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Mkaouar R, Riahi Z, Marrakchi J, Mezzi N, Romdhane L, Boujemaa M, Dallali H, Sayeb M, Lahbib S, Jaouadi H, Boudabbous H, Zekri L, Chargui M, Messaoud O, Elyounsi M, Kraoua I, Zaouak A, Turki I, Mokni M, Boucher S, Petit C, Giraudet F, Mbarek C, Besbes G, Halayem S, Zainine R, Turki H, Tounsi A, Bonnet C, Mrad R, Abdelhak S, Trabelsi M, Charfeddine C. Current phenotypic and genetic spectrum of syndromic deafness in Tunisia: paving the way for precision auditory health. Front Genet 2024; 15:1384094. [PMID: 38711914 PMCID: PMC11072975 DOI: 10.3389/fgene.2024.1384094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 03/15/2024] [Indexed: 05/08/2024] Open
Abstract
Hearing impairment (HI) is a prevalent neurosensory condition globally, impacting 5% of the population, with over 50% of congenital cases attributed to genetic etiologies. In Tunisia, HI underdiagnosis prevails, primarily due to limited access to comprehensive clinical tools, particularly for syndromic deafness (SD), characterized by clinical and genetic heterogeneity. This study aimed to uncover the SD spectrum through a 14-year investigation of a Tunisian cohort encompassing over 700 patients from four referral centers (2007-2021). Employing Sanger sequencing, Targeted Panel Gene Sequencing, and Whole Exome Sequencing, genetic analysis in 30 SD patients identified diagnoses such as Usher syndrome, Waardenburg syndrome, cranio-facial-hand-deafness syndrome, and H syndrome. This latter is a rare genodermatosis characterized by HI, hyperpigmentation, hypertrichosis, and systemic manifestations. A meta-analysis integrating our findings with existing data revealed that nearly 50% of Tunisian SD cases corresponded to rare inherited metabolic disorders. Distinguishing between non-syndromic and syndromic HI poses a challenge, where the age of onset and progression of features significantly impact accurate diagnoses. Despite advancements in local genetic characterization capabilities, certain ultra-rare forms of SD remain underdiagnosed. This research contributes critical insights to inform molecular diagnosis approaches for SD in Tunisia and the broader North-African region, thereby facilitating informed decision-making in clinical practice.
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Affiliation(s)
- Rahma Mkaouar
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Zied Riahi
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Jihene Marrakchi
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Otorhinolaryngology, District Hospital of Menzel Bourguiba, Bizerte, Tunisia
| | - Nessrine Mezzi
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Biology, Faculty of Sciences of Bizerte, Université Tunis Carthage, Tunis, Tunisia
| | - Lilia Romdhane
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Biology, Faculty of Sciences of Bizerte, Université Tunis Carthage, Tunis, Tunisia
| | - Maroua Boujemaa
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Hamza Dallali
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Genetic Typing Service, Institut Pasteur of Tunis, Tunis, Tunisia
| | - Marwa Sayeb
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Saida Lahbib
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Hager Jaouadi
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Marseille Medical Genetics (MMG) U1251, Aix Marseille Université, INSERM, Marseille, France
| | - Hela Boudabbous
- Department of Pediatrics, La Rabta Hospital, Tunis, Tunisia
- Laboratory of Hereditary Diseases of the Metabolism Investigation and Patients Management, Faculty of Medicine in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Epidemiology and Public Health, Directorate General of Military Health, Faculty of Medicine in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Lotfi Zekri
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- ICHARA Association (International Research Institute on Sign Language), Tunis, Tunisia
| | - Mariem Chargui
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Olfa Messaoud
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Meriem Elyounsi
- Department of Congenital and Hereditary Diseases, Charles Nicolle Hospital in Tunis, Tunis, Tunisia
- LR99ES10 Laboratory of Human Genetics, Faculty of Medicine in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Ichraf Kraoua
- Child and Adolescent Neurology Department of Neurology, National Institute of Neurology, Tunis, Tunisia
- LR18SP04 Department of Child Neurology, National Institute Mongi Ben Hmida of Neurology in Tunis. University of Tunis El Manar, Tunis, Tunisia
| | - Anissa Zaouak
- Department of Dermatology, Habib Thameur Hospital, Research Unit Genodermatoses and Cancers LR12SP03, Tunis, Tunisia
| | - Ilhem Turki
- Child and Adolescent Neurology Department of Neurology, National Institute of Neurology, Tunis, Tunisia
- LR18SP04 Department of Child Neurology, National Institute Mongi Ben Hmida of Neurology in Tunis. University of Tunis El Manar, Tunis, Tunisia
| | - Mourad Mokni
- Service de dermatologie, Hôpital La Rabta, Unité de recherche UR 12SP07, Hôpital La Rabta, Tunis, Tunisia
| | - Sophie Boucher
- Service d’ORL et chirurgie cervico-faciale, CHU d’Angers, Angers, France
- Equipe Mitolab, Institut Mitovasc, CNRS UMR6015, UMR Inserm 1083, Université d’Angers, Angers, France
| | - Christine Petit
- Institut Pasteur, Université Paris Cité, Inserm UA06, Institut de l’Audition, Paris, France
- Collège de France, Paris, France
| | - Fabrice Giraudet
- Unité Mixte de Recherche (UMR) 1107, INSERM, Clermont-Ferrand, France
- Centre Auditif SoluSons, Clermont-Ferrand, France
| | - Chiraz Mbarek
- ENT Department, Habib Thameur Hospital, Tunis, Tunisia
| | - Ghazi Besbes
- Department of Otorhinolaryngology and Maxillofacial Surgery - La Rabta Hospital in Tunis, Tunis, Tunisia
| | - Soumeyya Halayem
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Service de pédopsychiatrie, Hôpital Razi, Faculté de Médecine de Tunis, Université Tunis el Manar, Tunis, Tunisia
| | - Rim Zainine
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Otorhinolaryngology and Maxillofacial Surgery - La Rabta Hospital in Tunis, Tunis, Tunisia
| | - Hamida Turki
- Dermatology Department Hedi Chaker University Hospital, Sfax University Sfax Tunisia, Tunis, Tunisia
| | | | - Crystel Bonnet
- Institut Pasteur, Université Paris Cité, Inserm UA06, Institut de l’Audition, Paris, France
| | - Ridha Mrad
- Department of Congenital and Hereditary Diseases, Charles Nicolle Hospital in Tunis, Tunis, Tunisia
- LR99ES10 Laboratory of Human Genetics, Faculty of Medicine in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Sonia Abdelhak
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Mediha Trabelsi
- Department of Congenital and Hereditary Diseases, Charles Nicolle Hospital in Tunis, Tunis, Tunisia
- LR99ES10 Laboratory of Human Genetics, Faculty of Medicine in Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Cherine Charfeddine
- Laboratory of Biomedical Genomics and Oncogenetics LR16IPT05, Pasteur Institute in Tunis, University of Tunis El Manar, Tunis, Tunisia
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Salame M, Bonnet C, Moctar ECM, Brahim SM, Dedy A, Vetah LA, Veten F, Hamed CT, Petit C, Houmeida A. Identification a novel pathogenic LRTOMT mutation in Mauritanian families with nonsyndromic deafness. Eur Arch Otorhinolaryngol 2023; 280:4057-4063. [PMID: 36928321 DOI: 10.1007/s00405-023-07907-z] [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] [Received: 09/30/2022] [Accepted: 02/27/2023] [Indexed: 03/18/2023]
Abstract
PURPOSE Although recessive mutations in GJB2 are the common genetic etiology of sensorineural hearing impairment (SNHI), variants in LRTOMT gene were also identified, mostly in Middle East and North African populations. METHODS Using Sanger sequencing we screened the exon 7 of LRTOMT in a cohort of 128 unrelated Mauritanian children with congenital deafness. RESULTS Only one biallelic missense mutation, predicted as pathogenic (c.179 T > C;p.Leu60Pro) was found at homozygous state in four families. This variant, not reported before, showed a deleterious effect by SIFT (score: 0.01) and a disease-causing effect by Mutation Taster (prob: 1). Exploration of the encoded protein 3D structure revealed a disruption from an organized α helix (in the normal protein structure) into a random conformation. Early fitting of a cochlear implant seemed to improve the audition ability of the mutation carrier. CONCLUSION Further screening using a panel of deafness genes may expose other variants underlying hearing impairment in our population.
