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© Research
Publication : EMBO molecular medicine

CIB2, defective in isolated deafness, is key for auditory hair cell mechanotransduction and survival

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in EMBO molecular medicine - 01 Dec 2017

Michel V, Booth KT, Patni P, Cortese M, Azaiez H, Bahloul A, Kahrizi K, Labbé M, Emptoz A, Lelli A, Dégardin J, Dupont T, Aghaie A, Oficjalska-Pham D, Picaud S, Najmabadi H, Smith RJ, Bowl MR, Brown SD, Avan P, Petit C, El-Amraoui A

Link to Pubmed [PMID] – 29084757

EMBO Mol Med 2017 Dec;9(12):1711-1731

Defects of CIB2, calcium- and integrin-binding protein 2, have been reported to cause isolated deafness, DFNB48 and Usher syndrome type-IJ, characterized by congenital profound deafness, balance defects and blindness. We report here two new nonsense mutations (pGln12* and pTyr110*) in patients displaying nonsyndromic profound hearing loss, with no evidence of vestibular or retinal dysfunction. Also, the generated mice display an early onset profound deafness and have normal balance and retinal functions. In these mice, the mechanoelectrical transduction currents are totally abolished in the auditory hair cells, whilst they remain unchanged in the vestibular hair cells. The hair bundle morphological abnormalities of mice, unlike those of mice defective for the other five known USH1 proteins, begin only after birth and lead to regression of the stereocilia and rapid hair-cell death. This essential role of CIB2 in mechanotransduction and cell survival that, we show, is restricted to the cochlea, probably accounts for the presence in mice and patients, unlike in Usher syndrome, of isolated hearing loss without balance and vision deficits.

https://www.ncbi.nlm.nih.gov/pubmed/29084757