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Related Experiment Videos

Cochlear dysfunction in the jerker mouse.

K P Steel, G R Bock

    Behavioral Neuroscience
    |June 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    The jerker (je/je) mutant mouse shows progressive cochlear hair cell degeneration. Despite appearing intact, these cells lack function, indicating surface preparations are poor indicators of hair cell health in genetic inner ear defects.

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    Area of Science:

    • Neuroscience
    • Genetics
    • Otolaryngology

    Background:

    • The jerker (je/je) mutant mouse model exhibits progressive cochlear hair cell loss.
    • Early-stage analysis of hair cell integrity may not correlate with auditory function.

    Purpose of the Study:

    • To investigate the functional status of cochlear hair cells in jerker (je/je) mutant mice.
    • To evaluate the utility of surface preparations in assessing hair cell function in genetic inner ear disorders.

    Main Methods:

    • Auditory function assessment via 8th nerve action potentials and cochlear microphonics.
    • Light microscopy of cochlear surface preparations.
    • Measurement of endocochlear potential (EP) and anoxia-induced EP changes.

    Main Results:

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    • Jerker mutants display normal hair cell numbers in youth but progressive degeneration with age.
    • No detectable 8th nerve action potentials or cochlear microphonics in 12-20-day-old mutants, despite apparent hair cell integrity.
    • Elevated endocochlear potential (EP) in mutants during cochlear maturation and altered EP response to anoxia.

    Conclusions:

    • Surface preparations are unreliable indicators of hair cell function in jerker mutants.
    • Functional deficits in jerker mice likely stem from an underlying organ of Corti abnormality, not just hair cell loss.