Mutations in Cdh23 cause nonsyndromic hearing loss in waltzer mice.
Mutations at the waltzer (v) locus result in deafness and vestibular dysfunction due to degeneration of the neuroepithelium within the inner ear. Here, we use a positional cloning approach to show that waltzer encodes a novel cadherin (Cdh23), which is most closely related to the Drosophila Fat protein. A single nucleotide deletion in the v(J) allele and a single nucleotide insertion in the v allele are predicted to truncate each protein near the N-terminus and produce a functional null allele. In situ hybridization analysis showed that Cdh23 is expressed in the sensory hair cells of the inner ear, where it has been suggested to be a molecule critical for crosslinking of the stereocilia. In addition, Cdh23 is expressed in the urticulo-saccular foramen,the ductus reuniens, and Reissner's membrane, suggesting that Cdh23 may also be involved in maintaining the ionic composition of the endolymph. Finally, mutations in human CDH23 have recently been described for two loci, DFNB12 and USH1D, which cause nonsyndromic deafness, identifying waltzer as a mouse model for human hearing loss.
Wilson
S M
SM
Mouse Cancer Genetics Program, National Cancer Institute-Frederick, Frederick, Maryland 21702, USA.
Householder
D B
DB
Coppola
V
V
Tessarollo
L
L
Fritzsch
B
B
Lee
E C
EC
Goss
D
D
Carlson
G A
GA
Copeland
N G
NG
Jenkins
N A
NA
D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D000070585:Cadherin Related Proteins; D015820:Cadherins / Q000096:biosynthesis / Q000235:genetics*; D002874:Chromosome Mapping; D022202:Chromosomes, Artificial, Bacterial; D018244:Chromosomes, Artificial, Yeast; D003001:Cloning, Molecular; D003433:Crosses, Genetic; D018076:DNA, Complementary / Q000378:metabolism; D003638:Deafness / Q000235:genetics* / Q000378:metabolism; D004330:Drosophila; D015723:Gene Library; D006801:Humans; D017403:In Situ Hybridization; D008565:Membrane Proteins / Q000235:genetics; D051379:Mice; D008817:Mice, Mutant Strains; D008957:Models, Genetic; D008969:Molecular Sequence Data; D009154:Mutation; D020161:Physical Chromosome Mapping; D017354:Point Mutation; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D017434:Protein Structure, Tertiary; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014018:Tissue Distribution
C442480:CDH23 protein, human; D000070585:Cadherin Related Proteins; D015820:Cadherins; C499091:Cdh23 protein, mouse; D018076:DNA, Complementary; C502403:FAT1 protein, human; D008565:Membrane Proteins; C502406:fat1 protein, mouse