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Affiliation(s)
- Malak Salame
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, UNA-FST, Nouakchott, Mauritania
| | - Crystel Bonnet
- Institut de l'AuditionInstitut Pasteur, Inserm, Paris, France
| | - Ely Cheikh Mohamed Moctar
- Division of Otolaryngology, Department of Surgery, University of California, San Diego, 9500 Gilman Drive, Mail Code 0666, La Jolla, CA, 92093, USA
| | - Selma Mohamed Brahim
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, UNA-FST, Nouakchott, Mauritania
- Centre National d'Oncologie (CNO), Unité de Recherche et d'Enseignement, Nouakchott, Mauritania
| | - Abdallahi Dedy
- Centre Hospitalier National de Nouakchott (CHN), Nouakchott, Mauritania
| | | | - Fatimetou Veten
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, UNA-FST, Nouakchott, Mauritania
| | | | - Christine Petit
- Institut de l'AuditionInstitut Pasteur, Inserm, Paris, France
- Collège de France, Paris, France
| | - Ahmed Houmeida
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, UNA-FST, Nouakchott, Mauritania.
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AitRaise I, Amalou G, Bousfiha A, Charoute H, Rouba H, Abdelghaffar H, Bonnet C, Petit C, Barakat A. Genetic heterogeneity in GJB2, COL4A3, ATP6V1B1 and EDNRB variants detected among hearing impaired families in Morocco. Mol Biol Rep 2022; 49:3949-3954. [PMID: 35301649 DOI: 10.1007/s11033-022-07245-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 02/04/2022] [Accepted: 02/08/2022] [Indexed: 11/24/2022]
Abstract
BACKGROUND Deafness is the most prevalent human sensorineural defect. It may occur as a result of an external auditory canal involvement, or a deficiency in the sound conduction mechanism, or an impairment of the cochlea, the cochlear nerve or central auditory perception. The genetic causes are the most common, as approximately 70% of hearing disorders are of hereditary origin, divided into two groups, syndromic (associated with other symptoms) and no syndromic (isolated deafness). METHODS A whole exome sequencing was performed to identify the genetic cause of hearing loss in six Moroccan families and Sanger sequencing was used to validate mutations in these genes. THE RESULTS The results of four out of the six families revealed four genetic variants in the genes GJB2, COL4A3, ATP6V1B1 and EDNRB responsible for non-syndromic and syndromic hearing loss. Multiple Bioinformatics programs and molecular modelling predicted the pathogenic effect of these mutations. CONCLUSIONS We identified in Moroccan deaf patients four homozygous mutations. These results show the importance of whole exome sequencing to identify pathogenic mutations in heterogeneous disorders with multiple genes responsible.
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Affiliation(s)
- Imane AitRaise
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco.,Laboratoire de Biochimie, Environnement et Agroalimentaire, Faculty of Science and Techniques of Mohammedia, Hassan II University of Casablanca, Casablanca, Morocco
| | - Ghita Amalou
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Amale Bousfiha
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco.,Laboratoire de physiopathologie et génétique moléculaire, Faculté des Sciences Ben M'sik, Université Hassan II, Casablanca, Morocco
| | - Hicham Charoute
- Research unit of epidemiology, biostatistics and bioinformatics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Hassan Rouba
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Houria Abdelghaffar
- Laboratoire de Biochimie, Environnement et Agroalimentaire, Faculty of Science and Techniques of Mohammedia, Hassan II University of Casablanca, Casablanca, Morocco
| | - Crystel Bonnet
- Unité de Génétique et Physiologie de l'Audition, Institut Pasteur, 75015, Paris, France
| | - Christine Petit
- Unité de Génétique et Physiologie de l'Audition, Institut Pasteur, 75015, Paris, France.,Institut de l'Audition, 75012, Paris, France.,Collège de France, 75005, Paris, France
| | - Adbelhamid Barakat
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco.
