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Hearing loss can be purely sensorineural or mixed, that is, with both conductive and sensorineural components. Affected males show anatomical abnormalities of the inner ear, which are jointly defined as incomplete partition type III. Current approaches to improve hearing and speech skills of DFNX2 patients do not seem to be fully effective. Owing to inner ear malformations, cochlear implantation is surgically difficult and may predispose towards severe complications. Even in cases where implantation is safely performed, hearing and speech outcomes remain highly variable among patients. Mouse models for DFNX2 deafness revealed that sensorineural loss could arise from a dysfunction of spiral ligament fibrocytes in the lateral wall of the cochlea, which leads to reduced endocochlear potential. Highly positive endocochlear potential is critical for sensory hair cell mechanotransduction and hearing. In this context, here, we propose to develop a therapeutic approach in male <jats:italic>Pou3f4<\/jats:italic><jats:sup>\u2212\/<jats:italic>y<\/jats:italic><\/jats:sup> mice based on an adeno\u2010associated viral (AAV) vector\u2010mediated gene transfer in cochlear spiral ligament fibrocytes. Among a broad range of AAV vectors, AAV7 was found to show a strong tropism for the spiral ligament. Thus, we suggest that an AAV7\u2010mediated delivery of <jats:italic>Pou3f4<\/jats:italic> complementary DNA in the spiral ligament of <jats:italic>Pou3f4<\/jats:italic><jats:sup>\u2212\/<jats:italic>y<\/jats:italic><\/jats:sup> mice could represent an attractive strategy to prevent fibrocyte degeneration and to restore normal cochlear functions and properties, including a positive endocochlear potential, before hearing loss progresses to profound deafness.<\/jats:p>","DOI":"10.1002\/ibra.12068","type":"journal-article","created":{"date-parts":[[2022,9,28]],"date-time":"2022-09-28T05:08:46Z","timestamp":1664341726000},"page":"431-441","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Considering gene therapy to protect from X\u2010linked deafness DFNX2 and associated neurodevelopmental disorders"],"prefix":"10.1002","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9546-5091","authenticated-orcid":false,"given":"Jean","family":"Defourny","sequence":"first","affiliation":[{"name":"GIGA\u2010Neurosciences, Unit of Cell and Tissue Biology University of Li\u00e8ge, C.H.U. 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