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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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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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3
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Oestreicher D, Picher MM, Rankovic V, Moser T, Pangrsic T. Cabp2-Gene Therapy Restores Inner Hair Cell Calcium Currents and Improves Hearing in a DFNB93 Mouse Model. Front Mol Neurosci 2021; 14:689415. [PMID: 34489639 PMCID: PMC8417311 DOI: 10.3389/fnmol.2021.689415] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 07/28/2021] [Indexed: 12/02/2022] Open
Abstract
Clinical management of auditory synaptopathies like other genetic hearing disorders is currently limited to the use of hearing aids or cochlear implants. However, future gene therapy promises restoration of hearing in selected forms of monogenic hearing impairment, in which cochlear morphology is preserved over a time window that enables intervention. This includes non-syndromic autosomal recessive hearing impairment DFNB93, caused by defects in the CABP2 gene. Calcium-binding protein 2 (CaBP2) is a potent modulator of inner hair cell (IHC) voltage-gated calcium channels CaV1.3. Based on disease modeling in Cabp2–/– mice, DFNB93 hearing impairment has been ascribed to enhanced steady-state inactivation of IHC CaV1.3 channels, effectively limiting their availability to trigger synaptic transmission. This, however, does not seem to interfere with cochlear development and does not cause early degeneration of hair cells or their synapses. Here, we studied the potential of a gene therapeutic approach for the treatment of DFNB93. We used AAV2/1 and AAV-PHP.eB viral vectors to deliver the Cabp2 coding sequence into IHCs of early postnatal Cabp2–/– mice and assessed the level of restoration of hair cell function and hearing. Combining in vitro and in vivo approaches, we observed high transduction efficiency, and restoration of IHC CaV1.3 function resulting in improved hearing of Cabp2–/– mice. These preclinical results prove the feasibility of DFNB93 gene therapy.
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Affiliation(s)
- David Oestreicher
- Experimental Otology Group, InnerEarLab, Department of Otolaryngology, University Medical Center Göttingen, Göttingen, Germany.,Auditory Neuroscience Group, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Maria Magdalena Picher
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany
| | - Vladan Rankovic
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany.,Restorative Cochlear Genomics Group, Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Göttingen, Germany
| | - Tobias Moser
- Auditory Neuroscience Group, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany.,Collaborative Research Center 889, University of Göttingen, Göttingen, Germany.,Multiscale Bioimaging Cluster of Excellence (MBExC), University of Göttingen, Göttingen, Germany
| | - Tina Pangrsic
- Experimental Otology Group, InnerEarLab, Department of Otolaryngology, University Medical Center Göttingen, Göttingen, Germany.,Auditory Neuroscience Group, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Collaborative Research Center 889, University of Göttingen, Göttingen, Germany.,Multiscale Bioimaging Cluster of Excellence (MBExC), University of Göttingen, Göttingen, Germany
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4
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Clinical features of hearing loss caused by STRC gene deletions/mutations in Russian population. Int J Pediatr Otorhinolaryngol 2020; 138:110247. [PMID: 32705992 DOI: 10.1016/j.ijporl.2020.110247] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/02/2020] [Accepted: 07/02/2020] [Indexed: 12/29/2022]
Abstract
UNLABELLED Congenital sensorineural hearing loss is related to mutations in numerous genes encoding the structures of the inner ear in majority of the cases. Mutations in GJB2 gene are the most frequently identified causes of congenital nonsyndromal hearing loss. GJB2 gene testing became a routine clinical tool. For GJB2-negative patients new genetic approaches including methods based on new generation sequencing give a chance to identify mutations in other genes. The frequent reason of mild-to-moderate hearing loss such as the deletions/mutations of the gene STRC encoding stereocilin protein were recognized (OMIM: 606440). OBJECTIVES To evaluate the audiological features in hearing impaired patients with deletions and point mutations in the STRC gene. PATIENTS AND METHODS The group of 28 patients from 21 unrelated families with pathological mutations in the STRC gene underwent audiological examination. The description and analysis of the results of full audiological examination was provided. RESULTS All patients initially had bilateral nonsyndromal sensorineural hearing loss. Among 11 homozygotes of large deletion harboring STRC to CATSPER2 genes were 7 male individuals indicating the presence of male infertility syndrome. In general, 7 children failed audiological screening and 4 children underwent audiological assessment in the age of 3 and 6 months. The most frequently hearing thresholds were registered between 35 and 55 dB that corresponds to mild-to-moderate hearing impairment. The average age of diagnostics was 7.9 years (ranged from 3 months to 45 years). In the majority of patients the audiological profiles were flat or descending with elevation of thresholds at middle and high frequencies and relatively preserved thresholds at low frequencies. Hearing thresholds are symmetric and stable with age. CONCLUSION STRC-linked hearing loss is congenital, of mild and moderate severity. Special clinical and genetic approach for children who failed newborn hearing screening with mild-to-moderate hearing loss is necessary.
