A Japanese research group has become the first to reveal that the checkerboard-like arrangement of cells in the inner ear’s organ of Corti is vital for hearing. The discovery gives a new insight into how hearing works from the perspective of cell self-organization and will also enable various hearin
The research group included Assistant Professor Hideru Togashi of
In mice in which the cells in the organ of Corti could not form into this checkerboard pattern, only the hair cells died , which resulted in deafness. This mosaic pattern of cells has been observed in various sensory organs in many different kinds of animals. Understanding the mechanism behind how cell self-organization forms these mosaic patterns will help illuminate the functions of a variety of sensory organs and the mechanisms behind disorders.The inner ear cochlea is necessary for hearing sound, and located inside it is the organ of Corti .
The researchers then examined the organs of Corti of the nectin KO mice that underwent the ABR test and found that the number of hair cells had decreased by approximately half. Next they set out to find out why only the hair cells had disappeared. They discovered that after 2 weeks of age, hair cell apoptosis occurred. In addition, examination of the traces of apoptosis revealed that cell death occurred in many cells that had adhered to each other.
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