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Kim Y, Han JH, Yoo HS, Choi BY. Molecular aetiology of ski-slope hearing loss and audiological course of cochlear implantees. Eur Arch Otorhinolaryngol 2022; 279:4871-4882. [PMID: 35212774 DOI: 10.1007/s00405-022-07317-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 02/10/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE A challenge for patients with ski-slope hearing loss is that hearing aids do not adequately amplify the mid-to-high frequencies necessary for speech perception and conversely, cochlear implant (CI) may damage low-frequency hearing. We aimed to describe the clinical profile of patients with ski-slope hearing loss, with a special focus on aetiology of such hearing loss and audiological course of low-frequency hearing after CI. METHODS We recruited hearing-impaired patients who visited a tertiary referral centre and met the criteria for ski-slope hearing loss patients from 2015 to 2021. Genetic testing was performed in all ski-slope hearing loss patients unless refused. Baseline audiograms of patients who continued to use hearing aids or who finally underwent CIs were reviewed. As for CI patients, outcome and hearing preservation rate were rigorously analysed. RESULTS Of 46 recruited patients with ski-slope hearing loss, 45 agreed to undergo genetic testing and causative variants were identified in 17 (37.8%) patients. The TMC1, MYO7A, and TMPRSS3 variants were the most common, while LRTOMT was newly identified as a causative gene. Twenty-five patients eventually received CI, while 13 continued to wear the hearing aid and 8 patients did not ever try hearing aids. CI in ski-slope hearing loss led to immediate and sufficient improvement of sentence recognition by as early as 3 months, however, the duration of hearing loss was inversely correlated with the sentence recognition score. The average hearing preservation rate (using the HEARRING classification) after CI was 53.0% (SD 30.0) and 45.6% (SD 31.1) at 1 year. Seventy-nine percent of implantees maintained functional low-frequency hearing (better than 85 dB at 250 and 500 Hz) eligible for electric-acoustic stimulation (EAS). A trend was found that patients with hair cell stereocilia-associated genetic variants may have a slightly better preservation, albeit with no statistical significance. CONCLUSION Detection rate of a molecular genetic aetiology of ski-slope hearing loss appears to be lower than other type of hearing loss reported in the literature. Especially with short hearing loss duration, CI in ski-slope hearing loss leads to immediate and sufficient speech improvement, while preserving functional low-frequency hearing eligible for EAS as many as in 79%. A certain genetic aetiology might be associated with a trend towards better low-frequency hearing preservation.
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Affiliation(s)
- Yehree Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 463-707, Republic of Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 463-707, Republic of Korea
| | - Hyo Soon Yoo
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 463-707, Republic of Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 463-707, Republic of Korea.
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Wang Y, Ma Y, Qin Y, Zeng Z, Zhong Z, Qi Y, Liu Y. Novel Mutations in LRTOMT Associated with Congenital Profound Sensorineural Hearing Loss in a Chinese Patient. RUSS J GENET+ 2021. [DOI: 10.1134/s1022795421110144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Mosrati MA, Fadhlaoui-Zid K, Benammar-Elgaaied A, Gibriel AA, Ben Said M, Masmoudi S. Deep analysis of the LRTOMTc.242G>A variant in non-syndromic hearing loss North African patients and the Berber population: Implications for genetic diagnosis and genealogical studies. Mol Genet Genomic Med 2021; 9:e1810. [PMID: 34514748 PMCID: PMC8580077 DOI: 10.1002/mgg3.1810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 05/15/2021] [Accepted: 08/24/2021] [Indexed: 11/13/2022] Open
Abstract
Autosomal recessive non‐syndromic hearing loss (ARNSHL) is the most common inherited sensory impairment. It is particularly frequent in North African populations who have a high rate of consanguineous marriage. The c.242G>A homozygous variant in LRTOMT gene was previously established as pathogenic and is associated with NSHL in both humans and mice. The aim of this study is to determine the carrier frequency for the LRTOMT c.242G>A variant and also to estimate its age in addition to evaluating its diagnostic potential as a deafness biomarker among various populations and ethnicities in Northern African countries. A total of 179 Tunisian and 34 Libyan unrelated deafness patients were screened for this variant. The homozygous c.242G>A variant was found in 5.02% and 2.94% in Tunisian and Libyan families, respectively. Subsequent screening for this variant in 263 healthy controls of various ethnicities (136 Tunisian Berbers, 32 Andalusian and 95 Tunisian from undefined ethnic origin) revealed higher frequency for the heterozygous state among Tunisians of Berber origin only (19.11%). Genotyping 7 microsatellite markers nearby the variant location in ARNSHL patients who had the homozygous variant revealed the same haplotype suggesting a common founder origin for this variant. The age of this variant was estimated to be between 2025 and 3425 years (this corresponds to 3400 years when the variant rate was set at 10−3 or 2600 years when the variant rate is set at 10−2), spreading along with the Berber population who migrated to North Africa. In conclusion, the LRTOMT c.242G>A homozygous variant could be used as a useful deafness biomarker for North African ARNSHL patients meanwhile the heterozygous variant could be utilized in genealogical studies for tracing those of the Berber ethnic group.
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Affiliation(s)
- Mohamed Ali Mosrati
- Laboratoire de Procédés de Criblages Moléculaire et Cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisie
| | - Karima Fadhlaoui-Zid
- Laboratory of Genetics, Immunology, and Human Pathologies, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia.,Department of Biology, College of Science, Taibah University, Al Madinah Al Munawarah, Saudi Arabia.,Higher Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
| | - Amel Benammar-Elgaaied
- Laboratory of Genetics, Immunology, and Human Pathologies, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
| | - Abdullah Ahmed Gibriel
- Department of Biochemistry and Molecular Biology, Faculty of Pharmacy, The British University in Egypt (BUE), Cairo, Egypt
| | - Mariem Ben Said
- Laboratoire de Procédés de Criblages Moléculaire et Cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisie
| | - Saber Masmoudi
- Laboratoire de Procédés de Criblages Moléculaire et Cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisie
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Souissi A, Gibriel AA, Masmoudi S. Genetics and meta-analysis of recessive non-syndromic hearing impairment and Usher syndrome in Maghreb population: lessons from the past, contemporary actualities and future challenges. Hum Genet 2021; 141:583-593. [PMID: 34268600 DOI: 10.1007/s00439-021-02314-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/08/2021] [Indexed: 11/29/2022]
Abstract
Hereditary hearing impairment (HI) is a heterogeneous condition with over 130 genes associated with genetic non-syndromic HI (NSHI) and Usher syndrome (USH). Approximately 80% of hereditary NSHI cases have autosomal recessive (AR) mode of inheritance. The high rate of consanguinity and endogamy in the Maghreb countries, including Tunisia, Algeria and Morocco, represents a major contributing factor to the development of ARHI. Since the 90s, those populations, with their particular large familiar structure, represented an effective key towards the discovery of the first HI loci and genes. In this study, we performed a deep literature database search to analyze the mutational spectrum and the distribution of pathogenic variants responsible of USH and the NSHI among those populations. To date, 124 pathogenic variants were identified in 32 genes of which over 70% represent population-specific variants. The particular variants' distribution is related to the high rate of consanguinity as well as the multiple shared features such as demographic history of migrations and social behavior that promoted the spreading of several founder mutations within those countries. This is the first study to report lessons from the past and current actualities of HI within the three Maghreb countries. However, despite the great impact placed by such population for the HI genetic studies, only a few next-generation sequencing platforms have so far been implemented with those countries. We, therefore, believe that those countries should be supported to implement this technology that would definitely be of great value in the discovery of additional novel HI genes/variants.
