1
|
Sakuma N, Nishio SY, Goto SI, Honkura Y, Oda K, Takeda H, Kobayashi M, Kumakawa K, Iwasaki S, Takahashi M, Ito T, Arai Y, Isono Y, Obara N, Matsunobu T, Okubo K, Usami SI. Detailed Clinical Features of PTPRQ-Associated Hearing Loss Identified in a Large Japanese Hearing Loss Cohort. Genes (Basel) 2024; 15:489. [PMID: 38674423 PMCID: PMC11050587 DOI: 10.3390/genes15040489] [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: 03/20/2024] [Revised: 04/10/2024] [Accepted: 04/10/2024] [Indexed: 04/28/2024] Open
Abstract
The PTPRQ gene has been identified as one of the genes responsible for non-syndromic sensorineural hearing loss (SNHL), and assigned as DFNA73 and DFNB84. To date, about 30 causative PTPRQ variants have been reported to cause SNHL. However, the detailed clinical features of PTPRQ-associated hearing loss (HL) remain unclear. In this study, 15,684 patients with SNHL were enrolled and genetic analysis was performed using massively parallel DNA sequencing (MPS) for 63 target deafness genes. We identified 17 possibly disease-causing PTPRQ variants in 13 Japanese patients, with 15 of the 17 variants regarded as novel. The majority of variants identified in this study were loss of function. Patients with PTPRQ-associated HL mostly showed congenital or childhood onset. Their hearing levels at high frequency deteriorated earlier than that at low frequency. The severity of HL progressed from moderate to severe or profound HL. Five patients with profound or severe HL received cochlear implantation, and the postoperative sound field threshold levels and discrimination scores were favorable. These findings will contribute to a greater understanding of the clinical features of PTPRQ-associated HL and may be relevant in clinical practice.
Collapse
Affiliation(s)
- Naoko Sakuma
- Department of Otorhinolaryngology, Head and Neck Surgery, Nippon Medical School, Tokyo 113-8603, Japan; (N.S.); (T.M.); (K.O.)
| | - Shin-ya Nishio
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1, Asahi, Matsumoto City 390-8621, Japan;
| | - Shin-ichi Goto
- Department of Otorhinolaryngology, Hirosaki University Graduate School of Medicine, Hirosaki 036-8560, Japan;
| | - Yohei Honkura
- Department of Otolaryngology-Head and Neck Surgery, Tohoku University School of Medicine, Sendai 980-8575, Japan;
| | - Kiyoshi Oda
- Department of Otolaryngology, Tohoku Rosai Hospital, Sendai 981-8563, Japan;
| | - Hidehiko Takeda
- Department of Otorhinolaryngology, Toranomon Hospital, Tokyo 105-8470, Japan; (H.T.); (M.K.)
| | - Marina Kobayashi
- Department of Otorhinolaryngology, Toranomon Hospital, Tokyo 105-8470, Japan; (H.T.); (M.K.)
| | - Kozo Kumakawa
- Department of Otolaryngology, Kamio Memorial Hospital, Tokyo 101-0063, Japan;
- Akasaka Toranomon Clinic, Tokyo 107-0052, Japan
| | - Satoshi Iwasaki
- Department of Otorhinolaryngology, International University of Health and Welfare, Mita Hospital, Tokyo 108-8329, Japan; (S.I.); (M.T.)
| | - Masahiro Takahashi
- Department of Otorhinolaryngology, International University of Health and Welfare, Mita Hospital, Tokyo 108-8329, Japan; (S.I.); (M.T.)
| | - Taku Ito
- Department of Otorhinolaryngology, Tokyo Medical and Dental University, Tokyo 113-8510, Japan;
| | - Yasuhiro Arai
- Department of Otorhinolaryngology-Head and Neck Surgery, Yokohama City University School of Medicine, Yokohama 236-0004, Japan;
| | - Yasuhiro Isono
- Department of Otolaryngology, Yokohama City University Medical Center, Yokohama 232-0024, Japan;
| | - Natsuko Obara
- Department of Otolaryngology, Gifu University Graduate School of Medicine, Gifu City 501-1194, Japan;
| | - Takeshi Matsunobu
- Department of Otorhinolaryngology, Head and Neck Surgery, Nippon Medical School, Tokyo 113-8603, Japan; (N.S.); (T.M.); (K.O.)
| | - Kimihiro Okubo
- Department of Otorhinolaryngology, Head and Neck Surgery, Nippon Medical School, Tokyo 113-8603, Japan; (N.S.); (T.M.); (K.O.)
| | - Shin-ichi Usami
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1, Asahi, Matsumoto City 390-8621, Japan;
| |
Collapse
|
2
|
Ji H, Zhang L, Hussain HMJ, Aftab A, Yu H, Xiao M. Novel cis compound heterozygous variants in MYO6 causes early onset of non-syndromic hearing loss in a Chinese family. Front Genet 2024; 14:1275633. [PMID: 38274113 PMCID: PMC10808792 DOI: 10.3389/fgene.2023.1275633] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 12/26/2023] [Indexed: 01/27/2024] Open
Abstract
Background: Mutations in the MYO6 gene have been associated with both autosomal dominant non-syndromic hearing loss (ADNSHL) and autosomal recessive non-syndromic hearing loss (ARNSHL), with a cumulative identification of 125 pathogenic variants. To investigate the underlying genetic factor within a Chinese family affected with heriditary hearing loss, prompted the utilization of high-throughput sequencing. Method: A detailed clinical investigation was performed. Genetic testing was performed by using target panel sequencing, and Sanger sequencing. Targeted sequencing identified the variants and Sanger sequencing was employed to validate segregation of the identified variants within family. Additionally, bioinformatics analysis was performed to strengthen our findings. Results: Clinical investigation revealed the family members were affected by progressive and sensorineural hearing loss with an onset around 8-10 years old. Furthermore, genetic testing identified novel MYO6 variants, c.[2377T>G; 2382G>T] p.[Trp793Gly; Lys794Asn], positioned in a cis pattern, as plausible pathogenic contributors to early-onset hearing loss characterized by a severe and progressive course. Moreover, bioinformatics analysis showd disruptin in hydrogen bonding of mutant amino acids with interactive amino acids. Conclusion: Our research uncovered a relationship between mutations in the MYO6 gene and non-syndromic hearing loss. We identified two variants, c.[2377T>G; 2382G>T] p.[Trp793Gly; Lys794Asn] in MYO6 as strong candidates responsible for the observed progressive hereditary hearing loss. This study not only adds to our knowledge about hearing problems related to MYO6 but also reveals the presence of monogenic compound heterozygosity. Our study will provide a new sight for genetic diagnosis in such patients and their management for future use.
Collapse
Affiliation(s)
- Haiting Ji
- Department of Otorhinolaryngology, Affiliated Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute and Otorhinolaryngology, Department of Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai, China
| | - Lichun Zhang
- Department of Otorhinolaryngology, Head and Neck Surgery, Otto Körner, Rostock University Medical Center, Rostock, Germany
| | | | - Ayesha Aftab
- Department of Biological Sciences, International Islamic University, Islamabad, Pakistan
| | - Huiqian Yu
- Department of Otorhinolaryngology, Affiliated Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute and Otorhinolaryngology, Department of Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai, China
| | - Min Xiao
- Shanghai Ji Ai Genetics and IVF Institute, The Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
| |
Collapse
|
3
|
Aldè M, Cantarella G, Zanetti D, Pignataro L, La Mantia I, Maiolino L, Ferlito S, Di Mauro P, Cocuzza S, Lechien JR, Iannella G, Simon F, Maniaci A. Autosomal Dominant Non-Syndromic Hearing Loss (DFNA): A Comprehensive Narrative Review. Biomedicines 2023; 11:1616. [PMID: 37371710 DOI: 10.3390/biomedicines11061616] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [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: 05/07/2023] [Revised: 05/26/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023] Open
Abstract
Autosomal dominant non-syndromic hearing loss (HL) typically occurs when only one dominant allele within the disease gene is sufficient to express the phenotype. Therefore, most patients diagnosed with autosomal dominant non-syndromic HL have a hearing-impaired parent, although de novo mutations should be considered in all cases of negative family history. To date, more than 50 genes and 80 loci have been identified for autosomal dominant non-syndromic HL. DFNA22 (MYO6 gene), DFNA8/12 (TECTA gene), DFNA20/26 (ACTG1 gene), DFNA6/14/38 (WFS1 gene), DFNA15 (POU4F3 gene), DFNA2A (KCNQ4 gene), and DFNA10 (EYA4 gene) are some of the most common forms of autosomal dominant non-syndromic HL. The characteristics of autosomal dominant non-syndromic HL are heterogenous. However, in most cases, HL tends to be bilateral, post-lingual in onset (childhood to early adulthood), high-frequency (sloping audiometric configuration), progressive, and variable in severity (mild to profound degree). DFNA1 (DIAPH1 gene) and DFNA6/14/38 (WFS1 gene) are the most common forms of autosomal dominant non-syndromic HL affecting low frequencies, while DFNA16 (unknown gene) is characterized by fluctuating HL. A long audiological follow-up is of paramount importance to identify hearing threshold deteriorations early and ensure prompt treatment with hearing aids or cochlear implants.
Collapse
Affiliation(s)
- Mirko Aldè
- Department of Clinical Sciences and Community Health, University of Milan, 20090 Milan, Italy
- Department of Specialist Surgical Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20090 Milan, Italy
- Otology Study Group of the Young-Otolaryngologists of the International Federations of Oto-Rhino-Laryngological Societies (YO-IFOS), 75000 Paris, France
| | - Giovanna Cantarella
- Department of Clinical Sciences and Community Health, University of Milan, 20090 Milan, Italy
- Department of Specialist Surgical Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20090 Milan, Italy
| | - Diego Zanetti
- Department of Clinical Sciences and Community Health, University of Milan, 20090 Milan, Italy
- Department of Specialist Surgical Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20090 Milan, Italy
| | - Lorenzo Pignataro
- Department of Clinical Sciences and Community Health, University of Milan, 20090 Milan, Italy
- Department of Specialist Surgical Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20090 Milan, Italy
| | - Ignazio La Mantia
- Department of Medical, Surgical Sciences and Advanced Technologies G.F. Ingrassia, University of Catania, 95123 Catania, Italy
| | - Luigi Maiolino
- Department of Medical, Surgical Sciences and Advanced Technologies G.F. Ingrassia, University of Catania, 95123 Catania, Italy
| | - Salvatore Ferlito
- Department of Medical, Surgical Sciences and Advanced Technologies G.F. Ingrassia, University of Catania, 95123 Catania, Italy
| | - Paola Di Mauro
- Department of Medical, Surgical Sciences and Advanced Technologies G.F. Ingrassia, University of Catania, 95123 Catania, Italy
| | - Salvatore Cocuzza
- Department of Medical, Surgical Sciences and Advanced Technologies G.F. Ingrassia, University of Catania, 95123 Catania, Italy
| | - Jérôme René Lechien
- Otology Study Group of the Young-Otolaryngologists of the International Federations of Oto-Rhino-Laryngological Societies (YO-IFOS), 75000 Paris, France
| | - Giannicola Iannella
- Otology Study Group of the Young-Otolaryngologists of the International Federations of Oto-Rhino-Laryngological Societies (YO-IFOS), 75000 Paris, France
| | - Francois Simon
- Otology Study Group of the Young-Otolaryngologists of the International Federations of Oto-Rhino-Laryngological Societies (YO-IFOS), 75000 Paris, France
| | - Antonino Maniaci
- Otology Study Group of the Young-Otolaryngologists of the International Federations of Oto-Rhino-Laryngological Societies (YO-IFOS), 75000 Paris, France
- Department of Medical, Surgical Sciences and Advanced Technologies G.F. Ingrassia, University of Catania, 95123 Catania, Italy
| |
Collapse
|
4
|
Sharma N, Kumari D, Panigrahi I, Khetarpal P. A systematic review of the monogenic causes of Non-Syndromic Hearing Loss (NSHL) and discussion of Current Diagnosis and Treatment options. Clin Genet 2023; 103:16-34. [PMID: 36089522 DOI: 10.1111/cge.14228] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 04/26/2022] [Revised: 09/02/2022] [Accepted: 09/06/2022] [Indexed: 12/13/2022]
Abstract
Hearing impairment is one of the most widespread inheritable sensory disorder affecting at least 1 in every 1000 born. About two-third of hereditary hearing loss (HHL) disorders are non-syndromic. To provide comprehensive update of monogenic causes of non-syndromic hearing loss (NSHL), literature search has been carried out with appropriate keywords in the following databases-PubMed, Google Scholar, Cochrane library, and Science Direct. Out of 2214 papers, 271 papers were shortlisted after applying inclusion and exclusion criterion. Data extracted from selected papers include information about gene name, identified pathogenic variants, ethnicity of the patient, age of onset, gender, title, authors' name, and year of publication. Overall, pathogenic variants in 98 different genes have been associated with NSHL. These genes have important role to play during early embryonic development in ear structure formation and hearing development. Here, we also review briefly the recent information about diagnosis and treatment approaches. Understanding pathogenic genetic variants are helpful in the management of affected and may offer targeted therapies in future.
