1
|
Ruan Y, Wen C, Cheng X, Zhang W, Zhao L, Xie J, Lu H, Ren Y, Meng F, Li Y, Deng L, Huang L, Han D. Genetic screening of newborns for deafness over 11 years in Beijing, China: More infants could benefit from an expanded program. Biosci Trends 2024; 18:303-314. [PMID: 39183030 DOI: 10.5582/bst.2024.01178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2024]
Abstract
Genetic screening of newborns for deafness plays an important role in elucidating the etiology of deafness, diagnosing it early, and intervening in it. Genetic screening of newborns has been conducted for 11 years in Beijing. It started with a chip to screen for 9 variants of 4 genes in 2012; the chip screened for 15 variants of those genes in 2018, and it now screens for 23 variants of those genes. In the current study, a comparative analysis of three screening protocols and follow-up for infants with pathogenic variants was performed. The rates of detection and hearing test results of infants with pathogenic variants were analyzed. Subjects were 493,821 infants born at 122 maternal and child care centers in Beijing from April 2012 to August 2023. Positivity increased from 4.599% for the chip to screen for 9 variants to 4.971% for the chip to screen for 15 variants, and further to 11.489% for the chip to screen for 23 variants. The carrier frequency of the GJB2 gene increased from 2.489% for the chip to screen for 9 variants and 2.422% for the chip to screen for 15 variants to 9.055% for the chip to screen for 23 variants. The carrier frequency of the SLC26A4 gene increased from 1.621% for the chip to screen for 9 variants to 2.015% for the chip to screen for 15 variants and then to 2.151% for the chip to screen for 23 variants. According to the chip to screen for 9 variants and the chip to screen for 15 variants, the most frequent mutant allele was c.235delC. According to the chip to screen for 23 variants, the most frequent mutant allele was c.109G>A. The chip to screen for 15 variants was used to screen 66.67% (14/21) of newborns with biallelic variants in the SLC26A4 gene for newly added mutations. The chip to screen for 23 variants was used to screen 92.98% (53/57) of newborns with biallelic variants in the GJB2 gene (52 cases were biallelic c.109G>A) and 25% (1/4) of newborns with biallelic variants in the SLC26A4 gene for newly added mutations. Among the infants with pathogenic variants (biallelic variants in GJB2 or SLC26A4), 20.66% (25/121) currently have normal hearing. In addition, 34.62% (9/26) of newborns who passed the hearing screening were diagnosed with hearing loss. Findings indicate that a growing number of newborns have benefited, and especially in the early identification of potential late-onset hearing loss, as the number of screening sites has increased. Conducting long-term audiological monitoring for biallelic variants in individuals with normal hearing is of paramount significance.
Collapse
Affiliation(s)
- Yu Ruan
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Cheng Wen
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Xiaohua Cheng
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Wei Zhang
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Liping Zhao
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Jinge Xie
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Hongli Lu
- CapitalBio Corporation & National Engineering Research Center for Beijing Biochip Technology, Beijing, China
| | - Yonghong Ren
- CapitalBio Corporation & National Engineering Research Center for Beijing Biochip Technology, Beijing, China
| | - Fanlin Meng
- CapitalBio Corporation & National Engineering Research Center for Beijing Biochip Technology, Beijing, China
| | - Yue Li
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Lin Deng
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Lihui Huang
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Demin Han
- Otolaryngology-Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| |
Collapse
|
2
|
Tawalbeh M, Aburizeg D, Abu Alragheb BO, Alaqrabawi WS, Dardas Z, Srour L, Altarayra BH, Zayed AA, El Omari Z, Azab B. SLC26A4 Phenotypic Variability Influences Intra- and Inter-Familial Diagnosis and Management. Genes (Basel) 2022; 13:genes13122192. [PMID: 36553459 PMCID: PMC9778369 DOI: 10.3390/genes13122192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/01/2022] [Accepted: 11/17/2022] [Indexed: 11/25/2022] Open
Abstract
SLC26A4 is one of the most common genes causing autosomal recessive non-syndromic sensorineural hearing loss (SNHL). It has been reported to cause Pendred Syndrome (PDS) and DFNB4 which is deafness with enlarged vestibular aqueduct (EVA). However, mutated SLC26A4 is not conclusive for having either DFNB4 or PDS. Three unrelated Jordanian families consisting of eight affected individuals with congenital bilateral hearing loss (HL) participated in this study. Whole-exome and Sanger sequencing were performed to investigate the underlying molecular etiology of HL. Further clinical investigations, including laboratory blood workup for the thyroid gland, CT scan for the temporal bone, and thyroid ultrasound were performed. Three disease-causing variants were identified in SLC26A4 in the three families, two of which were novel. Two families had a novel pathogenic homozygous splice-site accepter variant (c.165-1G>C), while the third family had compound heterozygous pathogenic variants (c.1446G>A; p.Trp482* and c.304G>A; p.Gly102Arg). Our approach helped in redirecting the diagnosis of several affected members of three different families from non-syndromic HL to syndromic HL. Two of the affected individuals had typical PDS, one had DFNB4, while the rest had atypical PDS. Our work emphasized the intra- and inter-familial variability of SLC26A4-related phenotypes. In addition, we highlighted the variable phenotypic impact of SLC26A4 on tailoring a personalized healthcare management.
Collapse
Affiliation(s)
- Mohamed Tawalbeh
- Department of Special Surgery, Jordan University Hospital, Amman 11942, Jordan
- Correspondence: (M.T.); (B.A.)
| | - Dunia Aburizeg
- Department of Pathology and Microbiology and Forensic Medicine, School of Medicine, The University of Jordan, Amman 11942, Jordan
| | - Bayan O. Abu Alragheb
- Department of Pathology and Microbiology and Forensic Medicine, School of Medicine, The University of Jordan, Amman 11942, Jordan
| | - Wala Sami Alaqrabawi
- Hearing and Speech Department, School of Rehabilitation Sciences, The University of Jordan, Amman 11942, Jordan
- Audiology Department, Faculty of Medical Sciences, Hacettepe University, Ankara 06100, Turkey
| | - Zain Dardas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Luma Srour
- Department of Pathology and Microbiology and Forensic Medicine, School of Medicine, The University of Jordan, Amman 11942, Jordan
| | | | - Ayman A. Zayed
- Division of Endocrinology, Diabetes & Metabolism, Department of Internal Medicine, Jordan University Hospital, Amman 11942, Jordan
| | - Zaid El Omari
- Otolaryngology, Head and Neck Surgery Department, Jordanian Royal Medical Services, Amman 11855, Jordan
| | - Bilal Azab
- Department of Pathology and Microbiology and Forensic Medicine, School of Medicine, The University of Jordan, Amman 11942, Jordan
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, NY 10032, USA
- Correspondence: (M.T.); (B.A.)
