Abstract:
:Hearing loss is the most common sensory deficit in humans. We show that a point mutation in DCDC2 (DCDC2a), a member of doublecortin domain-containing protein superfamily, causes non-syndromic recessive deafness DFNB66 in a Tunisian family. Using immunofluorescence on rat inner ear neuroepithelia, DCDC2a was found to localize to the kinocilia of sensory hair cells and the primary cilia of nonsensory supporting cells. DCDC2a fluorescence is distributed along the length of the kinocilium with increased density toward the tip. DCDC2a-GFP overexpression in non-polarized COS7 cells induces the formation of long microtubule-based cytosolic cables suggesting a role in microtubule formation and stabilization. Deafness mutant DCDC2a expression in hair cells and supporting cells causes cilium structural defects, such as cilium branching, and up to a 3-fold increase in length ratios. In zebrafish, the ortholog dcdc2b was found to be essential for hair cell development, survival and function. Our results reveal DCDC2a to be a deafness gene and a player in hair cell kinocilia and supporting cell primary cilia length regulation likely via its role in microtubule formation and stabilization.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Grati M,Chakchouk I,Ma Q,Bensaid M,Desmidt A,Turki N,Yan D,Baanannou A,Mittal R,Driss N,Blanton S,Farooq A,Lu Z,Liu XZ,Masmoudi Sdoi
10.1093/hmg/ddv009subject
Has Abstractpub_date
2015-05-01 00:00:00pages
2482-91issue
9eissn
0964-6906issn
1460-2083pii
ddv009journal_volume
24pub_type
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