Human Molecular Genetics, 2003, Vol. 12, No. 5 453-461
© 2003 Oxford University Press
Mutations in a new scaffold protein Sans cause deafness in Jackson shaker mice
1Department of Laboratory Animal Science, The Tokyo Metropolitan Institute of Medical Science (Rinshoken), Tokyo 113-8613, Japan, 2Mouse Functional Genomics Research Group, RIKEN Genome Science Center, The Institute of Physical and Chemical Research, Yokohama 244-0804, Japan, 3Department of Biomedical Science, The University of Tokyo, Tokyo 113-8657, Japan, 4Department of Otolaryngology, Tokyo Medical and Dental University, Tokyo 113-8519, Japan, 5Mammalian Genetics Laboratory, National Institute of Genetics, Mishima 411-8540, Japan and 6Department of Gene Regulation Division of Molecular Biology, Niigata Graduate School of Medicine and Dental Science, Niigata 951-8510, Japan
Received October 1, 2002; Accepted December 13, 2002
The Jackson shaker ( js) mouse carries a recessive mutation causing phenotypes such as deafness, abnormal behavior (circling and/or head-tossing) and degeneration of inner ear neuroepithelia. Two alleles have been identified so far, the original js and jsseal. A contig of three BAC clones was isolated by positional cloning. Two of the clones rescue the js phenotype by BAC transgenesis. Analysis of transcripts in an overlapping region of the two clones revealed a gene encoding a new scaffold-like protein, Sans, that showed mutations in the two js mutants. One was a guanine nucleotide insertion in the original js allele and the other a 7-base insertion in the jsseal allele. Both insertions are predicted to inactivate the Sans protein by frameshift mutations resulting in a truncated protein lacking the C-terminal SAM domain. Cochlear hair cells in the js murtants show disorganized stereocilia bundles, and Sans were highly expressed in inner and outer hair cells of cochlea. The existence of major motifs, ankyrin repeats and a SAM domain suggests that Sans may have an important role in the development and maintenance of the stereocilia bundles through protein–protein interaction.
* To whom correspondence should be addressed. Tel: +81 338232105 (ext. 5103); Fax: +81 338247445; Email: yonekawa{at}rinshoken.or.jp
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