TMTC2 variant associated with sensorineural hearing loss and auditory neuropathy spectrum disorder in a family dyad
H Guillen‐Ahlers, CB Erbe… - … Genetics & Genomic …, 2018 - Wiley Online Library
H Guillen‐Ahlers, CB Erbe, FD Chevalier, MJ Montoya, KD Zimmerman, CD Langefeld…
Molecular Genetics & Genomic Medicine, 2018•Wiley Online LibraryBackground Sensorineural hearing loss (SNHL) is a common form of hearing loss that can
be inherited or triggered by environmental insults; auditory neuropathy spectrum disorder
(ANSD) is a SNHL subtype with unique diagnostic criteria. The genetic factors associated
with these impairments are vast and diverse, but causal genetic factors are rarely
characterized. Methods A family dyad, both cochlear implant recipients, presented with a
hearing history of bilateral, progressive SNHL, and ANSD. Whole‐exome sequencing was …
be inherited or triggered by environmental insults; auditory neuropathy spectrum disorder
(ANSD) is a SNHL subtype with unique diagnostic criteria. The genetic factors associated
with these impairments are vast and diverse, but causal genetic factors are rarely
characterized. Methods A family dyad, both cochlear implant recipients, presented with a
hearing history of bilateral, progressive SNHL, and ANSD. Whole‐exome sequencing was …
Background
Sensorineural hearing loss (SNHL) is a common form of hearing loss that can be inherited or triggered by environmental insults; auditory neuropathy spectrum disorder (ANSD) is a SNHL subtype with unique diagnostic criteria. The genetic factors associated with these impairments are vast and diverse, but causal genetic factors are rarely characterized.
Methods
A family dyad, both cochlear implant recipients, presented with a hearing history of bilateral, progressive SNHL, and ANSD. Whole‐exome sequencing was performed to identify coding sequence variants shared by both family members, and screened against genes relevant to hearing loss and variants known to be associated with SNHL and ANSD.
Results
Both family members are successful cochlear implant users, demonstrating effective auditory nerve stimulation with their devices. Genetic analyses revealed a mutation (rs35725509) in the TMTC2 gene, which has been reported previously as a likely genetic cause of SNHL in another family of Northern European descent.
Conclusion
This study represents the first confirmation of the rs35725509 variant in an independent family as a likely cause for the complex hearing loss phenotype (SNHL and ANSD) observed in this family dyad.
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