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Familial progressive vestibulocochlear dysfunction caused by a COCH mutation (DFNA9).
W I Verhagen1, S J Bom, P L Huygen
1Department of Neurology, Canisius-Wilhelmina Hospital, PO Box 9015, 6500 GS, Nijmegen, The Netherlands. knf@cwz.nl.
Archives of Neurology
|July 13, 2000
Summary
A rare COCH gene mutation caused progressive hearing loss and vestibular dysfunction in a man over 15 years. This autosomal dominant disorder presented with fluctuating symptoms, distinct from Meniere disease.
Area of Science:
- Genetics
- Otolaryngology
- Neuroscience
Background:
- Vestibulocochlear dysfunction can arise from genetic mutations.
- The COCH gene, located on chromosome 14q12-13, is implicated in hearing and balance disorders.
- DFNA9 is an autosomal dominant form of vestibulocochlear dysfunction.
Observation:
- A 50-year-old man experienced progressive sensorineural hearing loss and dysequilibrium over 15 years.
- Symptoms included instability in the dark, oscillopsia, vertigo, and tinnitus.
- Initial unilateral, high-frequency hearing loss progressed to severe bilateral impairment and vestibular areflexia.
Findings:
- The patient's condition was attributed to a Pro51Ser mutation in the COCH gene.
- Vestibulocochlear function showed documented fluctuations.
- The clinical presentation shared similarities with Meniere disease but had distinct features.
Implications:
- This case highlights the phenotypic variability of COCH gene mutations.
- Understanding this disorder aids in differential diagnosis for Meniere-like conditions.
- Further research into COCH gene mutations can inform genetic counseling and potential therapies.