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5
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Safka Brozkova D, Poisson Marková S, Mészárosová AU, Jenčík J, Čejnová V, Čada Z, Laštůvková J, Rašková D, Seeman P. Spectrum and frequencies of non GJB2 gene mutations in Czech patients with early non-syndromic hearing loss detected by gene panel NGS and whole-exome sequencing. Clin Genet 2020; 98:548-554. [PMID: 32860223 DOI: 10.1111/cge.13839] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/24/2020] [Accepted: 08/24/2020] [Indexed: 01/17/2023]
Abstract
Non-syndromic autosomal recessive hearing loss is an extremely heterogeneous disease caused by mutations in more than 80 genes. We examined Czech patients with early/prelingual non-syndromic, presumably genetic hearing loss (NSHL) without known cause after GJB2 gene testing. Four hundred and twenty-one unrelated patients were examined for STRC gene deletions with quantitative comparative fluorescent PCR (QCF PCR), 197 unrelated patients with next-generation sequencing by custom-designed NSHL gene panels and 19 patients with whole-exome sequencing (WES). Combining all methods, we discovered the cause of the disease in 54 patients. The most frequent type of NSHL was DFNB16 (STRC), which was detected in 22 patients, almost half of the clarified patients. Other biallelic pathogenic mutations were detected in the genes: MYO15A, LOXHD1, TMPRSS3 (each gene was responsible for five clarified patients, CDH23 (four clarified patients), OTOG and OTOF (each gene was responsible for two clarified patients). Other genes (AIFM1, CABP2, DIAPH1, PTPRQ, RDX, SLC26A4, TBC1D24, TECTA, TMC1) that explained the cause of hearing impairment were further detected in only one patient for each gene. STRC gene mutations, mainly deletions remain the most frequent NSHL cause after mutations in the GJB2.
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Affiliation(s)
- Dana Safka Brozkova
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Simona Poisson Marková
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Anna Uhrová Mészárosová
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Ján Jenčík
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Vlasta Čejnová
- Department of Medical Genetics, Masaryk Hospital in Usti nad Labem, Regional Health Corporation, Usti nad Labem, Czech Republic
| | - Zdeněk Čada
- Department of Otorhinolaryngology and Head and Neck Surgery, First Faculty of Medicine, Charles University, Motol University Hospital, Prague, Czech Republic
| | - Jana Laštůvková
- Department of Medical Genetics, Masaryk Hospital in Usti nad Labem, Regional Health Corporation, Usti nad Labem, Czech Republic
| | - Dagmar Rašková
- Centre for Medical Genetics and Reproductive Medicine Gennet, Prague 7, Czech Republic
| | - Pavel Seeman
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
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Sarmadi A, Nasrniya S, Soleimani Farsani M, Narrei S, Nouri Z, Sepehrnejad M, Nilforoush MH, Abtahi H, Tabatabaiefar MA. A novel pathogenic variant in the LRTOMT gene causes autosomal recessive non-syndromic hearing loss in an Iranian family. BMC MEDICAL GENETICS 2020; 21:127. [PMID: 32517708 PMCID: PMC7285524 DOI: 10.1186/s12881-020-01061-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 06/02/2020] [Indexed: 02/07/2023]
Abstract
Background Hearing loss (HL) is the most common sensorineural disorder with high phenotypic and genotypic heterogeneity, which negatively affects life quality. Autosomal recessive non-syndromic hearing loss (ARNSHL) constitutes a major share of HL cases. In the present study, Whole exome sequencing (WES) was applied to investigate the underlying etiology of HL in an Iranian patient with ARNSHL. Methods A proband from an Iranian consanguineous family was examined via WES, following GJB2 sequencing. WES was utilized to find possible genetic etiology of the disease. Various Bioinformatics tools were used to assess the pathogenicity of the variants. Co-segregation analysis of the candidate variant was carried out. Interpretation of variants was performed according to the American College of Medical Genetics and Genomics (ACMG) guidelines. Results WES results showed a novel frameshift (16 bp deletion) variant (p.Ala170Alafs*20) in the LRTOMT gene. This variant, which resides in exon 6, was found to be co-segregating in the family. It fulfils the criteria set by the ACMG guidelines of being pathogenic. Conclusion Here, we report successful application of WES to identify the molecular pathogenesis of ARNSHL, which is a genetically heterogeneous disorder, in a patient with ARNSHL.
