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Park JH, Sahbaz BD, Pekhale K, Chu X, Okur MN, Grati M, Isgrig K, Chien W, Chrysostomou E, Sullivan L, Croteau DL, Manor U, Bohr VA. Early-Onset Hearing Loss in Mouse Models of Alzheimer's Disease and Increased DNA Damage in the Cochlea. Aging Biol 2024; 1:20240025. [PMID: 38500536 PMCID: PMC10948084 DOI: 10.59368/agingbio.20240025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
There is considerable interest in whether sensory deficiency is associated with the development of Alzheimer's disease (AD). Notably, the relationship between hearing impairment and AD is of high relevance but still poorly understood. In this study, we found early-onset hearing loss in two AD mouse models, 3xTgAD and 3xTgAD/Polβ+/-. The 3xTgAD/Polβ+/- mouse is DNA repair deficient and has more humanized AD features than the 3xTgAD. Both AD mouse models showed increased auditory brainstem response (ABR) thresholds between 16 and 32 kHz at 4 weeks of age, much earlier than any AD cognitive and behavioral changes. The ABR thresholds were significantly higher in 3xTgAD/Polβ+/- mice than in 3xTgAD mice at 16 kHz, and distortion product otoacoustic emission signals were reduced, indicating that DNA damage may be a factor underlying early hearing impairment in AD. Poly ADP-ribosylation and protein expression levels of DNA damage markers increased significantly in the cochlea of the AD mice but not in the adjacent auditory cortex. Phosphoglycerate mutase 2 levels and the number of synaptic ribbons in the presynaptic zones of inner hair cells were decreased in the cochlea of the AD mice. Furthermore, the activity of sirtuin 3 was downregulated in the cochlea of these mice, indicative of impaired mitochondrial function. Taken together, these findings provide new insights into potential mechanisms for hearing dysfunction in AD and suggest that DNA damage in the cochlea might contribute to the development of early hearing loss in AD.
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Affiliation(s)
- Jae-Hyeon Park
- DNA repair Section, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Burcin Duan Sahbaz
- DNA repair Section, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Komal Pekhale
- DNA repair Section, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Xixia Chu
- DNA repair Section, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Mustafa N. Okur
- DNA repair Section, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Mhamed Grati
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Kevin Isgrig
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Wade Chien
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
- Department of Otolaryngology-Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Elena Chrysostomou
- Waitt Advanced Biophotonics Center, Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Lauren Sullivan
- Department of Cell & Developmental Biology School of Biological Sciences University of California, San Diego, La Jolla, CA, USA
| | - Deborah L. Croteau
- DNA repair Section, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
- Computational Biology & Genomics Core, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Uri Manor
- Department of Cell & Developmental Biology School of Biological Sciences University of California, San Diego, La Jolla, CA, USA
| | - Vilhelm A. Bohr
- DNA repair Section, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
- Danish Center for Healthy Aging, University of Copenhagen, Copenhagen N, Denmark
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2
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Lau SC, Grati M, Isgrig K, Sinan M, Calabro KR, Zhu J, Ishibashi Y, Ozgur Z, Wafa T, Belyantseva IA, Fitzgerald T, Friedman TB, Boye SL, Boye SE, Chien WW. Dual-AAV vector-mediated expression of MYO7A improves vestibular function in a mouse model of Usher syndrome 1B. Mol Ther Methods Clin Dev 2023; 30:534-545. [PMID: 37693946 PMCID: PMC10491803 DOI: 10.1016/j.omtm.2023.08.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 08/16/2023] [Indexed: 09/12/2023]
Abstract
Usher syndrome is the most common cause of deafness-blindness in the world. Usher syndrome type 1B (USH1B) is associated with mutations in MYO7A. Patients with USH1B experience deafness, blindness, and vestibular dysfunction. In this study, we applied adeno-associated virus (AAV)-mediated gene therapy to the shaker-1 (Myo7a4626SB/4626SB) mouse, a model of USH1B. The shaker-1 mouse has a nonsense mutation in Myo7a, is profoundly deaf throughout life, and has significant vestibular dysfunction. Because of the ∼6.7-kb size of the MYO7A cDNA, a dual-AAV approach was used for gene delivery, which involves splitting human MYO7A cDNA into 5' and 3' halves and cloning them into two separate AAV8(Y733F) vectors. When MYO7A cDNA was delivered to shaker-1 inner ears using the dual-AAV approach, cochlear hair cell survival was improved. However, stereocilium organization and auditory function were not improved. In contrast, in the vestibular system, dual-AAV-mediated MYO7A delivery significantly rescued hair cell stereocilium morphology and improved vestibular function, as reflected in a reduction of circling behavior and improved vestibular sensory-evoked potential (VsEP) thresholds. Our data indicate that dual-AAV-mediated MYO7A expression improves vestibular function in shaker-1 mice and supports further development of this approach for the treatment of disabling dizziness from vestibular dysfunction in USH1B patients.
