Human Molecular Genetics, 2002, Vol. 11, No. 16 1887-1898
© 2002 Oxford University Press
Mutation of the novel gene Tmie results in sensory cell defects in the inner ear of spinner, a mouse model of human hearing loss DFNB6
1Department of Otolaryngology/Kresge Hearing Research Institute and 2Department of Human Genetics, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA and 3The Jackson Laboratory, Bar Harbor, Maine 04609, USA
Received April 22, 2002; Accepted June 7, 2002
The recessive mutation at the mouse spinner (sr) locus results in hearing loss and vestibular dysfunction due to neuroepithelial defects in the inner ear. Using a positional cloning strategy, we have identified the mutant locus responsible for this pathology. The affected gene (Tmie) lies within a 40 kb deletion in the original sr allele. In a newly identified allele, Tmie contains a nonsense mutation expected to truncate the C-terminal end of its product. The 153 amino acid protein encoded by the gene shows no similarity to other known proteins, and is predicted to contain a signal peptide and at least one transmembrane domain. Tmie transcripts were identified in several tissues, including the cochlea. Loss of function of Tmie results in postnatal alterations of sensory hair cells in the cochlea, including defects in stereocilia, the apical projections of hair cells that are important in mechanotransduction of sound. These morphological defects are associated with a profound failure to develop normal auditory function. Consistent with a conserved role for this gene in the cochlea, the genetic mapping data presented here support human TMIE as the gene affected at DFNB6, a non-syndromic hearing loss locus. The spinner mutant is thus a valuable model for insight into mechanisms of human deafness and development of sensory cell function.
* To whom correspondence should be addressed at: University of Michigan Medical School, Department of Otolaryngology/Kresge Hearing Research Institute, 9301D MSRB III, 1150 West Medical Center Drive, Ann Arbor, MI 48109-0648, USA. Tel: +1 7347639653; Fax: +1 7346472563; Email: dkohrman{at}umich.edu
AF481144, AF481143 and AF481142
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