Title
A mutation in CABP2, expressed in cochlear hair cells, causes autosomal-recessive hearing impairment
Author
Faculty/Department
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences . Biomedical Sciences
Publication type
article
Publication
New York, N.Y. ,
Subject
Human medicine
Source (journal)
The American journal of human genetics. - New York, N.Y.
Volume/pages
91(2012) :4 , p. 636-645
ISSN
0002-9297
ISI
000309568500006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
CaBPs are a family of Ca2+-binding proteins related to calmodulin and are localized in the brain and sensory organs, including the retina and cochlea. Although their physiological roles are not yet fully elucidated, CaBPs modulate Ca2+ signaling through effectors such as voltage-gated Ca-v Ca2+ channels. In this study, we identified a splice-site mutation (c.637+1G>T) in Ca2+-binding protein 2 (CABP2) in three consanguineous Iranian families affected by moderate-to-severe hearing loss. This mutation, most likely a founder mutation, probably leads to skipping of exon 6 and premature truncation of the protein (p.Phe164Serfs(star)4). Compared with wild-type CaBP2, the truncated CaBP2 showed altered Ca2+ binding in isothermal titration calorimetry and less potent regulation of Ca(v)1.3 Ca2+ channels. We show that genetic defects in CABP2 cause moderate-to-severe sensorineural hearing impairment. The mutation might cause a hypofunctional CaBP2 defective in Ca2+ sensing and effector regulation in the inner ear.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/1d2f1e/5008.pdf
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