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A quantitative survey of gravity receptor function in mutant mouse strains
Sherri M Jones1, Kenneth R Johnson, Heping Yu
1Department of Communication Sciences and Disorders, East Carolina University, Greenville, NC 27858, USA. jonessh@mail.ecu.edu
Journal of the Association for Research in Otolaryngology : JARO
|October 20, 2005
Summary
This study identified vestibular deficits in mice using vestibular evoked potentials (VsEPs). Many genetic mutations caused absent or abnormal VsEPs, indicating significant gravity receptor and neural conduction deficits.
Area of Science:
- Neuroscience
- Genetics
- Auditory and Vestibular Systems
Background:
- Vestibular deficits can arise from various genetic mutations.
- Understanding these deficits is crucial for diagnosing and treating balance disorders.
Purpose of the Study:
- To identify vestibular deficits in mice using linear vestibular evoked potentials (VsEPs).
- To analyze VsEP parameters in 24 mutant mouse strains and 6 inbred background strains.
Main Methods:
- Measured VsEP thresholds, peak latencies, and peak amplitudes.
- Compared response parameters between mutant homozygotes, heterozygotes, and background controls.
- Contrasted all strain averages with normative ranges.
Main Results:
- Recessive mutations in Espn, Atp2b2, Spnb4, Myo7a, Tmie, Myo6, Pcdh15, Cdh23, Sans, hr, Kcne1, and Pou3f4 caused absent VsEPs in homozygotes.
- Mutations in Catna2, Grid2, Wnt1, qk, Mbps, and Grid2 heterozygotes showed altered VsEP parameters.
- Prolonged latencies in qk and Mbpshi homozygotes correlated with abnormal myelin.
Conclusions:
- Many tested mutations lead to profound gravity receptor deficits.
- Some mutations result in impaired neural conduction, reduced sensitivity, or neural synchrony issues.
- Vestibular dysfunction may also be present in heterozygotes, though less severe.