| |
Collapse
|
3
|
Rapid Genetic Diagnosis for Okinawan Patients with Enlarged Vestibular Aqueduct Using Single-Stranded Tag Hybridization Chromatographic Printed-Array Strip. J Clin Med 2022; 11:jcm11041099. [PMID: 35207372 PMCID: PMC8880462 DOI: 10.3390/jcm11041099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/11/2022] [Accepted: 02/17/2022] [Indexed: 02/04/2023] Open
Abstract
Both Pendred syndrome (PS) and nonsyndromic hearing loss with an enlarged vestibular aqueduct (EVA) are autosomal recessive disorders caused by SLC26A4 pathogenic variants. The spectrum of SLC26A4 pathogenic variants varies with the ethnic background. Among the patients with EVA in Okinawa, 94% had some combination of NM_000441.2(SLC26A4):c.1707+5G>A and NM_000441.2(SLC26A4):c.2168A>G(p.His723Arg), the two SLC26A4 pathogenic variants that are the most common in this population. We identified these two pathogenic variants using a novel genotyping method that employed an allele-specific polymerase chain reaction (PCR) from a gDNA and single-stranded tag hybridization chromatographic printed-array strip (STH-PAS) in DNA samples obtained from 48 samples in Okinawa, including 34 patients with EVA and 14 carriers of c.1707+5G>A or c.2168A>G. In addition, whole blood and saliva samples were used for analysis in this genotyping method with direct PCR. The results of STH-PAS genotyping were consistent with those obtained using standard Sanger sequencing for all samples. The accuracy of the STH-PAS method is 100% under the optimized conditions. STH-PAS genotyping provided a diagnosis in 30 out of 34 patients (88%) in Okinawan patients with EVA in under 3 h. The turn-around time for STH-PAS genotyping used with direct PCR was 2 h as a result of the omission of the DNA extraction and purification steps. Using information about the ethnic distribution of pathogenic variants in the SLC26A4 gene, STH-PAS genotyping performs a rapid genetic diagnosis that is simple and has a considerably improved efficiency.
Collapse
|
4
|
Honda K, Griffith AJ. Genetic architecture and phenotypic landscape of SLC26A4-related hearing loss. Hum Genet 2021; 141:455-464. [PMID: 34345941 DOI: 10.1007/s00439-021-02311-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 06/29/2021] [Indexed: 12/15/2022]
Abstract
Mutations of coding regions and splice sites of SLC26A4 cause Pendred syndrome and nonsyndromic recessive hearing loss DFNB4. SLC26A4 encodes pendrin, a transmembrane exchanger of anions and bases. The mutant SLC26A4 phenotype is characterized by inner ear malformations, including an enlarged vestibular aqueduct (EVA), incomplete cochlear partition type II and modiolar hypoplasia, progressive and fluctuating hearing loss, and vestibular dysfunction. A thyroid iodine organification defect can lead to multinodular goiter and distinguishes Pendred syndrome from DFNB4. Pendred syndrome and DFNB4 are each inherited as an autosomal recessive trait caused by biallelic mutations of SLC26A4 (M2). However, there are some EVA patients with only one detectable mutant allele (M1) of SLC26A4. In most European-Caucasian M1 patients, there is a haplotype that consists of 12 variants upstream of SLC26A4, called CEVA (Caucasian EVA), which acts as a pathogenic recessive allele in trans to mutations affecting the coding regions or splice sites of SLC26A4. This combination of an M1 genotype with the CEVA haplotype is associated with a less severe phenotype than the M2 genotype. The phenotype in EVA patients with no mutant alleles of SLC26A4 (M0) has a very low recurrence probability and is likely to be caused by other factors.
Collapse
Affiliation(s)
- Keiji Honda
- Department of Otorhinolaryngology, Tokyo Medical and Dental University (TMDU), Bunkyo-ku, Tokyo, Japan
| | - Andrew J Griffith
- Department of Otolaryngology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA.
| |
Collapse
|
5
|
Forli F, Lazzerini F, Auletta G, Bruschini L, Berrettini S. Enlarged vestibular aqueduct and Mondini Malformation: audiological, clinical, radiologic and genetic features. Eur Arch Otorhinolaryngol 2020; 278:2305-2312. [PMID: 32910226 PMCID: PMC8165072 DOI: 10.1007/s00405-020-06333-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 08/28/2020] [Indexed: 11/29/2022]
Abstract
PURPOSE When referring to enlarged vestibular aqueduct (EVA) we should differentiate between nonsyndromic enlarged vestibular aqueduct (NSEVA) and Pendred Syndrome (PDS), a disease continuum associated with pathogenic sequence variants of Pendrin's Gene (SLC26A4) in about half of the cases. The study was aimed to analyse the clinical and audiological features of a monocentric cohort of Caucasian patients with NSEVA/PDS, their genetic assessment and morphological inner ear features. METHODS We retrospectively reviewed the audiologic, genetic and anamnestic data of 66 patients with NSEVA/PDS followed by our audiology service. RESULTS SLC26A4 mutations was significantly correlated with the presence of PDS rather than NSEVA (p < 0.019), with the expression of inner ear malformations (p < 0.001) and with different severity of hearing loss (p = 0.001). Furthermore, patients with PDS showed significantly worse pure tone audiometry (PTA) than patients with NSEVA (p = 0.001). Anatomically normal ears presented significantly better PTA than ears associated with Mondini Malformation or isolated EVA (p < 0.001), but no statistically significative differences have been observed in PTA between patients with Mondini Malformation and isolated EVA. CONCLUSION NSEVA/PDS must be investigated in all the congenital hearing loss, but also in progressive, late onset, stepwise forms. Even mixed or fluctuating hearing loss may constitute a sign of a NSEVA/PDS pathology. Our findings can confirm the important role of SLC26A4 mutations in determining the phenotype of isolated EVA/PDS, both for the type/degree of the malformation, the hearing impairment and the association with thyroid dysfunction.