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Affiliation(s)
- Samantha C. Lau
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Mhamed Grati
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Kevin Isgrig
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Moaz Sinan
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Kaitlyn R. Calabro
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida, Gainesville, FL, USA
| | - Jianliang Zhu
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Yasuko Ishibashi
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Zeynep Ozgur
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Talah Wafa
- Mouse Auditory Testing Core Facility, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Inna A. Belyantseva
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Tracy Fitzgerald
- Mouse Auditory Testing Core Facility, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Thomas B. Friedman
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
| | - Sanford L. Boye
- Powell Gene Therapy Center, Department of Pediatrics, University of Florida, Gainesville, FL, USA
| | - Shannon E. Boye
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida, Gainesville, FL, USA
| | - Wade W. Chien
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA
- Department of Otolaryngology – Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA
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Isgrig K, Cartagena-Rivera AX, Wang HJ, Grati M, Fernandez KA, Friedman TB, Belyantseva IA, Chien W. Combined AAV-mediated gene replacement therapy improves auditory function in a mouse model of human DFNB42 deafness. Mol Ther 2023; 31:2783-2795. [PMID: 37481704 PMCID: PMC10492026 DOI: 10.1016/j.ymthe.2023.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 05/30/2023] [Accepted: 07/19/2023] [Indexed: 07/24/2023] Open
Abstract
Hearing loss is a common disorder affecting nearly 20% of the world's population. Recently, studies have shown that inner ear gene therapy can improve auditory function in several mouse models of hereditary hearing loss. In most of these studies, the underlying mutations affect only a small number of cell types of the inner ear (e.g., sensory hair cells). Here, we applied inner ear gene therapy to the Ildr1Gt(D178D03)Wrst (Ildr1w-/-) mouse, a model of human DFNB42, non-syndromic autosomal recessive hereditary hearing loss associated with ILDR1 variants. ILDR1 is an integral protein of the tricellular tight junction complex and is expressed by diverse inner ear cell types in the organ of Corti and the cochlear lateral wall. We simultaneously applied two synthetic adeno-associated viruses (AAVs) with different tropism to deliver Ildr1 cDNA to the Ildr1w-/- mouse inner ear: one targeting the organ of Corti (AAV2.7m8) and the other targeting the cochlear lateral wall (AAV8BP2). We showed that combined AAV2.7m8/AAV8BP2 gene therapy improves cochlear structural integrity and auditory function in Ildr1w-/- mice.
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Affiliation(s)
- Kevin Isgrig
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Alexander X Cartagena-Rivera
- Section on Mechanobiology, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
| | - Hong Jun Wang
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Mhamed Grati
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Katharine A Fernandez
- Section on Sensory Cell Biology, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Thomas B Friedman
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Inna A Belyantseva
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA
| | - Wade Chien
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, USA; Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA.
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Ishibashi Y, Sung CYW, Grati M, Chien W. Immune responses in the mammalian inner ear and their implications for AAV-mediated inner ear gene therapy. Hear Res 2023; 432:108735. [PMID: 36965335 DOI: 10.1016/j.heares.2023.108735] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 02/17/2023] [Accepted: 03/04/2023] [Indexed: 03/13/2023]
Abstract
Adeno-associated virus (AAV)-mediated inner ear gene therapy is a promising treatment option for hearing loss and dizziness. Several studies have shown that AAV-mediated inner ear gene therapy can be applied to various mouse models of hereditary hearing loss to improve their auditory function. Despite the increase in AAV-based animal and clinical studies aiming to rescue auditory and vestibular functions, little is currently known about the host immune responses to AAV in the mammalian inner ear. It has been reported that the host immune response plays an important role in the safety and efficacy of viral-mediated gene therapy. Therefore, in order for AAV-mediated gene therapy to be successfully and safely translated into patients with hearing loss and dizziness, a better understanding of the host immune responses to AAV in the inner ear is critical. In this review, we summarize the current knowledge on host immune responses to AAV-mediated gene therapy in the mammalian inner ear and other organ systems. We also outline the areas of research that are critical for ensuring the safety and efficacy of AAV-mediated inner ear gene therapy in future clinical and translational studies.
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Affiliation(s)
- Yasuko Ishibashi
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, 35A 1F220, 35A Covent Dr., Bethesda, MD 20892, USA; Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Cathy Yea Won Sung
- Laboratory of Hearing Biology and Therapeutics, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Mhamed Grati
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, 35A 1F220, 35A Covent Dr., Bethesda, MD 20892, USA
| | - Wade Chien
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, 35A 1F220, 35A Covent Dr., Bethesda, MD 20892, USA; Department of Otolaryngology-Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA.
