References
Query Results -- Details
MGI Accession ID: MGI:1929048
J Number: J:66740
Other Accession IDs:
Title: Mutation of CDH23, encoding a new member of the cadherin gene family, causes usher syndrome type 1D
Authors: Bolz H; von Brederlow B; Ramirez A; Bryda EC; Kutsche K; Nothwang HG; Seeliger M; Cabrera Md; Vila MC; Molina OP; Kubisch C; Gal A
Journal: Nat Genet
Volume: 27
Issue: 1
Date: 2001 Jan
Year: 2001
Pages: 108-12
Review Status: Peer Reviewed
Abstract:
Usher syndrome type I (USH1) is an autosomal recessive disorder characterized by congenital sensorineural hearing loss, vestibular dysfunction and visual impairment due to early onset retinitis pigmentosa (RP). So far, six loci (USH1A-USH1F) have been mapped, but only two USH1 genes have been identified: MYO7A (ref. 2) for USH1B and the gene encoding harmonin for USH1C. We identified a Cuban pedigree linked to the locus for Usher syndrome type 1D (MIM 601067) within the q2 region of chromosome 10 (ref. 5). Affected individuals present with congenital deafness and a highly variable degree of retinal degeneration. Using a positional candidate approach, we identified a new member of the cadherin gene superfamily, CDH23. It encodes a protein of 3,354 amino acids with a single transmembrane domain and 27 cadherin repeats. In the Cuban family, we detected two different mutations: a severe course of the retinal disease was observed in individuals homozygous for what is probably a truncating splice-site mutation (c.4488G-->C), whereas mild RP is present in individuals carrying the homozygous missense mutation R1746Q. A variable expression of the retinal phenotype was seen in patients with a combination of both mutations. In addition, we identified two mutations, DeltaM1281 and IVS51+5G-->A, in a German USH1 patient. Our data show that different mutations in CDH23 result in USH1D with a variable retinal phenotype. In an accompanying paper, it is shown that mutations in the mouse ortholog cause disorganization of inner ear stereocilia and deafness in the waltzer mouse.
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