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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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Updated: May 1, 2026

Initiating Differentiation in Immortalized Multipotent Otic Progenitor Cells
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Sp8 regulates inner ear development.

Hyeyoung A Chung1, Sofia Medina-Ruiz, Richard M Harland

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3200.

Proceedings of the National Academy of Sciences of the United States of America
|April 12, 2014
PubMed
Summary
This summary is machine-generated.

Specificity protein 8 (sp8) is crucial for inner ear development in Xenopus tropicalis. Its down-regulation causes otic vesicle defects, while overexpression induces ectopic ear formation, highlighting its role in initiating and shaping the inner ear.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Neuroscience

Background:

  • The genetic basis of inner ear development is complex and not fully understood.
  • Forward genetic screens are powerful tools for identifying genes involved in developmental processes.

Purpose of the Study:

  • To identify genes regulating inner ear development using a forward genetic screen in Xenopus tropicalis.
  • To elucidate the function of specificity protein 8 (sp8) in otic development.

Main Methods:

  • Forward genetic screen in N-ethyl-N-nitrosourea mutagenized Xenopus tropicalis.
  • Positional cloning to identify the causative gene.
  • Loss-of-function studies using transcription activator-like effector nucleases (TALENs) and morpholino oligonucleotides.
  • Overexpression studies to assess sp8 function.

Main Results:

  • Identified the 'eclipse' (ecl) mutant with enlarged otic vesicles and otoconia defects.
  • Positional cloning revealed that the ecl phenotype is caused by down-regulation of specificity protein 8 (sp8).
  • sp8 depletion led to otic dysmorphogenesis, including uncompartmentalized vesicles and abnormal sensory organs.
  • sp8 overexpression induced ectopic otic vesicles with sensory hair cells, innervation, and otoconia.

Conclusions:

  • Specificity protein 8 (sp8) plays a critical role in the initiation and elaboration of inner ear development.
  • sp8 is essential for proper otic vesicle formation, sensory organ development, and otoconia patterning.
  • This study identifies sp8 as a key regulator of vertebrate inner ear morphogenesis.