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Affiliation(s)
- Akram Sarmadi
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.,Genetics Department, Erythron Pathobiology and Genetics lab, Isfahan, Iran
| | - Samane Nasrniya
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Maryam Soleimani Farsani
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran
| | - Sina Narrei
- Genetics Department, Erythron Pathobiology and Genetics lab, Isfahan, Iran
| | - Zahra Nouri
- Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahsa Sepehrnejad
- Department of Otolaryngology, Al-Zahra Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Hamidreza Abtahi
- Department of Otolaryngology, Al-Zahra Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Amin Tabatabaiefar
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. .,Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Noncommunicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran. .,GenTArget Corp (GTAC), Deputy of Research and Technology, Isfahan University of Medical Sciences, Isfahan, Iran.
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7
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Burgoyne RD, Helassa N, McCue HV, Haynes LP. Calcium Sensors in Neuronal Function and Dysfunction. Cold Spring Harb Perspect Biol 2019; 11:cshperspect.a035154. [PMID: 30833454 DOI: 10.1101/cshperspect.a035154] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Calcium signaling in neurons as in other cell types can lead to varied changes in cellular function. Neuronal Ca2+ signaling processes have also become adapted to modulate the function of specific pathways over a wide variety of time domains and these can have effects on, for example, axon outgrowth, neuronal survival, and changes in synaptic strength. Ca2+ also plays a key role in synapses as the trigger for fast neurotransmitter release. Given its physiological importance, abnormalities in neuronal Ca2+ signaling potentially underlie many different neurological and neurodegenerative diseases. The mechanisms by which changes in intracellular Ca2+ concentration in neurons can bring about diverse responses is underpinned by the roles of ubiquitous or specialized neuronal Ca2+ sensors. It has been established that synaptotagmins have key functions in neurotransmitter release, and, in addition to calmodulin, other families of EF-hand-containing neuronal Ca2+ sensors, including the neuronal calcium sensor (NCS) and the calcium-binding protein (CaBP) families, play important physiological roles in neuronal Ca2+ signaling. It has become increasingly apparent that these various Ca2+ sensors may also be crucial for aspects of neuronal dysfunction and disease either indirectly or directly as a direct consequence of genetic variation or mutations. An understanding of the molecular basis for the regulation of the targets of the Ca2+ sensors and the physiological roles of each protein in identified neurons may contribute to future approaches to the development of treatments for a variety of human neuronal disorders.
