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J Exp Biol
January 2025
Laboratory of Function and Evolutionary Morphology, FOCUS, Université de Liège, Liège, Belgique.
The inner ear of teleost fishes is known to serve both auditory and vestibular functions. Many studies have compared otoliths from different species and attempted to understand the observed differences within the light of environmental factors. However, experimental data on how otoliths could adapt are scarce.
View Article and Find Full Text PDFFront Neurosci
January 2025
Department of Otorhinolaryngology, Hannover Medical School, Hanover, Germany.
During cochlear implant (CI) surgery, it is desirable to perform intraoperative measurements such as Electrocochleography (ECochG) to monitor the inner ear function and thereby to support the preservation of residual hearing. However, a significant challenge arises as the recording location of intracochlear ECochG via the CI electrode changes during electrode insertion. This study aimed to investigate the relationships between intracochlear ECochG recordings, the position of the recording contact within the cochlea relative to its anatomy, and the implications for frequency and residual hearing preservation.
View Article and Find Full Text PDFHair cells (HCs) are essential for vestibular function, and irreversible damage to vestibular HCs in mammals is closely associated with vertigo. The stimulation of HC regeneration through exogenous gene delivery represents an ideal therapeutic approach for restoring vestibular function. Overexpression of Atoh1, Pou4f3, and Gfi1 (collectively referred to as APG) has demonstrated efficacy in promoting HC regeneration in the cochlea.
View Article and Find Full Text PDFThe plainfin midshipman fish (Porichthys notatus) relies on the production and reception of social acoustic signals for reproductive success. During spawning, male midshipman produce long duration advertisement calls to attract females, which use their auditory sense to locate and access calling males. While seasonal changes based on reproductive state in inner-ear auditory sensitivity and frequency encoding in midshipman is well documented, little is known about reproductive-state dependent changes in central auditory sensitivity and auditory neural responsiveness to conspecific advertisement calls.
View Article and Find Full Text PDFScience
January 2025
Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China.
Cochlear inner hair cells (IHCs) and outer hair cells (OHCs) require different transcription factors for their cell fate stabilization and survival, suggesting separate mechanisms are involved. Here, we found that the transcription factor Casz1 was crucial for early IHC fate consolidation and for OHC survival during mouse development. Loss of Casz1 resulted in transdifferentiation of IHCs into OHCs, without affecting OHC production.
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