Collapse
Affiliation(s)
- Nandita Sharma
- Department of Human Genetics and Molecular Medicine, School of Health Sciences, Central University of Punjab, Bathinda, India
| | - Divya Kumari
- Department of Pediatrics Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Inusha Panigrahi
- Department of Pediatrics Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Preeti Khetarpal
- Department of Human Genetics and Molecular Medicine, School of Health Sciences, Central University of Punjab, Bathinda, India
| |
Collapse
|
5
|
Elsayed O, Al‐Shamsi A. Mutation spectrum of non-syndromic hearing loss in the UAE, a retrospective cohort study and literature review. Mol Genet Genomic Med 2022; 10:e2052. [PMID: 36056583 PMCID: PMC9651598 DOI: 10.1002/mgg3.2052] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 05/05/2022] [Revised: 06/23/2022] [Accepted: 08/15/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Hearing loss (HL) is a heterogeneous condition that causes partial or complete hearing impairment. Hundreds of variants in >60 genes have been reported to be associated with Hereditary HL (HHL), variants of the GJB2 gene are the most common cause of congenital SNHL, with >100 variants reported. The HHL prevalence is thought to be high in the Arab population; however, the genetic epidemiology of HHL among Emirati populations is understudied. AIMS To shed light on the mutational spectrum of NSHL in Emirati patients seen in the genetic clinic over 10 years and to capture founder mutation(s) if any were identified. METHODS Retrospective chart review of all Emirati patients assessed by clinical geneticists due to NSHL during the period between January 2010 to December 2020. Genetic tests were done based on clinical phenotypes of the patient and family history including targeted mutation testing, next-generation sequencing, or whole-exome sequencing (solo or trio). The authors did literature reviews using PubMed for all previously reported articles related to NSHL genes from UAE. RESULTS A total of 162 patients with HL, were evaluated during the period between January 2010 to December 2020. There were 82 patients with NSHL, and only 72 patients who completed the genetic evaluations were included in this retrospective study. Among the studied group, 42 (51.2%) were males and 40 (48.78%) were females. The youngest patient was 2 years old and the oldest patient was 50 years old. Consanguinity was documented in 76 patients (92.68%). A total of 14 mutations reported here are novel (23/72 i.e., 31.9%). Twelve missense mutations, 6 nonsense mutations, 6 frameshift mutations, 2 in-frame deletion mutations, and 1 splice site mutation was found. Variants in the GJB2 gene are the most commonly identified cause of NSHL, with c.35delG being the most followed by c.506G > A. The second commonly found variant is c.934C > G (p.Arg312Gly) in the CDC14A gene, found in 9 patients. This was followed by variants in OTOF and SLC26A4 genes, found in 8 patients, respectively. Chromosomal microdeletions encompassing genes causing NSHL were found in 3 patients. No mitochondrial mutations were found in this study group. A total of 11 previous reports about Emirati patients with NSHL were reviewed, with a total of 35 patients. CONCLUSION Emirati patients with NSHL have several mutations, most notably missense mutations. Novel mutations are worth further testing and represent the area for future researches.
Collapse
Affiliation(s)
- Omnia Elsayed
- Pediatrics DepartmentTawam HospitalAl AinUnited Arab Emirates
| | - Aisha Al‐Shamsi
- Genetic Division, Pediatrics DepartmentTawam HospitalAl AinUnited Arab Emirates
| |
Collapse
|
6
|
Jiang Y, Huang S, Zhang Y, Fang N, Liu Q, Liu Y, Bai L, Han D, Dai P. Evolutionary origin of pathogenic GJB2 alleles in China. Clin Genet 2022; 102:305-313. [PMID: 35841299 DOI: 10.1111/cge.14191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 05/31/2022] [Revised: 07/12/2022] [Accepted: 07/13/2022] [Indexed: 11/28/2022]
Abstract
The frequency of the pathogenic allele of the autosomal recessive deafness gene GJB2 varies among different populations in the world, and accumulates to a sufficiently high frequency in certain population. The purpose of this study is to investigate the origin and evolution of GJB2 pathogenic alleles in Chinese deaf patients. Children with non-syndromic hearing loss, and their parents, from 295 families were recruited. Customized capture probes targeted at 943 SNPs related to GJB2 gene were designed for sequencing of genomic DNA in blood samples. Haplotypes carrying pathogenic allele were analyzed through linkage disequilibrium block building, ancestry tracing, and extended haplotype heterozygosity calculation. Two pathogenic GJB2 alleles, c.235delC (18.41%) and c.109G>A (15.57%), were observed in 867 donors. For c.235delC allele, 3 different core haplotypes with one major haplotype (97.32%) were found, and their core SNPs were 100% conserved. For c.109G>A allele, 6 different haplotypes with one major haplotype (93.28%) were found and the major c.109G>A allele evolved from a specific ancestral haplotype. Geographical origins of donors carrying GJB2 c.109G>A and c.235delC core haplotypes centered between Qinghai and Neimenggu. GJB2 c.235delC has long-range linkage disequilibrium. No positive selection signature was found for GJB2 c.235delC or c.109G>A in the studied population. In conclusion, we discovered a single origin of GJB2 c.235delC allele and multiple independent origins of GJB2 c.109G>A allele. Alternative to positive selection or multiple independent recurrent mutation event, population bottleneck effect might account for the observed high population frequency of these pathogenic alleles.
Collapse
Affiliation(s)
- Yi Jiang
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Shasha Huang
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China.,Key Lab of Hearing Impairment Science of Ministry of Education, Beijing, China.,Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Yi Zhang
- Euler Technology, Beijing, China
| | - Nan Fang
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Qian Liu
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Yunchao Liu
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Ling Bai
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Dongyi Han
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China.,Key Lab of Hearing Impairment Science of Ministry of Education, Beijing, China.,Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Pu Dai
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China.,Key Lab of Hearing Impairment Science of Ministry of Education, Beijing, China.,Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| |
Collapse
|
7
|
Wang WQ, Gao X, Huang SS, Kang DY, Xu JC, Yang K, Han MY, Zhang X, Yang SY, Yuan YY, Dai P. Genetic Analysis of the LOXHD1 Gene in Chinese Patients With Non-Syndromic Hearing Loss. Front Genet 2022; 13:825082. [PMID: 35711932 PMCID: PMC9196635 DOI: 10.3389/fgene.2022.825082] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 02/22/2022] [Indexed: 11/13/2022] Open
Abstract
Non-syndromic hearing loss (NSHL) is a common neurosensory disease with an extreme genetic heterogeneity which has been linked to variants in over 120 genes. The LOXHD1 gene (DFNB77), encoding lipoxygenase homology domain 1, is a rare hearing loss gene found in several populations. To evaluate the importance of LOXHD1 variants in Chinese patients with NSHL, we performed genetic analysis on LOXHD1 in 2,901 sporadic Chinese patients to identify the aspect and frequency of LOXHD1 causative variants. Next-generation sequencing using a custom gene panel of HL was conducted on 2,641 unrelated patients and whole-exome sequencing on the remaining 260 patients. A total of 33 likely causative variants were identified in 21 patients, including 20 novel variants and 13 previously reported pathogenic variants. Each of the 20 novel variants was evaluated according to ACMG criteria. These findings showed that causative variants in LOXHD1 were found in about 0.72% (21/2,901) of Chinese NSHL patients. This study is by far the largest number of novel variants identified in this gene expanding the range of pathogenic variants in LOXHD1, and suggests that variants in this gene occur relatively commonly in Chinese NSHL patients. This extensive investigation of LOXHD1 in Chinese NSHL patients proposed six recurrent LOXHD1 variants. These findings may assist in both molecular diagnosis and genetic counseling.
Collapse
Affiliation(s)
- Wei-Qian Wang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China.,Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Xue Gao
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China.,Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Sha-Sha Huang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Dong-Yang Kang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Jin-Cao Xu
- Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Kun Yang
- Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Ming-Yu Han
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Xin Zhang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Su-Yan Yang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Yong-Yi Yuan
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Pu Dai
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| |
Collapse
|
8
|
Ray M, Rath SN, Sarkar S, Sable MN. Presentation of potential genes and deleterious variants associated with non-syndromic hearing loss: a computational approach. Genomics Inform 2022; 20:e5. [PMID: 35399004 PMCID: PMC9001992 DOI: 10.5808/gi.21070] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 02/17/2022] [Indexed: 11/20/2022] Open
Abstract
Non-syndromic hearing loss (NSHL) is a common hereditary disorder. Both clinical and genetic heterogeneity has created many obstacles to understanding the causes of NSHL. The present study has attempted to ravel the genetic aetiology in NSHL progression and to screen out potential target genes using computational approaches. The reported NSHL target genes (2009-2020) have been studied by analyzing different biochemical and signaling pathways, interpretation of their functional association network, and discovery of important regulatory interactions with three previously established miRNAs in the human inner ear as well as in NSHL such as miR-183, miR-182, and miR-96. This study has identified SMAD4 and SNAI2 as the most putative target genes of NSHL. But pathogenic and deleterious non-synonymous single nucleotide polymorphisms discovered within SMAD4 is anticipated to have an impact on NSHL progression. Additionally, the identified deleterious variants in the functional domains of SMAD4 added a supportive clue for further study. Thus, the identified deleterious variant i.e., rs377767367 (G491V) in SMAD4 needs further clinical validation. The present outcomes would provide insights into the genetics of NSHL progression.