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Isgrig K, Ishibashi Y, Lee HJ, Zhu J, Grati M, Bennett J, Griffith AJ, Roux I, Chien WW. AAV8BP2 and AAV8 transduce the mammalian cochlear lateral wall and endolymphatic sac with high efficiency. Mol Ther Methods Clin Dev 2022; 26:371-383. [PMID: 36034771 PMCID: PMC9386391 DOI: 10.1016/j.omtm.2022.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 07/20/2022] [Indexed: 12/04/2022]
Abstract
Inner ear gene therapy using adeno-associated viruses (AAVs) has been successfully applied to several mouse models of hereditary hearing loss to improve their auditory function. While most inner ear gene therapy studies have focused on the mechanosensory hair cells and supporting cells in the organ of Corti, the cochlear lateral wall and the endolymphatic sac have not garnered much attention. The cochlear lateral wall and the endolymphatic sac play critical roles in inner ear ionic and fluid homeostasis. Mutations in genes expressed in the cochlear lateral wall and the endolymphatic sac are present in a large percentage of patients with hereditary hearing loss. In this study, we examine the transduction patterns and efficiencies of conventional (AAV2 and AAV8) and synthetic (AAV2.7m8, AAV8BP2, and Anc80L65) AAVs in the mouse inner ear. We found that AAV8BP2 and AAV8 are capable of transducing the marginal cells and intermediate cells in the stria vascularis. These two AAVs can also transduce the epithelial cells of the endolymphatic sac. Our data suggest that AAV8BP2 and AAV8 are highly useful viral vectors for gene therapy studies targeting the cochlear lateral wall and the endolymphatic sac.
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Affiliation(s)
- Kevin Isgrig
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Yasuko Ishibashi
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Hyun Jae Lee
- Otolaryngology Branch, NIDCD, National Institutes of Health, Bethesda, MD, USA
| | - Jianliang Zhu
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Mhamed Grati
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Jean Bennett
- Center for Advanced Retinal and Ocular Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Andrew J. Griffith
- Otolaryngology Branch, NIDCD, National Institutes of Health, Bethesda, MD, USA
- Department of Otolaryngology, University of Tennessee College of Medicine, Memphis, TN, USA
| | - Isabelle Roux
- Otolaryngology Branch, NIDCD, National Institutes of Health, Bethesda, MD, USA
| | - Wade W. Chien
- Inner Ear Gene Therapy Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA
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Zhu J, Choi JW, Ishibashi Y, Isgrig K, Grati M, Bennett J, Chien W. Refining surgical techniques for efficient posterior semicircular canal gene delivery in the adult mammalian inner ear with minimal hearing loss. Sci Rep 2021; 11:18856. [PMID: 34552193 PMCID: PMC8458342 DOI: 10.1038/s41598-021-98412-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 05/10/2021] [Indexed: 11/28/2022] Open
Abstract
Hearing loss is a common disability affecting the world's population today. While several studies have shown that inner ear gene therapy can be successfully applied to mouse models of hereditary hearing loss to improve hearing, most of these studies rely on inner ear gene delivery in the neonatal age, when mouse inner ear has not fully developed. However, the human inner ear is fully developed at birth. Therefore, in order for inner ear gene therapy to be successfully applied in patients with hearing loss, one must demonstrate that gene delivery can be safely and reliably performed in the mature mammalian inner ear. In this study, we examine the steps involved in posterior semicircular canal gene delivery in the adult mouse inner ear. We find that the duration of perilymphatic leakage and injection rate have a significant effect on the post-surgical hearing outcome. Our results show that although AAV2.7m8 has a lower hair cell transduction rate in adult mice compared to neonatal mice at equivalent viral load, AAV2.7m8 is capable of transducing the adult mouse inner and outer hair cells with high efficiency in a dose-dependent manner.
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Affiliation(s)
- Jianliang Zhu
- Inner Ear Gene Therapy Program, National Institute On Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Jin Woong Choi
- Inner Ear Gene Therapy Program, National Institute On Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
- Department of Otorhinolaryngology-Head and Neck Surgery, Chungnam National University, College of Medicine, Daejeon, South Korea
| | - Yasuko Ishibashi
- Inner Ear Gene Therapy Program, National Institute On Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Kevin Isgrig
- Inner Ear Gene Therapy Program, National Institute On Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Mhamed Grati
- Inner Ear Gene Therapy Program, National Institute On Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA
| | - Jean Bennett
- Center for Advanced Retinal and Ocular Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Wade Chien
- Inner Ear Gene Therapy Program, National Institute On Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, MD, USA.
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA.
