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Jonard L, Brotto D, Moreno-Pelayo MA, Del Castillo I, Kremer H, Pennings R, Caria H, Fialho G, Boudewyns A, Van Camp G, Ołdak M, Oziębło D, Deggouj N, De Siati RD, Gasparini P, Girotto G, Verstreken M, Dossena S, Roesch S, Battelino S, Trebušak Podkrajšek K, Warnecke A, Lenarz T, Lesinski-Schiedat A, Mondain M, Roux AF, Denoyelle F, Loundon N, Serey Gaut M, Trevisi P, Rubinato E, Martini A, Marlin S. Genetic Evaluation of Prelingual Hearing Impairment: Recommendations of an European Network for Genetic Hearing Impairment. Audiol Res 2023; 13:341-346. [PMID: 37218840 DOI: 10.3390/audiolres13030029] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/23/2023] [Accepted: 03/03/2023] [Indexed: 05/24/2023] Open
Abstract
The cause of childhood hearing impairment (excluding infectious pathology of the middle ear) can be extrinsic (embryofoetopathy, meningitis, trauma, drug ototoxicity, noise trauma, etc [...].
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Affiliation(s)
- Laurence Jonard
- Centre de Référence «Surdités Génétiques», Fédération de Génétique, Centre de Recherche en Audiologie (CREA), Hôpital Necker-Enfants Malades, Assistance Publique Hôpitaux de Paris, 75015 Paris, France
| | - Davide Brotto
- ENT Unit, Neurosciences Department, University of Padova, 35122 Padova, Italy
| | - Miguel A Moreno-Pelayo
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto Ramón y Cajal deInvestigaciones Sani-tarias (IRYCIS), Genetics Department, University hospital Ramón y Cajal, 28034 Madrid, Spain
| | - Ignacio Del Castillo
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto Ramón y Cajal deInvestigaciones Sani-tarias (IRYCIS), Genetics Department, University hospital Ramón y Cajal, 28034 Madrid, Spain
| | - Hannie Kremer
- Department of Otorhinolaryngology and Department of Human Genetics, Hearing & Genes, Radboud University Medical Center, Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6525 XZ Nijmegen, The Netherlands
| | - Ronald Pennings
- Department of Otorhinolaryngology and Department of Human Genetics, Hearing & Genes, Radboud University Medical Center, Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6525 XZ Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6525 XZ Nijmegen, The Netherlands
| | - Helena Caria
- BioISI-Biosystems & Integrative Sciences Institute, Faculty of Sciences, University of Lisboa, 1649-004 Lisboa, Portugal
- Biomedical Sciences Department, CIIAS-School of Health, Polytechnic Institute of Setubal, 2914-503 Setubal, Portugal
| | - Graça Fialho
- BioISI-Biosystems & Integrative Sciences Institute, Faculty of Sciences, University of Lisboa, 1649-004 Lisboa, Portugal
| | - An Boudewyns
- Department of Otorhinolaryngology, Head and Neck Surgery, Antwerp University Hospital, University of Antwerp, 2000 Edegem, Belgium
| | - Guy Van Camp
- Center for Medical Genetics, University of Antwerp, 2000 Antwerp, Belgium
| | - Monika Ołdak
- Department of Genetics, Institute of Physiology and Pathology of Hearing, 02-042 Warsaw, Poland
| | - Dominika Oziębło
- Department of Genetics, Institute of Physiology and Pathology of Hearing, 02-042 Warsaw, Poland
| | - Naïma Deggouj
- ENT Department, UCLouvain, Academic Hospital Saint-Luc-Brussels, 1200 Bruxelles, Belgium
| | | | - Paolo Gasparini
- Medical Genetics, Institute for Ma-ternal and Child Health (IRCCS) "Burlo Garofolo", Department of Medical, Surgery and Health Sciences, University of Trieste, 34127 Trieste, Italy
| | - Giorgia Girotto
- Medical Genetics, Institute for Ma-ternal and Child Health (IRCCS) "Burlo Garofolo", Department of Medical, Surgery and Health Sciences, University of Trieste, 34127 Trieste, Italy
| | | | - Silvia Dossena
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, 5020 Salzburg, Austria
| | - Sebastian Roesch
- Department of Otorhinolaryngology, Head and Neck Surgery, Paracelsus Medical University, 5020 Salzburg, Austria
| | - Saba Battelino
- Department of Otorhinolaryngology and Cervicofacial Surgery, University Medical Centre Ljubljana, Medical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Katarina Trebušak Podkrajšek
- Institute of Biochemistry and Molecular Genetics, Medical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Athanasia Warnecke
- Department of Otorhinolaryngology-Head and Neck Surgery, Hannover Medical School, D-30625 Hannover, Germany
