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Alliance"],"published-print":{"date-parts":[[2020,12]]},"abstract":"<jats:p>In mechanosensory hair cells (HCs) of the ear, the transcriptional repressor REST is continuously inactivated by alternative splicing of its pre-mRNA. This mechanism of REST inactivation is crucial for hearing in humans and mice. <jats:italic>Rest<\/jats:italic> is one of many pre-mRNAs whose alternative splicing is regulated by the splicing factor SRRM4; <jats:italic>Srrm4<\/jats:italic> loss-of-function mutation in mice (<jats:italic>Srrm4<\/jats:italic><jats:sup><jats:italic>bv\/bv<\/jats:italic><\/jats:sup>) causes deafness, balance defects, and degeneration of all HC types other than the outer HCs (OHCs). The specific splicing alterations that drive HC degeneration in <jats:italic>Srrm4<\/jats:italic><jats:sup><jats:italic>bv\/bv<\/jats:italic><\/jats:sup> mice are unknown, and the mechanism underlying SRRM4-independent survival of OHCs is undefined. Here, we show that transgenic expression of a dominant-negative REST fragment in <jats:italic>Srrm4<\/jats:italic><jats:sup><jats:italic>bv\/bv<\/jats:italic><\/jats:sup> mice is sufficient for long-term rescue of hearing, balancing, HCs, alternative splicing of <jats:italic>Rest<\/jats:italic>, and expression of REST target genes including the <jats:italic>Srrm4<\/jats:italic> paralog <jats:italic>Srrm3<\/jats:italic>. We also show that in HCs, SRRM3 regulates many of the same exons as SRRM4; OHCs are unique among HCs in that they transiently down-regulate <jats:italic>Rest<\/jats:italic> transcription as they mature to express <jats:italic>Srrm3<\/jats:italic> independently of SRRM4; and simultaneous SRRM4\u2013SRRM3 deficiency causes complete HC loss by preventing inactivation of REST in all HCs. Thus, our data reveal that REST inactivation is the primary and essential role of SRRM4 in the ear, and that OHCs differ from other HCs in the SRRM4-independent expression of the functionally SRRM4-like splicing factor SRRM3.<\/jats:p>","DOI":"10.26508\/lsa.202000841","type":"journal-article","created":{"date-parts":[[2020,10,21]],"date-time":"2020-10-21T23:30:38Z","timestamp":1603323038000},"page":"e202000841","update-policy":"https:\/\/doi.org\/10.26508\/lsa.crossmarkpolicy","source":"Crossref","is-referenced-by-count":16,"title":["Inhibition of a transcriptional repressor rescues hearing in a splicing factor\u2013deficient mouse"],"prefix":"10.26508","volume":"3","author":[{"given":"Yoko","family":"Nakano","sequence":"first","affiliation":[{"name":"Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA"},{"name":"Inflammation Program, Carver College of Medicine, University of Iowa, Iowa City, IA, 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