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Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
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Auditory development in progressive motor neuronopathy mouse mutants.

Stefan Volkenstein1, Dominik Brors, Stefan Hansen

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Ruhr-University of Bochum, St. Elisabeth-Hospital, Bleichstr. 15, 44787 Bochum, Germany. stefan.volkenstein@rub.de

Neuroscience Letters
|September 9, 2009
PubMed
Summary
This summary is machine-generated.

The progressive motor neuronopathy (pmn) mouse mutant exhibits normal hearing initially, followed by rapid hearing loss after postnatal day 26. This defect is linked to tubulin assembly dysfunction, impacting hearing maintenance.

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Area of Science:

  • Neuroscience
  • Genetics
  • Auditory Science

Background:

  • Progressive motor neuronopathy (pmn) mouse mutants serve as a model for human motoneuron disease.
  • A mutation in the tubulin-specific chaperon E (Tbce) gene causes microtubule disorganization and axonal transport issues in motoneurons.
  • Similar microtubule dysfunction may affect spiral ganglion neurons and cochlear hair cells, leading to hearing disorders.

Purpose of the Study:

  • To investigate hearing development and identify the genetic basis of hearing loss in the pmn mouse mutant.
  • To explore the role of tubulin assembly in auditory function and maintenance.

Main Methods:

  • Auditory brainstem response (ABR) audiometry was used to assess hearing thresholds in pmn mutants and controls.
  • Histological examination of cochlear morphology at various ages.
  • In vitro culture of spiral ganglion explants to evaluate neurite outgrowth.

Main Results:

  • Homozygous pmn mutants showed normal hearing onset but progressive hearing loss starting from postnatal day 26.
  • Cochlear morphology remained normal, but spiral ganglion explants from mutants exhibited reduced neurite length and number.
  • Heterozygous pmn mice did not display hearing defects.

Conclusions:

  • The pmn mouse mutant is a valuable model for studying progressive hearing loss with an initially normal auditory development.
  • Tubulin assembly dysfunction is implicated in the progressive hearing loss observed in pmn mutants.
  • Tubulin assembly plays a critical role in the function and maintenance of the auditory system.