A Mutation in CABP2, Expressed in Cochlear Hair Cells, Causes Autosomal-Recessive Hearing Impairment

CaBPs are a family of Ca(2+)-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 Ca(2+) signaling through effectors such as voltage-gated Ca(v) Ca(2...

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Veröffentlicht in:American journal of human genetics 2012-10, Vol.91 (4), p.636-645
Hauptverfasser: SCHRAUWEN, Isabelle, HELFMANN, Sarah, DHEEDENE, Annelies, CLAES, Charlotte, FRANSEN, Erik, HASHEMZADEH CHALESHTORI, Morteza, COUCKE, Paul, LEE, Amy, MOSER, Tobias, VAN CAMP, Guy, INAGAKI, Akira, PREDOEHL, Friederike, AMIN TABATABAIEFAR, Mohammad, MAGDALENA PICHER, Maria, SOMMEN, Manou, ZAZO SECO, Celia, OOSTRIK, Jaap, KREMER, Hannie
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Sprache:eng
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Zusammenfassung:CaBPs are a family of Ca(2+)-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 Ca(2+) signaling through effectors such as voltage-gated Ca(v) Ca(2+) channels. In this study, we identified a splice-site mutation (c.637+1G>T) in Ca(2+)-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(∗)4). Compared with wild-type CaBP2, the truncated CaBP2 showed altered Ca(2+) binding in isothermal titration calorimetry and less potent regulation of Ca(v)1.3 Ca(2+) channels. We show that genetic defects in CABP2 cause moderate-to-severe sensorineural hearing impairment. The mutation might cause a hypofunctional CaBP2 defective in Ca(2+) sensing and effector regulation in the inner ear.
ISSN:0002-9297
1537-6605
DOI:10.1016/j.ajhg.2012.08.018