Inner ear abnormalities in a Kcnq1 (Kvlqt1) knockout mouse: A model of Jervell and Lange-Nielsen syndrome

Alejandro Rivas, Howard W. Francis

Research output: Contribution to journalArticlepeer-review

Abstract

Hypothesis: Mice lacking functional KCNQ1 (previously known as KvLQT1) channels exhibit functional and structural abnormalities that indicate disturbed production of endolymph. Background: Congenital deafness associated with cardiac conduction abnormalities (Jervell and Lange-Nielsen syndrome) is associated with dysfunctional KCNQ1/KCNE1 channel complex. This potassium channel plays a critical role in the production and homeostasis of endolymph by the stria vascularis. A preliminary report documented severe abnormalities of the scala media and vestibular compartments of a single mouse lacking functional KCNQ1 alleles. Methods: Hearing thresholds were measured in three Kcnq1 knockout mice, two heterozygous mice, and one wild-type mouse by auditory brainstem response recordings using clicks, after which the temporal bones were removed. After fixation and dehydration, the ears were embedded in araldite, sectioned at 20-μm thickness, stained with toluidine blue on glass slides, and examined with the light microscope. Results: Kcnq1 knockout mice were deaf and demonstrated circling behavior. They exhibited a marked atrophy of the stria vascularis, contraction of the endolymphatic compartments, and collapse and adhesion of surrounding membranes. There was a complete degeneration of the organ of Corti and an associated degeneration of the spiral ganglion. Conclusion: Kcnq1 knockout mice exhibit histopathologic findings that are comparable to those reported in human temporal bone cases of Jervell and Lange-Nielsen syndrome, and provide further evidence that KCNQ1 channel dysfunction can lead to congenital deafness in this syndrome.

Original languageEnglish (US)
Pages (from-to)415-424
Number of pages10
JournalOtology and Neurotology
Volume26
Issue number3
DOIs
StatePublished - May 2005

Keywords

  • Congenital deafness
  • Inner ear abnormalities
  • Jervell and Lange-Nielsen syndrome
  • Kcnq1 knockout mice
  • Stereology

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Neuroscience(all)

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