaling pathways are essential for establishing the inner ear's complex architecture.
  • These fibroblast growth factors play critical roles in defining epithelial identities and regulating neurogenesis within the developing otic system.
  • The findings highlight FGF3 and FGF16 as key players in the genetic control of inner ear development.