- Cluster of Excellence Hearing4all, German Research Foundation, Oldenburg 26129, Germany
| | - Thomas Lenarz
- Department of Otorhinolaryngology-Head and Neck Surgery, Hannover Medical School, D-30625 Hannover, Germany
- Cluster of Excellence Hearing4all, German Research Foundation, Oldenburg 26129, Germany
| | - Anke Lesinski-Schiedat
- Medical Head German Hearing Center, Department of Otorhinolaryngology, Medical University of Hannover, D-30625 Hannover, Germany
| | - Michel Mondain
- ENT Department, CHU Montpellier, Université de Montpellier, 34090 Montpellier, France
| | - Anne-Françoise Roux
- Laboratoire de Génétique Moléculaire, CHU de Montpellier, Université de Montpellier, 34090 Montpellier, France
| | - Françoise Denoyelle
- Service d'ORL Pédiatrique et de Chirurgie Cervico-Faciale, INSERM UMR 1120, Hôpital Necker-Enfants Malades, Assistance Publique Hôpitaux de Paris, 75015 Paris, France
| | - Natalie Loundon
- Centre de Référence «Surdités Génétiques», Fédération de Génétique, Centre de Recherche en Audiologie (CREA), Hôpital Necker-Enfants Malades, Assistance Publique Hôpitaux de Paris, 75015 Paris, France
- Service d'ORL Pédiatrique et de Chirurgie Cervico-Faciale, INSERM UMR 1120, Hôpital Necker-Enfants Malades, Assistance Publique Hôpitaux de Paris, 75015 Paris, France
| | - Margaux Serey Gaut
- Centre de Référence «Surdités Génétiques», Fédération de Génétique, Centre de Recherche en Audiologie (CREA), Hôpital Necker-Enfants Malades, Assistance Publique Hôpitaux de Paris, 75015 Paris, France
| | - Patrizia Trevisi
- ENT Unit, Neurosciences Department, University of Padova, 35122 Padova, Italy
| | - Elisa Rubinato
- Medical Genetics, Institute for Ma-ternal and Child Health (IRCCS) "Burlo Garofolo", Department of Medical, Surgery and Health Sciences, University of Trieste, 34127 Trieste, Italy
| | - Alessandro Martini
- ENT Unit, Neurosciences Department, University of Padova, 35122 Padova, Italy
| | - Sandrine Marlin
- Centre de Référence «Surdités Génétiques», Fédération de Génétique, Centre de Recherche en Audiologie (CREA), Hôpital Necker-Enfants Malades, Assistance Publique Hôpitaux de Paris, 75015 Paris, France
- Laboratory of Embryology and Genetics of Malformations, Imagine Institute, INSERM UMR 1163, Université de Paris, 75015 Paris, France
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Caroça C, de Matos TM, Ribeiro D, Lourenço V, Martins T, Campelo P, Fialho G, Silva SN, Paço J, Caria H. Genetic Basis of Nonsyndromic Sensorineural Hearing Loss in the Sub-Saharan African Island Population of São Tomé and Príncipe: The Role of the DFNB1 Locus? OMICS 2018; 20:449-55. [PMID: 27501294 DOI: 10.1089/omi.2016.0067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Hearing loss (HL) is a common condition with both genetic and environmental causes, and it greatly impacts global health. The prevalence of HL is reportedly higher in developing countries such as the Sub-Saharan African island of São Tomé and Príncipe, where the deaf community is estimated to be less than 1% of the population. We investigated the role of the DFNB1 locus (GJB2 and GJB6 genes) in the etiology of nonsyndromic sensorineural hearing loss (NSSHL) in São Tomé and Príncipe. A sample of 316 individuals, comprising 136 NSSHL patients (92 bilateral, 44 unilateral) and 180 controls, underwent a clinical and audiological examination. Sequencing of the GJB2 coding region and testing for the (GJB6-D13S1830) and del(GJB6-D13S1854) GJB6 deletions were performed. A total of 311 out of 316 individuals were successfully analyzed regarding the GJB2 and GJB6 genetic variations, respectively. The frequency of the GJB2 coding mutations in patients and controls was low. Some of those coding mutations are the most commonly found in Eurasian and Mediterranean populations and have also been identified in Portugal. None of the GJB6 deletions was present. The presence of certain coding variants in São Tomé and Príncipe suggests a non-Sub-Saharan genetic influx and supports the previously reported genetic influx from European (mainly Portuguese) ancestors. In summary, DFNB1 locus does not appear to be a major contributor to NSSHL in São Tomé and Príncipe. However, the presence of both pathogenic and likely pathogenic mutations in GJB2 suggests that GJB2-related NSSHL might still occur in this population, warranting further research on GJB2 testing in NSSHL cases.