Collapse
Affiliation(s)
- Manisha Ray
- Department of Pathology and Lab Medicine, All India Institute of Medical Sciences, Bhubaneswar, Odisha 751019, India
| | - Surya Narayan Rath
- Department of Bioinformatics, Odisha University of Agriculture and Technology, Bhubaneswar, Odisha 751003, India
| | - Saurav Sarkar
- Department of Ear Nose Throat, All India Institute of Medical Sciences, Bhubaneswar, Odisha 751019, India
| | - Mukund Namdev Sable
- Department of Pathology and Lab Medicine, All India Institute of Medical Sciences, Bhubaneswar, Odisha 751019, India
| |
Collapse
|
9
|
Liang J, Yu Z, Wang Z, Chen J, Liu Y, Yin Z, Xu R. A frameshift mutation of TMPRSS3 in a Chinese family with non-syndromic hearing loss. Front Pediatr 2022; 10:1032659. [PMID: 36568422 PMCID: PMC9788774 DOI: 10.3389/fped.2022.1032659] [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] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 11/21/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Deafness is the most common sensory defect in humans worldwide. Approximately 50% of cases are attributed to genetic factors, and about 70% are non-syndromic hearing loss (NSHL). OBJECTIVES To identify clinically relevant gene variants associated with NSHL in a Chinese family using trio-based whole-exome sequencing (WES). MATERIALS AND METHODS WES was performed on the 18-month-old female proband, and her parents. Gene variants specific to the family were identified by bioinformatics analysis and evaluated for their relevance to NSHL. We verified the novel variant in this family by the next-generation sequencing.In order to elucidate the frameshift mutation of TMPRSS3 in a Chinese family, we used the Mass spectrometry to detect the gene from 1,010 healthy subjects. RESULTS We identified a novel homozygous deletion (c.51delA) in exon 2 of the type II transmembrane serine protease 3 gene TMPRSS3, which resulted in a frameshift mutation just before the protein transmembrane domain (p.Q17fs). The deletion was present in the proband and her father, but not in her mother and the healthy controls. We also found mutations with potential relevance to hearing loss in DCAF17, which encodes a protein of unknown function (c. T555A: p.H185Q), and ZNF276, which encodes zinc finger protein 276 (c.1350-2A > G). CONCLUSIONS AND SIGNIFICANCE We shown a novel frameshift mutation in TMPRSS3 associated with autosomal recessive NSHL in a Han Chinese family.
Collapse
Affiliation(s)
- Jingwen Liang
- Clinical Laboratory, Longgang Central Hospital of Shenzhen, Shenzhen, China
| | - Zhuoheng Yu
- Clinical Laboratory, Longgang Central Hospital of Shenzhen, Shenzhen, China
| | - Zhangxing Wang
- Division of Neonatology, Longhua People's Hospital, Shenzhen, China
| | - Jianxia Chen
- Clinical Laboratory, Longgang Central Hospital of Shenzhen, Shenzhen, China
| | - Yihuan Liu
- Clinical Laboratory, Shenzhen Mental Health Center, Shenzhen, China
| | - Zhaoqing Yin
- Division of Pediatrics, The People's Hospital of Dehong Autonomous Prefecture, Dehong Hospital of Kunming Medical University, Mangshi, Yunnan, China
| | - Ruihuan Xu
- Department of Clinical Laboratory, The Second Affiliated Hospital, School of Medicine, The Chinese University of Hong Kong, Shenzhen, P. R. China & Longgang District People's Hospital of Shenzhen, Shenzhen, China
| |
Collapse
|
10
|
Sorrentino U, Piccolo C, Rigon C, Brasson V, Trevisson E, Boaretto F, Martini A, Cassina M. DFNA20/26 and Other ACTG1-Associated Phenotypes: A Case Report and Review of the Literature. Audiol Res 2021; 11:582-93. [PMID: 34698053 DOI: 10.3390/audiolres11040052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 10/10/2021] [Accepted: 10/13/2021] [Indexed: 02/08/2023] Open
Abstract
Since the early 2000s, an ever-increasing subset of missense pathogenic variants in the ACTG1 gene has been associated with an autosomal-dominant, progressive, typically post-lingual non-syndromic hearing loss (NSHL) condition designed as DFNA20/26. ACTG1 gene encodes gamma actin, the predominant actin protein in the cytoskeleton of auditory hair cells; its normal expression and function are essential for the stereocilia maintenance. Different gain-of-function pathogenic variants of ACTG1 have been associated with two major phenotypes: DFNA20/26 and Baraitser-Winter syndrome, a multiple congenital anomaly disorder. Here, we report a novel ACTG1 variant [c.625G>A (p. Val209Met)] in an adult patient with moderate-severe NSHL characterized by a downsloping audiogram. The patient, who had a clinical history of slowly progressive NSHL and tinnitus, was referred to our laboratory for the analysis of a large panel of NSHL-associated genes by next generation sequencing. An extensive review of previously reported ACTG1 variants and their associated phenotypes was also performed.
Collapse
|
11
|
Cenni C, Mansard L, Blanchet C, Baux D, Vaché C, Baudoin C, Moclyn M, Faugère V, Mondain M, Jeziorski E, Roux AF, Willems M. When Familial Hearing Loss Means Genetic Heterogeneity: A Model Case Report. Diagnostics (Basel) 2021; 11:diagnostics11091636. [PMID: 34573976 PMCID: PMC8465614 DOI: 10.3390/diagnostics11091636] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 09/04/2021] [Indexed: 11/29/2022] Open
Abstract
We describe a family with both hearing loss (HL) and thrombocytopenia, caused by pathogenic variants in three genes. The proband was a child with neonatal thrombocytopenia, childhood-onset HL, hyper-laxity and severe myopia. The child’s mother (and some of her relatives) presented with moderate thrombocytopenia and adulthood-onset HL. The child’s father (and some of his relatives) presented with adult-onset HL. An HL panel analysis, completed by whole exome sequencing, was performed in this complex family. We identified three pathogenic variants in three different genes: MYH9, MYO7A and ACTG1. The thrombocytopenia in the child and her mother is explained by the MYH9 variant. The post-lingual HL in the paternal branch is explained by the MYO7A variant, absent in the proband, while the congenital HL of the child is explained by a de novo ACTG1 variant. This family, in which HL segregates, illustrates that multiple genetic conditions coexist in individuals and make patient care more complex than expected.
Collapse
Affiliation(s)
- Camille Cenni
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, CHU Montpellier, Université de Montpellier, 34090 Montpellier, France;
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
| | - Luke Mansard
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
| | - Catherine Blanchet
- Service ORL, CHU Montpellier, Université de Montpellier, 34090 Montpellier, France; (C.B.); (M.M.)
- Centre National de Référence Maladies Rares “Affections Sensorielles Génétiques”, CHU Montpellier, Université de Montpellier, 34090 Montpellier, France
| | - David Baux
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
- INM, Université de Montpellier, INSERM U1298, 34090 Montpellier, France
| | - Christel Vaché
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
- INM, Université de Montpellier, INSERM U1298, 34090 Montpellier, France
| | - Corinne Baudoin
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
| | - Mélodie Moclyn
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
| | - Valérie Faugère
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
| | - Michel Mondain
- Service ORL, CHU Montpellier, Université de Montpellier, 34090 Montpellier, France; (C.B.); (M.M.)
| | - Eric Jeziorski
- Service de Pédiatrie Générale, Infectiologie et Immunologie Clinique, CHU Montpellier, Université de Montpellier, 34090 Montpellier, France;
| | - Anne-Françoise Roux
- Laboratoire de Génétique Moléculaire, CHU Montpellier, Université de Montpellier, 34090 Monpellier, France; (L.M.); (D.B.); (C.V.); (C.B.); (M.M.); (V.F.); (A.-F.R.)
- INM, Université de Montpellier, INSERM U1298, 34090 Montpellier, France
| | - Marjolaine Willems
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, CHU Montpellier, Université de Montpellier, 34090 Montpellier, France;
- Correspondence:
| |
Collapse
|
12
|
Tesolin P, Morgan A, Notarangelo M, Ortore RP, Concas MP, Notarangelo A, Girotto G. Non-Syndromic Autosomal Dominant Hearing Loss: The First Italian Family Carrying a Mutation in the NCOA3 Gene. Genes (Basel) 2021; 12:1043. [PMID: 34356059 PMCID: PMC8304864 DOI: 10.3390/genes12071043] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/01/2021] [Accepted: 07/02/2021] [Indexed: 02/07/2023] Open
Abstract
Hearing loss (HL) is the most frequent sensory disorder, affecting about 1-3 per 1000 live births, with more than half of the cases attributable to genetic causes. Despite the fact that many HL causative genes have already been identified, current genetic tests fail to provide a diagnosis for about 40% of the patients, suggesting that other causes still need to be discovered. Here, we describe a four-generation Italian family affected by autosomal dominant non-syndromic hearing loss (ADNSHL), in which exome sequencing revealed a likely pathogenic variant in NCOA3 (NM_181659.3, c.2909G>C, p.(Gly970Ala)), a gene recently described as a novel candidate for ADNSHL in a Brazilian family. A comparison between the two families highlighted a series of similarities: both the identified variants are missense, localized in exon 15 of the NCOA3 gene and lead to a similar clinical phenotype, with non-syndromic, sensorineural, bilateral, moderate to profound hearing loss, with a variable age of onset. Our findings (i.e., the identification of the second family reported globally with HL caused by a variant in NCOA3) further support the involvement of NCOA3 in the etiopathogenesis of ADNSHL, which should, thus, be considered as a new gene for autosomal dominant non-syndromic hearing loss.
Collapse
Affiliation(s)
- Paola Tesolin
- Department of Medicine, Surgery and Health Sciences, University of Trieste, 34127 Trieste, Italy;
| | - Anna Morgan
- Institute for Maternal and Child Health—I.R.C.C.S. “Burlo Garofolo”, 34137 Trieste, Italy; (A.M.); (M.P.C.)
| | - Michela Notarangelo
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, 38123 Trento, Italy;
| | - Rocco Pio Ortore
- UOC Otolaryngology, Institute I.R.C.C.S. “Casa Sollievo della Sofferenza”, 71013 San Giovanni Rotondo, Italy;
| | - Maria Pina Concas
- Institute for Maternal and Child Health—I.R.C.C.S. “Burlo Garofolo”, 34137 Trieste, Italy; (A.M.); (M.P.C.)
| | - Angelantonio Notarangelo
- UOC Medical Genetics, Institute I.R.C.C.S. “Casa Sollievo della Sofferenza”, 71013 San Giovanni Rotondo, Italy;
| | - Giorgia Girotto
- Department of Medicine, Surgery and Health Sciences, University of Trieste, 34127 Trieste, Italy;
- Institute for Maternal and Child Health—I.R.C.C.S. “Burlo Garofolo”, 34137 Trieste, Italy; (A.M.); (M.P.C.)
| |
Collapse
|
13
|
Liu X, Chen S, Sun Y, Kong W. [Nonsyndromic deafness due to compound heterozygous mutation of the CDH23 gene]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2021; 35:229-233;237. [PMID: 33794607 PMCID: PMC10128237 DOI: 10.13201/j.issn.2096-7993.2021.03.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Indexed: 11/12/2022]
Abstract
Objective:To identify the pathogenic gene mutation of two patients with non-syndromic deafness(NSHL). Methods:Two patient with NSHL and their parents were selected in the research object. Each participant provided 3-5 mL of peripheral venous blood, which was used to establish a DNA library. Next generation sequencing was used to detect the sequence of the patient's genome, and the sequencing results were compared with the human genome sequence (GRCh)37/hg19. Sanger sequencing was used to verify the parents' genome sequence. Finally the patient's pathogenic gene mutation was confirmed.Amino acid conservatism and single nucleotide polymorphisms of the mutant sites were analyzed using a variety of databases and software. Results:The mutation was located to CDH23 gene in the chromosomal location 10q21-q22. Complex heterozygous mutations consist of c. 1343T>C and c. 7991_7993delTCA. Parents are heterozygous carriers of a single mutation. Conclusion:The next generation sequencing technology were used to screen the pathogenic gene mutation of inherited deafness. Combined with the genetic sequencing results of parents, the specific pathogenic gene mutation of deafness patients can be identified. While the pathogenicity of complex heterozygous mutation were explained by various pathogenicity analysis methods.