Collapse
Affiliation(s)
- F Forli
- Otolaryngology, Audiology and Phoniatrics Unit, University of Pisa, Pisa, Italy.
| | - F Lazzerini
- Otolaryngology, Audiology and Phoniatrics Unit, University of Pisa, Pisa, Italy
| | - G Auletta
- UOC Audiologia, DAI Testa Collo, AOU Federico II, Naples, Italy
| | - L Bruschini
- Otolaryngology, Audiology and Phoniatrics Unit, University of Pisa, Pisa, Italy
| | - S Berrettini
- Otolaryngology, Audiology and Phoniatrics Unit, University of Pisa, Pisa, Italy.,Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
6
|
Ibrahim O, Sutherland HG, Maksemous N, Smith R, Haupt LM, Griffiths LR. Exploring Neuronal Vulnerability to Head Trauma Using a Whole Exome Approach. J Neurotrauma 2020; 37:1870-1879. [PMID: 32233732 PMCID: PMC7462038 DOI: 10.1089/neu.2019.6962] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Brain injuries are associated with oxidative stress and a need to restore neuronal homeostasis. Mutations in ion channel genes, in particular CACNA1A, have been implicated in familial hemiplegic migraine (FHM) and in the development of concussion-related symptoms in response to trivial head trauma. The aim of this study was to explore the potential role of variants in other ion channel genes in the development of such responses. We conducted whole exome sequencing (WES) on16 individuals who developed a range of neurological and concussion-related symptoms following minor or trivial head injuries. All individuals were initially tested and shown to be negative for mutations in known FHM genes. Variants identified from the WES results were filtered to identify rare variants (minor allele frequency [MAF] <0.01) in genes related to neural processes as well as genes highly expressed in the brain using a combination of in silico prediction tools (SIFT, PolyPhen, PredictSNP, Mutation Taster, and Mutation Assessor). Rare (MAF <0.001) or novel heterozygous variants in 7 ion channel genes were identified in 37.5% (6/16) of the cases (CACNA1I, CACNA1C, ATP10A, ATP7B, KCNAB1, KCNJ10, and SLC26A4), rare variants in neurotransmitter genes were found in 2 cases (GABRG1 and GRIK1), and rare variants in 3 ubiquitin-related genes identified in 4 cases (SQSTM1, TRIM2, and HECTD1). In this study, the largest proportion of potentially pathogenic variants in individuals with severe responses to minor head trauma were identified in genes previously implicated in migraine and seizure-related autosomal recessive neurological disorders. Together with results implicating variants in the hemiplegic migraine genes, CACNA1A and ATP1A2, in severe head trauma response, our results support a role for heterozygous deleterious mutations in genes implicated in neurological dysfunction and potentially increasing the risk of poor response to trivial head trauma.
Collapse
Affiliation(s)
- Omar Ibrahim
- Genomics Research Centre, Institute of Health and Biomedical Innovation, School of Biomedical Science, Queensland University of Technology (QUT), Kelvin Grove, Queensland, Australia
| | - Heidi G Sutherland
- Genomics Research Centre, Institute of Health and Biomedical Innovation, School of Biomedical Science, Queensland University of Technology (QUT), Kelvin Grove, Queensland, Australia
| | - Neven Maksemous
- Genomics Research Centre, Institute of Health and Biomedical Innovation, School of Biomedical Science, Queensland University of Technology (QUT), Kelvin Grove, Queensland, Australia
| | - Robert Smith
- Genomics Research Centre, Institute of Health and Biomedical Innovation, School of Biomedical Science, Queensland University of Technology (QUT), Kelvin Grove, Queensland, Australia
| | - Larisa M Haupt
- Genomics Research Centre, Institute of Health and Biomedical Innovation, School of Biomedical Science, Queensland University of Technology (QUT), Kelvin Grove, Queensland, Australia
| | - Lyn R Griffiths
- Genomics Research Centre, Institute of Health and Biomedical Innovation, School of Biomedical Science, Queensland University of Technology (QUT), Kelvin Grove, Queensland, Australia
| |
Collapse
|
7
|
Genetic Inheritance of Late-Onset, Down-Sloping Hearing Loss and Its Implications for Auditory Rehabilitation. Ear Hear 2020; 41:114-124. [DOI: 10.1097/aud.0000000000000734] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
8
|
Mey K, Muhamad AA, Tranebjaerg L, Rendtorff ND, Rasmussen SH, Bille M, Cayé-Thomasen P. Association of SLC26A4 mutations, morphology, and hearing in pendred syndrome and NSEVA. Laryngoscope 2019; 129:2574-2579. [PMID: 31633822 DOI: 10.1002/lary.27319] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 04/07/2018] [Accepted: 05/03/2018] [Indexed: 12/19/2022]
Abstract
OBJECTIVE To investigate the relations of monoallelic (M1), biallelic (M2), or the absence of mutations (M0) in SLC26A4 to inner ear morphology and hearing levels in individuals with Pendred syndrome (PS) or nonsyndromic enlarged vestibular aqueduct (NSEVA) associated with hearing loss. METHODS In a cohort of 139 PS/NSEVA individuals, 115 persons from 95 unrelated families had full genetic sequencing of SLC26A4, and 113 had retrievable images for re-assessment of inner ear morphology. The association between the number of mutant alleles in SLC26A4, inner ear morphology (including endolymphatic sac size and protein content on magnetic resonance imaging), and hearing level (pure tone average) was explored. RESULTS Biallelic SLC26A4 mutations (M2) occurred in three-quarters of the cohort and was invariably associated with poor hearing; in 87%, it was associated with incomplete partition type II of the cochlea as well as enlarged endolymphatic sac and vestibular aqueduct. M1 or M0 individuals exhibited a greater variability in inner ear morphology. Endolymphatic sac size and presence of "high-protein" sac contents were significantly higher in M2 individuals compared to M1 and M0 individuals. CONCLUSION The number of SLC26A4 mutations is associated with severity and variability of inner ear morphology and hearing level in individuals with PS or NSEVA. M2 individuals have poorer hearing and present largely incomplete partition type II of the cochleas with enlarged endolymphatic sacs, whereas individuals with M1 and no detectable SLC26A4 mutations have less severe hearing loss and more diverse inner ear morphology. LEVEL OF EVIDENCE 4. Laryngoscope, 129:2574-2579, 2019.