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Affiliation(s)
- Cristina Caroça
- 1 Otolaryngology Department, Nova Medical School/Faculty of Medical Sciences , Universidade Nova de Lisboa, Lisboa, Portugal .,2 Hospital CUF Infante Santo , Otolaryngology Department, Hospital CUF Infante Santo, Lisboa, Portugal
| | - Tiago Morim de Matos
- 3 Deafness Research Group, Biomedicine and Translational Research, BioISI, Faculty of Sciences, University of Lisbon , Lisbon, Portugal
| | - Diogo Ribeiro
- 2 Hospital CUF Infante Santo , Otolaryngology Department, Hospital CUF Infante Santo, Lisboa, Portugal
| | - Vera Lourenço
- 2 Hospital CUF Infante Santo , Otolaryngology Department, Hospital CUF Infante Santo, Lisboa, Portugal
| | - Tânia Martins
- 2 Hospital CUF Infante Santo , Otolaryngology Department, Hospital CUF Infante Santo, Lisboa, Portugal
| | - Paula Campelo
- 2 Hospital CUF Infante Santo , Otolaryngology Department, Hospital CUF Infante Santo, Lisboa, Portugal
| | - Graça Fialho
- 3 Deafness Research Group, Biomedicine and Translational Research, BioISI, Faculty of Sciences, University of Lisbon , Lisbon, Portugal
| | - Susana Nunes Silva
- 4 Centre for Toxicogenomics and Human Health (ToxOmics), NOVA Medical School , Faculty of Medical Sciences, Universidade Nova de Lisboa, Lisboa, Portugal
| | - João Paço
- 1 Otolaryngology Department, Nova Medical School/Faculty of Medical Sciences , Universidade Nova de Lisboa, Lisboa, Portugal .,2 Hospital CUF Infante Santo , Otolaryngology Department, Hospital CUF Infante Santo, Lisboa, Portugal
| | - Helena Caria
- 3 Deafness Research Group, Biomedicine and Translational Research, BioISI, Faculty of Sciences, University of Lisbon , Lisbon, Portugal .,5 School of Health, Polytechnic Institute of Setubal , Setubal, Portugal
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Haider HF, Flook M, Aparicio M, Ribeiro D, Antunes M, Szczepek AJ, Hoare DJ, Fialho G, Paço JC, Caria H. Biomarkers of Presbycusis and Tinnitus in a Portuguese Older Population. Front Aging Neurosci 2017; 9:346. [PMID: 29163129 PMCID: PMC5672025 DOI: 10.3389/fnagi.2017.00346] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 10/16/2017] [Indexed: 12/28/2022] Open
Abstract
Introduction: Presbycusis or age-related hearing loss (ARHL) is a ubiquitous health problem. It is estimated that it will affect up to 1.5 billion people by 2025. In addition, tinnitus occurs in a large majority of cases with presbycusis. Glutamate metabotropic receptor 7 (GRM7) and N-acetyltransferase 2 (NAT2) are some of the genetic markers for presbycusis. Objectives: To explore patterns of hearing loss and the role of GRM7 and NAT2 as possible markers of presbycusis and tinnitus in a Portuguese population sample. Materials and Methods: Tonal and speech audiometry, tinnitus assessment, clinical interview, and DNA samples were obtained from patients aged from 55 to 75 with or without tinnitus. GRM7 analysis was performed by qPCR. Genotyping of single nucleotide polymorphisms (SNPs) in NAT2 was performed by PCR amplification followed by Sanger sequencing or by qPCR. Results: We screened samples from 78 individuals (33 men and 45 women). T allele at GRM7 gene was the most observed (60.3% T/T and 33.3% A/T). Individuals with a T/T genotype have a higher risk for ARHL and 33% lower risk for tinnitus, compared to individuals with A/A and A/T genotype, respectively. Being a slow acetylator (53%) was the most common NAT2 phenotype, more common in men (55.8%). Intermediate acetylator was the second most common phenotype (35.9%) also more frequent in men (82.6%). Noise exposed individuals and individuals with ‘high frequency’ hearing loss seem to have a higher risk for tinnitus. Our data suggests that allele AT of GRM7 can have a statistically significant influence toward the severity of tinnitus. Conclusion: For each increasing year of age the chance of HL increases by 9%. The risk for ARHL was not significantly associated with GRM7 neither NAT2. However, we cannot conclude from our data whether the presence of T allele at GRM7 increases the odds for ARHL or whether the A allele has a protective effect. Genotype A/T at GRM7 could potentially be considered a biomarker of tinnitus severity. This is the first study evaluating the effect of GRM7 and NAT2 gene in tinnitus.