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Affiliation(s)
- Amal Souissi
- Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, University of Sfax, Sidi Mansour road Km 6, BP "1177", 3018, Sfax, Tunisia
| | - Abdullah A Gibriel
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, The British University in Egypt (BUE), Cairo, Egypt
| | - Saber Masmoudi
- Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, University of Sfax, Sidi Mansour road Km 6, BP "1177", 3018, Sfax, Tunisia.
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Abstract
BACKGROUND Hearing loss (HL) is a heterogeneous condition that causes partial or complete hearing impairment. Hundreds of variants in more than 60 genes have been reported to be associated with Hereditary HL (HHL). The HHL prevalence is thought to be high in the Arab population; however, the genetic epidemiology of HHL among Arab populations is understudied. This study aimed to systematically analyze the genetic epidemiology of HHL in Arab countries. METHODS We searched four literature databases (PubMed, Scopus, Science Direct, and Web of Science) from the time of inception until January 2019 using broad search terms to capture all the reported epidemiological and genetic data related to Arab patients with HHL. FINDINGS A total of 2,600 citations were obtained; 96 studies met our inclusion criteria. Our search strategy yielded 121,276 individuals who were tested for HL over 52 years (1966-2018), of whom 8,099 were clinically diagnosed with HL and belonged to 16 Arab countries. A total of 5,394 patients and 61 families with HHL were genotyped, of whom 336 patients and 6 families carried 104 variants in 44 genes and were from 17/22 Arab countries. Of these variants, 72 (in 41 genes) were distinctive to Arab patients. Arab patients manifested distinctive clinical phenotypes. The incidence of HHL in the captured studies ranged from 1.20 to 18 per 1,000 births per year, and the prevalence was the highest in Iraq (76.3%) and the lowest in Jordan (1.5%). INTERPRETATION This is the first systematic review to capture the prevalence and spectrum of variants associated with HHL in an Arab population. There appears to be a distinctive clinical picture for Arab patients with HHL, and the range and distribution of variants among Arab patients differ from those noted in other affected ethnic groups.
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Elrharchi S, Riahi Z, Salime S, Charoute H, Elkhattabi L, Boulouiz R, Kabine M, Bonnet C, Petit C, Barakat A. Novel Mutation in AIFM1 Gene Associated with X-Linked Deafness in a Moroccan Family. Hum Hered 2021; 85:35-39. [PMID: 33486474 DOI: 10.1159/000512712] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 10/20/2020] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION Auditory neuropathy is a hearing disorder where outer hair cell function within the cochlea is normal, but inner hair cell and/or the auditory nerve function is disrupted. It is a heterogeneous disorder, which can have either congenital or acquired causes. METHODS We found a disease-segregating mutation in the X-linked AIFM1 gene through whole-exome sequencing, encoding the apoptosis-inducing factor mitochondrion-associated 1. RESULTS The impact of the c.1045A>G; p.(Ser349Gly) mutation on the AIFM1 protein was predicted using different bioinformatics tools. The pedigree analysis in the examined family was consistent with X-linked dominant inheritance. DISCUSSION/CONCLUSION To our knowledge, this is the first study that identifies a mutation in the AIFM1 gene in Moroccan patients suffering from X-linked auditory neuropathy.
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Affiliation(s)
- Soukaina Elrharchi
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco.,Laboratoire de Santé et Environnement, Faculté des sciences Ain Chock, Université Hassan II, Casablanca, Morocco
| | - Zied Riahi
- INSERM UMRS1120, Institut de la Vision, Paris, France.,UPMC-Sorbonnes Universités Paris-VI, Paris, France
| | - Sara Salime
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco.,Laboratoire de Santé et Environnement, Faculté des sciences Ain Chock, Université Hassan II, Casablanca, Morocco
| | - Hicham Charoute
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Lamiae Elkhattabi
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Redouane Boulouiz
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Mostafa Kabine
- Laboratoire de Santé et Environnement, Faculté des sciences Ain Chock, Université Hassan II, Casablanca, Morocco
| | - Crystel Bonnet
- INSERM UMRS1120, Institut de la Vision, Paris, France.,UPMC-Sorbonnes Universités Paris-VI, Paris, France
| | - Christine Petit
- INSERM UMRS1120, Institut de la Vision, Paris, France.,UPMC-Sorbonnes Universités Paris-VI, Paris, France.,Unité de Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Collège de France, Paris, France
| | - Abdelhamid Barakat
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco,
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10
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Amalou G, Bonnet C, Riahi Z, Bouzidi A, Elrharchi S, Bousfiha A, Charif M, Kandil M, Lenaers G, Petit C, Barakat A. A homozygous MPZL2 deletion is associated with non syndromic hearing loss in a moroccan family. Int J Pediatr Otorhinolaryngol 2021; 140:110481. [PMID: 33234333 DOI: 10.1016/j.ijporl.2020.110481] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 10/29/2020] [Accepted: 10/29/2020] [Indexed: 12/01/2022]
Abstract
Adhesion glycoproteins are implicated in the pathophysiology of hearing loss, the most frequent inherited sensory disorder, affecting 1 in 1000 new-borns. Exome sequencing of a consanguineous Moroccan patient with mild hearing loss identified for the first time in a North African family a single homozygous mutation c.72delA in MPZL2 gene, encoding the Myelin Protein Zero-Like 2, reported as causing deafness in two other populations. Variable tandem repeat genotyping of this family revealed that the c.72delA MPZL2 allele shared a common haplotype with Turkish and Dutch families. These results confirm the pathogenicity of this MPZL2 mutation in recessive mild to moderate non-syndromic deafness.
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Affiliation(s)
- Ghita Amalou
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; MitoLab Team, Institut MitoVasc, UMR CNRS 6015, INSERM U1083, Université d'Angers, Angers, France; Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaib Doukkali University, Eljadida, Morocco
| | - Crystel Bonnet
- Genetics and Physiology of Hearing Laboratory, Institut Pasteur, 75015, Paris, France
| | - Zied Riahi
- Complexité Du Vivant, Sorbonne Universités, 75005, Paris, France
| | - Aymane Bouzidi
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; MitoLab Team, Institut MitoVasc, UMR CNRS 6015, INSERM U1083, Université d'Angers, Angers, France; Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaib Doukkali University, Eljadida, Morocco
| | - Soukaina Elrharchi
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Amale Bousfiha
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; Laboratoire de Physiopathologie et Génétique Moléculaire, Faculté des Sciences Ben M'sik, Université Hassan II, Casablanca, Morocco
| | - Majida Charif
- MitoLab Team, Institut MitoVasc, UMR CNRS 6015, INSERM U1083, Université d'Angers, Angers, France; Genetics, and Immuno-cell Therapy Team, Mohammed First University, Oujda, Morocco
| | - Mostafa Kandil
- Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaib Doukkali University, Eljadida, Morocco
| | - Guy Lenaers
- MitoLab Team, Institut MitoVasc, UMR CNRS 6015, INSERM U1083, Université d'Angers, Angers, France
| | - Christine Petit
- Genetics and Physiology of Hearing Laboratory, Institut Pasteur, 75015, Paris, France; Institut de L'Audition, 75012, Paris, France; Collège de France, 75005, Paris, France
| | - Abdelhamid Barakat
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco.
