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Article type: Research Article
Authors: Street, Valerie A.a; * | Kallman, Jeremy C.a | Strombom, Paul D.b | Bramhall, Naomi F.c | Phillips, James O.a
Affiliations: [a] V.M. Bloedel Hearing Research Center, Otolaryngology – HNS Department, University of Washington, Seattle, WA 98195-5060, USA | [b] Biomedical Engineering Department, Brown University, Providence, RI 02912, USA | [c] Speech and Hearing Sciences Department, University of Washington, Seattle, WA 98195-5060, USA
Correspondence: [*] Corresponding author: Valerie A. Street, Ph.D., Box 357923, V.M. Bloedel Hearing Research Center, Otolaryngology – HNS Department, University of Washington, Seattle, WA 98195, USA. Tel.: +1 206 221 5435; Fax: +1 206 221 5685; E-mail: vastreet@u.washington.edu
Abstract: The inner ear contains the developmentally related cochlea and peripheral vestibular labyrinth. Given the similar physiology between these two organs, hearing loss and vestibular dysfunction may be expected to occur simultaneously in individuals segregating mutations in inner ear genes. Twenty-two different genes have been discovered that when mutated lead to non-syndromic autosomal dominant hearing loss. A review of the literature indicates that families segregating mutations in 13 of these 22 genes have undergone formal clinical vestibular testing. Formal assessment revealed vestibular dysfunction in families with mutations in ten of these 13 genes. Remarkably, only families with mutations in the COCH and MYO7A genes self-report considerable vestibular challenges. Families segregating mutations in the other eight genes do not self-report significant balance problems and appear to compensate well in everyday life for vestibular deficits discovered during formal clinical vestibular assessment. An example of a family (referred to as the HL1 family) with progressive hearing loss and clinically-detected vestibular hypofunction that does not report vestibular symptoms is described in this review. Notably, one member of the HL1 family with clinically-detected vestibular hypofunction reached the summit of Mount Kilimanjaro.
Keywords: Non-sydromic deafness (DFN), calorics, ocular motor, vestibulo-ocular reflex, velocity step test, cervico-ocular reflex, computerized dynamic posturography, vestibular evoked myogenic potential
DOI: 10.3233/VES-2008-18105
Journal: Journal of Vestibular Research, vol. 18, no. 1, pp. 51-58, 2008
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