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Affiliation(s)
- Robert D Burgoyne
- Department of Cellular and Molecular Physiology, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
| | - Nordine Helassa
- Department of Cellular and Molecular Physiology, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
| | - Hannah V McCue
- Centre for Genomic Research, University of Liverpool, Liverpool, United Kingdom
| | - Lee P Haynes
- Department of Cellular and Molecular Physiology, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
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8
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An J, Yang J, Wang Y, Wang Y, Xu B, Xie G, Chai S, Liu X, Xu S, Wen X, He Q, Liu H, Li C, Dey SK, Ni Y, Banerjee S. Targeted Next Generation Sequencing Revealed a Novel Homozygous Loss-of-Function Mutation in ILDR1 Gene Causes Autosomal Recessive Nonsyndromic Sensorineural Hearing Loss in a Chinese Family. Front Genet 2019; 10:1. [PMID: 30804975 PMCID: PMC6370629 DOI: 10.3389/fgene.2019.00001] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 01/03/2019] [Indexed: 01/13/2023] Open
Abstract
Hereditary hearing impairment is one of the major and common birth defects in Chinese population. Non-syndromic sensorineural hearing loss (NSHL) is the most common types of hereditary hearing impairment. Genotypically and phenotypically NSHL is extremely heterogenous and follow either autosomal dominant or autosomal recessive or X-linked mode of inheritance. Presently, 127 genes have been identified to be associated with both syndromic and (NSHL). Here, we studied a Chinese family with moderate and profound hearing impairment. The proband is a 30-year old Chinese man. The proband was born with normal hearing and at the age of 5-years, the proband was first noticed with hearing impairment. Gradually and progressively the proband was presented with loss of hearing in his both right and left ears at the age of 30 years. The clinical symptoms, age of onset or progression to loss of hearing was similar in both the proband and his younger brother. The proband’s parents are phenotypically normal and non-consanguineous. Clinical diagnosis of the proband and his younger brother has been done by classical pure tone audiogram (PTA). Computed Tomography (CT) found no abnormality in bilateral external ear, middle ear and inner ear. Targeted next generation sequencing was performed with a panel of 127 genes reported to be associated with hereditary hearing impairment. A novel homozygous single nucleotide deletion (c.427delT) in exon 4 of ILDR1 gene has been identified in proband and in his younger brother. Sanger sequencing confirmed that proband’s father and mother are carrying this mutation in a heterozygous manner. This mutation has not been identified in 100 normal healthy control individuals. This mutation (c.427delT) causes frameshift (p.Tyr143Ilefs∗19) which leads to the formation of a truncated ILDR1 protein of 162 amino acids instead of the wild type ILDR1 protein of 546 amino acids. ILDR1 associated hereditary hearing impairment is very rare and this is the first report of identifying a loss-of-function mutation in ILDR1 gene associated with hereditary hearing impairment in Chinese population. Our present study also emphasized the significance of rapid, accurate and cost-effective screening for the patient with hereditary hearing impairment by targeted next generation sequencing.
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Affiliation(s)
- Jinxia An
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Jie Yang
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Yan Wang
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Yanxia Wang
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Baicheng Xu
- Lanzhou University Second Hospital, Lanzhou, China
| | - Guangmei Xie
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Sanming Chai
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Xiaoling Liu
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Sijuan Xu
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Xiaoxiao Wen
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Qing He
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Huijun Liu
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Chen Li
- Department of Cell Biology and Medical Genetics, School of Medicine, Zhejiang University, Hangzhou, China
| | - Subrata Kumar Dey
- Department of Biotechnology, Centre for Genetic Studies, School of Biotechnology and Biological Sciences, Maulana Abul Kalam Azad University of Technology (Formerly West Bengal University of Technology), Kolkata, India
| | - Yali Ni
- Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
| | - Santasree Banerjee
- Department of Cell Biology and Medical Genetics, School of Medicine, Zhejiang University, Hangzhou, China
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9
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Al-Amri AH, Al Saegh A, Al-Mamari W, El-Asrag ME, Al-Kindi MN, Al Khabouri M, Al Wardy N, Al Lamki K, Gabr A, Idris A, Inglehearn CF, Clapcote SJ, Ali M. LHFPL5 mutation: A rare cause of non-syndromic autosomal recessive hearing loss. Eur J Med Genet 2018; 62:103592. [PMID: 30476627 DOI: 10.1016/j.ejmg.2018.11.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 07/30/2018] [Accepted: 11/22/2018] [Indexed: 11/18/2022]
Abstract
Hearing loss is a debilitating disorder that impairs language acquisition, resulting in disability in children and potential isolation in adulthood. Its onset can have a genetic basis, though environmental factors, which are often preventable, can also cause the condition. The genetic forms are highly heterogeneous, and early detection is necessary to arrange appropriate patient support. Here we report the molecular basis of hereditary hearing loss in a consanguineous family with multiple affected members from Oman. Combining homozygosity mapping with whole exome sequencing identified a novel homozygous nucleotide substitution c.575T > C in the lipoma HMGIC fusion partner-like 5 gene (LHFPL5), that converted the 192nd amino acid residue in the protein from a leucine to a proline, p.(Leu192Pro). Sanger sequencing confirmed segregation with the disease phenotype as expected for a recessive condition and the variant was absent in 123,490 subjects from various disease-specific and population genetic studies as well as 150 unrelated individuals and 35 deaf patients of Omani ethnicity. This study, which describes a novel LHFPL5 mutation in a family of Omani origin with hereditary hearing loss, supports previous clinical descriptions of the condition and contributes to the genetic spectrum of mutations in this form of deafness.