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11
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Bousfiha A, Riahi Z, Elkhattabi L, Bakhchane A, Charoute H, Snoussi K, Bonnet C, Petit C, Barakat A. Further Evidence for the Implication of the MET Gene in Non-Syndromic Autosomal Recessive Deafness. Hum Hered 2019; 84:109-116. [PMID: 31801140 DOI: 10.1159/000503450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 09/18/2019] [Indexed: 11/19/2022] Open
Abstract
Mutations in the mesenchymal epithelial transition factor (MET) gene are frequently associated with multiple human cancers but can also lead to human non-syndromic autosomal recessive deafness (DFNB97). In the present study, we identified a novel homozygous missense mutation in the METgene causing a non-syndromic hearing impairment DFNB97 form. Whole-exome sequencing was performed to determine the genetic causes of hearing loss in a Moroccan consanguineous family with an affected daughter. The structural analysis of native and mutant in the SEMA domain of the MET receptor was investigated using a molecular dynamics simulation (MDS) approach. We identified a novel pathogenic homozygous c.948A>G (p.Ile316Met) mutation in the MET gene in one deaf Moroccan young girl carrying a total bilateral non-syndromic hearing impairment. The results of the MDS approach show that an Ile316Met mutation in the SEMA domain leads to protein flexibility loss. This may produce a major impact on the structural conformation of the MET receptor, which also affects the function and binding site of the receptor. This is the first time that a mutation in the MET gene is described in a Moroccan family. Moreover, this study reports the second family in the world associating deafness and mutation in the MET gene.
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Affiliation(s)
- Amale Bousfiha
- Laboratoire de Génomique et Génétique Humaine, Institut Pasteur du Maroc, Casablanca, Morocco.,Laboratoire de Physiopathologie et Génétique Moléculaire, Faculté des Sciences Ben M'Sik, Université Hassan II, Casablanca, Morocco
| | - Zied Riahi
- INSERM UMRS1120, Institut de la Vision, Paris, France.,UPMC-Sorbonnes Universités Paris VI, Paris, France
| | - Lamiae Elkhattabi
- Laboratoire de Génomique et Génétique Humaine, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Amina Bakhchane
- Laboratoire de Génomique et Génétique Humaine, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Hicham Charoute
- Laboratoire de Génomique et Génétique Humaine, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Khalid Snoussi
- Laboratoire de Génomique et Génétique Humaine, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Crystel Bonnet
- INSERM UMRS1120, Institut de la Vision, Paris, France.,UPMC-Sorbonnes Universités Paris VI, Paris, France
| | - Christine Petit
- INSERM UMRS1120, Institut de la Vision, Paris, France.,UPMC-Sorbonnes Universités Paris VI, Paris, France.,Unité de Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Collège de France, Paris, France
| | - Abdelhamid Barakat
- Laboratoire de Génomique et Génétique Humaine, Institut Pasteur du Maroc, Casablanca, Morocco,
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12
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Gibriel AA, Abou-Elew MH, Masmoudi S. Analysis of p.Gly12Valfs*2, p.Trp24* and p.Trp77Arg mutations in GJB2 and p.Arg81Gln variant in LRTOMT among non syndromic hearing loss Egyptian patients: implications for genetic diagnosis. Mol Biol Rep 2019; 46:2139-2145. [PMID: 30730013 DOI: 10.1007/s11033-019-04667-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 01/30/2019] [Indexed: 11/28/2022]
Abstract
Hearing loss (HL) is a global sensory disorder that affects children and deprives them from their rights to enjoy standard social and educational levels. Although hundreds of genetic mutations across several genes have been linked to HL, very limited studies are available on Egyptian population which has high rate of consanguinity and HL. The frequency of the p.Gly12Valfs*2, p.Trp24* and p.Trp77Arg mutations in GJB2 along with the p.Arg81Gln variant in LRTOMT gene was investigated in Egyptian patients. 103 non-syndromic HL (NSHL) Egyptian patients and 100 control subjects were recruited in this study. PCR-RFLP and Direct sequencing were performed to screen and confirm presence/absence of those mutations in Egyptian population. The p.Gly12Valfs*2 mutation was found in eight patients (7.8%) (six homozygous and two heterozygous) with an allele frequency of 6.8%. The p.Trp24* and p.Trp77Arg were absent in both HL patients and controls. Another one patient had the heterozygous variant for p.Arg81Gln in LRTOMT gene. This study reports, for the first time, the presence of a heterozygous change for the p.Arg81Gln in LRTOMT gene in one Egyptian patient. The p.Gly12Valfs*2 mutation, but not the p.Trp24* nor the p.Trp77Arg, in GJB2 is the most frequent variant among Egyptian patients and would therefore be recommended for genetic counseling and diagnosis.
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Affiliation(s)
- Abdullah A Gibriel
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, The British University in Egypt (BUE), P.O. Box 259, 11728, Cairo, Egypt.
| | - Maha H Abou-Elew
- Otorhinolaryngology Department, Audio-Vestibular Unit, Faculty of Medicine, Kasr Al-Aini El-Manial University Hospital, Cairo University, Giza, Egypt
| | - Saber Masmoudi
- Laboboratoire Procédés de Criblage Moléculaire et Cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisia
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13
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Elrharchi S, Riahi Z, Salime S, Nahili H, Rouba H, Kabine M, Bonnet C, Petit C, Barakat A. Two novel homozygous missense mutations identified in the BSND gene in Moroccan patients with Bartter's syndrome. Int J Pediatr Otorhinolaryngol 2018; 113:46-50. [PMID: 30174009 DOI: 10.1016/j.ijporl.2018.07.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/05/2018] [Accepted: 07/07/2018] [Indexed: 11/18/2022]
Abstract
OBJECTIVES Hearing loss (HL) is one of the most common sensorineural disorders. In the present study, we identified two novel missense mutations in BSND gene causing Bartter syndrome type IV which is a genetic disease with an autosomal recessive transmission, characterized by hypokalaemia, metabolic alkalosis, an elevation in plasma renin activity and hyperaldosteronism as well as sensorineural deafness. METHODS Whole-exome sequencing was performed to study the genetic causes of Hearing loss in two unrelated patients from two Moroccan families. RESULTS The two novel homozygous mutations p.Arg8Gly (c.22C > G), p.Thr36Asn (c.107C > A) in exon 1 of BSND gene which encodes barttin were identified in 7 patients belonging to two unrelated families originated from central region of Morocco. CONCLUSION We identified two novel missense mutations p.Arg8Gly and p.Thr36Asn in exon 1 of BSND gene; both mutations were described for the first time in Moroccan patients with Bartter syndrome type IV.
