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Scientific Fields
Diseases
Organisms
Applications
Technique

Published in iScience - 22 Dec 2022

Calvet C, Peineau T, Benamer N, Cornille M, Lelli A, Plion B, Lahlou G, Fanchette J, Nouaille S, Boutet de Monvel J, Estivalet A, Jean P, Michel V, Sachse M, Michalski N, Avan P, Petit C, Dulon D, Safieddine S

Link to Pubmed [PMID] – 36483015

Link to DOI – 10.1016/j.isci.2022.105628

iScience 2022 Dec; 25(12): 105628

Hearing depends on fast and sustained calcium-dependent synaptic vesicle fusion at the ribbon synapses of cochlear inner hair cells (IHCs). The implication of the canonical neuronal SNARE complex in this exocytotic process has so far remained controversial. We investigated the role of SNAP-25, a key component of this complex, in hearing, by generating and analyzing a conditional knockout mouse model allowing a targeted postnatal deletion of Snap-25 in IHCs. Mice subjected to IHC Snap-25 inactivation after hearing onset developed severe to profound deafness because of defective IHC exocytosis followed by ribbon degeneration and IHC loss. Viral transfer of Snap-25 in these mutant mice rescued their hearing function by restoring IHC exocytosis and preventing synapses and hair cells from degeneration. These results demonstrate that SNAP-25 is essential for normal hearing function, most likely by ensuring IHC exocytosis and ribbon synapse maintenance.

https://pubmed.ncbi.nlm.nih.gov/36483015