PURPOSE: To identify the genetic defect in a German family with Usher syndrome (USH) and linkage to the USH3A locus. METHODS: DNA samples of five family members (both parents and the three patients) were genotyped with polymorphic microsatellite markers specific for eight USH genes. Three affected family members underwent detailed ocular and audiologic characterization. RESULTS: Symptoms in the patients were compatible with Usher syndrome and show intrafamilial variation, for both hearing loss (ranging from severe to profound with non-linear progression) and vision. Genotyping of microsatellite markers for the different USH loci was in line with a defect in the USH3A gene on chromosome 3q25. Sequence analysis of the USH3A gene revealed two truncating mutations; c.149_152delCAGGinsTGTCCAAT, which has been described previously, and a novel mutation, c.502_503insA, segregating with the phenotype. CONCLUSIONS: To date, only 11 USH3A mutations have been described. This is the first description of a German family with USH due to USH3A mutations, including one novel. Our findings indicate that also in the Central European population, USH3A mutations should be considered in cases of USH.
PURPOSE: To identify the genetic defect in a German family with Usher syndrome (USH) and linkage to the USH3A locus. METHODS: DNA samples of five family members (both parents and the three patients) were genotyped with polymorphic microsatellite markers specific for eight USH genes. Three affected family members underwent detailed ocular and audiologic characterization. RESULTS: Symptoms in the patients were compatible with Usher syndrome and show intrafamilial variation, for both hearing loss (ranging from severe to profound with non-linear progression) and vision. Genotyping of microsatellite markers for the different USH loci was in line with a defect in the USH3A gene on chromosome 3q25. Sequence analysis of the USH3A gene revealed two truncating mutations; c.149_152delCAGGinsTGTCCAAT, which has been described previously, and a novel mutation, c.502_503insA, segregating with the phenotype. CONCLUSIONS: To date, only 11 USH3A mutations have been described. This is the first description of a German family with USH due to USH3A mutations, including one novel. Our findings indicate that also in the Central European population, USH3A mutations should be considered in cases of USH.
Authors: Vincent Michel; Kevin T Booth; Pranav Patni; Matteo Cortese; Hela Azaiez; Amel Bahloul; Kimia Kahrizi; Ménélik Labbé; Alice Emptoz; Andrea Lelli; Julie Dégardin; Typhaine Dupont; Asadollah Aghaie; Danuta Oficjalska-Pham; Serge Picaud; Hossein Najmabadi; Richard J Smith; Michael R Bowl; Steven Dm Brown; Paul Avan; Christine Petit; Aziz El-Amraoui Journal: EMBO Mol Med Date: 2017-12 Impact factor: 12.137
Authors: Gema García-García; María J Aparisi; Regina Rodrigo; María D Sequedo; Carmen Espinós; Jordi Rosell; José L Olea; M Paz Mendívil; María A Ramos-Arroyo; Carmen Ayuso; Teresa Jaijo; Elena Aller; José M Millán Journal: Mol Vis Date: 2012-12-29 Impact factor: 2.367