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Bouzid A, Smeti I, Chakroun A, Loukil S, Gibriel AA, Grati M, Ghorbel A, Masmoudi S. CDH23 Methylation Status and Presbycusis Risk in Elderly Women. Front Aging Neurosci 2018; 10:241. [PMID: 30131691 PMCID: PMC6090039 DOI: 10.3389/fnagi.2018.00241] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 04/07/2018] [Accepted: 07/23/2018] [Indexed: 01/15/2023] Open
Abstract
Introduction: Presbycusis, an age-related hearing impairment (ARHI) disease, is the most common cause for HI in adults worldwide. One of the best candidate genes for ARHI susceptibility is Cadherin 23 (CDH23) which encodes stereocilia tip-links of the inner ear sensory hair cell. Although alterations in the methylation status of CpG dinucleotides across various genes were reported to be associated with HI, methylation changes in CDH23 gene have not been reported previously. Objectives: This study aimed at investigating whether DNA methylation level of CDH23 gene at intragenic CpG island overlapping an exonic-intronic region at position chr10:73565570-73565827 (GRCh37/hg19) could be risk factor associated with ARHI. Materials and Methods: We screened for methylation changes in this particular position for CDH23 gene in 50 blood samples of elderly women affected with presbycusis and healthy control cohort. Methylation of CpG sites were assessed using Quantitative methylation-specific PCR (qMSP) following sodium bisulfite DNA conversion chemistry. Methylation levels were normalized against TSH2B reference gene. Results: DNA methylation analysis for the common CpG islands in CDH23 gene revealed 3.27-folds significant increase (p < 0.0001) in methylation profile for ARHI women as compared to healthy controls with an elevated risk odds ratio (OR) of 2.219 [95% CI 1.071–4.597]. Conclusion: Our study is the first of its kind to prove that higher CpG site methylation levels in CDH23 gene are likely to be associated with ARHI.
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Affiliation(s)
- Amal Bouzid
- Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, Sfax, Tunisia
| | - Ibtihel Smeti
- Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, Sfax, Tunisia
| | - Amine Chakroun
- Department of Otorhinolaryngology, Habib Bourguiba Teaching Hospital, University of Sfax, Sfax, Tunisia.,Unité de Recherche Surdité et Cancer du Cavum, UR12ES21, Faculté de Médecine, Université de Sfax, Sfax, Tunisia
| | - Salma Loukil
- Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, Sfax, Tunisia
| | - Abdullah Ahmed Gibriel
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, The British University in Egypt (BUE), Cairo, Egypt
| | - Mhamed Grati
- Department of Otolaryngology, University of Miami, Miller School of Medicine, Miami, FL, United States
| | - Abdelmonem Ghorbel
- Department of Otorhinolaryngology, Habib Bourguiba Teaching Hospital, University of Sfax, Sfax, Tunisia.,Unité de Recherche Surdité et Cancer du Cavum, UR12ES21, Faculté de Médecine, Université de Sfax, Sfax, Tunisia
| | - Saber Masmoudi
- Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, Sfax, Tunisia
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Ben-Rebeh I, Grati M, Bonnet C, Bouassida W, Hadjamor I, Ayadi H, Ghorbel A, Petit C, Masmoudi S. Genetic analysis of Tunisian families with Usher syndrome type 1: toward improving early molecular diagnosis. Mol Vis 2016; 22:827-35. [PMID: 27440999 PMCID: PMC4950652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 07/16/2016] [Indexed: 10/26/2022] Open
Abstract
PURPOSE Usher syndrome accounts for about 50% of all hereditary deaf-blindness cases. The most severe form of this syndrome, Usher syndrome type I (USH1), is characterized by profound congenital sensorineural deafness, vestibular dysfunction, and retinitis pigmentosa. Six USH1 genes have been identified, MYO7A, CDH23, PCDH15, USH1C, SANS, and CIB2, encoding myosin VIIA, cadherin-23, protocadherin-15, harmonin, scaffold protein containing ankyrin repeats and a sterile alpha motif (SAM) domain, and calcium- and integrin-binding member 2, respectively. METHODS In the present study, we recruited four Tunisian families with a diagnosis of USH1, together with healthy unrelated controls. Affected members underwent detailed audiologic and ocular examinations. We used the North African Deafness (NADf) chip to search for known North African mutations associated with USH. Then, we selected microsatellite markers covering USH1 known loci to genotype the DNA samples. Finally, we performed DNA sequencing of three known USH1 genes: MYO7A, PCDH15, and USH1C. RESULTS Four biallelic mutations, all single base changes, were found in the MYO7A, USH1C, and PCDH15 genes. These mutations consist of a previously reported splicing defect c.470+1G>A in MYO7A, three novel variants, including two nonsense (p.Arg3X and p.Arg134X) in USH1C and PCDH15, respectively, and one frameshift (p.Lys615Asnfs*6) in MYO7A. CONCLUSIONS We found a remarkable genetic heterogeneity in the studied families with USH1 with a variety of mutations, among which three were novel. These novel mutations will be included in the NADf mutation screening chip that will allow a higher diagnosis efficiency of this extremely genetically heterogeneous disease. Ultimately, efficient molecular diagnosis of USH in a patient's early childhood is of utmost importance, allowing better educational and therapeutic management.