Collapse
Affiliation(s)
- Xiaozhou Liu
- Department of Otorhinolaryngology Head and Neck Surgery,Union Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430022,China
| | - Sen Chen
- Department of Otorhinolaryngology Head and Neck Surgery,Union Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430022,China
| | - Yu Sun
- Department of Otorhinolaryngology Head and Neck Surgery,Union Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430022,China
| | - Weijia Kong
- Department of Otorhinolaryngology Head and Neck Surgery,Union Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430022,China
| |
Collapse
|
14
|
牛 文, 许 慧, 秦 利, 王 广, 丁 韶, 谢 存, 贾 晓, 刘 宏. [Genotype and clinical phenotype analysis of 42 patients with delayed nonsyndromic hearing loss]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2021; 35:131-136. [PMID: 33540994 PMCID: PMC10127873 DOI: 10.13201/j.issn.2096-7993.2021.02.009] [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] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Indexed: 06/12/2023]
Abstract
Objective:The aim of this study is to analyze the mutation characteristics of GJB2 and SLC26A4 gene in patients with delayed non-syndromic hearing loss, which is beneficial to the early detection and intervention of delayed deafness. Methods:Sanger sequencing technology was used to detect two common genes in 139 patients with non-syndromic deafness, six hot spot mutations in GJB2 gene and SLC26A4 gene, and single heterozygous mutations found in GJB2 gene and SLC26A4 gene were detected by whole exome sequencing. Results:Among the 25 patients with deafness caused by GJB2 gene mutation, 12 of them passed universal newborn hearing screening and then developed delayed extremely severe hearing loss. The onset time of hearing loss was 6-48 months. All the genotypes were homozygous or compound heterozygous mutation of c. 235delC, especially genotype of GJB2 c. 235delC homozygous and c. 235delC/c. 299-300 delAT compound heterozygous mutations, and the CT manifestations were normal. Among the 42 patients with deafness caused by SLC26A4 gene mutation, 30 of them passed universal newborn hearing screening and developed delayed deafness. The onset time of hearing loss was three months to ten years old. Among them, the genotypes of 21 patients were compound heterozygous mutation, and 9 patients were homozygous mutation of c. 919-2A>G, especially genotypes were SLC26A4 c. 919-2A>G/c. 665G>T and c. 919-2A>G /c. 2027T>A compound heterozygous mutation. The CT findings of 19 cases showed single enlarged vestibular aqueduct, and 11 cases showed enlarged vestibular aqueduct with Mondini malformation. Conclusion:For the children who have passed universal newborn hearing screening, the genotypes detected are GJB2 c. 235delC homozygous, SLC26A4 c. 919-2A>G homozygous or compound heterozygous mutations, especially genotypes GJB2 c. 235delC homozygous, c. 235delC/c. 299-300delAT compound heterozygous mutations and SLC26A4 c. 919-2A>G/c. 665G>T and c. 919-2A>G/c. 2027T>A compound heterozygous mutation. Attention should be paid to the hearing problems of children all the time, and the possibility of delayed deafness in the future should be considered.
Collapse
Affiliation(s)
- 文侠 牛
- 河南大学人民医院 河南省人民医院耳鼻咽喉头颈外科(郑州,450003)Department of Otolaryngology Head and Neck Surgery, Henan University People's Hospital, Henan Provincial People's Hospital, Zhengzhou, 450003, China
| | - 慧娟 许
- 河南大学人民医院 河南省人民医院耳鼻咽喉头颈外科(郑州,450003)Department of Otolaryngology Head and Neck Surgery, Henan University People's Hospital, Henan Provincial People's Hospital, Zhengzhou, 450003, China
| | - 利涛 秦
- 河南省人民医院 郑州大学人民医院 河南省医学遗传研究所Henan Provincial People's Hospital, Zhengzhou University People's Hospital, Medical Genetics of Henan Provincial
| | - 广科 王
- 河南省人民医院 郑州大学人民医院 河南大学人民医院耳鼻咽喉头颈外科Department of Otolaryngology Head and Neck Surgery, Henan Provincial People's Hospital, Zhengzhou University People's Hospital, Henan University People's Hospital
| | - 韶洸 丁
- 河南省人民医院 郑州大学人民医院 河南大学人民医院耳鼻咽喉头颈外科Department of Otolaryngology Head and Neck Surgery, Henan Provincial People's Hospital, Zhengzhou University People's Hospital, Henan University People's Hospital
| | - 存存 谢
- 河南省人民医院 郑州大学人民医院 河南大学人民医院耳鼻咽喉头颈外科Department of Otolaryngology Head and Neck Surgery, Henan Provincial People's Hospital, Zhengzhou University People's Hospital, Henan University People's Hospital
| | - 晓东 贾
- 河南省人民医院 郑州大学人民医院 河南大学人民医院耳鼻咽喉头颈外科Department of Otolaryngology Head and Neck Surgery, Henan Provincial People's Hospital, Zhengzhou University People's Hospital, Henan University People's Hospital
| | - 宏建 刘
- 河南省人民医院 郑州大学人民医院 河南大学人民医院耳鼻咽喉头颈外科Department of Otolaryngology Head and Neck Surgery, Henan Provincial People's Hospital, Zhengzhou University People's Hospital, Henan University People's Hospital
| |
Collapse
|
15
|
Al Dhahouri N, Ali A, Hertecant J, Al-Jasmi F. Case Report: Reinterpretation and Reclassification of ARSB:p.Arg159Cys Variant Identified in an Emirati Patient With Hearing Loss Caused by a Pathogenic Variant in the CDH23 Gene. Front Pediatr 2021; 9:803732. [PMID: 35186827 PMCID: PMC8850695 DOI: 10.3389/fped.2021.803732] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 12/16/2021] [Indexed: 01/30/2023] Open
Abstract
Arylsulfatase B is an enzyme present in the lysosomes that involves in the breakdown of large sugar molecules known as glycosaminoglycans (GAGs). Arylsulfatase B chemically modifies two GAGs, namely, dermatan sulfate and chondroitin sulfate, by removing the sulfate group. Mutations in the gene encoding the arylsulfataseB enzyme causes lysosomal storage disorder, mucopolysaccharidosis type VI (MPS VI), or Maroteaux-Lamy syndrome. In this study, we report a case of congenital hearing loss with mild pigmentary changes in the retina, indicative of Usher syndrome, and a missense variant reported as likely pathogenic for MPS VI. Sequencing results identified a pathogenic missense variant p.Arg1746Gln in the CDH23 gene. However, another missense variant ARSB:p.Arg159Cys was reported as likely pathogenic to the treating physician. Mutations in ARSB gene have been associated with MPS VI. Subsequently, ARSB enzyme activity was found low twice in dried blood spot (DBS), suggestive of MPS VI. The patient did not have the clinical features of MPS VI, but considering the wide clinical spectrum, progressive nature of MPS VI, and the fact that a treatment for MPS VI is available to prevent disease progression, further biochemical, enzymatic, and in silico studies were performed to confirm the pathogenicity of this variant. In silico tools predicted this variant to be pathogenic. However, the results of urine and serum GAGs and ARSB enzyme levels measured from patient's fibroblast were found normal. Based on clinical and biochemical findings, ARSB:p.Arg159Cys is likely benign and did not support the diagnosis of MPS VI. However, CDH23:p.Arg1746Gln, a pathogenic variant, supports the underlying cause of hearing loss. This study highlights the importance of a robust correlation between genetic results and clinical presentation, and biochemical and enzymatic studies, to achieve a differential diagnosis.
Collapse
Affiliation(s)
- Nahid Al Dhahouri
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates
| | - Amanat Ali
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates
| | - Jozef Hertecant
- Department of Pediatrics, Tawam Hospital, Al-Ain, United Arab Emirates
| | - Fatma Al-Jasmi
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates.,Department of Pediatrics, Tawam Hospital, Al-Ain, United Arab Emirates
| |
Collapse
|
16
|
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] [What about the content of this article? (0)] [Affiliation(s)] [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.
Collapse
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
| |
Collapse
|
17
|
Su HA, Lai TW, Li SY, Su TR, Yang JJ, Su CC. The Functional Role of CONNEXIN 26 Mutation in Nonsyndromic Hearing Loss, Demonstrated by Zebrafish Connexin 30.3 Homologue Model. Cells 2020; 9:E1291. [PMID: 32455934 DOI: 10.3390/cells9051291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 05/20/2020] [Accepted: 05/20/2020] [Indexed: 01/02/2023] Open
Abstract
Nonsyndromic hearing loss (NSHL) is of great clinical importance, and mutations in the GJB2 gene and the encoded human CONNEXIN 26 (CX26) protein play important roles in the genetic pathogenesis. The CX26 p.R184Q mutation was shown to be a dominant-negative effect in our previous study. Previously, we also demonstrated that zebrafish Cx30.3 is orthologous to human CX26. In the present study, we established transgenic zebrafish models with mutated Cx30.3 specifically expressed in the supporting cells of zebrafish inner ears driven by the agr2 promoter, to demonstrate and understand the mechanism by which the human CX26 R.184 mutation causes NSHL. Our results indicated that significant structural changes in the inner ears of transgenic lines with mutations were measured and compared to wild-type zebrafish. Simultaneously, significant alterations of transgenic lines with mutations in swimming behavior were analyzed with the zebrafish behavioral assay. This is the first study to investigate the functional results of the CX26 p.R184Q mutation with in vivo disease models. Our work supports and confirms the pathogenic role of the CX26 p.R184Q mutation in NSHL, with a hypothesized mechanism of altered interaction among amino acids in the connexins.
Collapse
|
18
|
Oka SI, Day TF, Nishio SY, Moteki H, Miyagawa M, Morita S, Izumi S, Ikezono T, Abe S, Nakayama J, Hyogo M, Okamoto N, Uehara N, Oshikawa C, Kitajiri SI, Usami SI. Clinical Characteristics and In Vitro Analysis of MYO6 Variants Causing Late-Onset Progressive Hearing Loss. Genes (Basel) 2020; 11:genes11030273. [PMID: 32143290 PMCID: PMC7140843 DOI: 10.3390/genes11030273] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 02/26/2020] [Accepted: 02/29/2020] [Indexed: 12/21/2022] Open
Abstract
MYO6 is known as a genetic cause of autosomal dominant and autosomal recessive inherited hearing loss. In this study, to clarify the frequency and clinical characteristics of hearing loss caused by MYO6 gene mutations, a large-scale genetic analysis of Japanese patients with hearing loss was performed. By means of massively parallel DNA sequencing (MPS) using next-generation sequencing for 8074 Japanese families, we found 27 MYO6 variants in 33 families, 22 of which are novel. In total, 2.40% of autosomal dominant sensorineural hearing loss (ADSNHL) in families in this study (32 out of 1336) was found to be caused by MYO6 mutations. The present study clarified that most cases showed juvenile-onset progressive hearing loss and their hearing deteriorated markedly after 40 years of age. The estimated hearing deterioration was found to be 0.57 dB per year; when restricted to change after 40 years of age, the deterioration speed was accelerated to 1.07 dB per year. To obtain supportive evidence for pathogenicity, variants identified in the patients were introduced to MYO6 cDNA by site-directed mutagenesis and overexpressed in epithelial cells. They were then assessed for their effects on espin1-induced microvilli formation. Cells with wildtype myosin 6 and espin1 co-expressed created long microvilli, while co-expression with mutant constructs resulted in severely shortened microvilli. In conclusion, the present data clearly showed that MYO6 is one of the genes to keep in mind with regard to ADSNHL, and the molecular characteristics of the identified gene variants suggest that a possible pathology seems to result from malformed stereocilia of the cochlear hair cells.