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Affiliation(s)
- Haúla F Haider
- ENT Department, Hospital Cuf Infante Santo, NOVA Medical School, Lisbon, Portugal
| | - Marisa Flook
- Deafness Research Group, BTR Unit, BioISI, Faculty of Sciences, University of Lisbon (FCUL), Lisbon, Portugal
| | | | - Diogo Ribeiro
- ENT Department, Hospital Cuf Infante Santo, NOVA Medical School, Lisbon, Portugal
| | - Marilia Antunes
- Centro de Estatística e Aplicações, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
| | | | - Derek J Hoare
- NIHR Nottingham Biomedical Research Centre, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Graça Fialho
- Deafness Research Group, BTR Unit, BioISI, Faculty of Sciences, University of Lisbon (FCUL), Lisbon, Portugal
| | - João C Paço
- ENT Department, Hospital Cuf Infante Santo, NOVA Medical School, Lisbon, Portugal
| | - Helena Caria
- Deafness Research Group, BTR Unit, BioISI, Faculty of Sciences, University of Lisbon (FCUL), Lisbon, Portugal.,ESS/IPS- Biomedical Sciences Department, School of Health, Polytechnic Institute of Setubal, Setubal, Portugal
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Gonçalves A, Santos R, O’Neill A, Escada P, Fialho G, Caria H. Caratterizzazione della mutazione SLC26A4 c.918+2T>C e report di una nuova variante potenzialmente a rischio. Acta Otorhinolaryngol Ital 2016; 36:233-8. [PMID: 27214836 PMCID: PMC4977012 DOI: 10.14639/0392-100x-889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 11/28/2015] [Indexed: 12/02/2022]
Abstract
Pendred syndrome (PS) is the second most common type of autosomal recessive syndromic hearing loss (HL). It is characterised by sensorineural HL and goiter with occasional hypothyroidism. These features are generally accompanied by malformations of the inner ear, as enlarged vestibular aqueduct (EVA). In about 50% of probands, mutations in the SLC26A4 gene are the cause of the disease. Here we report the case of a Portuguese female, aged 47, presenting with severe to profound HL and hypothyroidism. Her mother and sister, both deceased, had suffered from HL and goiter. By MRI and CT, an enlarged vestibular aqueduct and endolymphatic sac were observed. Molecular study of the patient included screening for GJB2 coding mutations and GJB6 common deletions followed by screening of all SLC26A4 exons, as well as intronic regions 8 and 14. Mutation c.918+2T>C was found for the first time in homozygosity in the intronic region 7 of the SLC26A4 gene. Whilst sequencing the control samples, a novel mutation c.821C>G was found in heterozygosity in the exon 7 of SLC26A4 gene and was predicted to be damaging. This study thus led to the finding of two novel SLC26A4 genotypes and provides new insight on the phenotypic features associated with PS.
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Affiliation(s)
- A.C. Gonçalves
- BioISI - Biosystems & Integrative Sciences Institute, Faculty of Science of the University of Lisbon, Portugal, * Present address: UCL Ear Institute, London, United Kingdom
| | - R. Santos
- ENT-CHLO, HEM, ENT Service, Centro Hospitalar de Lisboa Ocidental EPE, Egas Moniz Hospital, Portugal
| | - A. O’Neill
- ENT-CHLO, HEM, ENT Service, Centro Hospitalar de Lisboa Ocidental EPE, Egas Moniz Hospital, Portugal
- FCM/UNL, Department of Anatomy, Nova Medical School, New University of Lisbon, Portugal
| | - P. Escada
- ENT-CHLO, HEM, ENT Service, Centro Hospitalar de Lisboa Ocidental EPE, Egas Moniz Hospital, Portugal
| | - G. Fialho
- BioISI - Biosystems & Integrative Sciences Institute, Faculty of Science of the University of Lisbon, Portugal, * Present address: UCL Ear Institute, London, United Kingdom
| | - H. Caria
- BioISI - Biosystems & Integrative Sciences Institute, Faculty of Science of the University of Lisbon, Portugal, * Present address: UCL Ear Institute, London, United Kingdom
- ESS/IPS, School of Health, Polytechnic Institute of Setúbal, Portugal
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Gonçalves A, Matos T, Simões-Teixeira H, Pimenta Machado M, Simão M, Dias Ó, Andrea M, Fialho G, Caria H. WFS1 and non-syndromic low-frequency sensorineural hearing loss: A novel mutation in a Portuguese case. Gene 2014; 538:288-91. [DOI: 10.1016/j.gene.2014.01.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 01/02/2014] [Accepted: 01/13/2014] [Indexed: 11/17/2022]
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O’Neill A, Gonçalves AC, Matos TD, Santos R, Escada PA, Fialho G, Caria H. Report on a Novel Mutation, p.Leu213X, in Connexin-26 Protein. Otolaryngol Head Neck Surg 2013. [DOI: 10.1177/0194599813496044a285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objectives: Nonsyndromic sensorineural hearing loss (HL) is predominantly inherited in an autosomal recessive pattern. The DFNB1 locus, at chromosome 13q11-q12, includes the GJB2 and GJB6 genes, which encode connexin-26 (Cx26) and connexin-30 (Cx30), respectively. The objective of this study was to assess the genetic etiology of HL in a Portuguese family, presenting two siblings with nonsyndromic sensorineural moderate and severe HL, respectively. Methods: The individuals from one Portuguese family were evaluated by pure tone audiometry and blood samples were collected for DNA extraction. Polymerase chain reaction (PCR) amplification of GJB2 coding region followed standard methodologies. PCR products were automatically sequenced in both directions. A random control sample of 480 Portuguese individuals was also screened for the GJB2 coding region. Results: A novel mutation, c.638T>A (p.Leu213X), was identified in the GJB2 gene. This nonsense mutation was found in both siblings, and was inherited from their hearing father. Molecular analysis showed that the two siblings were also heterozygous for c.333-334delAA, a previously described GJB2 deletion, inherited from their hearing mother. The novel mutation wasn’t found in the control sample. The mutation p.Leu213X is located to the C-terminus domain of the connexin-26 and changes the codon 213, that codes for a highly conserved and slowly evolving residue of this protein, to a STOP codon, leading to the deletion of the last 14 amino acids of the protein. Conclusions: The HL of the two Portuguese siblings is most probably due to the presence of the c.333-334delAA deletion and the p.Leu213X novel mutation, in compound heterozygosity.