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Affiliation(s)
- Ahmed H Al-Amri
- Section of Ophthalmology & Neuroscience, Leeds Institute of Medical Research at St. James's, University of Leeds, United Kingdom; School of Biomedical Sciences, University of Leeds, United Kingdom; National Genetic Centre, Directorate General of Royal Hospital, Ministry of Health, Muscat, Oman
| | - Abeer Al Saegh
- Genetic & Developmental Medicine Clinic, Genetics Department, Sultan Qaboos University Hospital, Muscat, Oman
| | - Watfa Al-Mamari
- Developmental Pediatric Unit, Child Health Department, Sultan Qaboos University Hospital, Muscat, Oman
| | - Mohammed E El-Asrag
- Section of Ophthalmology & Neuroscience, Leeds Institute of Medical Research at St. James's, University of Leeds, United Kingdom; Department of Zoology, Faculty of Science, Benha University, Benha, Egypt
| | | | - Mazin Al Khabouri
- Department of Ear, Nose & Throat, Al Nahdha Hospital, Ministry of Health, Muscat, Oman
| | - Nadia Al Wardy
- Biochemistry Department, Sultan Qaboos University Hospital, Muscat, Oman
| | - Khalsa Al Lamki
- Biochemistry Department, Sultan Qaboos University Hospital, Muscat, Oman
| | - Ahlam Gabr
- Developmental Pediatric Unit, Child Health Department, Sultan Qaboos University Hospital, Muscat, Oman
| | - Ahmed Idris
- Developmental Pediatric Unit, Child Health Department, Sultan Qaboos University Hospital, Muscat, Oman
| | - Chris F Inglehearn
- Section of Ophthalmology & Neuroscience, Leeds Institute of Medical Research at St. James's, University of Leeds, United Kingdom
| | | | - Manir Ali
- Section of Ophthalmology & Neuroscience, Leeds Institute of Medical Research at St. James's, University of Leeds, United Kingdom.
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10
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Lerat J, Bonnet C, Cartault F, Loundon N, Jacquemont ML, Darcel F, Rouillon I, Mezouaghi K, Guichet A, Litzler J, Gesny R, Gherbi S, Aissa IB, Digeon FSJ, Garabedian EN, Bonnefont JP, Genin E, Denoyelle F, Jonard L, Marlin S. High prevalence of congenital deafness on Reunion Island is due to a founder variant of LHFPL5. Clin Genet 2018; 95:177-181. [PMID: 30298622 DOI: 10.1111/cge.13460] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 10/02/2018] [Accepted: 10/03/2018] [Indexed: 11/28/2022]
Abstract
Reunion Island is a French oversea department in the Indian Ocean with 1.6/1000, an estimated prevalence of deafness that is almost double as compared to the mainland France. Twelve children having isolated bilateral prelingual profound deafness along with motor delay attributed to vestibular areflexia were enrolled. Their mean walking age was 19 months. Electroretinography and temporal bone CT-scans were normal in all cases. A novel homozygous frameshift lipoma HMGIC fusion partner-like 5 (LHFPL5) variant c.185delT p.(Phe62Serfs*23) was identified using whole-exome sequencing. It was found in seven families. Four patients from two different families from both Reunion Island and mainland France, were compound heterozygous: c.185delT p.(Phe62Serfs*23) and c.472C > T p.(Arg158Trp). The phenotype observed in our patients completely mimics the hurry-scurry (hscy) murine Tmhs knock-out model. The recurrent occurrence of same LHFPL5 variant in Reunion Island is attributed to common ancestor couple born in 1693.
