Genetics & Hearing Loss (Genetics and Hearing Loss) by Charles I. Berlin, Bronya J. Keats

By Charles I. Berlin, Bronya J. Keats

For medical researchers in audiology and otolaryngology, this 5th ebook within the Kresge- Mirmelstein Award sequence beneficial properties the court cases of the 1998 symposium. The ebook comprises contributions from major researchers on genetic explanations of listening to loss and contains a CD-ROM containing audio and video photos from a Balinese village with a wide genetically deaf inhabitants that experience followed an indication language indigenous to their tradition. The CD-ROM additionally positive factors samples of yank signal Language and Cued Speech. within the culture of Berlin's prior paintings this booklet offers gorgeous new and evocative info for either researchers and clinicians.

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20-day-old mutant inner hair cells, showing the growth of giant stereocilia. Scale bar represents 1␮m. 17 18 GENETICS AND HEARING LOSS to extension. Furthermore, we saw no obvious detachment of stereocilia rootlets by transmission electron microscopy in neonatal stages. Third, myosin VI might be involved in the delivery of components to the growing stereocilia, because unconventional myosins are often assumed to have a primary cargo-carrying role, and in the Drosophila embryo, the myosin VI homologue has been shown directly to mediate vesicle transport (Mermall, McNally, & Miller, 1994; Mermall, Post, & Mooseker, 1998).

The new deaf mutants are detected by their failure to respond with an ear flick (Preyer reflex) to a brief, high-frequency toneburst. New mutants with balance defects are picked up by their characteristic hyperactive, head-tossing, and/or circling behavior, and these often have hearing impairment in addition to their vestibular dysfunction. This approach has been successful in producing many new mutants, some with completely new phenotypes, and we are localizing the mutations as well as characterizing the auditory defects in them all.

With the extended use of more detailed ways of assessing the state of the cochlear duct, such as scanning and transmission electron microscopy, it has become clear that hair cell degeneration is rarely, if ever, the cause of hearing impairment in hereditary deafness, but that instead the hair cells may have distinct developmental or functional defects that cause the hearing impairment and lead to secondary hair cell degeneration. However, one of the striking realizations from the research in both human and mouse genetic deafness over the past few years has been the importance of the rest of the cochlear duct, and in particular the roles of different cell types in maintaining cochlear homeostasis (Steel & Bussoli, 1999).

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