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Alterations of the CIB2 calcium- and integrin-binding protein cause Usher syndrome type 1J and nonsyndromic deafness DFNB48.

Nature genetics | Nov 29, 2012

http://www.ncbi.nlm.nih.gov/pubmed/23023331

Sensorineural hearing loss is genetically heterogeneous. Here, we report that mutations in CIB2, which encodes a calcium- and integrin-binding protein, are associated with nonsyndromic deafness (DFNB48) and Usher syndrome type 1J (USH1J). One mutation in CIB2 is a prevalent cause of deafness DFNB48 in Pakistan; other CIB2 mutations contribute to deafness elsewhere in the world. In mice, CIB2 is localized to the mechanosensory stereocilia of inner ear hair cells and to retinal photoreceptor and pigmented epithelium cells. Consistent with molecular modeling predictions of calcium binding, CIB2 significantly decreased the ATP-induced calcium responses in heterologous cells, whereas mutations in deafness DFNB48 altered CIB2 effects on calcium responses. Furthermore, in zebrafish and Drosophila melanogaster, CIB2 is essential for the function and proper development of hair cells and retinal photoreceptor cells. We also show that CIB2 is a new member of the vertebrate Usher interactome.

Pubmed ID: 23023331 RIS Download

Mesh terms: Animals | COS Cells | Calcium-Binding Proteins | Cercopithecus aethiops | Drosophila melanogaster | Genetic Linkage | Hair Cells, Vestibular | Hearing Loss, Sensorineural | Humans | Mice | Mutation | Pedigree | Protein Conformation | Structure-Activity Relationship | Usher Syndromes | Zebrafish

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Associated grants

  • Agency: NIDCD NIH HHS, Id: DC000039-15
  • Agency: NIDCD NIH HHS, Id: DC011651
  • Agency: NHGRI NIH HHS, Id: N01-HG-65403
  • Agency: NIDCD NIH HHS, Id: R00 DC009287
  • Agency: NIDCD NIH HHS, Id: R00 DC009287
  • Agency: NIDCD NIH HHS, Id: R01 DC008861
  • Agency: NIDCD NIH HHS, Id: R01 DC009645
  • Agency: NIDCD NIH HHS, Id: R01 DC011651
  • Agency: NIDCD NIH HHS, Id: R01 DC011748
  • Agency: NIDCD NIH HHS, Id: R01 DC011748
  • Agency: NIDCD NIH HHS, Id: R01 DC011803
  • Agency: NIDCD NIH HHS, Id: R01 DC011803
  • Agency: NIDCD NIH HHS, Id: R01 DC012564
  • Agency: NIDCD NIH HHS, Id: R01 DC012564
  • Agency: NIDCD NIH HHS, Id: R01 DC03594
  • Agency: NEI NIH HHS, Id: R01 EY014648
  • Agency: NHLBI NIH HHS, Id: R01 HL092544
  • Agency: Intramural NIH HHS, Id: Z01 DC000039-12

ZFIN (Data, Gene Expression)

Comparative Toxicogenomics Database (Data, Disease Annotation)

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