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Affiliation(s)
- Justine Lerat
- INSERM UMR_S1163 IHU Imagine - Institut des Maladies Génétiques - Université Paris Descartes, Paris, France.,Génétique Moléculaire, Necker, AP-HP, Paris, France.,Otorhinolaryngologie, CHU, Limoges, France
| | - Crystel Bonnet
- Institut de la Vision, UMRS 1120 INSERM/UPMC, Paris, France
| | - François Cartault
- Génétique Moléculaire, CHU La Réunion site Felix Guyon, Paris, France
| | - Natalie Loundon
- Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France.,Otorhinolaryngologie Pédiatrique, Necker, AP-HP, Paris, France
| | | | | | - Isabelle Rouillon
- Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France.,Otorhinolaryngologie Pédiatrique, Necker, AP-HP, Paris, France
| | - Kheira Mezouaghi
- Centre Régional de Compétences en Surdité Infantile, Sainte-Clothilde, France
| | | | | | | | - Souad Gherbi
- Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France
| | - Ines Ben Aissa
- Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France
| | | | - Eréa-Nöel Garabedian
- Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France.,Otorhinolaryngologie Pédiatrique, Necker, AP-HP, Paris, France
| | | | - Emmanuelle Genin
- UMR1078 Génétique, Génomique Fonctionnelle et Biotechnologies, Inserm, Université de Brest, CHU Brest, France
| | - Françoise Denoyelle
- Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France.,Otorhinolaryngologie Pédiatrique, Necker, AP-HP, Paris, France
| | - Laurence Jonard
- Génétique Moléculaire, Necker, AP-HP, Paris, France.,Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France
| | - Sandrine Marlin
- INSERM UMR_S1163 IHU Imagine - Institut des Maladies Génétiques - Université Paris Descartes, Paris, France.,Centre de Référence Maladies Rares, Surdités Génétiques, Necker, AP-HP, Paris, France
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STRC Deletion is a Frequent Cause of Slight to Moderate Congenital Hearing Impairment in the Czech Republic. Otol Neurotol 2018; 38:e393-e400. [PMID: 28984810 DOI: 10.1097/mao.0000000000001571] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE This study aimed to clarify the molecular epidemiology of hearing loss by identifying the responsible genes in patients without GJB2 mutations. STUDY DESIGN Prospective genetic study. SETTING Tertiary referral hospital. PATIENTS Fifty one patients with bilateral sensorineural hearing loss, 20 men, and 31 women, mean age 24.9 years, range 3 to 64 years, from 49 families. GJB2 and deltaGJB6-D13S1830 mutations were excluded previously. INTERVENTION Diagnostic. Sixty-nine genes reported to be causative of hearing loss were analyzed. Sequence capture technology, next-generation sequencing, and multiplex ligation-dependent probe amplification (MLPA) were used. Coverage of STRC was screened in Integrative Genomics Viewer software. MAIN OUTCOME MEASURE Identification of causal pathogenic mutations in genes related to deafness. RESULTS Five families (10%) had recessive STRC deletions or mutations. Five unrelated patients (10%) had recessive mutations in TMPRSS3, USH2A, PCDH15, LOXHD1, and MYO15A. Three families (6%) had autosomal dominant mutations in MYO6A, KCNQ4, and SIX1. One family (2%) had an X-linked POU3F4 mutation. Thus, we identified the cause of hearing loss in 28% of the families studied. CONCLUSIONS Following GJB2, STRC was the second most frequently mutated gene in patients from the Czech Republic with hearing loss. To decrease the cost of testing, we recommend STRC deletion screening with MLPA before next-generation sequencing. The existence of a pseudogene and polymorphic STRC regions can lead to false-positive or false-negative results when copy number variation analysis is based on next-generation sequencing data.