Collapse
Affiliation(s)
- Shin-ichiro Oka
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-i.O.); (T.F.D.); (H.M.); (M.M.)
| | - Timothy F. Day
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-i.O.); (T.F.D.); (H.M.); (M.M.)
| | - Shin-ya Nishio
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-i.O.); (T.F.D.); (H.M.); (M.M.)
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
| | - Hideaki Moteki
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-i.O.); (T.F.D.); (H.M.); (M.M.)
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
| | - Maiko Miyagawa
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-i.O.); (T.F.D.); (H.M.); (M.M.)
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
| | - Shinya Morita
- Department of Otolaryngology-Head and Neck Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15, West-7, Sapporo 060-8638, Japan;
| | - Shuji Izumi
- Department of Otolaryngology, Head and Neck Surgery, Niigata University Graduate School of Medical and Dental Sciences, Asahimachi 1, Niigata city, Niigata 951-8510, Japan;
| | - Tetsuo Ikezono
- Department of Otorhinolaryngology, Saitama Medical University Faculty of Medicine, Morohongo 38, Moroyamamachi, Irumagun, Saitama-ken 350-0495, Japan;
| | - Satoko Abe
- Department of Otorhinolaryngology, Toranomon Hosipital, 2-2-2 Toranomon, Minato-ku, Tokyo 105-8470, Japan;
| | - Jun Nakayama
- Department of Otorhinolaryngology, Shiga University School of Medical Science, Seta Tsukinowacho, Otsu 520-2192, Japan;
| | - Misako Hyogo
- Department of Otolaryngology-Head and Neck Surgery, Kyoto Prefectural University of Medicine, 465 Kagii-cho, Kyoto 602-8566, Japan;
| | - Nobuhiko Okamoto
- Department of Medical Genetics, Osaka Women’s and Children’s Hospital, 840 Murodo-cho, Izumi, Osaka 594-1101, Japan;
| | - Natsumi Uehara
- Department of Otolaryngology-Head and Neck Surgery, Kobe University School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan;
| | - Chie Oshikawa
- Department of Otorhinolaryngology-Head and Neck Surgery, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan;
| | - Shin-ichiro Kitajiri
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-i.O.); (T.F.D.); (H.M.); (M.M.)
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
| | - Shin-ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-i.O.); (T.F.D.); (H.M.); (M.M.)
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
- Correspondence: ; Tel.: +81-263-37-2666
| |
Collapse
|
19
|
Mohamed WKE, Mahfood M, Al Mutery A, Abdallah SH, Tlili A. A Novel Nonsense Mutation (c.414G>A; p.Trp138*) in CLDN14 Causes Hearing Loss in Yemeni Families: A Case Report. Front Genet 2019; 10:1087. [PMID: 31781163 PMCID: PMC6856671 DOI: 10.3389/fgene.2019.01087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 10/09/2019] [Indexed: 12/01/2022] Open
Abstract
Non-syndromic hearing loss (NSHL) is a hereditary disorder that affects many populations. Many genes are involved in NSHL and the mutational load of these genes often differs among ethnic groups. Claudin-14 (CLDN14), a tight junction protein, is known to be associated with NSHL in many populations. In this study, we aimed to identify the responsible variants in 3 different Yemeni families affected with NSHL. Firstly, clinical exome sequencing (CES) performed for 3 affected patients from these different families identified a new nonsense variant (c.414G > A) in CLDN14. This variant was then confirmed by Sanger sequencing and PCR-RFLP. Subsequently, four microsatellite markers were used to genotype these families, which revealed a founder effect for this variant. Overall, this study illustrates the implication of the CLDN14 gene in the Yemeni population with NSHL and identifies a new founder variant.
Collapse
Affiliation(s)
- Walaa Kamal Eldin Mohamed
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates.,Departament de Genètica i de Microbiologia, Facultat de Biociències, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Mona Mahfood
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Abdullah Al Mutery
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates.,Human Genetics & Stem Cells Research Group, Research Institute of Sciences & Engineering, University of Sharjah, Sharjah, United Arab Emirates
| | - Sallam Hasan Abdallah
- Human Genetics & Stem Cells Research Group, Research Institute of Sciences & Engineering, University of Sharjah, Sharjah, United Arab Emirates
| | - Abdelaziz Tlili
- Department of Applied Biology, College of Sciences, University of Sharjah, Sharjah, United Arab Emirates.,Human Genetics & Stem Cells Research Group, Research Institute of Sciences & Engineering, University of Sharjah, Sharjah, United Arab Emirates
| |
Collapse
|
20
|
Yasukawa R, Moteki H, Nishio SY, Ishikawa K, Abe S, Honkura Y, Hyogo M, Mihashi R, Ikezono T, Shintani T, Ogasawara N, Shirai K, Yoshihashi H, Ishino T, Otsuki K, Ito T, Sugahara K, Usami SI. The Prevalence and Clinical Characteristics of TECTA-Associated Autosomal Dominant Hearing Loss. Genes (Basel) 2019; 10:genes10100744. [PMID: 31554319 PMCID: PMC6826443 DOI: 10.3390/genes10100744] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 09/10/2019] [Accepted: 09/18/2019] [Indexed: 12/24/2022] Open
Abstract
TECTA is well known as a causative gene for autosomal dominant mid-frequency hearing loss observed in various populations. In this study, we performed next-generation sequencing analysis of a large Japanese hearing loss cohort, including eight hundred and twelve (812) subjects from unrelated autosomal dominant hearing loss families, to estimate the prevalence and phenotype-genotype correlations in patients with TECTA mutations. The prevalence of TECTA mutations in Japanese autosomal dominant sensorineural hearing loss families was found to be 3.2%. With regard to the type of hearing loss, the patients with mutations in the nidogen-like domain or ZA domain of TECTA showed varied audiograms. However, most of the patients with mutations in the ZP domain showed mid-frequency hearing loss. The rate of hearing deterioration in TECTA-associated hearing loss patients and in the normal hearing Japanese control population were the same and regression lines for each group were parallel. We carried out haplotype analysis for four families which had one recurring missense variant, c.5597C>T (p.Thr1866Met). Our results revealed four different haplotypes, suggesting that this mutation occurred independently in each family. In conclusion, TECTA variants represent the second largest cause of autosomal dominant sensorineural hearing loss in Japan. The hearing loss progression observed in the patients with TECTA mutations might reflect presbycusis. The c.5597C>T mutation occurred in a mutational hot spot and is observed in many ethnic populations.
Collapse
Affiliation(s)
- Rika Yasukawa
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
| | - Hideaki Moteki
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
| | - Shin-Ya Nishio
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
| | - Kotaro Ishikawa
- Department of Otolaryngology, National Rehabilitation Center for Persons with Disabilities, 4-1 Namiki, Tokorozawa 359-8555, Japan.
| | - Satoko Abe
- Department of Otorhinolaryngology, Toranomon Hospital, 2-2-2 Toranomon, Tokyo 105-0001, Japan.
| | - Yohei Honkura
- Department of Otolaryngology-Head and Neck Surgery, Tohoku University School of Medicine, 1-1 Seiryomachi, Sendai 980-0872, Japan.
| | - Misako Hyogo
- Department of Otolaryngology-Head and Neck Surgery, Kyoto Prefectural University of Medicine, 465 Kagii-cho, Kyoto 602-8566, Japan.
| | - Ryota Mihashi
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, 67 Asahi-machi, Kurume 830-0011, Japan.
| | - Tetsuo Ikezono
- Department of Otorhinolaryngology, Saitama Medical University, 38 Morohongo, Moroyama 350-0451, Japan.
| | - Tomoko Shintani
- Department of Microbiology, Sapporo Medical University School of Medicine, South-1, West-17, Sapporo 060-8556, Japan.
| | - Noriko Ogasawara
- Department of Microbiology, Sapporo Medical University School of Medicine, South-1, West-17, Sapporo 060-8556, Japan.
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, South-1, West-17, Sapporo 060-556, Japan.
| | - Kyoko Shirai
- Department of Otorhinolaryngology-Head and Neck Surgery, Tokyo Medical University, 6-7-1 Nishi-shinjuku, Tokyo 160-0023, Japan.
| | - Hiroshi Yoshihashi
- Department of Medical Genetics, Tokyo Metropolitan Children's Medical Center, 2-8-29 Musashidai, Tokyo 183-8561, Japan.
| | - Takashi Ishino
- Department of Otorhinolaryngology, Head and Neck Surgery, Hiroshima University Hospital, 1-2-3 Kasumi, Hiroshima 734-0037, Japan.
| | - Koshi Otsuki
- Department of Otolaryngology, Fukushima Medical University, 1 Hikarigaoka, Fukushima 960-1295, Japan.
| | - Tsukasa Ito
- Department of Otolaryngology, Head and Neck Surgery, Yamagata University Faculty of Medicine, 2-2-2 Iida-nishi, Yamagata 990-9585, Japan.
| | - Kazuma Sugahara
- Department of Otolaryngology, Yamaguchi University Graduate School of Medicine, 1-1-1 Minamikogushi, Ube City 755-8505, Japan.
| | - Shin-Ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
| |
Collapse
|
21
|
Maekawa K, Nishio SY, Abe S, Goto SI, Honkura Y, Iwasaki S, Kanda Y, Kobayashi Y, Oka SI, Okami M, Oshikawa C, Sakuma N, Sano H, Shirakura M, Uehara N, Usami SI. Mutational Spectrum and Clinical Features of Patients with LOXHD1 Variants Identified in an 8074 Hearing Loss Patient Cohort. Genes (Basel) 2019; 10:E735. [PMID: 31547530 DOI: 10.3390/genes10100735] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/28/2019] [Accepted: 09/19/2019] [Indexed: 12/16/2022] Open
Abstract
Variants of the LOXHD1 gene, which are expressed in hair cells of the cochlea and vestibule, have been reported to cause a progressive form of autosomal recessive non-syndromic hereditary hearing loss, DFNB77. In this study, genetic screening was conducted on 8074 Japanese hearing loss patients utilizing massively parallel DNA sequencing to identify individuals with LOXHD1 variants and to assess their phenotypes. A total of 28 affected individuals and 21 LOXHD1 variants were identified, among which 13 were novel variants. A recurrent variant c.4212 + 1G > A, only reported in Japanese patients, was detected in 18 individuals. Haplotype analysis implied that this variation occurred in a mutational hot spot, and that multiple ancestors of Japanese population had this variation. Patients with LOXHD1 variations mostly showed early onset hearing loss and presented different progression rates. We speculated that the varying severities and progression rates of hearing loss are the result of environmental and/or other genetic factors. No accompanying symptoms, including vestibular dysfunction, with hearing loss were detected in this study. Few studies have reported the clinical features of LOXHD1-gene associated hearing loss, and this study is by far the largest study focused on the evaluation of this gene.