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Affiliation(s)
- Soukaina Elrharchi
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco; Laboratoire de santé et environnement, Faculté des Sciences Ain Chock, Université Hassan II, Casablanca, Morocco
| | - Zied Riahi
- INSERM UMRS1120, Institut de la Vision, Paris, France; UPMC-Sorbonnes Universités Paris VI, Paris, France
| | - Sara Salime
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Halima Nahili
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Hassan Rouba
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Mostafa Kabine
- Laboratoire de santé et environnement, Faculté des Sciences Ain Chock, Université Hassan II, Casablanca, Morocco
| | - Crystel Bonnet
- INSERM UMRS1120, Institut de la Vision, Paris, France; UPMC-Sorbonnes Universités Paris VI, Paris, France
| | - Christine Petit
- INSERM UMRS1120, Institut de la Vision, Paris, France; UPMC-Sorbonnes Universités Paris VI, Paris, France; Unité de Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France; Collège de France, Paris, France
| | - Abdelhamid Barakat
- Laboratory of Genomics and Human Genetics, Institut Pasteur du Maroc, Casablanca, Morocco.
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14
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Bousfiha A, Bakhchane A, Charoute H, Detsouli M, Rouba H, Charif M, Lenaers G, Barakat A. Novel compound heterozygous mutations in the GPR98 (USH2C) gene identified by whole exome sequencing in a Moroccan deaf family. Mol Biol Rep 2017; 44:429-434. [PMID: 28951997 DOI: 10.1007/s11033-017-4129-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 09/19/2017] [Indexed: 01/26/2023]
Abstract
In the present work, we identified two novel compound heterozygote mutations in the GPR98 (G protein-coupled receptor 98) gene causing Usher syndrome. Whole-exome sequencing was performed to study the genetic causes of Usher syndrome in a Moroccan family with three affected siblings. We identify two novel compound heterozygote mutations (c.1054C > A, c.16544delT) in the GPR98 gene in the three affected siblings carrying post-linguale bilateral moderate hearing loss with normal vestibular functions and before installing visual disturbances. This is the first time that mutations in the GPR98 gene are described in the Moroccan deaf patients.
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Affiliation(s)
- Amale Bousfiha
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, 1, Place Louis Pasteur, 20360, Casablanca, Morocco.,Laboratoire des Sciences Biologiques, Filière Technique de Santé, Institution Supérieure des Professions Infirmières et Techniques de Santé (ISPITS), Casablanca, Morocco
| | - Amina Bakhchane
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, 1, Place Louis Pasteur, 20360, Casablanca, Morocco
| | - Hicham Charoute
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, 1, Place Louis Pasteur, 20360, Casablanca, Morocco
| | - Mustapha Detsouli
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, 1, Place Louis Pasteur, 20360, Casablanca, Morocco
| | - Hassan Rouba
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, 1, Place Louis Pasteur, 20360, Casablanca, Morocco
| | - Majida Charif
- PREMMI, Mitochondrial Medicine Research Centre, Université d'Angers, CHU Bât IRIS/IBS, Rue des Capucins, 49933, Angers Cedex 9, France
| | - Guy Lenaers
- PREMMI, Mitochondrial Medicine Research Centre, Université d'Angers, CHU Bât IRIS/IBS, Rue des Capucins, 49933, Angers Cedex 9, France
| | - Abdelhamid Barakat
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, 1, Place Louis Pasteur, 20360, Casablanca, Morocco.
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15
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Ghasemnejad T, Shekari Khaniani M, Zarei F, Farbodnia M, Mansoori Derakhshan S. An update of common autosomal recessive non-syndromic hearing loss genes in Iranian population. Int J Pediatr Otorhinolaryngol 2017; 97:113-126. [PMID: 28483220 DOI: 10.1016/j.ijporl.2017.04.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Revised: 04/03/2017] [Accepted: 04/04/2017] [Indexed: 11/16/2022]
Abstract
Autosomal-recessive genes are responsible for about 80% of the hereditary non-syndromic hearing loss (NSHL) cases. In Iran, due to consanguineous marriages, NSHL is the second most frequent disability after intellectual disability, occurring one in 16 individuals. Enormous heterogeneity in the genetic pathology of hearing loss causes a major challenge in identification of responsible genes. In Iran, GJB2 is responsible for the most cases of pre-lingual and non-syndromic hearing loss (with frequency of 16.7%) which followed by other genes with lower frequency. Although several studies have indicated that a large proportion of both syndromic and non-syndromic hearing loss in Iranian populations are caused by defects in just a few genes, new detection strategies such as NGS (Next-generation sequencing) have increased the spectrum of responsible mutations. However, by applying this technique in Iran patients screening, the role of lots of novel related genes have been reported. In this review, we aim to describe function of these genes and their contribution to non-syndromic genetic hearing loss in Iranian population and we classify the genes by their functions.
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Affiliation(s)
- Tohid Ghasemnejad
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Medical Genetic, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Fatemeh Zarei
- Department of Stem Cells and Developmental Biology at Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Mina Farbodnia
- Department of Cellular and Molecular Biology, Faculty of Sciences, Saba University, Urmia, Iran
| | - Sima Mansoori Derakhshan
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Medical Genetic, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
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16
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Bakhchane A, Charif M, Bousfiha A, Boulouiz R, Nahili H, Rouba H, Charoute H, Lenaers G, Barakat A. Novel compound heterozygous MYO7A mutations in Moroccan families with autosomal recessive non-syndromic hearing loss. PLoS One 2017; 12:e0176516. [PMID: 28472130 PMCID: PMC5417485 DOI: 10.1371/journal.pone.0176516] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 04/12/2017] [Indexed: 12/12/2022] Open
Abstract
The MYO7A gene encodes a protein belonging to the unconventional myosin super family. Mutations within MYO7A can lead to either non syndromic hearing loss or to the Usher syndrome type 1B (USH1B). Here, we report the results of genetic analyses performed on Moroccan families with autosomal recessive non syndromic hearing loss that identified two families with compound heterozygous MYO7A mutations. Five mutations (c.6025delG, c.6229T>A, c.3500T>A, c.5617C>T and c.4487C>A) were identified in these families, the latter presenting two differently affected branches. Multiple bioinformatics programs and molecular modelling predicted the pathogenic effect of these mutations. In conclusion, the absence of vestibular and retinal symptom in the affected patients suggests that these families have the isolated non-syndromic hearing loss DFNB2 (nonsyndromic autosomal recessive hearing loss) presentation, instead of USH1B.
