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

Tomoko Makishima, Clara I. Rodriguez, Nahid G. Robertson, Cynthia C. Morton, Colin L. Stewart, Andrew J. Griffith

Research output: Contribution to journalArticle

24 Citations (Scopus)

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-LacZDeltaneo 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.

Original languageEnglish (US)
Pages (from-to)29-34
Number of pages6
JournalHuman genetics.
Volume118
Issue number1
StatePublished - Oct 2005
Externally publishedYes

Fingerprint

Haploinsufficiency
Inner Ear
Hearing Loss
Labyrinth Vestibule
Brain Stem Auditory Evoked Potentials
Cochlea
Missense Mutation
Amino Acid Substitution
Alleles
Phenotype
Messenger RNA
Mutation
Genes
Proteins

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

Cite this

Makishima, T., Rodriguez, C. I., Robertson, N. G., Morton, C. C., Stewart, C. L., & Griffith, A. J. (2005). Targeted disruption of mouse Coch provides functional evidence that DFNA9 hearing loss is not a COCH haploinsufficiency disorder. Human genetics., 118(1), 29-34.

Targeted disruption of mouse Coch provides functional evidence that DFNA9 hearing loss is not a COCH haploinsufficiency disorder. / Makishima, Tomoko; Rodriguez, Clara I.; Robertson, Nahid G.; Morton, Cynthia C.; Stewart, Colin L.; Griffith, Andrew J.

In: Human genetics., Vol. 118, No. 1, 10.2005, p. 29-34.

Research output: Contribution to journalArticle

Makishima, T, Rodriguez, CI, Robertson, NG, Morton, CC, Stewart, CL & Griffith, AJ 2005, 'Targeted disruption of mouse Coch provides functional evidence that DFNA9 hearing loss is not a COCH haploinsufficiency disorder.', Human genetics., vol. 118, no. 1, pp. 29-34.
Makishima, Tomoko ; Rodriguez, Clara I. ; Robertson, Nahid G. ; Morton, Cynthia C. ; Stewart, Colin L. ; Griffith, Andrew J. / Targeted disruption of mouse Coch provides functional evidence that DFNA9 hearing loss is not a COCH haploinsufficiency disorder. In: Human genetics. 2005 ; Vol. 118, No. 1. pp. 29-34.
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