Collapse
Affiliation(s)
- Kristianna Mey
- Department of Otorhinolaryngology, Head and Neck Surgery and Audiology Rigshospitalet/Gentofte, Hellerup
| | | | - Lisbeth Tranebjaerg
- the Department of Clinical Genetics, Rigshospitalet/The Kennedy Center.,the Institute of Clinical Medicine
| | - Nanna D Rendtorff
- the Department of Clinical Genetics, Rigshospitalet/The Kennedy Center
| | | | - Michael Bille
- Department of Otorhinolaryngology, Head and Neck Surgery and Audiology Rigshospitalet/Gentofte, Hellerup
| | - Per Cayé-Thomasen
- Department of Otorhinolaryngology, Head and Neck Surgery and Audiology Rigshospitalet/Gentofte, Hellerup.,Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
9
|
Nonose RW, Lezirovitz K, de Mello Auricchio MTB, Batissoco AC, Yamamoto GL, Mingroni-Netto RC. Mutation analysis of SLC26A4 (Pendrin) gene in a Brazilian sample of hearing-impaired subjects. BMC MEDICAL GENETICS 2018; 19:73. [PMID: 29739340 PMCID: PMC5941635 DOI: 10.1186/s12881-018-0585-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Accepted: 04/19/2018] [Indexed: 12/18/2022]
Abstract
Background Mutations in the SLC26A4 gene are associated with Pendred syndrome and autosomal recessive non-syndromic deafness (DFNB4). Both disorders have similar audiologic characteristics: bilateral hearing loss, often severe or profound, which may be associated with abnormalities of the inner ear, such as dilatation of the vestibular aqueduct or Mondini dysplasia. But, in Pendred syndrome (OMIM #274600), with autosomal recessive inheritance, besides congenital sensorineural deafness, goiter or thyroid dysfunctions are frequently present. The aim of this study was to determine whether mutations in SLC26A4 are a frequent cause of hereditary deafness in Brazilian patients. Methods Microsatellite haplotypes linked to SLC26A4 were investigated in 68 families presenting autosomal recessive non-syndromic deafness. In the probands of the 16 families presenting segregation consistent with linkage to SLC26A4, Sanger sequencing of the 20 coding exons was performed. In an additional sample of 15 individuals with suspected Pendred syndrome, because of the presence of hypothyroidism or cochleovestibular malformations, the SLC26A4 gene coding region was also sequenced. Results In two of the 16 families with indication of linkage to SLC26A4, the probands were found to be compound heterozygotes for probably pathogenic different mutations: three novel (c.1003 T > G (p. F335 V), c.1553G > A (p.W518X), c.2235 + 2 T > C (IVS19 + 2 T > C), and one already described, c.84C > A (p.S28R). Two of the 15 individuals with suspected Pendred syndrome because of hypothyreoidism or cochleovestibular malformations were monoallelic for likely pathogenic mutations: a splice mutation (IVS7 + 2 T > C) and the previously described c.1246A > C (p.T416P). Pathogenic copy number variations were excluded in the monoallelic cases and in those with normal results after Sanger sequencing. Additional mutations in the SLC26A4 gene or other definite molecular cause for deafness were not identified in the monoallelic patients, after exome sequencing. Conclusions Biallelic pathogenic mutations in SLC26A4 explained ~ 3% of cases selected because of autosomal recessive deafness. Monoallelic mutations were present in ~ 13% of isolated cases of deafness with cochleovestibular malformations or suspected Pendred syndrome. These data reinforce the importance of mutation screening of SLC26A4 in Brazilian subjects and highlight the elevated frequency of monoallelic patients.
Collapse
Affiliation(s)
- Renata Watanabe Nonose
- Centro de Pesquisas sobre o Genoma Humano e Células-Tronco, Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Karina Lezirovitz
- Centro de Pesquisas sobre o Genoma Humano e Células-Tronco, Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil.,Laboratório de Investigação Médica/LIM32 do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Maria Teresa Balester de Mello Auricchio
- Centro de Pesquisas sobre o Genoma Humano e Células-Tronco, Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Ana Carla Batissoco
- Centro de Pesquisas sobre o Genoma Humano e Células-Tronco, Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Guilherme Lopes Yamamoto
- Centro de Pesquisas sobre o Genoma Humano e Células-Tronco, Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Regina Célia Mingroni-Netto
- Centro de Pesquisas sobre o Genoma Humano e Células-Tronco, Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil.
| |
Collapse
|
10
|
Identification of Pathogenic Genes of Nonsyndromic Hearing Loss in Uyghur Families Using Massively Parallel DNA Sequencing Technique. DISEASE MARKERS 2018; 2018:5298057. [PMID: 29692870 PMCID: PMC5859828 DOI: 10.1155/2018/5298057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 08/28/2017] [Accepted: 09/28/2017] [Indexed: 11/18/2022]
Abstract
We aim to identify the mutations of deafness genes using massively parallel DNA sequencing in the 12 Uyghur families. SNPscan method was used to screen against the 124 sites in the common deafness genes in probands. Subjects with SNPscan negativity were subject to massively parallel DNA sequencing for the sequencing of 97 genes known to be responsible for hearing loss. Eight families (66.7%) showed biallelic mutations in probands, including MYO15A mutation (6892C>T in J02 family, 9514C>T/7894G>T in J07 family, and 9514C>T in J16 family), MYO7A mutation (1258A>T in J03 family), TMC1 mutation (773G>A in J09 family and 1247T>G/1312G>A in J11 family), and PCDH15 mutation (4658delT in J08 and J13 families). Six novel types of mutation were identified including 6892C>T, 9514C>T/7894G>T, and 9514C>T in MYO15A gene, 1258A>T in MYO7A, 773G>A in TMC1, and 4658delT in PCDH15. The ratio of nonsense mutation and frameshift mutation was comparatively high. All these indicated that the mutation types reported in this study were rare. In conclusion, rare deafness genes were identified in the Uyghur families using massively parallel DNA sequencing, part of which were suggested to be related to the pathogenesis of the disease.
Collapse
|
11
|
Zhu GJ, Shi LS, Zhou H, Yang Y, Chen J, Gao X. A novel compound heterozygous mutation of SLC26A4 in two Chinese families with nonsyndromic hearing loss and enlarged vestibular aqueducts. Mol Med Rep 2017; 16:9011-9016. [PMID: 28990112 DOI: 10.3892/mmr.2017.7690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 08/10/2017] [Indexed: 11/06/2022] Open
Abstract
Enlarged vestibular aqueduct (EVA)‑associated hearing loss is frequently detected in individuals carrying the SLC26A4 mutation in the Chinese population. The present study aimed to identify the causative SLC26A4 coding mutations in a patient group with nonsyndromic hearing loss (NSHL) and EVA. Genomic DNA was extracted from blood samples obtained from 52 NSHL patients with EVA and from 60 normal controls. The mutation analysis for 20 coding exons of SLC26A4 was performed by direct sequencing. The results of the mutational analysis showed that there were two probands from two separate families suffering from bilateral sensorineural hearing loss with EVA, carrying the same novel compound heterozygous mutation of SLC26A4 (c.1644_1645insA and c.2168A>G). Other members of the two families had heterozygous mono‑allelic mutations with normal hearing. However, neither of these mutations were detected in the 60 normal controls. These results are the first, to the best of our knowledge, to link the compound heterozygote mutation, c.1644_1645insA and c.2168A>G, in the SLC26A4 gene to NSHL patients with EVA. The two mutations identified in the present study were located in the anti‑sigma factor antagonist domain, the core region for plasma membrane targeting of anion transporters, which suggested that the reduced or complete loss of SLC26A4 function was the direct cause of hearing loss in the two patients. These results provide a foundation for further elucidating the genetic factors responsible for EVA‑associated NSHL.
