Targeted ablation of connexin26 in the inner ear epithelial gap junction network causes hearing impairment and cell death.
Mutations in the gene encoding the gap junction protein connexin26 (Cx26) are responsible for the autosomal recessive isolated deafness, DFNB1, which accounts for half of the cases of prelingual profound hereditary deafness in Caucasian populations. To date, in vivo approaches to decipher the role of Cx26 in the inner ear have been hampered by the embryonic lethality of the Cx26 knockout mice. To overcome this difficulty, we performed targeted ablation of Cx26 specifically in one of the two cellular networks that it underlies in the inner ear, namely, the epithelial network. We show that homozygous mutant mice, Cx26(OtogCre), have hearing impairment, but no vestibular dysfunction. The inner ear developed normally. However, on postnatal day 14 (P14), i.e., soon after the onset of hearing, cell death appeared and eventually extended to the cochlear epithelial network and sensory hair cells. Cell death initially affected only the supporting cells of the genuine sensory cell (inner hair cell, IHC), thus suggesting that it could be triggered by the IHC response to sound stimulation. Altogether, our results demonstrate that the Cx26-containing epithelial gap junction network is essential for cochlear function and cell survival. We conclude that prevention of cell death in the sensory epithelium is essential for any attempt to restore the auditory function in DFNB1 patients.
Unité de Génétique des Déficits Sensoriels, CNRS URA 1968, Institut Pasteur, 25 rue du Dr. Roux, 75724 Paris cedex 15, France.
Martine
M
Cohen-Salmon
Thomas
T
Ott
Vincent
V
Michel
Jean Pierre
JP
Hardelin
Isabelle
I
Perfettini
Michel
M
Eybalin
Tao
T
Wu
Daniel C
DC
Marcus
Philine
P
Wangemann
Klaus
K
Willecke
Christine
C
Petit
D000818:Animals; D017209:Apoptosis; D003051:Cochlea / Q000378:metabolism / Q000502:physiology*; D000072259:Connexin 26; D017630:Connexins / Q000235:genetics / Q000502:physiology*; D007758:Ear, Inner / Q000378:metabolism / Q000502:physiology; D004847:Epithelial Cells / Q000166:cytology / Q000378:metabolism; D004848:Epithelium / Q000378:metabolism; D017629:Gap Junctions / Q000378:metabolism*; D034381:Hearing Loss / Q000378:metabolism*; D051379:Mice; D008822:Mice, Transgenic; D010641:Phenotype; D011188:Potassium / Q000378:metabolism
D017630:Connexins; D000072259:Connexin 26; D011188:Potassium