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Human Molecular Genetics, 2003, Vol. 12, No. 10 1155-1162
DOI: 10.1093/hmg/ddg127
© 2003 Oxford University Press

Prestin, a cochlear motor protein, is defective in non-syndromic hearing loss

Xue Zhong Liu1,*, Xiao Mei Ouyang1, Xia Juan Xia2, Jing Zheng3, Arti Pandya2, Fang Li1, Li Lin Du1, Katherine O. Welch4, Christine Petit5, Richard J.H. Smith6, Bradley T. Webb2, Denise Yan1, Kathleen S. Arnos4, David Corey7, Peter Dallos3, Walter E. Nance2 and Zheng Yi Chen8

1Department of Otolaryngology, University of Miami, Miami, FL 33101, USA, 2Department of Human Genetics, Medical College of Virginia, Virginia Commonwealth University, Richmond, VA 23298-0033, USA, 3Department of Communication Sciences and Disorders, Auditory Physiology Laboratory (The Hugh Knowles Center), Northwestern University, Evanston, IL, USA, 4Department of Biology, Gallaudet University, Washington, DC 20002, USA, 5Unité de Génétique des Déficits Sensoriels, CNRS URA 1968, Institut Pasteur, Paris, France, 6Department of Otolaryngology University of Iowa, Iowa City, IA 52242, USA, 7Neurobiology Department, Harvard Medical School and Howard Hughes Medical Institute, Boston, MA, USA and 8Department of Neurology, Massachusetts General Hospital and Neurology Department, Harvard Medical School Boston, MA 02114, USA

Received January 14, 2003; Accepted March 14, 2003

Prestin, a membrane protein that is highly and almost exclusively expressed in the outer hair cells (OHCs) of the cochlea, is a motor protein which senses membrane potential and drives rapid length changes in OHCs. Surprisingly, prestin is a member of a gene family, solute carrier (SLC) family 26, that encodes anion transporters and related proteins. Of nine known human genes in this family, three (SLC26A2, SLC26A3 and SLC26A4) are associated with different human hereditary diseases. The restricted expression of prestin in OHCs, and its proposed function as a mechanical amplifier, make it a strong candidate gene for human deafness. Here we report the cloning and characterization of four splicing isoforms for the human prestin gene (SLC26A5a, b, c and d). SLC26A5a is the predominant form of prestin whereas the others showed limited distribution associated with certain developmental stages. Based on the functional importance of prestin we screened for possible mutations involving the prestin gene in a group of deaf probands. We have identified a 5'-UTR splice acceptor mutation (IVS2-2A>G) in exon 3 of the prestin gene, which is responsible for recessive non-syndromic deafness in two unrelated families. In addition, a high frequency of heterozygosity for the same mutation was observed in these subjects, suggesting the possibility of semi-dominant influence of the mutation in causing hearing loss. Finally, the observation of this mutation only in the Caucasian probands indicated an association with a specific ethnic background. This study thereby reveals an essential function of prestin in human auditory processing.

* To whom correspondence should be addressed at: Department of Otolaryngology (D-48), University Of Miami, 1666 NW 12th Avenue, Miami, FL 33136, USA. Tel: +1 3052435695; Fax: +1 3052434925; Email: xliu{at}med.miami.edu


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