Collapse
Affiliation(s)
- Guang-Jie Zhu
- Department of Otorhinolaryngology, Head and Neck Surgery, Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu 210008, P.R. China
| | - Lu-Sen Shi
- Department of Otorhinolaryngology, Head and Neck Surgery, Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu 210008, P.R. China
| | - Han Zhou
- Department of Otorhinolaryngology, Head and Neck Surgery, Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu 210008, P.R. China
| | - Ye Yang
- Department of Otorhinolaryngology, Head and Neck Surgery, Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu 210008, P.R. China
| | - Jie Chen
- Department of Otorhinolaryngology, Head and Neck Surgery, Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu 210008, P.R. China
| | - Xia Gao
- Department of Otorhinolaryngology, Head and Neck Surgery, Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu 210008, P.R. China
| |
Collapse
|
12
|
Lin PH, Hsu CJ, Lin YH, Lin YH, Lee HY, Wu CC, Liu TC. Etiologic and Audiologic Characteristics of Patients With Pediatric-Onset Unilateral and Asymmetric Sensorineural Hearing Loss. JAMA Otolaryngol Head Neck Surg 2017; 143:912-919. [PMID: 28687817 DOI: 10.1001/jamaoto.2017.0945] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Importance Pediatric-onset unilateral and asymmetric sensorineural hearing loss (SNHL) is a common condition, but in most patients, the cause remains unclear; thus, determination of the hearing outlook is difficult. Objective To analyze the etiologic and audiologic characteristics of pediatric-onset unilateral and asymmetric SNHL. Design, Setting, and Participants In this retrospective cohort study performed from January 1, 2008, through December 31, 2016, patients at a tertiary referral center who were diagnosed with pediatric-onset unilateral or asymmetric SNHL were divided into 3 groups according to their hearing levels: unilateral hearing loss with scaled-out levels (UHL-SO), unilateral hearing loss with residual hearing (UHL-RH), and asymmetric hearing loss (AHL). Main Outcomes and Measures Basic demographic data, family and medical histories, audiologic results, imaging findings, and genetic results were ascertained and compared among patients of the 3 groups. Results A total of 133 patients (mean [SD] age, 9.1 [10.9] years; 63 [47.4%] male and 70 [52.6%] female), including 50 with UHL-SO, 42 with UHL-RH, and 41 with AHL, were enrolled for analyses. Of 50 patients with UHL-SO, 49 (98.0%) had stable hearing levels with time, whereas 10 of 42 patients with UHL-RH (23.8%) and 18 of 41 patients with AHL (43.9%) revealed progressive or fluctuating hearing loss. Inner ear malformations detected with temporal bone high-resolution computed tomography, particularly cochlear aperture stenosis, were detected at higher rates in patients with UHL-SO (9 of 31 [29.0%]) and UHL-RH (6 of 24 [25.0%]) than in those with AHL (1 of 30 [3.3%]). In contrast, screening for mutations in 3 common deafness genes-GJB2, SLC26A4, and MTRNR1-achieved definite diagnosis in a higher percentage of patients with AHL (10 of 37 [27.0%]) than patients with UHL-SO (0 of 33) and UHL-RH (1 of 25 [4.0%]). Conclusions and Relevance The UHL-SO and UHL-RH conditions share a common or similar etiopathogenesis different from that of AHL. Imaging studies and genetic testing might be prioritized during the respective general etiologic workups for patients with UHL and AHL. Regular hearing checkups are warranted for patients with UHL and AHL because a certain proportion of patients might sustain progression in SNHL.
Collapse
Affiliation(s)
- Pei-Hsuan Lin
- Department of Otolaryngology, National Taiwan University Hospital Yunlin Branch, Yunlin, Taiwan
| | - Chuan-Jen Hsu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.,Department of Otolaryngology, Taichung Tzu-Chi Hospital, Taichung, Taiwan
| | - Yi-Hsin Lin
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.,Graduate Institute of Molecular Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Yin-Hung Lin
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.,Graduate Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Hui-Yu Lee
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - Chen-Chi Wu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.,Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Tien-Chen Liu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| |
Collapse
|
13
|
Mapping pathogenic mutations suggests an innovative structural model for the pendrin (SLC26A4) transmembrane domain. Biochimie 2016; 132:109-120. [PMID: 27771369 DOI: 10.1016/j.biochi.2016.10.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 10/03/2016] [Indexed: 12/16/2022]
Abstract
Human pendrin (SLC26A4) is an anion transporter mostly expressed in the inner ear, thyroid and kidney. SLC26A4 gene mutations are associated with a broad phenotypic spectrum, including Pendred Syndrome and non-syndromic hearing loss with enlarged vestibular aqueduct (ns-EVA). No experimental structure of pendrin is currently available, making phenotype-genotype correlations difficult as predictions of transmembrane (TM) segments vary in number. Here, we propose a novel three-dimensional (3D) pendrin transmembrane domain model based on the SLC26Dg transporter. The resulting 14 TM topology was found to include two non-canonical transmembrane segments crucial for pendrin activity. Mutation mapping of 147 clinically validated pathological mutations shows that most affect two previously undescribed TM regions.
Collapse
|
14
|
Genetics of vestibular disorders: pathophysiological insights. J Neurol 2016; 263 Suppl 1:S45-53. [PMID: 27083884 PMCID: PMC4833787 DOI: 10.1007/s00415-015-7988-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 11/01/2015] [Accepted: 11/29/2015] [Indexed: 01/09/2023]
Abstract
The two most common vestibular disorders are motion sickness and vestibular migraine, affecting 30 and 1–2 % of the population respectively. Both are related to migraine and show a familial trend. Bilateral vestibular hypofunction is a rare condition, and some of patients also present cerebellar ataxia and neuropathy. We present recent advances in the genetics of vestibular disorders with familial aggregation. The clinical heterogeneity observed in different relatives of the same families suggests a variable penetrance and the interaction of several genes in each family. Some Mendelian sensorineural hearing loss also exhibits vestibular dysfunction, including DFNA9, DFNA11, DFNA15 and DFNA28. However, the most relevant finding during the past years is the familial clustering observed in Meniere’s disease. By using whole exome sequencing and combining bioinformatics tools, novel variants in DTNA and FAM136A genes have been identified in familial Meniere’s disease, and this genomic strategy will facilitate the discovery of the genetic basis of familial vestibular disorders.
Collapse
|
15
|
The R130S mutation significantly affects the function of prestin, the outer hair cell motor protein. J Mol Med (Berl) 2016; 94:1053-62. [PMID: 27041369 DOI: 10.1007/s00109-016-1410-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 02/01/2016] [Accepted: 02/29/2016] [Indexed: 01/29/2023]
Abstract
UNLABELLED A missense mutation, R130S, was recently found in the prestin gene, SLC26A5, of patients with moderate to severe hearing loss (DFNB61). In order to define the pathology of hearing loss associated with this missense mutation, a recombinant prestin construct harboring the R130S mutation (R130S-prestin) was generated, and its functional consequences examined in a heterologous expression system. We found that R130S-prestin targets the plasma membrane but less efficiently compared to wild-type. The voltage operating point and voltage sensitivity of the motor function of R130S-prestin were similar to wild-type prestin. However, the motor activity of R130S-prestin is greatly reduced at higher voltage stimulus frequencies, indicating a reduction in motor kinetics. Our study thus provides experimental evidence that supports a causal relationship between the R130S mutation in the prestin gene and hearing loss found in patients with this missense mutation. KEY MESSAGE Membrane targeting of prestin is impaired by the R130S missense mutation. The fast motor kinetics of prestin is impaired by the R130S missense mutation. Our study strongly suggests that the prestin R130S missense mutation is pathogenic.