Collapse
|
22
|
Koohiyan M, Azadegan-Dehkordi F, Koohian F, Abolhasani M, Hashemzadeh-Chaleshtori M. Genetics of hereditary hearing loss in east Iran population: A systematic review of GJB2 mutations. Intractable Rare Dis Res 2019; 8:172-178. [PMID: 31523594 PMCID: PMC6743427 DOI: 10.5582/irdr.2019.01070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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] [Indexed: 12/18/2022] Open
Abstract
Mutations in the GJB2 gene are the most common cause of pre-lingual hearing loss (HL) worldwide. Previous studies have shown the frequency of GJB2 mutations to be 16% in Iran, but varies among different ethnic groups. Here, we have reviewed results from previous published mutation reports to provide a comprehensive collection of data for GJB2 mutations and HL in eastern Iran. We conducted a systematic literature review of PubMed, Google Scholar, Web of Science, and Science Direct databases for articles published before March, 2019. The literature search was performed by 2 independent researchers. The primary data of these studies including the number of samples, allelic frequency, and so on were extracted. Six studies involving 812 unrelated families from four different eastern provinces were included and analyzed for the type and prevalence of GJB2 mutations. A total of 19 different genetic variants were detected. GJB2 mutations were 8.8% in the studied eastern provinces, which was lower than that reported in northern populations of Iran. Moreover, a gradient in the frequency of GJB2 mutations from north to south Iran was observed. c.35delG was the most frequent mutation, accounting for 48.5% % of the populations studied. However, this mutation was absent in the Baluchi population. This review shows that particular rare mutations are frequent in some Iranian ethnic groups, and should be considered for genetic counselling.
Collapse
Affiliation(s)
- Mahbobeh Koohiyan
- Cancer Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Fatemeh Azadegan-Dehkordi
- Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Farideh Koohian
- Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Marziye Abolhasani
- Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Morteza Hashemzadeh-Chaleshtori
- Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
- Address correspondence to:Prof. Morteza Hashezadeh-Chaleshtori, Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Rahmatieh, Shahrekord 8813833435, Iran. E-mail:
| |
Collapse
|
23
|
Xia W, Hu J, Ma J, Huang J, Wang X, Jiang N, Zhang J, Ma Z, Ma D. Novel TRRAP mutation causes autosomal dominant non-syndromic hearing loss. Clin Genet 2019; 96:300-308. [PMID: 31231791 DOI: 10.1111/cge.13590] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 04/09/2019] [Revised: 06/12/2019] [Accepted: 06/20/2019] [Indexed: 12/23/2022]
Abstract
Hereditary non-syndromic hearing loss is the most common inherited sensory defect in humans. More than 40 genes have been identified as causative genes for autosomal dominant non-syndromic hearing loss (ADNSHL), but there are many other candidate genes that remain to be discovered. We aimed to identify the causative gene mutation for post-lingual progressive ADNSHL in a Chinese family. Whole-exome sequencing, bioinformatic analysis, and Sanger sequencing were used to verify the co-segregation of a novel pathogenic variant (NM_ 001244580, c.511C>T, p.Arg171Cys) in the TRansformation/tRanscription domain-Associated Protein gene associated with hearing loss in a three-generation Chinese family with ADNSHL). Additionally, three more novel variants of transformation/transcription domain associated protein (TRRAP) were detected in 66 sporadic cases of hearing loss. Morpholino oligonucleotides knockdown and clustered regularly interspaced short palindromic repeats/Cas9 knockout zebrafish were constructed to validate the genetic findings. Knockdown or knockout of TRRAP resulted in significant defects in the inner ear of zebrafish, indicating that TRRAP plays an important role in inner ear development. In conclusion, TRRAP (NM_ 001244580, c.511C>T, p.Arg171Cys) co-segregated with hearing loss in a Chinese family with ADNSHL, and TRRAP deficiency caused hearing disability in zebrafish, suggesting TRRAP is a gene associated with ADNSHL.
Collapse
Affiliation(s)
- Wenjun Xia
- Institute of Biomedical Science, Fudan University, Shanghai, China
| | - Jiongjiong Hu
- Department of Otorhinolaryngology, Shanghai East Hospital Ji'an Hospital, Shanghai, China
| | - Jing Ma
- ENT Institute and Otorhinolaryngology Department, Affiliated Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China
| | - Jianbo Huang
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, Collaborative Innovation Center of Genetics and Development, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Xu Wang
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, Collaborative Innovation Center of Genetics and Development, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Nan Jiang
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, Collaborative Innovation Center of Genetics and Development, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Jin Zhang
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, Collaborative Innovation Center of Genetics and Development, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Zhaoxin Ma
- Department of Otorhinolaryngology, Shanghai East Hospital, Tongji University, Shanghai, China
| | - Duan Ma
- Institute of Biomedical Science, Fudan University, Shanghai, China.,Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, Collaborative Innovation Center of Genetics and Development, School of Basic Medical Sciences, Fudan University, Shanghai, China
| |
Collapse
|
24
|
Zhou Y, Li C, Li M, Zhao Z, Tian S, Xia H, Liu P, Han Y, Ren R, Chen J, Jia C, Guo W. Mutation analysis of common deafness genes among 1,201 patients with non-syndromic hearing loss in Shanxi Province. Mol Genet Genomic Med 2019; 7:e537. [PMID: 30693673 PMCID: PMC6418354 DOI: 10.1002/mgg3.537] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 04/19/2018] [Revised: 08/12/2018] [Accepted: 11/16/2018] [Indexed: 12/24/2022] Open
Abstract
Background Hearing impairment is one of most frequent birth defects, which affects nearly 1 in every 1,000 live births. However, the molecular etiology of non‐syndromic deafness in China is not well studied. Here, we have investigated the presence of mutations in three genes commonly mutated in non‐syndromic deafness patients in Shanxi Province, which has the highest frequency of birth defects in China. Methods In total, 1,201 unrelated non‐syndromic deafness patients and 300 healthy individuals were enrolled. The hearing ability was confirmed by audiologic evaluation. Three major deafness‐related genes (GJB2, SLC26A4 (PDS), and mtDNA 12S rRNA) of all individuals enrolled were analyzed by Sanger sequencing. Results The results showed that GJB2 mutations accounted for 21.23% (255/1,201) in the patient group, with c.235delC, a hotspot mutation, accounting for 10.99% (132/1,201). Moreover, 11 new GJB2 mutations were identified. SLC26A4 mutations accounted for 9.33% (112/1,201) in the patient group, with IVS7‐2A>G as the most prevalent mutation accounting for 4.75% (57/1,201). In addition, 15 patients (1.25%) were found to carry mtDNA 12S rRNA c.1555A>G mutation, while only two cases had the mtDNA 12S rRNA c.1494C>T. Conclusion In our research, it was found that c.235delC in GJB2 and c.919‐2A>G (IVS7‐2A>G) in SLC26A4 were the highest frequency pathogenic variants in Shanxi Province. Taken together, our data will enrich the database of deafness mutations and will help clinical diagnosis, treatment, and genetic counseling of hearing impairment.
Collapse
Affiliation(s)
- Yongan Zhou
- Shanxi Medical University Second Affiliated Hospital, Taiyuan, Shanxi, China
| | - Chao Li
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Min Li
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Zhonghua Zhao
- Institute of Biomedical Sciences, Shanxi University, Taiyuan, Shanxi, China
| | - Shuxiong Tian
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Hou Xia
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Peixian Liu
- Shanxi Medical University Second Affiliated Hospital, Taiyuan, Shanxi, China
| | - Yaxin Han
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Ruirui Ren
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Jianping Chen
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Caihong Jia
- Shanxi Medical University Second Affiliated Hospital, Taiyuan, Shanxi, China
| | - Wei Guo
- Xinzhou Traditional Chinese Medicine Hospital, Xinzhou, Shanxi, China
| |
Collapse
|
25
|
Li H, Qiu J, Zhu J, Huang Y. Gene mutation analysis and genetic counseling for patients with non-syndromic hearing loss in Linyi region. Exp Ther Med 2018; 17:413-417. [PMID: 30651814 PMCID: PMC6307381 DOI: 10.3892/etm.2018.6927] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 10/25/2018] [Indexed: 11/06/2022] Open
Abstract
Through gene mutation analysis of patients with non-syndromic hearing loss (NSHL) correct genetic counseling for patients with NSHL and their family members were provided. A total of 116 patients suffering from NSHL were selected, and Sanger sequencing was applied to analyze 31 mutation sites in four deafness genes [gap junction β-2 (GJB2), solute carrier family 26, member 4 (SLC26A4), GJB3 and mitochondria 12S ribosomal ribonucleic acid (12SrRNA)]. Based on detection results, for the families with reproductive needs, amniotic fluid was extracted from pregnant women during proper gestational weeks to identify fetal genotypes and predict hearing state. Among 116 patients with NSHL, 51 patients carrying definite pathogenic mutation were found, including 35 patients with GJB2 mutations, 14 patients with SLC26A4 gene mutations and 2 patients with mitochondrial deoxyribonucleic acid 12SrRNA (mtDNA 12SrRNA) mutations. No GJB3 gene mutation site was detected. In addition, prenatal diagnosis to 17 pregnant women who had given birth to babies with deafness was performed, and results suggested that genotypes of 6 fetuses were consistent with those of probands, genotypes of 8 fetuses were consistent with those of their parents, and no mutation was found in the other 3 fetuses. Gene mutation analysis of patients with NSHL can identify the etiology and provide appropriate genetic counseling and birth guiding for patients with NSHL and their family members. In addition, prenatal diagnosis to the families who plan to give birth again can avoid the natality of fetuses with hearing loss.
Collapse
Affiliation(s)
- Huafeng Li
- Genetics Laboratory, Women and Children's Health Care Hospital of Linyi, Linyi, Shandong 276014, P.R. China
| | - Jigang Qiu
- Genetics Laboratory, Women and Children's Health Care Hospital of Linyi, Linyi, Shandong 276014, P.R. China
| | - Jinping Zhu
- Genetics Laboratory, Women and Children's Health Care Hospital of Linyi, Linyi, Shandong 276014, P.R. China
| | - Yuqiang Huang
- Genetics Laboratory, Women and Children's Health Care Hospital of Linyi, Linyi, Shandong 276014, P.R. China
| |
Collapse
|
26
|
Booth KT, Kahrizi K, Najmabadi H, Azaiez H, Smith RJ. Old gene, new phenotype: splice-altering variants in CEACAM16 cause recessive non-syndromic hearing impairment. J Med Genet 2018; 55:555-560. [PMID: 29703829 PMCID: PMC6060001 DOI: 10.1136/jmedgenet-2018-105349] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/03/2018] [Accepted: 04/07/2018] [Indexed: 12/14/2022]
Abstract
BACKGROUND Hearing loss is a genetically and phenotypically heterogeneous disorder. OBJECTIVES The purpose of this study was to determine the genetic cause underlying the postlingual progressive hearing loss in two Iranian families. METHODS We used OtoSCOPE, a next-generation sequencing platform targeting >150 genes causally linked to deafness, to screen two deaf probands. Data analysis was completed using a custom bioinformatics pipeline, and variants were functionally assessed using minigene splicing assays. RESULTS We identified two homozygous splice-altering variants (c.37G>T and c.662-1G>C) in the CEACAM16 gene, segregating with the deafness in each family. The minigene splicing results revealed the c.37G>T results in complete skipping of exon 2 and loss of the AUG start site. The c.662-1G>C activates a cryptic splice site inside exon 5 resulting in a shift in the mRNA reading frame. CONCLUSIONS These results suggest that loss-of-function mutations in CEACAM16 result in postlingual progressive hearing impairment and further support the role of CEACAM16 in auditory function.