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Matos TD, Simões-Teixeira H, Caria H, Gonçalves AC, Chora J, Correia MDC, Moura C, Rosa H, Monteiro L, O'Neill A, Dias Ó, Andrea M, Fialho G. Spectrum and frequency of GJB2 mutations in a cohort of 264 Portuguese nonsyndromic sensorineural hearing loss patients. Int J Audiol 2013; 52:466-71. [PMID: 23668481 DOI: 10.3109/14992027.2013.783719] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To assess the spectrum and prevalence of mutations in the GJB2 gene in Portuguese nonsyndromic sensorineural hearing loss (NSSHL) patients. DESIGN Sequencing of the coding region, basal promoter, exon 1, and donor splice site of the GJB2 gene; screening for the presence of the two common GJB6 deletions. STUDY SAMPLE A cohort of 264 Portuguese NSSHL patients. RESULTS At least one out of 21 different GJB2 variants was identified in 80 (30.2%) of the 264 patients analysed. Two mutant alleles were found in 53 (20%) of these probands, of which 83% (44/53) harboured at least one c.35delG allele. Twenty-seven (10.2%) of the probands harboured only one mutant allele. Subsequent analysis revealed that the GJB6 deletion del(GJB6-D13S1854) was present in at least 7.4% (2/27) of the patients carrying only one mutant GJB2 allele. Overall, one in five (55/264) of the patients were diagnosed as having DFNB1-related NSSHL, of which the vast majority (53/55) harboured only GJB2 mutations. CONCLUSIONS This study provides clear demonstration that mutations in the GJB2 gene are an important cause of NSSHL in Portugal, thus representing a valuable indicator as regards therapeutical and rehabilitation options, as well as genetic counseling of these patients and their families.
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Affiliation(s)
- Tiago Daniel Matos
- Centre for Biodiversity, Functional, and Integrative Genomics BioFIG, Faculty of Science, University of Lisbon, Lisboa, Portugal
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Gonçalves AC, Chora J, Matos TD, Santos R, O'Neill A, Escada P, Fialho G, Caria H. A novel p.Leu213X mutation in GJB2 gene in a Portuguese family. Int J Pediatr Otorhinolaryngol 2013; 77:89-91. [PMID: 23141775 DOI: 10.1016/j.ijporl.2012.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 10/04/2012] [Accepted: 10/06/2012] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Hearing loss is the most common sensory disability and is present in about 1.9 per 1000 infants at birth. The DFNB1 locus (13q11-q12) includes the genes GJB2, coding for connexin 26, and GJB6, encoding connexin 30. More than 100 mutations have been identified associated with autosomal dominant and recessive hearing loss in the GJB2 gene. OBJECTIVES The aim of the present study was to identify the genetic aetiology of deafness in two Portuguese individuals, presenting nonsyndromic sensorineural moderate and severe hearing loss, respectively. PATIENTS AND METHODS The individuals were evaluated in both ears by pure tone audiometry and blood samples were collected after written informed consent was signed. DNA extraction and PCR amplification of GJB2 coding region followed standard methodologies. PCR products were automatically sequenced in both directions. RESULTS We identified a novel mutation, c.638T>A (p.Leu213X), in GJB2 gene. This nonsense mutation was found in both siblings, and was inherited from their hearing father. Molecular analysis showed that the two siblings were also heterozygous for c.333-334delAA, a previously described GJB2 deletion. This novel mutation was not found in a random control sample of 480 individuals that were screened for coding region of GJB2 gene. p.Leu213X mutation identified in this study for the first time changes the codon 213, coding for a highly conserved and slowly evolving residue of connexin 26, localised to the C-terminus domain of the protein, to a STOP codon, leading to the deletion of the last 14 amino acids of the protein. CONCLUSION We can conclude that the aetiology of deafness in these individuals is due to the GJB2 genotype involving the c.333-334delAA deletion and the novel p.Leu213X mutation in compound heterozygosity.