Collapse
|
16
|
Targeted Exome Sequencing of Deafness Genes After Failure of Auditory Phenotype-Driven Candidate Gene Screening. Otol Neurotol 2016; 36:1096-102. [PMID: 25830873 DOI: 10.1097/mao.0000000000000747] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To demonstrate the efficacy and advantages of targeted exome sequencing (TES) of known deafness genes in cases with failed or misleading auditory phenotype-driven candidate gene screening. STUDY DESIGN Prospective cohort survey. SETTING Otolaryngology department of a tertiary referral hospital. PATIENTS Six hearing-impaired probands with seemingly non-syndromic features from six deaf families were enrolled in this study after failure of genetic diagnosis using auditory phenotype-driven candidate gene screening. INTERVENTION TES of known deafness genes was performed in the six probands, and a final causative variant was pursued using subsequent filtering steps. MAIN OUTCOME MEASURE Potential causative variants determined using TES were confirmed by previously introduced filtering steps. RESULTS We detected causative variants in three (50%) of six families, and these variants were in the COCH, PAX3, and GJB2 genes. Additionally, we also recapitulated the recent finding from other report arguing for the non-pathogenic potential of MYO1A variant. CONCLUSIONS TES of a deafness panel provides a comprehensive genetic screening tool that can be implemented without being misled by the audiogram configuration information and can complement incomplete clinical physical examinations. In addition, the secondary incidental finding obtained by TES contributes useful information regarding the deafness field.
Collapse
|
17
|
Rah YC, Kim AR, Koo JW, Lee JH, Oh SH, Choi BY. Audiologic presentation of enlargement of the vestibular aqueduct according to theSLC26A4genotypes. Laryngoscope 2014; 125:E216-22. [DOI: 10.1002/lary.25079] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/10/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Yoon C. Rah
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul National University College of Medicine; Seoul
| | - Ah R. Kim
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul National University College of Medicine; Seoul
| | - Ja-Won Koo
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Bundang Hospital, Seoul National University College of Medicine; Seongnam Republic of Korea
| | - Jun H. Lee
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul National University College of Medicine; Seoul
| | - Seung-ha Oh
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul National University College of Medicine; Seoul
| | - Byung Y. Choi
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Bundang Hospital, Seoul National University College of Medicine; Seongnam Republic of Korea
| |
Collapse
|
18
|
Okamoto Y, Mutai H, Nakano A, Arimoto Y, Sugiuchi T, Masuda S, Morimoto N, Sakamoto H, Ogahara N, Takagi A, Taiji H, Kaga K, Ogawa K, Matsunaga T. Subgroups of enlarged vestibular aqueduct in relation toSLC26A4mutations and hearing loss. Laryngoscope 2013; 124:E134-40. [DOI: 10.1002/lary.24368] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 06/27/2013] [Accepted: 06/27/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Yasuhide Okamoto
- Department of Otolaryngology; National Hospital Organization Tokyo Medical Center; Tokyo Japan
- Department of Otorhinolaryngology; Inagi Municipal Hospital; Tokyo Japan
- Department of Otolaryngology; Keio University Hospital; Tokyo Japan
| | - Hideki Mutai
- Department of Otolaryngology; National Hospital Organization Tokyo Medical Center; Tokyo Japan
| | - Atsuko Nakano
- Division of Otorhinolaryngology; Chiba Children's Hospital; Chiba Japan
| | - Yukiko Arimoto
- Division of Otorhinolaryngology; Chiba Children's Hospital; Chiba Japan
| | - Tomoko Sugiuchi
- Department of Otolaryngology; Kanto Rosai Hospital; Kanagawa Japan
| | - Sawako Masuda
- Department of Otorhinolaryngology; National Mie Hospital; Mie Japan
| | - Noriko Morimoto
- Department of Otorhinolaryngology; National Center for Children and Development; Tokyo Japan
| | - Hirokazu Sakamoto
- Department of Otorhinolaryngology; Kobe Children's Hospital; Hyogo Japan
| | - Noboru Ogahara
- Department of Otorhinolaryngology; Kanagawa Children's Medical Center; Kanagawa Japan
| | - Akira Takagi
- Department of Otorhinolaryngology; Shizuoka General Hospital Shizuoka Japan
| | - Hidenobu Taiji
- Department of Otorhinolaryngology; National Center for Children and Development; Tokyo Japan
| | - Kimitaka Kaga
- Department of Otolaryngology; National Hospital Organization Tokyo Medical Center; Tokyo Japan
| | - Kaoru Ogawa
- Department of Otolaryngology; Keio University Hospital; Tokyo Japan
| | - Tatsuo Matsunaga
- Department of Otolaryngology; National Hospital Organization Tokyo Medical Center; Tokyo Japan
| |
Collapse
|
19
|
Ko HC, Liu TC, Lee LA, Chao WC, Tsou YT, Ng SH, Wu CM. Timing of surgical intervention with cochlear implant in patients with large vestibular aqueduct syndrome. PLoS One 2013; 8:e81568. [PMID: 24282608 PMCID: PMC3839901 DOI: 10.1371/journal.pone.0081568] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 10/15/2013] [Indexed: 11/21/2022] Open
Abstract
Objectives (1) To report the speech perception and intelligibility results of Mandarin-speaking patients with large vestibular aqueduct syndrome (LVAS) after cochlear implantation (CI); (2) to compare their performance with a group of CI users without LVAS; (3) to understand the effects of age at implantation and duration of implant use on the CI outcomes. The obtained data may be used to guide decisions about CI candidacy and surgical timing. Methods Forty-two patients with LVAS participating in this study were divided into two groups: the early group received CI before 5 years of age and the late group after 5. Open-set speech perception tests (on Mandarin tones, words and sentences) were administered one year after implantation and at the most recent follow-up visit. Categories of auditory perception (CAP) and Speech Intelligibility Rating (SIR) scale scores were also obtained. Results The patients with LVAS with more than 5 years of implant use (18 cases) achieved a mean score higher than 80% on the most recent speech perception tests and reached the highest level on the CAP/SIR scales. The early group developed speech perception and intelligibility steadily over time, while the late group had a rapid improvement during the first year after implantation. The two groups, regardless of their age at implantation, reached a similar performance level at the most recent follow-up visit. Conclusion High levels of speech performance are reached after 5 years of implant use in patients with LVAS. These patients do not necessarily need to wait until their hearing thresholds are higher than 90 dB HL or PB word score lower than 40% to receive CI. They can do it “earlier” when their speech perception and/or speech intelligibility do not reach the performance level suggested in this study.