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Affiliation(s)
- Imen Ben-Rebeh
- Laboratoire de Procédés de criblage moléculaire et cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Tunisie
| | - Mhamed Grati
- Unité de Génétique et Physiologie de l’Audition, INSERM UMRS 1120, Institut Pasteur, Paris, France
| | | | - Walid Bouassida
- Service d’Ophtalmologie, C.H.U. H. Bourguiba de Sfax, Tunisie
| | - Imen Hadjamor
- Laboratoire de Procédés de criblage moléculaire et cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Tunisie
| | - Hammadi Ayadi
- Laboratoire de Procédés de criblage moléculaire et cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Tunisie
| | | | - Christine Petit
- Unité de Génétique et Physiologie de l’Audition, INSERM UMRS 1120, Institut Pasteur, Paris, France,INSERM UMRS 1120, Institut de la Vision, Paris, France,Collège de France, Paris, France
| | - Saber Masmoudi
- Laboratoire de Procédés de criblage moléculaire et cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Tunisie
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Yan D, Tekin D, Bademci G, Foster J, Cengiz FB, Kannan-Sundhari A, Guo S, Mittal R, Zou B, Grati M, Kabahuma RI, Kameswaran M, Lasisi TJ, Adedeji WA, Lasisi AO, Menendez I, Herrera M, Carranza C, Maroofian R, Crosby AH, Bensaid M, Masmoudi S, Behnam M, Mojarrad M, Feng Y, Duman D, Mawla AM, Nord AS, Blanton SH, Liu XZ, Tekin M. Spectrum of DNA variants for non-syndromic deafness in a large cohort from multiple continents. Hum Genet 2016; 135:953-61. [PMID: 27344577 PMCID: PMC5497215 DOI: 10.1007/s00439-016-1697-z] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 06/11/2016] [Indexed: 12/21/2022]
Abstract
Hearing loss is the most common sensory deficit in humans with causative variants in over 140 genes. With few exceptions, however, the population-specific distribution for many of the identified variants/genes is unclear. Until recently, the extensive genetic and clinical heterogeneity of deafness precluded comprehensive genetic analysis. Here, using a custom capture panel (MiamiOtoGenes), we undertook a targeted sequencing of 180 genes in a multi-ethnic cohort of 342 GJB2 mutation-negative deaf probands from South Africa, Nigeria, Tunisia, Turkey, Iran, India, Guatemala, and the United States (South Florida). We detected causative DNA variants in 25 % of multiplex and 7 % of simplex families. The detection rate varied between 0 and 57 % based on ethnicity, with Guatemala and Iran at the lower and higher end of the spectrum, respectively. We detected causative variants within 27 genes without predominant recurring pathogenic variants. The most commonly implicated genes include MYO15A, SLC26A4, USH2A, MYO7A, MYO6, and TRIOBP. Overall, our study highlights the importance of family history and generation of databases for multiple ethnically discrete populations to improve our ability to detect and accurately interpret genetic variants for pathogenicity.