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Affiliation(s)
- Amina Bakhchane
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Majida Charif
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
- Equipe MitoLab, INSERM U1083, CNRS 6015, Institut MitoVasc, Université d’Angers, Centre Hospitalier Universitaire d’Angers, Angers, France
| | - Amale Bousfiha
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Redouane Boulouiz
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Halima Nahili
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Hassan Rouba
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Hicham Charoute
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Guy Lenaers
- Equipe MitoLab, INSERM U1083, CNRS 6015, Institut MitoVasc, Université d’Angers, Centre Hospitalier Universitaire d’Angers, Angers, France
| | - Abdelhamid Barakat
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
- * E-mail:
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17
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A novel biallelic splice site mutation of TECTA causes moderate to severe hearing impairment in an Algerian family. Int J Pediatr Otorhinolaryngol 2016; 87:28-33. [PMID: 27368438 DOI: 10.1016/j.ijporl.2016.04.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/25/2016] [Accepted: 04/28/2016] [Indexed: 01/18/2023]
Abstract
Congenital deafness is certainly one of the most common monogenic diseases in humans, but it is also one of the most genetically heterogeneous, which makes molecular diagnosis challenging in most cases. Whole-exome sequencing in two out of three Algerian siblings affected by recessively-inherited, moderate to severe sensorineural deafness allowed us to identify a novel splice donor site mutation (c.5272+1G > A) in the gene encoding α-tectorin, a major component of the cochlear tectorial membrane. The mutation was present at the homozygous state in the three affected siblings, and at the heterozygous state in their unaffected, consanguineous parents. To our knowledge, this is the first reported TECTA mutation leading to the DFNB21 form of hearing impairment among Maghrebian individuals suffering from congenital hearing impairment, which further illustrates the diversity of the genes involved in congenital deafness in the Maghreb.
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18
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Etiology and associated GJB2 mutations in Mauritanian children with non-syndromic hearing loss. Eur Arch Otorhinolaryngol 2016; 273:3693-3698. [PMID: 27067584 DOI: 10.1007/s00405-016-4036-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 04/06/2016] [Indexed: 01/23/2023]
Abstract
Origins of all hearing impairment forms may be divided into genetic mutations and acquired influence. Both carry damage to the inner ear structure resulting in a mild to profound dysfunction of the auditory system. The purpose of this study was to assess the different etiologies of deafness in two reference centers for hearing-impaired children in Nouakchott/Mauritania. Data on gender, age, consanguinity, etiology and family history of deafness were gathered by interviewing the custodians of 139 children with hearing loss. DNA of pupils with hereditary non-syndromic deafness was then screened for GJB2 mutations by sequencing methods. Postnatal hearing loss was found in 36 (25.8 %) out of the 139 children surveyed. The main etiologies of this group were infections caused by meningitis (12.9 %) and measles (2.8 %). Unknown and ototoxic origins accounted for, respectively, 5.7 and 3.5 %. In 103 (74.1 %) children, deafness was identified near after the time of birth and, therefore, presumed as congenital. 56.8 % of deaf children had consanguineous parents. Two GJB2 mutations, c.del35G with an allele frequency of 4.7 % and R32C (3.7 %) were detected. Infections such as meningitis and measles were the most prevalent causes of postnatal deafness. In cases of congenital hearing impairment, two GJB2 allele variants, i.e., del35G and R32C (3.7 %) were detected. Extended genetic testing is recommended for a more comprehensive determination of congenital causes.
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19
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A novel mutation in the TMC1 gene causes non-syndromic hearing loss in a Moroccan family. Gene 2015; 574:28-33. [PMID: 26226225 DOI: 10.1016/j.gene.2015.07.075] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 06/29/2015] [Accepted: 07/22/2015] [Indexed: 01/28/2023]
Abstract
Autosomal recessive non-syndromic hearing loss (ARNSHL) is one of the most common genetic diseases in human and is subject to important genetic heterogeneity, rendering molecular diagnosis difficult. Whole-exome sequencing is thus a powerful strategy for this purpose. After excluding GJB2 mutation and other common mutations associated with hearing loss in Morocco, whole-exome sequencing was performed to study the genetic causes of one sibling with ARSHNL in a consanguineous Moroccan family. After filtering data and Sanger sequencing validation, one novel pathogenic homozygous mutation c.1810C>G (p.Arg604Gly) was identified in TMC1, a gene reported to cause deafness in various populations. Thus, we identified here the first mutation in the TMC1 gene in the Moroccan population causing non-syndromic hearing loss.
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20
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Ichinose A, Moteki H, Hattori M, Nishio SY, Usami SI. Novel mutations in LRTOMT associated with moderate progressive hearing loss in autosomal recessive inheritance. Ann Otol Rhinol Laryngol 2015; 124 Suppl 1:142S-7S. [PMID: 25788562 DOI: 10.1177/0003489415575043] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE We present a patient who was identified with novel mutations in the LRTOMT gene and describe the clinical features of the phenotype including serial audiological findings. METHODS One hundred six Japanese patients with mild to moderate sensorineural hearing loss from unrelated and nonconsanguineous families were enrolled in the study. Targeted genomic enrichment and massively parallel sequencing of all known nonsyndromic hearing loss genes were performed to identify the genetic cause of hearing loss. RESULTS Compound heterozygotes with a novel frame-shift mutation and a missense mutation were identified in the LRTOMT gene. The mutated residues were segregated in both alleles of LRTOMT, present within the LRTOMT2 protein coding region. The patient had moderate sloping hearing loss at high frequencies, which progressed at 1000 Hz and higher frequencies over a period of 6 years. CONCLUSION Hearing loss caused by mutations in the LRTOMT gene is extremely rare. This is the first case report of a compound heterozygous mutation in a nonconsanguineous family.