Collapse
Affiliation(s)
- Hui-Chen Ko
- Department of Otolaryngology, Chang-Gung Memorial Hospital, College of Medicine, Chang-Gung University, Linkou, Taiwan
| | - Tien-Chen Liu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - Li-Ang Lee
- Department of Otolaryngology, Chang-Gung Memorial Hospital, College of Medicine, Chang-Gung University, Linkou, Taiwan
| | - Wei-Chieh Chao
- Department of Otolaryngology, Chang-Gung Memorial Hospital, College of Medicine, Chang-Gung University, Linkou, Taiwan
| | - Yung-Ting Tsou
- Department of Otolaryngology, Chang-Gung Memorial Hospital, College of Medicine, Chang-Gung University, Linkou, Taiwan
| | - Shu-Hang Ng
- Molecular Imaging Center and Departments of Diagnostic Radiology and Medical Imaging, Chang-Gung University, Linkou, Taiwan
- Radiological Sciences, Chang-Gung University, Linkou, Taiwan
| | - Che-Ming Wu
- Department of Otolaryngology, Chang-Gung Memorial Hospital, College of Medicine, Chang-Gung University, Linkou, Taiwan
- * E-mail:
| |
Collapse
|
20
|
Lee H, Jung J, Shin J, Song M, Kim S, Lee JH, Lee KA, Shin S, Kim UK, Bok J, Lee KY, Choi J, Park H. Correlation between genotype and phenotype in patients with bi-allelicSLC26A4mutations. Clin Genet 2013; 86:270-5. [DOI: 10.1111/cge.12273] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 09/03/2013] [Accepted: 09/03/2013] [Indexed: 11/27/2022]
Affiliation(s)
- H.J. Lee
- Department of Otorhinolaryngology
- BK21 Project for Medical Science
| | - J. Jung
- Department of Pharmacology; Yonsei University College of Medicine; Seoul Republic of Korea
- BK21 Project for Medical Science
| | - J.W. Shin
- Department of Otorhinolaryngology
- Soree Ear Clinics; Seoul Republic of Korea
| | | | - S.H. Kim
- Department of Otorhinolaryngology
| | - J.-H. Lee
- Department of Pharmacology; Yonsei University College of Medicine; Seoul Republic of Korea
| | - K.-A. Lee
- Department of Laboratory Medicine; Yonsei University College of Medicine; Seoul Republic of Korea
| | - S. Shin
- Department of Laboratory Medicine; Yonsei University College of Medicine; Seoul Republic of Korea
| | - U.-K. Kim
- Department of Biology, College of Natural Sciences; Kyungpook National University; Daegu Republic of Korea
| | - J. Bok
- Department of Anatomy; Yonsei University College of Medicine; Seoul Republic of Korea
| | - K.-Y. Lee
- Department of Otorhinolaryngology; Kyungpook National University; Daegu Republic of Korea
| | - J.Y. Choi
- Department of Otorhinolaryngology
- BK21 Project for Medical Science
| | - H.J. Park
- Soree Ear Clinics; Seoul Republic of Korea
| |
Collapse
|
21
|
Huang CJ, Lei TH, Chang WL, Tu TY, Shiao AS, Chiu CY, Jap TS. A Novel mutation in the SLC26A4 gene in a Chinese family with Pendred syndrome. Int J Pediatr Otorhinolaryngol 2013; 77:1495-9. [PMID: 23838540 DOI: 10.1016/j.ijporl.2013.06.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 06/15/2013] [Accepted: 06/18/2013] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To investigate the mutations in the SLC26A4 gene in a Chinese patient with Pendred syndrome. METHODS The diagnosis of Pendred syndrome was confirmed by the family history, pure tone audiogram, perchlorate discharge test (PDT), and computed tomography (CT) of the temporal bone. DNA extraction, PCR and DNA sequencing were performed according to standard procedures. Mutations in the SLC26A4 gene were compared with 100 unrelated subjects to exclude common polymorphism. Splice-site mutation was further confirmed by restriction enzyme length polymorphism (RFLP) with the specifically designed primers. RESULTS The proband presented with typical features of bilateral sensorineural deafness since childhood and goiter development in the early adulthood. Thyroid studies disclosed euthyroidism with elevated thyroglobulin, but negative for PDT. Marked enlargement of bilateral vestibular aqueduct (>1.5 mm) was found by CT of the temporal bone. A novel SLC26A4 splice-site mutation c.1263+1G>A (IVS10+1G>A) was identified in compound heterozygosity with the missense mutation c.1079C>T (p.A360V) in the proband. Both mutations were not found in the 100 unrelated Chinese. CONCLUSIONS Our results support previous findings that Pendred syndrome can be caused by compound heterozygous mutation in the SLC26A4 gene, in which IVS10+1G>A is a novel pathogenic mutation.
Collapse
MESH Headings
- Asian People/genetics
- Case-Control Studies
- China
- DNA Mutational Analysis
- Female
- Genetic Predisposition to Disease
- Goiter, Nodular/diagnosis
- Goiter, Nodular/ethnology
- Goiter, Nodular/genetics
- Hearing Loss, Sensorineural/diagnosis
- Hearing Loss, Sensorineural/ethnology
- Hearing Loss, Sensorineural/genetics
- Heterozygote
- Humans
- Male
- Membrane Transport Proteins/genetics
- Mutation, Missense/genetics
- Pedigree
- Perchlorates
- Polymorphism, Genetic
- Polymorphism, Restriction Fragment Length
- Reference Values
- Sequence Analysis, DNA
- Sulfate Transporters
- Tomography, X-Ray Computed
Collapse
Affiliation(s)
- Chun-Jui Huang
- Division of Endocrinology & Metabolism, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
| | | | | | | | | | | | | |
Collapse
|
22
|
Ganaha A, Kaname T, Yanagi K, Naritomi K, Tono T, Usami SI, Suzuki M. Pathogenic substitution of IVS15 + 5G > A in SLC26A4 in patients of Okinawa Islands with enlarged vestibular aqueduct syndrome or Pendred syndrome. BMC MEDICAL GENETICS 2013; 14:56. [PMID: 23705809 PMCID: PMC3664218 DOI: 10.1186/1471-2350-14-56] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Accepted: 05/17/2013] [Indexed: 11/24/2022]
Abstract
Background Pendred syndrome (PS) and nonsyndromic hearing loss associated with enlarged vestibular aqueduct (EVA) are caused by SLC26A4 mutations. The Okinawa Islands are the southwestern-most islands of the Japanese archipelago. And ancestral differences have been reported between people from Okinawa Island and those from the main islands of Japan. To confirm the ethnic variation of the spectrum of SLC26A4 mutations, we investigated the frequencies of SLC26A4 mutations and clinical manifestations of patients with EVA or PS living in the Okinawa Islands. Methods We examined 22 patients with EVA or PS from 21 unrelated families in Okinawa Islands. The patient’s clinical history, findings of physical and otoscopic examinations, hearing test, and computed tomography (CT) scan of the temporal bones were recorded. To detect mutations, all 21 exons and the exon–intron junctions of SLC26A4 were sequenced for all subjects. Quantitative reverse-transcription polymerase chain reaction (qRT-PCR) for SLC26A4 and calculations using the comparative CT (2−ΔΔCT) method were used to determine the pathogenicity associated with gene substitutions. Results SLC26A4 mutations were identified in 21 of the 22 patients. We found a compound heterozygous mutation for IVS15 + 5G > A/H723R in nine patients (41%), a homozygous substitution of IVS15 + 5G > A in six patients (27%), and homozygous mutation for H723R in five patients (23%). The most prevalent types of SLC26A4 alleles were IVS15 + 5G > A and H723R, which both accounted for 15/22 (68%) of the patients. There were no significant correlations between the types of SLC26A4 mutation and clinical manifestations. Based on qRT-PCR results, expression of SLC26A4 was not identified in patients with the homozygous substitution of IVS15 + 5G > A. Conclusions The substitution of IVS15 + 5G > A in SLC26A4 was the most common mutation in uniquely found in patients with PS and EVA in Okinawa Islands. This suggested that the spectrum of SLC26A4 mutation differed from main islands of Japan and other East Asian countries. The substitution of IVS15 + 5G > A leads to a loss of SLC26A expression and results in a phenotype of PS and EVA.
