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Targeted disruption of mouse Coch provides functional evidence that DFNA9 hearing loss is not a COCH haploinsufficiency disorder

  1. Author:
    Makishima, T.
    Rodriguez, C. I.
    Robertson, N. G.
    Morton, C. C.
    Stewart, C. L.
    Griffith, A. J.

  2. Author Address

    Natl Inst Deafness & Other Commun Disorders, Sect Gene Struct & Funct, NIH, Rockville, MD 20850 USA. NCI, Canc & Dev Biol Lab, NIH, Frederick, MD 21702 USA. Brigham & Womens Hosp, Dept Pathol, Boston, MA 02115 USA. Harvard Univ, Sch Med, Boston, MA 02115 USA. Natl Inst Deafness & Other Commun Disorders, Hearing Sect, NIH, Rockville, MD 20850 USA Stewart, CL, Natl Inst Deafness & Other Commun Disorders, Sect Gene Struct & Funct, NIH, Rockville, MD 20850 USA
    1. Year: 2005
    2. Date: OCT
  2. Journal: Human Genetics
    1. 118
    2. 1
    3. Pages: 29-34
  4. Type of Article: Article
  1. Abstract:

    Dominant progressive hearing loss and vestibular dysfunction DFNA9 is caused by mutations of the human COCH gene. COCH encodes cochlin, a highly abundant secreted protein of unknown function in the inner ear. Cochlin has an N-terminal LCCL domain followed by two vWA domains, and all known DFNA9 mutations are either missense substitutions or an amino acid deletion in the LCCL domain. Here, we have characterized the auditory phenotype associated with a genomic deletion of mouse Coch downstream of the LCCL domain. Homozygous Coch(-/-) mice express no detectable cochlin in the inner ear. Auditory brainstem responses to click and pure-tone stimuli (8, 16, 32 kHz) were indistinguishable among wild type and homozygous Coch(-/-) mice. A Coch-LacZ Delta neo reporter allele detected Coch mRNA expression in nonsensory epithelial and stromal regions of the cochlea and vestibular labyrinth. These data provide functional evidence that DFNA9 is probably not caused by COCH haploinsufficiency, but via a dominant negative or gain-of-function effect, in nonsensory regions of the inner ear

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  1. View record in Web of Science®
  2. WOS: 000233338100004

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