A common ancestor for COCH related cochleovestibular (DFNA9) patients in Belgium and The Netherlands bearing the P51S mutation

[...]it is commonly known that many hearing impaired people also suffer from balance problems. [...]it is now recognised that many syndromes with genetic hearing impairment also show a dysfunction of the vestibular system. 3 The prevalence of vestibular dysfunction may be severely underestimated, as it often remains unnoticed until specialised vestibular tests are performed. [...]the data obtained here indicate that the Généthon genetic map around the COCHlocus is not reliable. [...]the intermarker distances around theCOCH gene are unknown and even a rough estimate of the age of the mutation is not feasible.