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Affiliation(s)
- Denise Yan
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA
| | - Demet Tekin
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA
| | - Guney Bademci
- Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA
| | - Joseph Foster
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA.,Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA
| | - F Basak Cengiz
- Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA
| | - Abhiraami Kannan-Sundhari
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA
| | - Shengru Guo
- Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA
| | - Rahul Mittal
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA
| | - Bing Zou
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA
| | - Mhamed Grati
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA
| | - Rosemary I Kabahuma
- Department of Otorhinolaryngology, Steve Biko Academic Hospital, University of Pretoria, Cnr Malan and Steve Biko Road, Gezina, Pretoria, South Africa
| | - Mohan Kameswaran
- Madras ENT Research Foundation (MERF), No-1, 1st Cross Street, Off. II Main Road, Raja Annamalai Puram, Chennai, 600028, Tamil Nadu, India
| | - Taye J Lasisi
- Department of Otorhinolaryngology, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Waheed A Adedeji
- Department of Otorhinolaryngology, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Akeem O Lasisi
- Department of Otorhinolaryngology, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Ibis Menendez
- Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA
| | - Marianna Herrera
- Institute for Research on Genetic and Metabolic Diseases, INVEGEM, Guatemala City, Guatemala
| | - Claudia Carranza
- Institute for Research on Genetic and Metabolic Diseases, INVEGEM, Guatemala City, Guatemala
| | - Reza Maroofian
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, RILD Wellcome Wolfson Centre, Exeter, UK
| | - Andrew H Crosby
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, RILD Wellcome Wolfson Centre, Exeter, UK
| | - Mariem Bensaid
- Laboratoire Procédés de Criblage Moléculaire et Cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisia
| | - Saber Masmoudi
- Laboratoire Procédés de Criblage Moléculaire et Cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisia
| | | | - Majid Mojarrad
- Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Yong Feng
- Department of Otolaryngology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Duygu Duman
- Division of Genetics, Department of Pediatrics, Ankara University School of Medicine, Ankara, Turkey
| | - Alex M Mawla
- Department of Neurobiology, Physiology, and Behavior, Center for Neuroscience, UC Davis, Davis, CA, 95616, USA.,Department of Psychiatry and Behavioral Sciences, Center for Neuroscience, UC Davis, Davis, CA, 95616, USA
| | - Alex S Nord
- Department of Neurobiology, Physiology, and Behavior, Center for Neuroscience, UC Davis, Davis, CA, 95616, USA.,Department of Psychiatry and Behavioral Sciences, Center for Neuroscience, UC Davis, Davis, CA, 95616, USA
| | - Susan H Blanton
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA.,Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA.,Dr. John T. Macdonald Department of Human Genetics, University of Miami Miller School of Medicine, Miami, FL, 33136, USA
| | - Xue Z Liu
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA. .,Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA. .,Department of Otolaryngology, Xiangya Hospital, Central South University, Changsha, Hunan, China.
| | - Mustafa Tekin
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, 1666 NW 12th Avenue, Miami, FL, 33136, USA. .,Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami, 1501 NW 10th Avenue, BRB-610 (M-860), Miami, FL, 33136, USA. .,Dr. John T. Macdonald Department of Human Genetics, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
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10
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Ma Q, Grati M, Bai F, Pei J, Pei XH, Liu X. Rescue from early-onset hearing loss in a mouse model lacking the cyclin-dependent kinase inhibitor p19Ink4d. Cell Death Dis 2016; 7:e2131. [PMID: 26962681 PMCID: PMC4823939 DOI: 10.1038/cddis.2016.38] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Q Ma
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, Miami, FL, USA
| | - M Grati
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, Miami, FL, USA
| | - F Bai
- Molecular Oncology Program, Department of Surgery, University of Miami Miller School of Medicine, Miami, FL, USA
| | - J Pei
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, Miami, FL, USA
| | - X-H Pei
- Molecular Oncology Program, Department of Surgery, University of Miami Miller School of Medicine, Miami, FL, USA
| | - X Liu
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, Miami, FL, USA.,Department of Otolaryngology, Xiangya Hospital, Central South University, Changsha, China
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11
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Wang H, Wang X, He C, Li H, Qing J, Grati M, Hu Z, Li J, Hu Y, Xia K, Mei L, Wang X, Yu J, Chen H, Jiang L, Liu Y, Men M, Zhang H, Guan L, Xiao J, Zhang J, Liu X, Feng Y. Exome sequencing identifies a novel CEACAM16 mutation associated with autosomal dominant nonsyndromic hearing loss DFNA4B in a Chinese family. J Hum Genet 2015; 60:119-126. [PMID: 25589040 PMCID: PMC4375019 DOI: 10.1038/jhg.2014.114] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 11/21/2014] [Accepted: 11/25/2014] [Indexed: 12/28/2022]
Abstract
Autosomal dominant nonsyndromic hearing loss (ADNSHL/DFNA) is a highly genetically heterogeneous disorder. Hitherto only about 30 ADNSHL-causing genes have been identified and many unknown genes remain to be discovered. In this research, genome-wide linkage analysis mapped the disease locus to a 4.3 Mb region on chromosome 19q13 in SY-026, a five-generation nonconsanguineous Chinese family affected by late-onset and progressive ADNSHL. This linkage region showed partial overlap with the previously reported DFNA4. Simultaneously, probands were analyzed using exome capture followed by next generation sequencing. Encouragingly, a heterozygous missense mutation, c.505G>A (p.G169R) in exon 3 of the CEACAM16 gene (carcinoembryonic antigen-related cell adhesion molecule 16), was identified via this combined strategy. Sanger sequencing verified that the mutation co-segregated with hearing loss in the family and that it was not present in 200 unrelated control subjects with matched ancestry. This is the second report in the literature of a family with ADNSHL caused by CEACAM16 mutation. Immunofluorescence staining and Western blots also prove CEACAM16 to be a secreted protein. Furthermore, our studies in transfected HEK293T cells show that the secretion efficacy of the mutant CEACAM16 is much lower than that of the wild-type, suggesting a deleterious effect of the sequence variant.