Collapse
Affiliation(s)
- Kevin T Booth
- Molecular Otolaryngology Renal Research Laboratories, Department of Otolaryngology-Head Neck Surgery, University of Iowa, Iowa City, Iowa
- The Interdisciplinary Graduate Program in Molecular Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Hela Azaiez
- Molecular Otolaryngology Renal Research Laboratories, Department of Otolaryngology-Head Neck Surgery, University of Iowa, Iowa City, Iowa
| | - Richard J Smith
- Molecular Otolaryngology Renal Research Laboratories, Department of Otolaryngology-Head Neck Surgery, University of Iowa, Iowa City, Iowa
- The Interdisciplinary Graduate Program in Molecular Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa
| |
Collapse
|
27
|
Booth KT, Kahrizi K, Babanejad M, Daghagh H, Bademci G, Arzhangi S, Zareabdollahi D, Duman D, El-Amraoui A, Tekin M, Najmabadi H, Azaiez H, Smith RJ. Variants in CIB2 cause DFNB48 and not USH1J. Clin Genet 2018; 93:812-821. [PMID: 29112224 PMCID: PMC5851821 DOI: 10.1111/cge.13170] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [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: 09/04/2017] [Revised: 10/31/2017] [Accepted: 11/02/2017] [Indexed: 12/16/2022]
Abstract
The genetic, mutational and phenotypic spectrum of deafness-causing genes shows great diversity and pleiotropy. The best examples are the group of genes, which when mutated can either cause non-syndromic hearing loss (NSHL) or the most common dual sensory impairment, Usher syndrome (USH). Variants in the CIB2 gene have been previously reported to cause hearing loss at the DFNB48 locus and deaf-blindness at the USH1J locus. In this study, we characterize the phenotypic spectrum in a multiethnic cohort with autosomal recessive non-syndromic hearing loss (ARNSHL) due to variants in the CIB2 gene. Of the 6 families we ascertained, 3 segregated novel loss-of-function (LOF) variants, 2 families segregated missense variants (1 novel) and 1 family segregated a previously reported pathogenic variant in trans with a frameshift variant. This report is the first to show that biallelic LOF variants in CIB2 cause ARNSHL and not USH. In the era of precision medicine, providing the correct diagnosis (NSHL vs USH) is essential for patient care as it impacts potential intervention and prevention options for patients. Here, we provide evidence disqualifying CIB2 as an USH-causing gene.
Collapse
Affiliation(s)
- Kevin T Booth
- Molecular Otolaryngology and Renal Research Laboratories, Department of Otolaryngology- Head and Neck Surgery, University of Iowa, Iowa City, Iowa
- Department of Molecular Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Mojgan Babanejad
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Hossein Daghagh
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Guney Bademci
- John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, Florida
| | - Sanaz Arzhangi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Davood Zareabdollahi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Duygu Duman
- Division of Pediatric Genetics, Ankara University School of Medicine, Ankara, Turkey
| | - Aziz El-Amraoui
- Institut Pasteur, Génétique et Physiologie de l’Audition, INSERM UMRS1120, UPMC Univ Paris06, 75015 Paris, France
| | - Mustafa Tekin
- John P. Hussman Institute for Human Genomics, Dr. John T. Macdonald Foundation Department of Human Genetics, and Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Hela Azaiez
- Molecular Otolaryngology and Renal Research Laboratories, Department of Otolaryngology- Head and Neck Surgery, University of Iowa, Iowa City, Iowa
| | - Richard J Smith
- Molecular Otolaryngology and Renal Research Laboratories, Department of Otolaryngology- Head and Neck Surgery, University of Iowa, Iowa City, Iowa
| |
Collapse
|
28
|
Hao Y, Chen D, Zhang Z, Zhou P, Cao Y, Wei Z, Xu X, Chen B, Zou W, Lv M, Ji D, He X. Successful preimplantation genetic diagnosis by targeted next-generation sequencing on an ion torrent personal genome machine platform. Oncol Lett 2018. [PMID: 29541197 PMCID: PMC5835955 DOI: 10.3892/ol.2018.7876] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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] [Indexed: 11/05/2022] Open
Abstract
Hearing loss may place a heavy burden on the patient and patient's family. Given the high incidence of hearing loss among newborns and the huge cost of treatment and care (including cochlear implantation), prenatal diagnosis is strongly recommended. Termination of the fetus may be considered as an extreme outcome to the discovery of a potential deaf fetus, and therefore preimplantation genetic diagnosis has become an important option for avoiding the birth of affected children without facing the risk of abortion following prenatal diagnosis. In one case, a couple had a 7-year-old daughter affected by non-syndromic sensorineural hearing loss. The affected fetus carried a causative compound heterozygous mutation c.919-2 A>G (IVS7-2 A>G) and c.1707+5 G>A (IVS15+5 G>A) of the solute carrier family 26 member 4 gene inherited from maternal and paternal sides, respectively. The present study applied multiple displacement amplification for whole genome amplification of biopsied trophectoderm cells and next-generation sequencing (NGS)-based single nucleotide polymorphism haplotyping on an Ion Torrent Personal Genome Machine. One unaffected embryo was transferred in a frozen-thawed embryo transfer cycle and the patient was impregnated. To conclude, to the best of our knowledge, this may be the first report of NGS-based preimplantation genetic diagnosis (PGD) for non-syndromic hearing loss caused by a compound heterozygous mutation using an Ion Torrent Personal Genome Machine. NGS provides unprecedented high-throughput, highly parallel and base-pair resolution data for genetic analysis. The method meets the requirements of medium-sized diagnostics laboratories. With decreased costs compared with previous techniques (such as Sanger sequencing), this technique may have potential widespread clinical application in PGD of other types of monogenic disease.
Collapse
Affiliation(s)
- Yan Hao
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Dawei Chen
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Zhiguo Zhang
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Ping Zhou
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Yunxia Cao
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Zhaolian Wei
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Xiaofeng Xu
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Beili Chen
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Weiwei Zou
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Mingrong Lv
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Dongmei Ji
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| | - Xiaojin He
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Institute of Reproductive Genetics, Anhui Medical University, Hefei, Anhui 230022, P.R. China.,Anhui Province Key Laboratory of Reproductive Health and Genetics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
| |
Collapse
|
29
|
Booth KT, Azaiez H, Kahrizi K, Wang D, Zhang Y, Frees K, Nishimura C, Najmabadi H, Smith RJ. Exonic mutations and exon skipping: Lessons learned from DFNA5. Hum Mutat 2018; 39:433-440. [PMID: 29266521 PMCID: PMC5805621 DOI: 10.1002/humu.23384] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [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: 10/16/2017] [Revised: 11/27/2017] [Accepted: 12/12/2017] [Indexed: 02/06/2023]
Abstract
Dysregulation of splicing is a common factor underlying many inherited diseases including deafness. For one deafness-associated gene, DFNA5, perturbation of exon 8 splicing results in a constitutively active truncated protein. To date, only intronic mutations have been reported to cause exon 8 skipping in patients with DFNA5-related deafness. In five families with postlingual progressive autosomal dominant non-syndromic hearing loss, we employed two next-generation sequencing platforms-OtoSCOPE and whole exome sequencing-followed by variant filtering and prioritization based on both minor allele frequency and functional consequence using a customized bioinformatics pipeline to identify three novel and two recurrent mutations in DFNA5 that segregated with hearing loss in these families. The three novel mutations are all missense variants within exon 8 that are predicted computationally to decrease splicing efficiency or abolish it completely. We confirmed their functional impact in vitro using mini-genes carrying each mutant DFNA5 exon 8. In so doing, we present the first exonic mutations in DFNA5 to cause deafness, expand the mutational spectrum of DFNA5-related hearing loss, and highlight the importance of assessing the effect of coding variants on splicing.
Collapse
Affiliation(s)
- Kevin T Booth
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
- The Interdisciplinary Graduate Program in Molecular Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa
| | - Hela Azaiez
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Donghong Wang
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Yuzhou Zhang
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Kathy Frees
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Carla Nishimura
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Richard J Smith
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| |
Collapse
|
30
|
Roesch S, Bernardinelli E, Nofziger C, Tóth M, Patsch W, Rasp G, Paulmichl M, Dossena S. Functional Testing of SLC26A4 Variants-Clinical and Molecular Analysis of a Cohort with Enlarged Vestibular Aqueduct from Austria. Int J Mol Sci 2018; 19:ijms19010209. [PMID: 29320412 PMCID: PMC5796158 DOI: 10.3390/ijms19010209] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 12/20/2017] [Accepted: 12/28/2017] [Indexed: 12/29/2022] Open
Abstract
The prevalence and spectrum of sequence alterations in the SLC26A4 gene, which codes for the anion exchanger pendrin, are population-specific and account for at least 50% of cases of non-syndromic hearing loss associated with an enlarged vestibular aqueduct. A cohort of nineteen patients from Austria with hearing loss and a radiological alteration of the vestibular aqueduct underwent Sanger sequencing of SLC26A4 and GJB2, coding for connexin 26. The pathogenicity of sequence alterations detected was assessed by determining ion transport and molecular features of the corresponding SLC26A4 protein variants. In this group, four uncharacterized sequence alterations within the SLC26A4 coding region were found. Three of these lead to protein variants with abnormal functional and molecular features, while one should be considered with no pathogenic potential. Pathogenic SLC26A4 sequence alterations were only found in 12% of patients. SLC26A4 sequence alterations commonly found in other Caucasian populations were not detected. This survey represents the first study on the prevalence and spectrum of SLC26A4 sequence alterations in an Austrian cohort and further suggests that genetic testing should always be integrated with functional characterization and determination of the molecular features of protein variants in order to unequivocally identify or exclude a causal link between genotype and phenotype.
Collapse
Affiliation(s)
- Sebastian Roesch
- Department of Otorhinolaryngology, Head and Neck Surgery, Paracelsus Medical University, Müllner Hauptstraße 48, A-5020 Salzburg, Austria.
| | - Emanuele Bernardinelli
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Strubergasse 21, A-5020 Salzburg, Austria.
| | - Charity Nofziger
- PharmGenetix Gmbh, Sonystrasse 20, A-5081 Niederalm Anif, Austria.
| | - Miklós Tóth
- Department of Otorhinolaryngology, Head & Neck Surgery and Oncology, University Medical Center Hamburg-Eppendorf, Martinistraße 52, D-20251 Hamburg, Germany.
| | - Wolfgang Patsch
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Strubergasse 21, A-5020 Salzburg, Austria.
| | - Gerd Rasp
- Department of Otorhinolaryngology, Head and Neck Surgery, Paracelsus Medical University, Müllner Hauptstraße 48, A-5020 Salzburg, Austria.
| | - Markus Paulmichl
- Center for Health and Bioresources, Austrian Institute of Technology, Muthgasse 11, A-1190 Vienna, Austria.
| | - Silvia Dossena
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Strubergasse 21, A-5020 Salzburg, Austria.
| |
Collapse
|
31
|
Guan J, Wang H, Lan L, Wang L, Yang J, Xie L, Yin Z, Xiong W, Zhao L, Wang D, Wang Q. Novel recessive PDZD7 biallelic mutations in two Chinese families with non-syndromic hearing loss. Am J Med Genet A 2017; 176:99-106. [PMID: 29048736 PMCID: PMC5765442 DOI: 10.1002/ajmg.a.38477] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 10/10/2016] [Revised: 08/16/2017] [Accepted: 08/21/2017] [Indexed: 11/17/2022]
Abstract
Autosomal recessive non‐syndromic hearing loss (ARNSHL) is a highly heterogeneous genetic condition. PDZD7 has emerged as a new genetic etiology of ARNSHL. Biallelic mutations in the PDZD7 gene have been reported in two German families, four Iranian families, and a Pakistani family with ARNSHL. The effect of PDZD7 on ARNSHL in other population has yet to be elucidated. Two Chinese ARNSHL families, each of which had two affected siblings, were included in this study. The families underwent target region capture and high‐throughput sequencing to analyze the exonic, splice‐site, and intronic sequences of 128 genes. Furthermore, 1751 normal Chinese individuals served as controls, and 122 Chinese families segregating with apparent ARNSHL, who had been previously excluded for variants in the common deafness genes GJB2 and SLC26A4, were subjected to screening for candidate mutations. We identified a novel homozygous missense mutation (p.Arg66Leu) and novel compound heterozygous frameshift mutations (p.Arg56fsTer24 and p.His403fsTer36) in Chinese families with ARNSHL. This is the first report to identify PDZD7 as an ARNSHL‐associated gene in the Chinese population. Our finding could expand the pathogenic spectrum and strengthens the clinical diagnostic role of the PDZD7 gene in ARNSHL patients.