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Affiliation(s)
- Ana Cláudia Gonçalves
- BioFIG, Center for Biodiversity, Functional and Integrative Genomics, Faculty of Science of the University of Lisbon, Portugal
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Matos TD, Simões-Teixeira H, Caria H, Cascão R, Rosa H, O'Neill A, Dias O, Andrea ME, Kelsell DP, Fialho G. Assessing Noncoding Sequence Variants of GJB2 for Hearing Loss Association. Genet Res Int 2011; 2011:827469. [PMID: 22567369 PMCID: PMC3335567 DOI: 10.4061/2011/827469] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Revised: 07/19/2011] [Accepted: 07/27/2011] [Indexed: 12/03/2022]
Abstract
Involvement of GJB2 noncoding regions in hearing loss (HL) has not been extensively investigated. However, three noncoding mutations, c.-259C>T, c.-23G>T, and c.-23+1G>A, were reported. Also, c.-684_-675del, of uncertain pathogenicity, was found upstream of the basal promoter. We performed a detailed analysis of GJB2 noncoding regions in Portuguese HL patients (previously screened for GJB2 coding mutations and the common GJB6 deletions) and in control subjects, by sequencing the basal promoter and flanking upstream region, exon 1, and 3'UTR. All individuals were genotyped for c.-684_-675del and 14 SNPs. Novel variants (c.-731C>T, c.-26G>T, c.*45G>A, and c.*985A>T) were found in controls. A hearing individual homozygous for c.-684_-675del was for the first time identified, supporting the nonpathogenicity of this deletion. Our data indicate linkage disequilibrium (LD) between SNPs rs55704559 (c.*168A>G) and rs5030700 (c.*931C>T) and suggest the association of c.[*168G;*931T] allele with HL. The c.*168A>G change, predicted to alter mRNA folding, might be involved in HL.
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Affiliation(s)
- T D Matos
- Centre for Biodiversity, Functional, and Integrative Genomics (BioFIG), Faculty of Science, University of Lisbon, Campus FCUL, Campo Grande, 1749-016 Lisboa, Portugal
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Simões-Teixeira H, Matos TD, Marques MC, Dias Ó, Andrea M, Barreiros E, Barreiros L, Moreno F, Fialho G, Caria H, del Castillo I. Novel splice-site mutation c.1615-2A>G (IVS14-2A>G) in the SLC26A4 gene causing Pendred syndrome in a consanguineous Portuguese family. Am J Med Genet A 2011; 155A:924-7. [DOI: 10.1002/ajmg.a.33740] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Accepted: 09/12/2010] [Indexed: 11/09/2022]
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Matos TD, Simões-Teixeira H, Caria H, Rosa H, O'Neill A, Fialho G. The controversial p.Arg127His mutation in GJB2: report on three Portuguese hearing loss family cases. Genet Test Mol Biomarkers 2010; 14:141-4. [PMID: 19929408 DOI: 10.1089/gtmb.2009.0103] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Mutations in the GJB2 gene account for up to 50% of hereditary nonsyndromic hearing loss in several populations. Over 200 mutations are already described in this gene, and three of them, c.35delG, c.167delT, and c.235delC, are the most frequent in Caucasians, Ashkenazi Jews, and Asians, respectively. Most of GJB2 hearing loss-related mutations are recessive, but a few dominant alleles have also been described. Apart from the clearly pathogenic mutations, there are some other variants whose pathogenicity is still controversial, such as p.Met34Thr, p.Val37Ile, p.Arg127His, and p.Val153Ile. The p.Arg127His allele has been found in some mono- and biallelic hearing-impaired patients from several countries. In this article we report on some Portuguese patients harboring this mutation. Taking into consideration the analysis of these Portuguese cases as well as the genetic and functional data regarding p.Arg127His available in the literature, we conclude that this variant may be a cause of hearing loss depending on environmental factors and/or genetic background.
