A systematic review of hearing and vestibular function in carriers of the Pro51Ser mutation in the COCH gene
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Background and objectives
The Pro51Ser (P51S) COCH mutation is characterized by a late-onset bilateral sensorineural hearing loss (SNHL) and progressive vestibular deterioration. The aim of this study was to carry out a systematic review of all reported hearing and vestibular function data in P51S COCH mutation carriers and its correlation with age.
Materials and methods
Scientific databases including Medline, Cochrane Database of Systematic Reviews, Cochrane Central Register of Controlled Trials, ISI Web of Knowledge, and Web of Science were searched to accumulate information about hearing outcome and vestibular function. Eleven genotype–phenotype correlation studies of the P51S COCH variant were identified and analyzed.
The SNHL starts at the age of 32.8 years. The Annual Threshold Deterioration is 3 decibel hearing loss (dB HL) per year (1–24 dB HL/year). Profound SNHL was observed at 76 years on average (60–84 years). 136 individual vestibular measurements were collected from 86 carriers. The onset of the vestibular dysfunction was estimated around 34 years (34–40 years), and vestibular deterioration rates were higher than those of the SNHL, with complete bilateral loss observed between 49 and 60 years.
Both audiometric and vestibular data were processed with much different methodologies and pre-symptomatic P51S carriers were systematically underrepresented. Further delineation of this correlation would benefit cross-sectional and longitudinal study involving all (pre-symptomatic and symptomatic) P51S carriers.
KeywordCOCH mutation DFNA9 Hearing Vestibular function
There are no funding to report.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants performed by any of the authors.
The study is a systematic review, and therefore, with a retrospective design. Therefore, informant consent was not applicable for this study.
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