Article

Novel mutations in the SLC26A4 gene

Audiology Department - C.so Giovecca 203, 44121, University of Ferrara, Italy.
International journal of pediatric otorhinolaryngology (Impact Factor: 1.19). 06/2012; 76(9):1249-54. DOI: 10.1016/j.ijporl.2012.05.014
Source: PubMed

ABSTRACT

Mutations in the SLC26A4 gene (7q22.3–7q31.1) are considered one of the most common causes of genetic hearing loss. There are two clinical forms related to these mutations: syndromic and non-syndromic deafness. The first one is named Pendred Syndrome (PS) when deafness is associated with thyroid goiter; the second is called DFNB4, when no other symptoms are present. Both are transmitted as an autosomal recessive trait, but simple heterozygotes can develop both forms of deafness. Actually it is thought that Pendred Syndrome occurs when both alleles of SLC26A4 gene are mutated; DFNB4 seems due to monoallelic mutations. PS and DFNB4 can be associated with inner ear malformations. In most of the cases (around 80%), these consist in Enlarged Vestibular Aqueduct (EVA). EVA can also be present without SLC26A4 mutations.

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Available from: Alessandro Castiglione
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    • "Coyle et al. (1998) reported four mutations (p.L236P, p.T416P, p.E384G and IVS8 + 1G > A) in SCL26A4 gene in northern Europe (16). Busi et al. (2012) reported two novel mutation (IVS2+1delG and K590X) in SCL26A4 gene and there is no other mutation in GJB2, GJB3, GJB6 and mtDNA (17). "
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    ABSTRACT: Aim: This study aimed to investigate the molecular testing of congenital hearing loss by using next generation sequencing technology. Pendred syndrome (PS) is described by severe bilateral sensorineural hearing loss with goiter. The mutations of SCL26A4 gene can cause PS. Material and Method: We evaluated the feasibility of target-enrichment and massive parallel sequencing technologies to interrogate all mutations of genes (GJB2, GJB3, GJB6, SLC26A4 and for the mitochondrial mutation A1555G) implicated in NSHL, we performed molecular analyses of 14 NSHL families and patients by using Miseq system (Illumina Inc.). Next-Generation sequencing (NGS) technologies provide specificity, sensitivity and reproducibility at levels sufficient to perform genetic diagnosis of hearing loss. Results: We found two different mutations in SCL26A4 gene such as F354S and I588T in both consanguineous families as diagnosed with Pendred syndrome and we reported a novel mutation in SCL26A4 gene. We found no mutation in GJB2, GJB3, GJB6 gene and A1555G mtDNA in this study. Conclusion: These results highlight the benefits using targeted gene panels with NGS technologies in the molecular analysis of nonsyndromic, congenital hearing loss patients. This study assessed the frequency of deafness genes in Turkish children with congenital hearing loss who had been treated with cochlear implantation, and we found a novel mutation (I588T) in SLC26A4 gene. Key Words: Pendred syndrome, Congenital Hearing Loss, Next-Generation sequencing.
    Full-text · Article · Dec 2015
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    • "Coyle et al. (1998) reported four mutations (p.L236P, p.T416P, p.E384G and IVS8 + 1G > A) in SCL26A4 gene in northern Europe (16). Busi et al. (2012) reported two novel mutation (IVS2+1delG and K590X) in SCL26A4 gene and there is no other mutation in GJB2, GJB3, GJB6 and mtDNA (17). "

    Full-text · Article · Jun 2015
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    • "Previous studies [13,24,25]. suggested that SLC26A4 c.919-2A>G is the most frequent mutation in Taiwan and mainland China, and that less-frequent mutations of other exons may be detected by direct DNA sequence analysis [26]. In the present study, 58.8% of patients carrying a heterozygous c.919-2A>G mutation (47/80) had a definite form of SNHL caused by a SLC26A4 mutation. "
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    ABSTRACT: Background Mutations in the SLC26A4 gene, which encodes the anion transporter, pendrin, are a major cause of autosomal recessive non-syndromic hearing loss (NSHL) in some Asian populations. SLC26A4 c.919-2A>G (IVS7-2A>G) is the most common mutation in East Asian deaf populations. To provide a basis for improving the clinical diagnosis of deaf patients, we evaluated 80 patients with the SLC26A4 c.919-2A>G monoallelic mutation from 1065 hearing-impaired subjects and reported the occurrence of a second mutant allele in these patients. Methods The occurrence of a second mutant allele in these 80 patients with a single c.919-2A>G mutation was investigated. Mutation screening was performed by bidirectional sequencing in SLC26A4 exons 2 to 6 and 9 to 21. Results We found that 47/80 patients carried another SLC26A4 c.919-2A>G compound mutation. The five most common mutations were: p.H723R, p.T410M, 15+5G>A (c.1705+5G>A), p.L676Q and p.N392Y. We found a Chinese-specific SLC26A4 mutation spectrum and an associated SLC26A4 contribution to deafness. Conclusion Our study illustrates that mutation analysis of other SLC26A4 exons should be undertaken in deaf patients with a single heterozygous SLC26A4 mutation. Moreover, a model of compound heterozygosity may partially explain the disease phenotype.
    Full-text · Article · Nov 2012 · Journal of Translational Medicine
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