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Affiliation(s)
- Tiago D Matos
- Faculty of Science, Centre for Biodiversity, Functional, and Integrative Genomics (BioFIG), University of Lisbon, Lisbon, Portugal
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Hilgert N, Huentelman MJ, Thorburn AQ, Fransen E, Dieltjens N, Mueller-Malesinska M, Pollak A, Skorka A, Waligora J, Ploski R, Castorina P, Primignani P, Ambrosetti U, Murgia A, Orzan E, Pandya A, Arnos K, Norris V, Seeman P, Janousek P, Feldmann D, Marlin S, Denoyelle F, Nishimura CJ, Janecke A, Nekahm-Heis D, Martini A, Mennucci E, Tóth T, Sziklai I, Del Castillo I, Moreno F, Petersen MB, Iliadou V, Tekin M, Incesulu A, Nowakowska E, Bal J, Van de Heyning P, Roux AF, Blanchet C, Goizet C, Lancelot G, Fialho G, Caria H, Liu XZ, Xiaomei O, Govaerts P, Grønskov K, Hostmark K, Frei K, Dhooge I, Vlaeminck S, Kunstmann E, Van Laer L, Smith RJH, Van Camp G. Phenotypic variability of patients homozygous for the GJB2 mutation 35delG cannot be explained by the influence of one major modifier gene. Eur J Hum Genet 2008; 17:517-24. [PMID: 18985073 DOI: 10.1038/ejhg.2008.201] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Hereditary hearing loss (HL) is a very heterogeneous trait, with 46 gene identifications for non-syndromic HL. Mutations in GJB2 cause up to half of all cases of severe-to-profound congenital autosomal recessive non-syndromic HL, with 35delG being the most frequent mutation in Caucasians. Although a genotype-phenotype correlation has been established for most GJB2 genotypes, the HL of 35delG homozygous patients is mild to profound. We hypothesise that this phenotypic variability is at least partly caused by the influence of modifier genes. By performing a whole-genome association (WGA) study on 35delG homozygotes, we sought to identify modifier genes. The association study was performed by comparing the genotypes of mild/moderate cases and profound cases. The first analysis included a pooling-based WGA study of a first set of 255 samples by using both the Illumina 550K and Affymetrix 500K chips. This analysis resulted in a ranking of all analysed single-nucleotide polymorphisms (SNPs) according to their P-values. The top 250 most significantly associated SNPs were genotyped individually in the same sample set. All 192 SNPs that still had significant P-values were genotyped in a second independent set of 297 samples for replication. The significant P-values were replicated in nine SNPs, with combined P-values between 3 x 10(-3) and 1 x 10(-4). This study suggests that the phenotypic variability in 35delG homozygous patients cannot be explained by the effect of one major modifier gene. Significantly associated SNPs may reflect a small modifying effect on the phenotype. Increasing the power of the study will be of greatest importance to confirm these results.
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Affiliation(s)
- Nele Hilgert
- Department of Medical Genetics, University of Antwerp, Antwerp, Belgium
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Matos TD, Caria H, Simões-Teixeira H, Aasen T, Dias O, Andrea M, Kelsell DP, Fialho G. A novel M163L mutation in connexin 26 causing cell death and associated with autosomal dominant hearing loss. Hear Res 2008; 240:87-92. [PMID: 18472371 DOI: 10.1016/j.heares.2008.03.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 03/14/2008] [Accepted: 03/17/2008] [Indexed: 11/17/2022]
Abstract
Mutations in GJB2 gene (encoding connexin 26) are the most common cause of hereditary non-syndromic sensorineural hearing loss (NSSHL) in different populations. The majority of GJB2 mutations are recessive, but a few dominant mutations have been associated with hearing loss either isolated or associated with skin disease. We describe a novel dominant pathogenic GJB2 mutation, identified in a Portuguese family affected with bilateral mild/moderate high-frequency NSSHL. In vitro functional studies demonstrate that the mutant protein (p.M163L) has defective trafficking to the plasma membrane and is associated with increased cell death.
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Affiliation(s)
- T D Matos
- Centro de Genética e Biologia Molecular, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal
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Matos TD, Caria H, Simões-Teixeira H, Aasen T, Nickel R, Jagger DJ, O'Neill A, Kelsell DP, Fialho G. A novel hearing-loss-related mutation occurring in the GJB2 basal promoter. J Med Genet 2007; 44:721-5. [PMID: 17660464 PMCID: PMC2752183 DOI: 10.1136/jmg.2007.050682] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Mutations in the GJB2 gene are a major cause of non-syndromic recessive hearing loss in many countries. In a significant fraction of patients, only monoallelic GJB2 mutations known to be either recessive or of unclear pathogenicity are identified. This paper reports a novel GJB2 mutation, -3438C-->T, found in the basal promoter of the gene, in trans with V84M, in a patient with profound hearing impairment. This novel mutation can abolish the basal promoter activity of GJB2. These results highlight the importance of extending the mutational screening to regions outside the coding region of GJB2.
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Matos T, Caria H, Teixeira H, Fialho G. Gene symbol: GJB2. Hum Genet 2007; 121:298. [PMID: 17598246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Affiliation(s)
- Tiago Matos
- Centre of Genetics and Molecular Biology, ICAT, Campus da FCUL, Campo Grande 1749-016, Lisbon, Portugal.
