Journal Article

Mutations in a new scaffold protein <i>Sans</i> cause deafness in Jackson shaker mice

Yoshiaki Kikkawa, Hiroshi Shitara, Shigeharu Wakana, Yuki Kohara, Toyoyuki Takada, Mieko Okamoto, Choji Taya, Kazusaku Kamiya, Yasuhiro Yoshikawa, Hisashi Tokano, Ken Kitamura, Kunihiko Shimizu, Yuichi Wakabayashi, Toshihiko Shiroishi, Ryo Kominami and Hiromichi Yonekawa

in Human Molecular Genetics

Volume 12, issue 5, pages 453-461
Published in print March 2003 | ISSN: 0964-6906
Published online March 2003 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddg042
Mutations in a new scaffold protein Sans cause deafness in Jackson shaker mice

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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.

Journal Article.  4918 words.  Illustrated.

Subjects: Genetics and Genomics

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