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Plevova P, Tvrda P, Paprskarova M, Turska P, Kantorova B, Mrazkova E, Zapletalova J. Genetic Aetiology of Nonsyndromic Hearing Loss in Moravia-Silesia. MEDICINA-LITHUANIA 2018; 54:medicina54020028. [PMID: 30344259 PMCID: PMC6037260 DOI: 10.3390/medicina54020028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/01/2018] [Accepted: 05/02/2018] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND OBJECTIVE Hearing loss is the most common sensory deficit in humans. The aim of this study was to clarify the genetic aetiology of nonsyndromic hearing loss in the Moravian-Silesian population of the Czech Republic. PATIENTS AND METHODS This study included 200 patients (93 males, 107 females, mean age 16.9 years, ranging from 4 months to 62 years) with nonsyndromic sensorineural hearing loss. We screened all patients for mutations in GJB2 and the large deletion del(GJB6-D13S1830). We performed further screening for additional genes (SERPINB6, TMIE, COCH, ESPN, ACTG1, KCNQ4, and GJB3) with Sanger sequencing on a subset of patients that were negative for GJB2 mutations. RESULTS We detected biallelic GJB2 mutations in 44 patients (22%). Among these patients, 63.6%, 9.1% and 2.3% exhibited homozygous c.35delG, p.Trp24*, and p.Met34Thr mutations, respectively. The remaining 25% of these patients exhibited compound heterozygous c.35delG, c.-23+1G>A, p.Trp24*, p.Val37Ile, p.Met34Thr, p.Leu90Pro, c.235delC, c.313_326del14, p.Ser139Asn, and p.Gly147Leu mutations. We found a monoallelic GJB2 mutation in 12 patients (6.6%). We found no pathogenic mutations in the other tested genes. Conclusions: One fifth of our cohort had deafness related to GJB2 mutations. The del(GJB6-D13S1830), SERPINB6, TMIE, COCH, ESPN, ACTG1, GJB3, and KCNQ4 mutations were infrequently associated with deafness in the Moravian-Silesian population. Therefore, we suggest that del(GJB6-D13S1830) testing should be performed only when patients with deafness carry the monoallelic GJB2 mutation.
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Affiliation(s)
- Pavlina Plevova
- Department of Medical Genetics, University Hospital Ostrava, 17. listopadu 1790, 708 52 Ostrava, Czech Republic.
| | - Petra Tvrda
- Department of Medical Genetics, University Hospital Ostrava, 17. listopadu 1790, 708 52 Ostrava, Czech Republic.
| | - Martina Paprskarova
- Department of Medical Genetics, University Hospital Ostrava, 17. listopadu 1790, 708 52 Ostrava, Czech Republic.
| | - Petra Turska
- Department of Medical Genetics, University Hospital Ostrava, 17. listopadu 1790, 708 52 Ostrava, Czech Republic.
| | - Barbara Kantorova
- Department of Medical Genetics, University Hospital Ostrava, 17. listopadu 1790, 708 52 Ostrava, Czech Republic.
| | - Eva Mrazkova
- Department of Epidemiology and Public Health, Faculty of Medicine, University of Ostrava, Syllabova 19, 703 00 Ostrava, Zábřeh, Czech Republic.
- Department of Otorhinolaryngology, Hospital of Havířov, Dělnická 1132/24, 736 01 Havířov, Czech Republic.
| | - Jana Zapletalova
- Department of Medical Biophysics, Faculty of Medicine and Dentistry, Palacky University Olomouc, Hnevotinska 3, 775 15 Olomouc, Czech Republic.
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Tlili A, Fahd Al Mutery A, Mahfood M, Kamal Eddine Ahmad Mohamed W, Bajou K. Identification of a novel frameshift mutation in the ILDR1 gene in a UAE family, mutations review and phenotype genotype correlation. PLoS One 2017; 12:e0185281. [PMID: 28945813 PMCID: PMC5612695 DOI: 10.1371/journal.pone.0185281] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 09/08/2017] [Indexed: 12/17/2022] Open
Abstract
Autosomal recessive non-syndromic hearing loss is one of the most common monogenic diseases. It is characterized by high allelic and locus heterogeneities that make a precise diagnosis difficult. In this study, whole-exome sequencing was performed for an affected patient allowing us to identify a new frameshift mutation (c.804delG) in the Immunoglobulin-Like Domain containing Receptor-1 (ILDR1) gene. Direct Sanger sequencing and segregation analysis were performed for the family pedigree. The mutation was homozygous in all affected siblings but heterozygous in the normal consanguineous parents. The present study reports a first ILDR1 gene mutation in the UAE population and confirms that the whole-exome sequencing approach is a robust tool for the diagnosis of monogenic diseases with high levels of allelic and locus heterogeneity. In addition, by reviewing all reported ILDR1 mutations, we attempt to establish a genotype phenotype correlation to explain the phenotypic variability observed at low frequencies.
