Three deaf mice: mouse models for TECTA-based human hereditary deafness reveal domain-specific structural phenotypes in the tectorial membrane

Tecta is a modular, non-collagenous protein of the tectorial membrane (TM), an extracellular matrix of the cochlea essential for normal hearing. Missense mutations in Tecta cause dominant forms of non-syndromic deafness and a genotype–phenotype correlation has been reported in humans, with mutations...

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Bibliographic Details
Published in:Human molecular genetics 2014-05, Vol.23 (10), p.2551-2568
Main Authors: Legan, P. Kevin, Goodyear, Richard J., Morín, Matías, Mencia, Angeles, Pollard, Hilary, Olavarrieta, Leticia, Korchagina, Julia, Modamio-Hoybjor, Silvia, Mayo, Fernando, Moreno, Felipe, Moreno-Pelayo, Miguel-Angel, Richardson, Guy P.
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Animals
Deafness - genetics
Deafness - pathology
Deafness - physiopathology
Disease Models, Animal
Epilepsy, Reflex - genetics
Extracellular Matrix Proteins - genetics
Female
Genetic Association Studies
Genetic Predisposition to Disease
GPI-Linked Proteins - genetics
Hair Cells, Auditory, Inner - pathology
Homozygote
Humans
Male
Mice, 129 Strain
Mice, Transgenic
Molecular Motor Proteins - metabolism
Mutation, Missense
Organ of Corti - pathology
Phenotype
Tectorial Membrane - metabolism
Tectorial Membrane - pathology
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Summary:Tecta is a modular, non-collagenous protein of the tectorial membrane (TM), an extracellular matrix of the cochlea essential for normal hearing. Missense mutations in Tecta cause dominant forms of non-syndromic deafness and a genotype–phenotype correlation has been reported in humans, with mutations in different Tecta domains causing mid- or high-frequency hearing impairments that are either stable or progressive. Three mutant mice were created as models for human Tecta mutations; the TectaL1820F,G1824D/+ mouse for zona pellucida (ZP) domain mutations causing stable mid-frequency hearing loss in a Belgian family, the TectaC1837G/+ mouse for a ZP-domain mutation underlying progressive mid-frequency hearing loss in a Spanish family and the TectaC1619S/+ mouse for a zonadhesin-like (ZA) domain mutation responsible for progressive, high-frequency hearing loss in a French family. Mutations in the ZP and ZA domains generate distinctly different changes in the structure of the TM. Auditory brainstem response thresholds in the 8–40 kHz range are elevated by 30–40 dB in the ZP-domain mutants, whilst those in the ZA-domain mutant are elevated by 20–30 dB. The phenotypes are stable and no evidence has been found for a progressive deterioration in TM structure or auditory function. Despite elevated auditory thresholds, the Tecta mutant mice all exhibit an enhanced tendency to have audiogenic seizures in response to white noise stimuli at low sound pressure levels (≤84 dB SPL), revealing a previously unrecognised consequence of Tecta mutations. These results, together with those from previous studies, establish an allelic series for Tecta unequivocally demonstrating an association between genotype and phenotype.
ISSN:0964-6906
1460-2083
DOI:10.1093/hmg/ddt646