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Affiliation(s)
- Aya Ichinose
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Hideaki Moteki
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
| | - Mitsuru Hattori
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Shin-Ya Nishio
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
| | - Shin-Ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
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21
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Chakchouk I, Ben Said M, Jbeli F, Benmarzoug R, Loukil S, Smeti I, Chakroun A, Gibriel AA, Ghorbel A, Hadjkacem H, Masmoudi S. NADf chip, a two-color microarray for simultaneous screening of multigene mutations associated with hearing impairment in North African Mediterranean countries. J Mol Diagn 2015; 17:155-61. [PMID: 25560255 DOI: 10.1016/j.jmoldx.2014.11.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2014] [Revised: 10/10/2014] [Accepted: 11/18/2014] [Indexed: 11/20/2022] Open
Abstract
Hearing impairment (HI) is the most frequent sensory defect. Genetic causes are involved in two thirds of prelingual cases. Moreover, the autosomal recessive HI frequency is increased in countries where there is a high rate of consanguinity, such as in North African Mediterranean countries. This population shares several features, including history and social behavior, that promote the spread of founder mutations. HI is characterized by tremendous heterogeneity in both the genetic and clinical aspects. The identification of the causal mutation is important for early diagnosis, clinical follow-up, and genetic counseling. Addressing the extreme genetic heterogeneity of HI using classic molecular methods would be expensive and time-consuming. We designed a cost-effective North African Deafness chip for rapid and simultaneous analysis of 58 mutations using multiplex PCR coupled with dual-color arrayed primer extension. These mutations are found in North African HI patients and are distributed over 31 exons and five introns in 21 distinct genes. Assay specificity was initially optimized using 103 archived DNA samples of known genotypes. Blind validation of HI-unrelated patients revealed mutant alleles in 13 samples, and these mutations were confirmed by Sanger sequencing. The North African Deafness chip allows for simultaneous genotyping of eight different samples, at a minimal cost and in a single day, and is therefore amenable to large-scale molecular screening of HI in North Africa.
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Affiliation(s)
- Imen Chakchouk
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Mariem Ben Said
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Fida Jbeli
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Riadh Benmarzoug
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Salma Loukil
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Ibtihel Smeti
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Amine Chakroun
- Otorhinolaryngology Service, Habib Bourguiba University Hospital Sfax, Sfax, Tunisia
| | - Abdullah Ahmed Gibriel
- Department of Biochemistry and Molecular Biology, Faculty of Pharmacy, Ahram Canadian University, Giza, Egypt; Department of Biochemistry and Molecular Biology, Faculty of Pharmacy, British University in Egypt, Cairo, Egypt
| | - Abdelmonem Ghorbel
- Otorhinolaryngology Service, Habib Bourguiba University Hospital Sfax, Sfax, Tunisia
| | - Hassen Hadjkacem
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Saber Masmoudi
- Processes Laboratory of Molecular and Cellular Screening, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia.
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22
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Riahi Z, Bonnet C, Zainine R, Louha M, Bouyacoub Y, Laroussi N, Chargui M, Kefi R, Jonard L, Dorboz I, Hardelin JP, Salah SB, Levilliers J, Weil D, McElreavey K, Boespflug OT, Besbes G, Abdelhak S, Petit C. Whole exome sequencing identifies new causative mutations in Tunisian families with non-syndromic deafness. PLoS One 2014; 9:e99797. [PMID: 24926664 PMCID: PMC4057390 DOI: 10.1371/journal.pone.0099797] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 05/17/2014] [Indexed: 11/29/2022] Open
Abstract
Identification of the causative mutations in patients affected by autosomal recessive non syndromic deafness (DFNB forms), is demanding due to genetic heterogeneity. After the exclusion of GJB2 mutations and other mutations previously reported in Tunisian deaf patients, we performed whole exome sequencing in patients affected with severe to profound deafness, from four unrelated consanguineous Tunisian families. Four biallelic non previously reported mutations were identified in three different genes: a nonsense mutation, c.208C>T (p.R70X), in LRTOMT, a missense mutation, c.5417T>C (p.L1806P), in MYO15A and two splice site mutations, c.7395+3G>A, and c.2260+2T>A, in MYO15A and TMC1 respectively. We thereby provide evidence that whole exome sequencing is a powerful, cost-effective screening tool to identify mutations causing recessive deafness in consanguineous families.
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Affiliation(s)
- Zied Riahi
- Laboratoire de Génomique Biomédicale et Oncogénétique, Institut Pasteur de Tunis, Tunis, Tunisia
- Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | | | - Rim Zainine
- Service d'ORL et de Chirurgie Maxillo-faciale, CHU La Rabta, Tunis, Tunisia
| | - Malek Louha
- Centre de Référence des Surdités Génétiques, Hôpital Trousseau- APHP, Paris, France
| | - Yosra Bouyacoub
- Laboratoire de Génomique Biomédicale et Oncogénétique, Institut Pasteur de Tunis, Tunis, Tunisia
| | - Nadia Laroussi
- Laboratoire de Génomique Biomédicale et Oncogénétique, Institut Pasteur de Tunis, Tunis, Tunisia
- Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Mariem Chargui
- Laboratoire de Génomique Biomédicale et Oncogénétique, Institut Pasteur de Tunis, Tunis, Tunisia
| | - Rym Kefi
- Laboratoire de Génomique Biomédicale et Oncogénétique, Institut Pasteur de Tunis, Tunis, Tunisia
| | - Laurence Jonard
- Centre de Référence des Surdités Génétiques, Hôpital Trousseau- APHP, Paris, France
| | | | - Jean-Pierre Hardelin
- Unité de Génétique et Physiologie de l'Audition, Institut Pasteur de Paris, Paris, France
| | - Sihem Belhaj Salah
- Service d'ORL et de Chirurgie Maxillo-faciale, CHU La Rabta, Tunis, Tunisia
| | - Jacqueline Levilliers
- Unité de Génétique et Physiologie de l'Audition, Institut Pasteur de Paris, Paris, France
| | - Dominique Weil
- Unité de Génétique et Physiologie de l'Audition, Institut Pasteur de Paris, Paris, France
| | - Kenneth McElreavey
- Unité de Génétique du Développement Humain, Institut Pasteur de Paris, Paris, France
| | | | - Ghazi Besbes
- Service d'ORL et de Chirurgie Maxillo-faciale, CHU La Rabta, Tunis, Tunisia
| | - Sonia Abdelhak
- Laboratoire de Génomique Biomédicale et Oncogénétique, Institut Pasteur de Tunis, Tunis, Tunisia
- Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisia
- * E-mail:
| | - Christine Petit
- INSERM UMRS 1120, Institut de la Vision, Paris, France
- Unité de Génétique et Physiologie de l'Audition, Institut Pasteur de Paris, Paris, France
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