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Affiliation(s)
- Honghan Wang
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Department of Head and Neck Surgery, Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya Medical School, Central South University, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Xinwei Wang
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Chufeng He
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Haibo Li
- State Key Laboratory of Medical Genetics of China, Changsha, Hunan, China
| | - Jie Qing
- Department of Otorhinolaryngology, University of Miami, Miller School of Medicine, Miami, FL, USA
| | - Mhamed Grati
- Department of Otorhinolaryngology, University of Miami, Miller School of Medicine, Miami, FL, USA
| | - Zhengmao Hu
- State Key Laboratory of Medical Genetics of China, Changsha, Hunan, China
| | - Jiada Li
- State Key Laboratory of Medical Genetics of China, Changsha, Hunan, China
| | - Yiqiao Hu
- State Key Laboratory of Medical Genetics of China, Changsha, Hunan, China
| | - Kun Xia
- State Key Laboratory of Medical Genetics of China, Changsha, Hunan, China
| | - Lingyun Mei
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Xingwei Wang
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Jianjun Yu
- Department of Head and Neck Surgery, Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya Medical School, Central South University, Changsha, Hunan, China
| | - Hongsheng Chen
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Lu Jiang
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Yalan Liu
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Meichao Men
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,Health Management Center, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hailin Zhang
- Department of Head and Neck Surgery, Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya Medical School, Central South University, Changsha, Hunan, China
| | | | | | | | - Xuezhong Liu
- Department of Otorhinolaryngology, University of Miami, Miller School of Medicine, Miami, FL, USA
| | - Yong Feng
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.,State Key Laboratory of Medical Genetics of China, Changsha, Hunan, China.,Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
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12
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Jonard L, Feldmann D, Parsy C, Freitag S, Sinico M, Koval C, Grati M, Couderc R, Denoyelle F, Bodemer C, Marlin S, Hadj-Rabia S. A familial case of Keratitis-Ichthyosis-Deafness (KID) syndrome with the GJB2 mutation G45E. Eur J Med Genet 2007; 51:35-43. [PMID: 18024254 DOI: 10.1016/j.ejmg.2007.09.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2007] [Accepted: 09/23/2007] [Indexed: 10/22/2022]
Abstract
Keratitis-Ichthyosis-Deafness (KID) syndrome (OMIM 148210) is a congenital ectodermal defect. KID consists of an atypical ichthyosiform erythroderma associated with congenital sensorineural deafness. A rare form of the KID syndrome is a fatal course in the first year of life due to severe skin lesion infections and septicaemia. KID appears to be genetically heterogeneous and may be caused by mutations in connexin 26 or connexin 30 genes. GJB2 mutations in the connexin 26 gene are the main cause of the disease. Most of the cases caused by GJB2 mutations are sporadic, but dominant transmission has also been described. To date, the rare lethal form of the disease has been only observed in two Caucasian sporadic patients with the GJB2 mutation, with the p.Gly45Glu (G45E) arising de novo. We have reported an African family with dizygotic twins suffering from a lethal form of KID. The dizygosity of the twins was confirmed by microsatellite markers. The two patients were heterozygous for the G45E mutation of GJB2, whereas the mutation was not detected in the two parents. The unusual transmission of the disease observed in this family could be explained by the occurrence of a somatic or more probably a germinal mosaic in one of the parents.
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Affiliation(s)
- Laurence Jonard
- Laboratoire de Biochimie, Inserm U587, Centre de Référence des Surdités Génétiques, Hôpital Armand-Trousseau, AP-HP, 24 av du Dr A Netter, Paris 75012, France
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13
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Masmoudi S, Antonarakis S, Schwede T, Ghorbel A, Grati M, Pappasavas MP, Drira M, Elgaied-Boulila A, Wattenhofer M, Rossier C, Scott H, Ayadi H, Guipponi M. Novel missense mutations of TMPRSS3 in two consanguineous Tunisian families with non-syndromic autosomal recessive deafness. Hum Mutat 2002. [DOI: 10.1002/humu.10048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Affiliation(s)
- S Yasunaga
- Unité de Génétique des Déficits Sensoriels, Institut Pasteur, Paris, France
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15
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Masmoudi S, Charfedine I, Hmani M, Grati M, Ghorbel AM, Elgaied-Boulila A, Drira M, Hardelin JP, Ayadi H. Pendred syndrome: phenotypic variability in two families carrying the same PDS missense mutation. Am J Med Genet 2000; 90:38-44. [PMID: 10602116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Pendred syndrome comprises congenital sensorineural hearing loss, thyroid goiter, and positive perchlorate discharge test. Recently, this autosomal recessive disorder was shown to be caused by mutations in the PDS gene, which encodes an anion transporter called pendrin. Molecular analysis of the PDS gene was performed in two consanguineous large families from Southern Tunisia comprising a total of 23 individuals affected with profound congenital deafness; the same missense mutation, L445W, was identified in all affected individuals. A widened vestibular aqueduct was found in all patients who underwent computed tomography (CT) scan exploration of the inner ear. In contrast, goiter was present in only 11 affected individuals, who interestingly had a normal result of the perchlorate discharge test whenever performed. The present results question the sensitivity of the perchlorate test for the diagnosis of Pendred syndrome and support the use of a molecular analysis of the PDS gene in the assessment of individuals with severe to profound congenital hearing loss associated with inner ear morphological anomaly even in the absence of a thyroid goiter.
