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Learn MoreAlternative splicing contributes to gene expression dynamics in many tissues, yet its role in auditory development remains unclear. We performed whole exome sequencing in individuals with sensorineural hearing loss (SNHL) and identified pathogenic mutations in Epithelial Splicing Regulatory Protein 1 (ESRP1). Patient derived induced pluripotent stem cells showed alternative splicing defects consistent with impaired ESRP1 function. To determine how mutations in ESRP1 cause hearing loss we evaluated Esrp1-/- mouse embryos and uncovered alterations in cochlear morphogenesis, auditory hair cell differentiation and cell fate specification. Transcriptome analysis revealed impaired expression and splicing of genes with essential roles in inner ear development and auditory function. In particular, aberrant splicing of Fgfr2 blocked stria vascularis formation due to erroneous ligand usage, which was corrected by reducing Fgf9 gene dosage. These findings implicate mutations in ESRP1 as a novel cause of SNHL and demonstrate the complex interplay between alternative splicing, inner ear development, and auditory function. SOURCE: Douglas,J,Epstein (epsteind@mail.med.upenn.edu) - Douglas J. Epstein University of Pennsylvania
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