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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Related Experiment Video

Updated: Jan 26, 2026

A Protocol for Decellularizing Mouse Cochleae for Inner Ear Tissue Engineering
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Changes in mRNA expression in mouse postnatal cochlea by differential display method.

Kazusaku Kamiya1, Yoshiaki Kikkawa, Yoshiyuki Ishii

  • 1Department of Biomedical Science, Graduate School of Agricultural and Life Sciences, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.

Experimental Animals
|November 28, 2002
PubMed
Summary
This summary is machine-generated.

This study identified mouse TIS7 gene expression changes in the developing mouse cochlea. Increased TIS7 mRNA levels between postnatal days 11 and 13 suggest its role in spiral ganglion cell differentiation due to initial sound input.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • The postnatal development of the cochlea involves complex cellular differentiation processes.
  • Understanding gene expression changes is crucial for elucidating the mechanisms of auditory system development.

Purpose of the Study:

  • To compare messenger RNA (mRNA) expression profiles in the C3H/HeJ mouse cochlea at different postnatal developmental stages (postnatal day 11, P11; P13; and adult).
  • To identify genes involved in the early postnatal development of the cochlea, particularly those related to neuronal differentiation.

Main Methods:

  • Messenger RNA (mRNA) differential display was employed to compare gene expression.
  • Polyacrylamide gel electrophoresis and polymerase chain reaction (PCR) primer sets were used to identify differentially expressed bands.
  • DNA sequencing and BLAST analysis were performed to identify the sequences of differentially expressed genes.

Main Results:

  • Forty-seven differentially expressed mRNA bands were detected using 27 PCR primer sets.
  • A significant increase in mRNA expression was observed in 24 of these bands between P11 and P13.
  • One identified clone, mouse TIS7, showed increased mRNA expression between P11 and P13, a pattern similar to its differentiation-associated upregulation in PC-12 cells.

Conclusions:

  • The study identified specific genes, including mouse TIS7, that are upregulated during a critical window of postnatal cochlear development.
  • The findings suggest that TIS7 may play a role in the differentiation of neuronal progenitor cells into spiral ganglion cells, potentially triggered by initial sound stimuli.
  • This research provides insights into the molecular mechanisms underlying cochlear maturation and the genes involved in auditory system development.