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Affiliation(s)
- S Masmoudi
- Laboratoire d'Immunologie et de Biologie Moléculaire, Faculté de Médecine, Sfax, Tunisia
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16
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Yasunaga S, Grati M, Cohen-Salmon M, El-Amraoui A, Mustapha M, Salem N, El-Zir E, Loiselet J, Petit C. A mutation in OTOF, encoding otoferlin, a FER-1-like protein, causes DFNB9, a nonsyndromic form of deafness. Nat Genet 1999; 21:363-9. [PMID: 10192385 DOI: 10.1038/7693] [Citation(s) in RCA: 365] [Impact Index Per Article: 14.6] [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: 11/09/2022]
Abstract
Using a candidate gene approach, we identified a novel human gene, OTOF, underlying an autosomal recessive, nonsyndromic prelingual deafness, DFNB9. The same nonsense mutation was detected in four unrelated affected families of Lebanese origin. OTOF is the second member of a mammalian gene family related to Caenorhabditis elegans fer-1. It encodes a predicted cytosolic protein (of 1,230 aa) with three C2 domains and a single carboxy-terminal transmembrane domain. The sequence homologies and predicted structure of otoferlin, the protein encoded by OTOF, suggest its involvement in vesicle membrane fusion. In the inner ear, the expression of the orthologous mouse gene, mainly in the sensory hair cells, indicates that such a role could apply to synaptic vesicles.
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Affiliation(s)
- S Yasunaga
- Unité de Génétique des Déficits Sensoriels, CNRS URA 1968, Institut Pasteur, Paris, France
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17
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Denoyelle F, Weil D, Maw MA, Wilcox SA, Lench NJ, Allen-Powell DR, Osborn AH, Dahl HH, Middleton A, Houseman MJ, Dodé C, Marlin S, Boulila-ElGaïed A, Grati M, Ayadi H, BenArab S, Bitoun P, Lina-Granade G, Godet J, Mustapha M, Loiselet J, El-Zir E, Aubois A, Joannard A, Levilliers J, Garabédian EN, Mueller RF, Gardner RJ, Petit C. Prelingual deafness: high prevalence of a 30delG mutation in the connexin 26 gene. Hum Mol Genet 1997; 6:2173-7. [PMID: 9336442 DOI: 10.1093/hmg/6.12.2173] [Citation(s) in RCA: 403] [Impact Index Per Article: 14.9] [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] [Indexed: 02/05/2023] Open
Abstract
Prelingual non-syndromic (isolated) deafness is the most frequent hereditary sensory defect. In >80% of the cases, the mode of transmission is autosomal recessive. To date, 14 loci have been identified for the recessive forms (DFNB loci). For two of them, DFNB1 and DFNB2, the genes responsible have been characterized; they encode connexin 26 and myosin VIIA, respectively. In order to evaluate the extent to which the connexin 26 gene (Cx26) contributes to prelingual deafness, we searched for mutations in this gene in 65 affected Caucasian families originating from various countries, mainly tunisia, France, New Zealand and the UK. Six of these families are consanguineous, and deafness was shown to be linked to the DFNB1 locus, 10 are small non consanguineous families in which the segregation of the trait has been found to be compatible with the involvement of DFNB1, and in the remaining 49 families no linkage analysis has been performed. A total of 62 mutant alleles in 39 families were identified. Therefore, mutations in Cx26 represent a major cause of recessively inherited prelingual deafness since according to the present results they would underlie approximately half of the cases. In addition, one specific mutation, 30delG, accounts for the majority (approximately 70%) of the Cx26 mutant alleles. It is therefore one of the most frequent disease mutations so far identified. Several lines of evidence indicate that the high prevalence of the 30delG mutation arises from a mutation hot spot rather than from a founder effect. Genetic counseling for prelingual deafness has been so far considerably impaired by the difficulty in distinguishing genetic and non genetic deafness in families presenting with a single deaf child. Based on the results presented here, the development of a simple molecular test could be designed which should be of considerable help.
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Affiliation(s)
- F Denoyelle
- Unité de Génétique de Déficits Sensoriels, CNRS URA 1968, Institut Pasteur, Paris, France
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