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Related Concept Videos

The Vestibular System01:29

The Vestibular System

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The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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Equilibrium and Balance01:15

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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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Related Experiment Video

Updated: Jun 28, 2025

An Isolated Semi-intact Preparation of the Mouse Vestibular Sensory Epithelium for Electrophysiology and High-resolution Two-photon Microscopy
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An Isolated Semi-intact Preparation of the Mouse Vestibular Sensory Epithelium for Electrophysiology and High-resolution Two-photon Microscopy

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TMC function, dysfunction, and restoration in mouse vestibular organs.

Evan M Ratzan1, John Lee1, Margot A Madison1

  • 1Department of Otolaryngology, F.M. Kirby Neurobiology Center, Boston Children's Hospital and Harvard Medical School, Boston, MA, United States.

Frontiers in Neurology
|April 19, 2024
PubMed
Summary
This summary is machine-generated.

The TMC1 and TMC2 proteins are crucial for hearing and balance. Loss of TMC1 disrupts vestibular-evoked potentials, but gene therapy can restore function in mice.

Keywords:
TMC1TMC2hair cellsacculesemicircular canalutriclevestibular

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Area of Science:

  • Neuroscience
  • Genetics
  • Otolaryngology

Background:

  • TMC1 and TMC2 are essential for mechanosensory transduction in the inner ear.
  • Their precise roles and expression patterns in vestibular organs require further investigation.

Purpose of the Study:

  • To investigate the expression and function of TMC1 and TMC2 in vestibular organs.
  • To determine the impact of TMC1 and TMC2 loss on vestibular function.
  • To evaluate the efficacy of TMC1 gene replacement therapy.

Main Methods:

  • Quantitative polymerase chain reaction (qPCR) and fluorescence in situ hybridization - hairpin chain reaction (FISH-HCR).
  • Immunostaining, FM1-43 uptake assays, and measurement of vestibular evoked potentials (VsEPs) and vestibular ocular reflexes (VORs).
  • Analysis of Tmc1 knockout (KO) and Tmc2 KO mouse models.

Main Results:

  • TMC1 and TMC2 exhibit dynamic developmental changes and distinct regional expression patterns in the utricle and saccule.
  • Tmc1 KO mice showed a loss of VsEPs and VORs, while Tmc2 KO mice retained VsEPs.
  • Neonatal Tmc1 gene replacement therapy restored VsEPs in Tmc1 KO mice for up to six months.

Conclusions:

  • TMC1 and TMC2 play critical, distinct roles in vestibular mechanotransduction.
  • TMC1 is essential for vestibular-evoked potentials and vestibular ocular reflexes.
  • TMC1 gene replacement therapy offers a potential therapeutic strategy for vestibular dysfunction.