Autosomal dominant transmission of diabetes and congenital hearing impairment secondary to a missense mutation in the WFS1 gene
Department of Nutrition, Metabolic Diseases, Endocrinology, University of Aix-Marseille 2, La Timone Hospital, Marseille, France. Diabetic Medicine
(Impact Factor: 3.12).
07/2008; 25(6):657-61. DOI: 10.1111/j.1464-5491.2008.02448.x
Mutations of the WFS1 gene have been implicated in autosomal dominant diseases, such as low-frequency sensorineural hearing impairment (LFSNHI) and/or diabetes mellitus and/or optic atrophy. The aim was to investigate WFS1 gene sequences in a family with diabetes mellitus and hearing impairment.
Three members of a family with a maternally inherited combination of diabetes mellitus and hearing impairment, but no specific mutations in its mitochondrial genome, were investigated for mutations in the WFS1 gene.
This pedigree, in which the proband had non-insulin-dependent diabetes mellitus and congenital hearing impairment and his mother a triple combination of diabetes mellitus, hearing impairment and optic atrophy, was found to be associated with autosomal dominant transmission of the E864K mutation of the WFS1 gene.
In the light of this confirmatory study, we recommend the systematic analysis of WFS1 gene sequences in patients with parentally inherited diabetes mellitus and deafness (+/- optic atrophy), in particular when diabetogenic mtDNA mutations have been excluded.
Available from: Bella Davidov
- "Homozygosity for this mutation is known to cause Wolfram syndrome, which includes optic atrophy and non-insulin-dependent diabetes mellitus (MIM ID 606201.0020) [17,18]. Heterozygosity for this mutation is responsible for non-syndromic low-frequency hearing loss in a Japanese family  with a similar phenotype to that of family K13576. "
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ABSTRACT: Identification of genes responsible for medically important traits is a major challenge in human genetics. Due to the genetic heterogeneity of hearing loss, targeted DNA capture and massively parallel sequencing are ideal tools to address this challenge. Our subjects for genome analysis are Israeli Jewish and Palestinian Arab families with hearing loss that varies in mode of inheritance and severity.
A custom 1.46 MB design of cRNA oligonucleotides was constructed containing 246 genes responsible for either human or mouse deafness. Paired-end libraries were prepared from 11 probands and bar-coded multiplexed samples were sequenced to high depth of coverage. Rare single base pair and indel variants were identified by filtering sequence reads against polymorphisms in dbSNP132 and the 1000 Genomes Project. We identified deleterious mutations in CDH23, MYO15A, TECTA, TMC1, and WFS1. Critical mutations of the probands co-segregated with hearing loss. Screening of additional families in a relevant population was performed. TMC1 p.S647P proved to be a founder allele, contributing to 34% of genetic hearing loss in the Moroccan Jewish population.
Critical mutations were identified in 6 of the 11 original probands and their families, leading to the identification of causative alleles in 20 additional probands and their families. The integration of genomic analysis into early clinical diagnosis of hearing loss will enable prediction of related phenotypes and enhance rehabilitation. Characterization of the proteins encoded by these genes will enable an understanding of the biological mechanisms involved in hearing loss.
Available from: Cor W R J Cremers
- "After examination of the family with autosomal dominant optic neuropathy and deafness, Eiberg et al.  concluded that the patients also had impaired glucose tolerance. Valéro described a French family with the same missense mutation . There were only two affected individuals: the proband and his mother suffered diabetes mellitus with congenital hearing loss. "
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ABSTRACT: To describe the phenotype of a novel Wolframin (WFS1) mutation in a family with autosomal dominant optic neuropathy and deafness. The study is designed as a retrospective observational case series.
Seven members of a Dutch family underwent ophthalmological, otological, and genetical examinations in one institution. Fasting serum glucose was assessed in the affected family members.
All affected individuals showed loss of neuroretinal rim of the optic nerve at fundoscopy with enlarged blind spots at perimetry. They showed a red-green color vision defect at color vision tests and deviations at visually evoked response tests. The audiograms of the affected individuals showed hearing loss and were relatively flat. The unaffected individuals showed no visual deviations or hearing impairment. The affected family members had no glucose intolerance. Leber hereditary optic neuropathy (LHON) mitochondrial mutations and mutations in the Optic atrophy-1 gene (OPA1) were excluded. In the affected individuals, a novel missense mutation c.2508G>C (p.Lys836Asn) in exon 8 of WFS1 was identified.
This study describes the phenotype of a family with autosomal dominant optic neuropathy and hearing impairment associated with a novel missense mutation in WFS1.
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ABSTRACT: This paper reports on a new type of system configuration that allows for multiplexed operation of Ultrasonic Motors (USM). This system consists of a control board and a multiplexer board paired with each USM. The control signal from the controller board sends an address signal to the multiplexer board to enable or disable the ground return link for the motor. The piezo-deflection amplitude from the addressed USM is then connected to the controller board. Each motor is connected in parallel with the power bus. The controller board consists of a microcontroller, a field programmable gate array, a digital frequency synthesizer, a push-pull converter and a hardware interface that allows the user to change control parameters through a LABVIEW graphic user interface. Experimental results confirm that the strategy allows the user to control a number of Shinsei USM60 ultrasonic motors in a sequential fashion.
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