Neurotological and Neuroanatomical Changes in the Connexin-26-Related HID/KID SyndromeTodt I.a · Hennies H.C.c · Küster W.d · Smolle J.e · Rademacher G.b · Mutze S.b · Basta D.a · Eisenschenk A.a · Ernst A.a
Departments of aOtolaryngology and bRadiology at UKB, Hospital of the University of Berlin (Charité Medical School), cDepartment of Molecular Genetics and Gene Mapping, Max Delbrück Center for Molecular Medicine, Berlin, and dDepartment of Dermatology, Tomesa Clinic, Bad Salzschlirf, Germany; eDepartment of Dermatology, University of Graz, Graz, Austria
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Article / Publication Details
The phenotype of the HID (hystrix-like ichthyosis, deafness)/KID (keratitis, ichthyosis, deafness) syndrome is primarily characterized by skin changes. However, the connexin 26 (Cx 26) autosomal dominant mutation underlying this syndrome is of special neurotological interest. In the present paper, the clinical pattern, audiovestibular and neuroimaging findings and the detailed genetic analysis of 4 patients with identical HID/KID-associated mutation D50N of Cx 26 are reported. The audiological test results demonstrated profound sensorineural hearing loss in all of the patients. Neurotological testing revealed inconsistent abnormalities in dynamic posturography (sensory organization test), but the vestibular ocular reflex upon caloric irrigation was normal in all patients. Vestibular-evoked myogenic potential testing for otolith function (saccule) showed a regular response in 1 patient and pathologic responses in 3 patients, while subjective haptic vertical (utricular function) testing was normal in all of the patients. CCT showed an extended (in length), but very thin (in diameter) bony lining between the basal portion of the internal auditory canal and the vestibule in the 3 scanned patients. Our study provides evidence for functionally intact semicircular canals and normal utricular function in subjects with the autosomal dominant D50N mutation of Cx 26, in contrast to saccular function which was generally compromised and hearing loss which was profound.
© 2006 S. Karger AG, Basel
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