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The CD2 isoform of protocadherin-15 is an essential component of the tip-link complex in mature auditory hair cells

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Pepermans, Elise | Vittot, Michel | Goodyear, Richard | Bonnet, Crystel | Abdi, Samia | Dupont, Typhaine | Gherbi, Souad | Holder, Muriel | Makrelouf, Mohamed | Hardelin, Jean-Pierre | Marlin, Sandrine | Zenati, Akila | Richardson, Guy | Avan, Paul | Bahloul, Amel | Petit, Christine

Edité par CCSD ; Wiley Open Access -

International audience. Protocadherin-15 (Pcdh15) is a component of the tip-links, the extracellular filaments that gate hair cell mechano-electrical transduction channels in the inner ear. There are three Pcdh15 splice isoforms (CD1, CD2 and CD3), which only differ by their cyto-plasmic domains; they are thought to function redundantly in mechano-electrical transduction during hair-bundle development, but whether any of these isoforms composes the tip-link in mature hair cells remains unknown. By immunolabelling and both morphological and electrophysiological analyses of post-natal hair cell-specific conditional knockout mice (Pcdh15 ex38-fl/ex38-fl Myo15-cre +/À) that lose only this isoform after normal hair-bundle development, we show that Pcdh15-CD2 is an essential component of tip-links in mature auditory hair cells. The finding, in the homozygous or compound heterozygous state, of a PCDH15 frameshift mutation (p.P1515Tfs*4) that affects only Pcdh15-CD2, in profoundly deaf children from two unrelated families, extends this conclusion to humans. These results provide key information for identification of new components of the mature auditory mechano-electrical trans-duction machinery. This will also serve as a basis for the development of gene therapy for deafness caused by PCDH15 defects.

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