Progression of cochlear and retinal degeneration in the tubby (rd5) mouse

Kevin K. Ohlemiller, Ruth M. Hughes, Jaclynn M. Lett, Judith Mosinger Ogilvie, Judith D. Speck, James S. Wright, Brian T. Faddis

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44 Scopus citations

Abstract

Mice homozygous for a defect of the tub (rd5) gene exhibit cochlear and retinal degeneration combined with obesity, and resemble certain human autosomal recessive sensory deficit syndromes. To establish the progressive nature of sensory cell loss associated with the tub gene, and to differentiate tub-related losses from those associated with the C57 background on which tub arose, we evaluated cochleas and retinas from tub/ tub, tub/+, and +/+ mice, aged 2 weeks to 1 year by light and electron microscopy. Cochleas from mice of all three genotypes show progressive inner (IHC) and outer hair cell (OHC) loss. Relative to tub/+ and +/+ animals, however, tub homozygotes show accelerated OHC loss, affecting the extreme cochlear base (hook region) by 1 month, and the apex by 6 months. IHC loss in tub/tub animals is accelerated in the basal half of the cochlea, affecting the hook region by 6 months. Spiral ganglion cell losses were observed only in tub/tub mice, and only in the cochlear base. Retinas of tub/tub mice are abnormal at maturity, exhibiting shortened photoreceptor outer segments by 2 weeks, and progressive photoreceptor loss thereafter. Because the tub mutation causes degeneration of sensory cells in the ear and eye but has no other neurological effects, tubby mice hold unique promise for the study of human syndromic sensory loss.

Original languageEnglish
Pages (from-to)175-185
Number of pages11
JournalAudiology and Neuro-Otology
Volume2
Issue number4
DOIs
StatePublished - Jan 1 1997

Keywords

  • Alstrom’s syndrome
  • Bardet-Biedl syndrome
  • Cochlea
  • Hair cells
  • Rd5 mouse
  • Retina
  • Tub gene
  • Tubby mouse
  • Usher’s syndrome

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    Ohlemiller, K. K., Hughes, R. M., Lett, J. M., Ogilvie, J. M., Speck, J. D., Wright, J. S., & Faddis, B. T. (1997). Progression of cochlear and retinal degeneration in the tubby (rd5) mouse. Audiology and Neuro-Otology, 2(4), 175-185. https://doi.org/10.1159/000259242