A missense mutation in DCDC2 causes human recessive deafness DFNB66, likely by interfering with sensory hair cell and supporting cell cilia length regulation.

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 Genet

journal_title

Human molecular genetics

authors

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 S

doi

10.1093/hmg/ddv009

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

2482-91

issue

9

eissn

0964-6906

issn

1460-2083

pii

ddv009

journal_volume

24

pub_type

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