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Affiliation(s)
- Abdelaziz Tlili
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates
- Human Genetics and Stem cell laboratory, Research Institute of Sciences and Engineering, University of Sharjah, Sharjah, United Arab Emirates
- * E-mail:
| | - Abdullah Fahd Al Mutery
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Mona Mahfood
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | | | - Khalid Bajou
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates
- Human Genetics and Stem cell laboratory, Research Institute of Sciences and Engineering, University of Sharjah, Sharjah, United Arab Emirates
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Laleh MA, Naseri M, Zonouzi AAP, Zonouzi AP, Masoudi M, Ahangari N, Shams L, Nejatizadeh A. Diverse pattern of gap junction beta-2 and gap junction beta-4 genes mutations and lack of contribution of DFNB21, DFNB24, DFNB29, and DFNB42 loci in autosomal recessive nonsyndromic hearing loss patients in Hormozgan, Iran. JOURNAL OF RESEARCH IN MEDICAL SCIENCES 2017; 22:99. [PMID: 28900455 PMCID: PMC5583625 DOI: 10.4103/jrms.jrms_976_16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 04/26/2017] [Accepted: 05/12/2017] [Indexed: 11/04/2022]
Abstract
BACKGROUND We aimed to determine the contribution of four DFNB loci and mutation analysis of gap junction beta-2 (GJB2) and GJB4 genes in autosomal recessive nonsyndromic hearing loss (ARNSHL) in South of Iran. MATERIALS AND METHODS A total of 36 large ARNSHL pedigrees with at least two affected subjects were enrolled in the current study. The GJB2 and GJB4 genes mutations were screened using direct sequencing method. The GJB2 and GJB4 negative families were analyzed for the linkage to DFNB21, DFNB24, DFNB29, and DFNB42 loci by genotyping the corresponding STR markers using polymerase chain reaction-PAGE method. RESULTS We found a homozygous nonsense mutation W77X and a homozygous missense mutation C169W in 5.55% of studied families in GJB2 and GJB4 genes, respectively. Five heterozygous mutations including V63G, A78T, and R127H in GJB2 gene, and R103C and R227W in GJB4 gene were detected. We identified two novel variations V63G in GJB2 and R227W in GJB4. In silico analysis predicted that both novel variations are deleterious mutations. We did not unveil any linkage between DFNB21, DFNB24, DFNB29, and DFNB42 loci and ARNSHL among studied families. CONCLUSION This is the first report of GJB2 and GJB4 mutations from Hormozgan population. According to the previous publications regarding GJB2 and GJB4 mutations, the distribution of the mutations is different from other parts of Iran that should be considered in primary health-care programs. Further investigations are needed to evaluate the contribution of other loci in ARNSHL subjects in South of Iran.
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Affiliation(s)
- Masoud Akbarzadeh Laleh
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Marzieh Naseri
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | | | | | - Marjan Masoudi
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Najmeh Ahangari
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Leila Shams
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Azim Nejatizadeh
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
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Abstract
PURPOSE OF REVIEW In the age of targeted genomic enrichment and massively parallel sequencing, there is no more efficient genetic testing method for the diagnosis of hereditary hearing loss. More clinical tests are on the market, which can make choosing good tests difficult. RECENT FINDINGS More and larger comprehensive genetic studies in patients with hearing loss have been published recently. They remind us of the importance of looking for both single nucleotide variation and copy number variation in all genes implicated in nonsyndromic hearing loss. They also inform us of how a patient's history and phenotype provide essential information in the interpretation of genetic data. SUMMARY Choosing the most comprehensive genetic test improves the chances of a genetic diagnosis and thereby impacts clinical care.
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