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Severe hearing loss in Dlxl mutant mice.

Daniel B Polley1, Inma Cobos, Michael M Merzenich

  • 1Coleman Memorial Laboratory, Department of Otolaryngology, University of California, San Francisco, CA 94143, USA. daniel.polley@vanderbilt. edu

Hearing Research
|April 25, 2006
PubMed
Summary
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The Dlx1 (Distal-less homeobox 1) gene is crucial for middle ear development. Its mutation causes significant hearing loss in mice, impacting the incus and stapes, leading to elevated auditory thresholds.

Area of Science:

  • Developmental Biology
  • Genetics
  • Otolaryngology

Background:

  • The Dlx homeobox gene family plays a role in middle and inner ear development.
  • Dlx1 (Distal-less homeobox 1) is particularly important for middle ear ossicle development.
  • The impact of Dlx1 gene mutations on hearing thresholds remains unassessed.

Purpose of the Study:

  • To characterize auditory brainstem responses in a Dlx1 gene knockout mouse model.
  • To assess the functional consequences of Dlx1 gene mutation on hearing thresholds.
  • To correlate middle ear ossicle malformations with hearing deficits.

Main Methods:

  • Auditory brainstem response testing using click and tonal stimuli.
  • Comparison of hearing thresholds between homozygous Dlx1 knockout (Dlx1-/-), heterozygous (Dlx1+/-), and wild-type (Dlx1+/+) mice.

Related Experiment Videos

  • Utilizing a non-lethal variant of the Dlx1 gene knockout.

    • Main Results:

    • Homozygous Dlx1 knockout mice exhibited significantly elevated peripheral hearing thresholds.
    • Hearing deficits were observed for both click and tonal auditory stimuli.
    • These findings correlate with previously documented abnormal morphogenesis of the incus and stapes.

    Conclusions:

    • Dlx1 gene deficiency results in a severe peripheral hearing deficit.
    • Abnormal development of the incus and stapes due to Dlx1 mutation directly leads to impaired hearing.
    • This study establishes a functional link between Dlx1 gene expression and auditory function.