Abstract
To describe the findings of audiovestibular and ophthalmologic examinations in four families with mutations in the CDH23 gene. Family study. Tertiary referral center. Four DFNB12 patients from a large consanguineous Dutch family and six patients from three different Usher syndrome Type ID families were examined. All were identified by at least one pathogenic mutation in the CDH23 gene. Audiovestibular examinations consisted of standard pure-tone audiometry, vestibulo-ocular reflex, optokinetic nystagmus, and in some cases the cervico-ocular reflex. Linear regression analysis was used to evaluate progression of hearing impairment, and the degree of hearing impairment of DFNB12 was compared with that found for USH1D. Ophthalmologic examinations consisted of best-corrected visual acuity, Goldmann perimetry, slit-lamp examinations, color vision testing, dark adaptation, electroretinography, electro-oculography, funduscopy and photography of the retina, and sometimes fluorescein angiography. The USH1D patients had significantly worse hearing impairment than the DFNB12 patients. The DFNB12 patients, identified by missense mutations in CDH23, had normal retinal and vestibular function. All USH1D patients had splice-site mutations in C...Continue Reading
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