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Snoeckx RL, Huygen PLM, Feldmann D, Marlin S, Denoyelle F, Waligora J, Mueller-Malesinska M, Pollak A, Ploski R, Murgia A, Orzan E, Castorina P, Ambrosetti U, Nowakowska-Szyrwinska E, Bal J, Wiszniewski W, Janecke AR, Nekahm-Heis D, Seeman P, Bendova O, Kenna MA, Frangulov A, Rehm HL, Tekin M, Incesulu A, Dahl HHM, du Sart D, Jenkins L, Lucas D, Bitner-Glindzicz M, Avraham KB, Brownstein Z, del Castillo I, Moreno F, Blin N, Pfister M, Sziklai I, Toth T, Kelley PM, Cohn ES, Van Maldergem L, Hilbert P, Roux AF, Mondain M, Hoefsloot LH, Cremers CWRJ, Löppönen T, Löppönen H, Parving A, Gronskov K, Schrijver I, Roberson J, Gualandi F, Martini A, Lina-Granade G, Pallares-Ruiz N, Correia C, Fialho G, Cryns K, Hilgert N, Van de Heyning P, Nishimura CJ, Smith RJH, Van Camp G. GJB2 mutations and degree of hearing loss: a multicenter study. Am J Hum Genet 2005; 77:945-57. [PMID: 16380907 PMCID: PMC1285178 DOI: 10.1086/497996] [Citation(s) in RCA: 372] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2005] [Accepted: 09/08/2005] [Indexed: 01/17/2023] Open
Abstract
Hearing impairment (HI) affects 1 in 650 newborns, which makes it the most common congenital sensory impairment. Despite extraordinary genetic heterogeneity, mutations in one gene, GJB2, which encodes the connexin 26 protein and is involved in inner ear homeostasis, are found in up to 50% of patients with autosomal recessive nonsyndromic hearing loss. Because of the high frequency of GJB2 mutations, mutation analysis of this gene is widely available as a diagnostic test. In this study, we assessed the association between genotype and degree of hearing loss in persons with HI and biallelic GJB2 mutations. We performed cross-sectional analyses of GJB2 genotype and audiometric data from 1,531 persons, from 16 different countries, with autosomal recessive, mild-to-profound nonsyndromic HI. The median age of all participants was 8 years; 90% of persons were within the age range of 0-26 years. Of the 83 different mutations identified, 47 were classified as nontruncating, and 36 as truncating. A total of 153 different genotypes were found, of which 56 were homozygous truncating (T/T), 30 were homozygous nontruncating (NT/NT), and 67 were compound heterozygous truncating/nontruncating (T/NT). The degree of HI associated with biallelic truncating mutations was significantly more severe than the HI associated with biallelic nontruncating mutations (P<.0001). The HI of 48 different genotypes was less severe than that of 35delG homozygotes. Several common mutations (M34T, V37I, and L90P) were associated with mild-to-moderate HI (median 25-40 dB). Two genotypes--35delG/R143W (median 105 dB) and 35delG/dela(GJB6-D13S1830) (median 108 dB)--had significantly more-severe HI than that of 35delG homozygotes.
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Affiliation(s)
- Rikkert L Snoeckx
- Department of Medical Genetics, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
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Caria H, Matos T, Oliveira-Soares R, Santos AR, Galhardo I, Soares-Almeida L, Dias O, Andrea M, Correia C, Fialho G. A7445G mtDNA mutation present in a Portuguese family exhibiting hereditary deafness and palmoplantar keratoderma. J Eur Acad Dermatol Venereol 2005; 19:455-8. [PMID: 15987292 DOI: 10.1111/j.1468-3083.2005.01087.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mitochondrial DNA (mtDNA) A7445G point mutation has been shown to be responsible for familial nonepidermolytic palmoplantar keratoderma (NEPPK) associated with deafness without any additional features. To date, only a few cases have been described. We report a Portuguese pedigree presenting an inherited combination of NEPPK and sensorineural deafness compatible with maternal transmission. Clinical expression and age of onset of NEPPK and deafness were variable. Normal expression patterns of epidermal keratins and filaggrin, intercellular junction proteins including connexin 26, loricrin and cornified envelope proteins, were observed. Molecular analysis revealed that all the affected members, previously screened for Cx26 mutations with negative results, presented the mtDNA A7445G point mutation in the homoplasmic form. To our knowledge, this is the fifth family in whom inherited NEPPK and hearing loss are related to this mitochondrial mutation.
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Affiliation(s)
- H Caria
- Centre of Genetics and Molecular Biology, University of Lisbon, Instituto de Ciênca Aplicada e Tecnologia, Edificio ICAT, Campus da FCUL, Campo Grande, 1749-016 Lisbon, Portugal
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