{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T10:06:44Z","timestamp":1792145204959,"version":"4.4.0"},"reference-count":73,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2020,11,26]],"date-time":"2020-11-26T00:00:00Z","timestamp":1606348800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Deutsche Forschungsgemeinschaft (DFG)","award":["Heisenberg-Program (RE 3174\/2-1) and a grant (RE 3174\/3-1)"],"award-info":[{"award-number":["Heisenberg-Program (RE 3174\/2-1) and a grant (RE 3174\/3-1)"]}]},{"name":"University of T\u00fcbingen intramural funding (Fort\u00fcne)","award":["(2545-1-0"],"award-info":[{"award-number":["(2545-1-0"]}]},{"name":"Ministry of Science, Research and Art Baden-W\u00fcrttemberg","award":["To B. V."],"award-info":[{"award-number":["To B. V."]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Genes"],"abstract":"<jats:p>The OTOF gene encodes otoferlin, a critical protein at the synapse of auditory sensory cells, the inner hair cells (IHCs). In the absence of otoferlin, signal transmission of IHCs fails due to impaired release of synaptic vesicles at the IHC synapse. Biallelic pathogenic and likely pathogenic variants in OTOF predominantly cause autosomal recessive profound prelingual deafness, DFNB9. Due to the isolated defect of synaptic transmission and initially preserved otoacoustic emissions (OAEs), the clinical characteristics have been termed \u201cauditory synaptopathy\u201d. We review the broad phenotypic spectrum reported in patients with variants in OTOF that includes milder hearing loss, as well as progressive and temperature-sensitive hearing loss. We highlight several challenges that must be addressed for rapid clinical and genetic diagnosis. Importantly, we call for changes in newborn hearing screening protocols, since OAE tests fail to diagnose deafness in this case. Continued research appears to be needed to complete otoferlin isoform expression characterization to enhance genetic diagnostics. This timely review is meant to sensitize the field to clinical characteristics of DFNB9 and current limitations in preparation for clinical trials for OTOF gene therapies that are projected to start in 2021.<\/jats:p>","DOI":"10.3390\/genes11121411","type":"journal-article","created":{"date-parts":[[2020,11,26]],"date-time":"2020-11-26T22:00:33Z","timestamp":1606428033000},"page":"1411","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":63,"title":["The Many Faces of DFNB9: Relating OTOF Variants to Hearing Impairment"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6719-3447","authenticated-orcid":false,"given":"Barbara","family":"Vona","sequence":"first","affiliation":[{"name":"T\u00fcbingen Hearing Research Centre, Department of Otolaryngology, Head &amp; Neck Surgery, University of T\u00fcbingen Medical Center, 72076 T\u00fcbingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8627-8828","authenticated-orcid":false,"given":"Aboulfazl","family":"Rad","sequence":"additional","affiliation":[{"name":"T\u00fcbingen Hearing Research Centre, Department of Otolaryngology, Head &amp; Neck Surgery, University of T\u00fcbingen Medical Center, 72076 T\u00fcbingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3739-7569","authenticated-orcid":false,"given":"Ellen","family":"Reisinger","sequence":"additional","affiliation":[{"name":"T\u00fcbingen Hearing Research Centre, Department of Otolaryngology, Head &amp; Neck Surgery, University of T\u00fcbingen Medical Center, 72076 T\u00fcbingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,11,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2151","DOI":"10.1056\/NEJMra050700","article-title":"Newborn Hearing Screening\u2014A Silent Revolution","volume":"354","author":"Morton","year":"2006","journal-title":"N. 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