Collapse
Affiliation(s)
- Akira Ganaha
- Department of Otorhinolaryngology-Head and Neck Surgery, University of the Ryukyus, Okinawa, Japan.
| | | | | | | | | | | | | |
Collapse
|
23
|
Wonkam A, Noubiap JJN, Djomou F, Fieggen K, Njock R, Toure GB. Aetiology of childhood hearing loss in Cameroon (sub-Saharan Africa). Eur J Med Genet 2013; 56:20-5. [DOI: 10.1016/j.ejmg.2012.09.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 09/30/2012] [Indexed: 01/03/2023]
|
24
|
Genetic diagnosis and cochlear implantation for patients with nonsyndromic hearing loss and enlarged vestibular aqueduct. The Journal of Laryngology & Otology 2012; 126:349-55. [DOI: 10.1017/s002221511100346x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AbstractObjective:To review the genotype and cochlear implantation outcome of patients with nonsyndromic hearing loss and enlarged vestibular aqueduct.Methods:Twenty-one Chinese children with nonsyndromic hearing loss and enlarged vestibular aqueduct underwent genetic examination. A DNA microarray was used to screen for the IVS7-2A>G and H723R mutations. Any DNA samples with one or none of the two mutant alleles were sequenced to detect other mutations in the SLC26A4 and FOXI1 genes.Results:Twelve SLC26A4 mutations were detected, including three novel mutations. The most common mutations detected were IVS7-2A>G and H723R. Twelve patients received cochlear implants, and subsequently demonstrated excellent speech perception.Conclusion:Three novel mutations were detected in Chinese patients with nonsyndromic hearing loss and enlarged vestibular aqueduct. The SLC26A4 mutation spectrum in the Chinese population is similar to that in other East Asian populations. Cochlear implantation is a safe and effective treatment in patients with enlarged vestibular aqueduct.
Collapse
|
25
|
Huang S, Han D, Yuan Y, Wang G, Kang D, Zhang X, Yan X, Meng X, Dong M, Dai P. Extremely discrepant mutation spectrum of SLC26A4 between Chinese patients with isolated Mondini deformity and enlarged vestibular aqueduct. J Transl Med 2011; 9:167. [PMID: 21961810 PMCID: PMC3204245 DOI: 10.1186/1479-5876-9-167] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 09/30/2011] [Indexed: 11/16/2022] Open
Abstract
Background Mutations in SLC26A4 cause Pendred syndrome (hearing loss with goiter) or DFNB4 (non-syndromic hearing loss with inner ear malformation, such as enlarged vestibular aqueduct or Mondini deformity). The relationship between mutations in SLC26A4 and Mondini deformity without enlarged vestibular aqueduct has not been studied in any Chinese deaf population. The purpose of this study was to assess whether mutations in the SLC26A4 gene cause Mondini deformity without an enlarged vestibular aqueduct (isolated Mondini deformity) in a Chinese population. Methods In total, 144 patients with sensorineural hearing loss were included and subjected to high-resolution temporal bone CT. Among them, 28 patients with isolated Mondini dysplasia (MD group), 50 patients with enlarged vestibular aqueduct with Mondini dysplasia (EVA with MD group), 50 patients with enlarged vestibular aqueduct without Mondini dysplasia (EVA group), and 16 patients with other types of inner ear malformations (IEM group) were identified. The coding exons of SLC26A4 were analyzed in all subjects. Results DNA sequence analysis of SLC26A4 was performed in all 144 patients. In the different groups, the detection rate of the SLC26A4 mutation differed. In the isolated MD group, only one single allelic mutation in SLC26A4 was found in one patient (1/28, 3.6%). In the EVA with MD group, biallelic and monoallelic SLC26A4 mutations were identified in 46 patients (46/50, 92.0%) and three patients (3/50, 6.0%), respectively. Also, in the EVA group, biallelic and monoallelic SLC26A4 mutations were identified in 46 patients (46/50, 92.0%) and three patients (3/50, 6.0%), respectively. These percentages were identical to those in the EVA plus MD group. Only two patients carried monoallelic mutations of the SLC26A4 gene in the IEM group (2/16, 12.5%). There were significant differences in the frequency of SLC26A4 mutation among the groups (P < 0.001). The detection rate of SLC26A4 mutation in the isolated MD group was significantly lower than in the EVA group (with or without MD; P < 0.001), and there was no significant difference in the detection rate of SLC26A4 between the MD group and IEM group (P > 0.5). Conclusion Although mutations in the SLC26A4 gene were frequently found in Chinese EVA patients with and without MD, there was no evidence to show a relationship between isolated MD and the SLC26A4 gene in the Chinese population examined. Hearing impairment in patients with isolated MD may be caused by factors other than mutations in the SLC26A4 gene.
Collapse
Affiliation(s)
- Shasha Huang
- Department of Otolaryngology, PLA General Hospital, Beijing, People's Republic of China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Gopen Q, Zhou G, Whittemore K, Kenna M. Enlarged vestibular aqueduct: Review of controversial aspects. Laryngoscope 2011; 121:1971-8. [DOI: 10.1002/lary.22083] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Accepted: 05/10/2011] [Indexed: 11/07/2022]
|