Collapse
Affiliation(s)
- Jing Guan
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Hongyang Wang
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Lan Lan
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Li Wang
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Ju Yang
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Linyi Xie
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Zifang Yin
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Wenping Xiong
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Lidong Zhao
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Dayong Wang
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| | - Qiuju Wang
- Chinese PLA Institute of Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China
| |
Collapse
|
32
|
Booth KT, Azaiez H, Kahrizi K, Simpson AC, Tollefson WTA, Sloan CM, Meyer NC, Babanejad M, Ardalani F, Arzhangi S, Schnieders MJ, Najmabadi H, Smith RJH. PDZD7 and hearing loss: More than just a modifier. Am J Med Genet A 2015; 167A:2957-65. [PMID: 26416264 DOI: 10.1002/ajmg.a.37274] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [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: 04/30/2015] [Accepted: 07/16/2015] [Indexed: 12/24/2022]
Abstract
Deafness is the most frequent sensory disorder. With over 90 genes and 110 loci causally implicated in non-syndromic hearing loss, it is phenotypically and genetically heterogeneous. Here, we investigate the genetic etiology of deafness in four families of Iranian origin segregating autosomal recessive non-syndromic hearing loss (ARNSHL). We used a combination of linkage analysis, homozygosity mapping, and a targeted genomic enrichment platform to simultaneously screen 90 known deafness-causing genes for pathogenic variants. Variant segregation was confirmed by Sanger sequencing. Linkage analysis and homozygosity mapping showed segregation with the DFNB57 locus on chromosome 10 in two families. Targeted genomic enrichment with massively parallel sequencing identified causal variants in PDZD7: a homozygous missense variant (p.Gly103Arg) in one family and compound heterozygosity for missense (p.Met285Arg) and nonsense (p.Tyr500Ter) variants in the second family. Screening of two additional families identified two more variants: (p.Gly228Arg) and (p.Gln526Ter). Variant segregation with the hearing loss phenotype was confirmed in all families by Sanger sequencing. The missense variants are predicted to be deleterious, and the two nonsense mutations produce null alleles. This report is the first to show that mutations in PDZD7 cause ARNSHL, a finding that offers addition insight into the USH2 interactome. We also describe a novel likely disease-causing mutation in CIB2 and illustrate the complexity associated with gene identification in diseases that exhibit large genetic and phenotypic heterogeneity.
Collapse
Affiliation(s)
- Kevin T Booth
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Hela Azaiez
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Allen C Simpson
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | | | - Christina M Sloan
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Nicole C Meyer
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| | - Mojgan Babanejad
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Fariba Ardalani
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Sanaz Arzhangi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | | | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Richard J H Smith
- Department of Otolaryngology-Head Neck Surgery, Molecular Otolaryngology Renal Research Laboratories, University of Iowa, Iowa City, Iowa
| |
Collapse
|
33
|
Wingard JC, Zhao HB. Cellular and Deafness Mechanisms Underlying Connexin Mutation-Induced Hearing Loss - A Common Hereditary Deafness. Front Cell Neurosci 2015; 9:202. [PMID: 26074771 PMCID: PMC4448512 DOI: 10.3389/fncel.2015.00202] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [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: 04/05/2015] [Accepted: 05/11/2015] [Indexed: 11/30/2022] Open
Abstract
Hearing loss due to mutations in the connexin gene family, which encodes gap junctional proteins, is a common form of hereditary deafness. In particular, connexin 26 (Cx26, GJB2) mutations are responsible for ~50% of non-syndromic hearing loss, which is the highest incidence of genetic disease. In the clinic, Cx26 mutations cause various auditory phenotypes ranging from profound congenital deafness at birth to mild, progressive hearing loss in late childhood. Recent experiments demonstrate that congenital deafness mainly results from cochlear developmental disorders rather than hair cell degeneration and endocochlear potential reduction, while late-onset hearing loss results from reduction of active cochlear amplification, even though cochlear hair cells have no connexin expression. However, there is no apparent, demonstrable relationship between specific changes in connexin (channel) functions and the phenotypes of mutation-induced hearing loss. Moreover, new experiments further demonstrate that the hypothesized K+-recycling disruption is not a principal deafness mechanism for connexin deficiency induced hearing loss. Cx30 (GJB6), Cx29 (GJC3), Cx31 (GJB3), and Cx43 (GJA1) mutations can also cause hearing loss with distinct pathological changes in the cochlea. These new studies provide invaluable information about deafness mechanisms underlying connexin mutation-induced hearing loss and also provide important information for developing new protective and therapeutic strategies for this common deafness. However, the detailed cellular mechanisms underlying these pathological changes remain unclear. Also, little is known about specific mutation-induced pathological changes in vivo and little information is available for humans. Such further studies are urgently required.
Collapse
Affiliation(s)
- Jeffrey C Wingard
- Department of Otolaryngology, University of Kentucky Medical Center , Lexington, KY , USA
| | - Hong-Bo Zhao
- Department of Otolaryngology, University of Kentucky Medical Center , Lexington, KY , USA
| |
Collapse
|
34
|
Faletra F, Girotto G, D'Adamo AP, Vozzi D, Morgan A, Gasparini P. A novel P2RX2 mutation in an Italian family affected by autosomal dominant nonsyndromic hearing loss. Gene 2013; 534:236-9. [PMID: 24211385 DOI: 10.1016/j.gene.2013.10.052] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [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: 08/09/2013] [Revised: 10/09/2013] [Accepted: 10/24/2013] [Indexed: 01/20/2023]
Abstract
Hereditary hearing loss (HHL) is a common disorder accounting for at least 60% of prelingual deafness. It is characterized by a large genetic heterogeneity, and despite the presence of a major gene, still there is a need to search for new causative mutations/genes. Very recently, a mutation within ATP-gated P2X(2) receptor (ligand-gated ion channel, purinergic receptor 2) gene (P2RX2) at DNFA41 locus has been reported leading to a bilateral and symmetrical sensorineural non-syndromic autosomal dominant HHL in two Chinese families. We performed a linkage analysis in a large Italian family with a dominant pattern of inheritance showing a significant 3.31 LOD score in a 2Mb region overlapping with the DNFA41 locus. Molecular analyses of P2RX2 identified a novel missense mutation (p.Gly353Arg) affecting a residue highly conserved across species. Visual inspection of the protein structure as obtained from comparative modeling suggests that substitution of the small glycine residue with a charged bulky residue such as an arginine that is close to the 'neck' of the region responsible for ion channel gating should have a high energetic cost and should lead to a severely destabilization of the fold. The identification of a second most likely causative mutation in P2RX2 gene further supports the possible role of this gene in causing autosomal dominant HHL.
Collapse
Affiliation(s)
- Flavio Faletra
- Institute for Maternal and Child Health, IRCCS "Burlo Garofolo", Via dell'Istria, 34137 Trieste, Italy.
| | | | | | - Diego Vozzi
- Institute for Maternal and Child Health, IRCCS "Burlo Garofolo", Via dell'Istria, 34137 Trieste, Italy.
| | | | - Paolo Gasparini
- Institute for Maternal and Child Health, IRCCS "Burlo Garofolo", Via dell'Istria, 34137 Trieste, Italy; University of Trieste, Trieste, Italy.
| |
Collapse
|
35
|
Kabahuma RI, Ouyang X, Du LL, Yan D, Hutchin T, Ramsay M, Penn C, Liu XZ. Absence of GJB2 gene mutations, the GJB6 deletion (GJB6-D13S1830) and four common mitochondrial mutations in nonsyndromic genetic hearing loss in a South African population. Int J Pediatr Otorhinolaryngol 2011; 75:611-7. [PMID: 21392827 PMCID: PMC4303037 DOI: 10.1016/j.ijporl.2011.01.029] [Citation(s) in RCA: 42] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 01/19/2011] [Accepted: 01/21/2011] [Indexed: 10/18/2022]
Abstract
OBJECTIVE The purpose of this study was to determine the prevalence of mutations in the GJB2 gene, the GJB6-D13S1830 deletion and the four common mitochondrial mutations (A1555G, A3243G, A7511C and A7445G) in a South African population. METHODS Using single-strand conformation polymorphism and direct sequencing for screening GJB2 mutation; Multiplex PCR Amplification for GJB6-D13S1830 deletion and Restriction Fragment-Length Polymorphism (PCR-RFLP) analysis for the four common mtDNA mutations. We screened 182 hearing impaired students to determine the frequency of these mutations in the population. RESULTS None of the reported disease causing mutations in GJB2 nor any novel pathogenic mutations in the coding region were detected, in contrast to the findings among Caucasians. The GJB6-D13S1830 deletion and the mitochondrial mutations were not observed in this group. CONCLUSION These results suggest that GJB2 may not be a significant deafness gene among sub-Saharan Africans, pointing to other unidentified genes as responsible for nonsyndromic hearing loss in these populations.
Collapse
Affiliation(s)
- Rosemary I. Kabahuma
- Department of Speech Pathology and Audiology, University of Witwatersrand, Johannesburg, South Africa,Division of Human Genetics, National Health Laboratory Service and School of Pathology, University of Witwatersrand, Johannesburg, South Africa,Department of Otorhinolaryngology, Polokwane/Mankweng Hospital Complex, Polokwane, Limpopo Province, South Africa
| | - Xiaomei Ouyang
- Department of Otolaryngology, University of Miami, Miami, FL, USA
| | - Li Lin Du
- Department of Otolaryngology, University of Miami, Miami, FL, USA
| | - Denise Yan
- Department of Otolaryngology, University of Miami, Miami, FL, USA
| | - Tim Hutchin
- Birmingham Children’s Hospital, Birmingham, UK
| | - Michele Ramsay
- Division of Human Genetics, National Health Laboratory Service and School of Pathology, University of Witwatersrand, Johannesburg, South Africa,Corresponding author at: Division of Human Genetics, National Health Laboratory Service and School of Pathology, University of Witwatersrand, PO Box 1038, Johannesburg 2000, South Africa. Tel.: +27 011 489 9214; fax: +27 011 498 9226. (M. Ramsay)
| | - Claire Penn
- Department of Speech Pathology and Audiology, University of Witwatersrand, Johannesburg, South Africa
| | - Xue-Zhong Liu
- Department of Otolaryngology, University of Miami, Miami, FL, USA,Corresponding author at: Department of Otolaryngology (D-48), University of Miami, 1666 NW 12th Avenue, Miami, FL 33136, USA. Tel.: +1 305 243 5695; fax: +1 305 243 4925. (X.-Z. Liu)
| |
Collapse
|