Clinical Trial: Epidemiology of Non-syndromic Dominant Deafness

Study Status: Completed
Recruit Status: Completed
Study Type: Observational

Official Title: Genetic Epidemiology of Non-syndromic Dominant Deafness

Brief Summary: Hearing impairment is a common disorder that affects at least 7% of individuals in our countries. Even the causes of hearing impairment are numerous, genetic causes represent the main factor of sensorineural deafness. Among hereditary non-syndromic deafness autosomal-dominant inheritance is observed in about 10-20% of the cases. These forms of deafness are usually post-lingual and progressive. To date more than 41 chromosomal localisation and 21 genes associated to non syndromic dominant deafness have been described. It represents an extreme genetic heterogeneity making difficult the studies of these forms of hearing impairment. But, genetic diagnostic testing is crucial in these cases. Indeed, therapeutic research are in the way to prevent the progression of the disorder. The aim of this work is to establish the prevalence of the different genes involved in these forms of deafness.

Detailed Summary: The protocol consists first in the recruitment of 150 families with non syndromic dominant hearing impairment. The families will be recruited by the clinical investigators. The clinic and radiological characteristics of the hearing impairment will be collected by the clinical investigators. Samples of patients and healthy relatives will be sent to the referral center. A linkage study of the whole genome by SNP studies is in progress in a cohort of large families affected by autosomal dominant deafness. This work will enable us to select the loci that may be frequently implicated in our population and screen these genes in the 150 families included in the protocol.
Sponsor: Assistance Publique - Hôpitaux de Paris

Current Primary Outcome: The identification of a deleterious mutation of a gene coding a protein present in the cochlea [ Time Frame: 1 day ]

Original Primary Outcome: Same as current

Current Secondary Outcome: The phenotype genotype relationships after identification of the causative gene and mutation [ Time Frame: 1 day ]

Original Secondary Outcome: Same as current

Information By: Assistance Publique - Hôpitaux de Paris

Dates:
Date Received: March 29, 2010
Date Started: April 2009
Date Completion:
Last Updated: August 6, 2013
Last Verified: August 2013