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Zhou S, Chen M, Pei J, Zhang C, Ren X, Li J, Sa Y, Zhu B, Li Y. Distribution of mitochondrial MT-RNR1, MT-TL1, MT-TS1, MT-TK and MT-TE genes variants associated with hearing loss in Southwestern China. Int J Pediatr Otorhinolaryngol 2024; 181:111979. [PMID: 38739980 DOI: 10.1016/j.ijporl.2024.111979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 04/21/2024] [Accepted: 05/08/2024] [Indexed: 05/16/2024]
Abstract
BACKGROUND Maternally inherited hearing loss has been associated with mitochondrial genes, including MT-RNR1, MT-TL1, MT-TS1, MT-TK and MT-TE. Among these genes, MT-RNR1 is known to be a hotspot for pathogenic variants related to aminoglycoside ototoxicity and nonsyndromic hearing loss. However, the frequency and spectrum of variants in these genes, particularly in multi-ethnic hearing loss patients from Southwestern China, are still not fully understood. METHODS In this study, we enrolled 460 hearing loss patients from various ethnic backgrounds (Han, Yi, Dai, Hani, etc.) in Southwestern China. Next-generation sequencing was used to analyze the mitochondrial MT-RNR1, MT-TL1, MT-TS1, MT-TK and MT-TE genes. Subsequently, bioinformatical methods were employed to evaluate the identified variants. RESULTS Among the patients with hearing loss, we identified 70 variants in MT-RNR1 (78.6 %, 55/70), MT-TL1 (4.3 %, 3/70), MT-TS1 (4.3 %, 3/70), MT-TK (7.1 %, 5/70) and MT-TE (5.7 %, 4/70) genes. We found that 15 variants were associated with hearing loss, including m.1555 A > G and m.1095 T > C. Additionally, we discovered three reported mitochondrial variants (m.676 G > A, m.7465 insC, and m.7474 A > G) newly correlated with hearing loss. Notably, certain pathogenic variants, such as m.1555 A > G, displayed non-consistent distributions among the multi-ethnic patients with hearing loss. Furthermore, the number of variants associated with hearing loss was higher in the Sinitic group (n = 181) and Tibeto-Burman group (n = 215) compared to the Kra-Dai group (n = 38) and Hmong-Mien group (n = 26). CONCLUSIONS This present study revealed the distribution of mitochondrial variants linked to hearing loss across various ethnic groups in Southwestern China. These data suggest a potential correlation between the distribution of mitochondrial variants associated with hearing loss and ethnic genetic backgrounds.
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Affiliation(s)
- Shiyu Zhou
- Department of Medical Genetics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Menglan Chen
- Department of Medical Genetics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Jiahong Pei
- The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Chen Zhang
- Department of Medical Genetics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Xiaofei Ren
- Department of Medical Genetics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Jingyu Li
- Department of Medical Genetics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Yaliang Sa
- The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China.
| | - Baosheng Zhu
- Department of Medical Genetics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China; National Health Commission Key Laboratory of Healthy Birth and Birth Defect Prevention in Western China, Kunming, Yunnan, China.
| | - Yunlong Li
- Department of Medical Genetics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China; National Health Commission Key Laboratory of Healthy Birth and Birth Defect Prevention in Western China, Kunming, Yunnan, China.
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Wang L, Liu G, Ma D, Zeng H, Wang Y, Luo C, Zhang J, Xu Z. Next-generation sequencing for genetic testing of hearing loss populations. Clin Chim Acta 2024; 552:117693. [PMID: 38056549 DOI: 10.1016/j.cca.2023.117693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 12/03/2023] [Accepted: 12/03/2023] [Indexed: 12/08/2023]
Abstract
BACKGROUND AND AIMS Hearing loss is a common sensorineural disease with genetic heterogeneity. More than 140 genes are known to cause hereditary hearing loss. We aim to uncover the etiologies of hearing loss and provide patients with reasonable reproductive choices. MATERIALS AND METHODS Total 825 participants were recruited, including 74 individuals, 47 couples, and 219 families, to identify the molecular etiologies of hearing loss using next-generation sequencing (NGS). Novel mutations were verified with a minigene splicing assay and the construction of three-dimensional protein models. RESULTS A positive molecular diagnosis was obtained for 244 patients, a rate of 63.05 %. Total 470 mutations were identified in 18 causative genes in positive patients. The most common genes mutated were GJB2 and SLC26A4. 47 novel mutations were identified. Further analysis predicted that two splicing mutations would cause abnormal mRNA splicing and three missense mutations would affect the protein structure. The results of prenatal diagnosis showed that the genotypes of 15 fetuses were the same as the probands. CONCLUSION Our findings expand the mutation spectrum of hearing loss and highlight the importance of genetic diagnosis and prenatal diagnosis to allow accurate and personalized guidance for those at high risk of deafness.
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Affiliation(s)
- Lulu Wang
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Gang Liu
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Dingyuan Ma
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Huasha Zeng
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Yuguo Wang
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Chunyu Luo
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Jingjing Zhang
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China.
| | - Zhengfeng Xu
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China.
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周 睿, 关 静, 王 秋. [Genetic characteristic analysis of slight-to-moderate sensorineural hearing loss in children]. LIN CHUANG ER BI YAN HOU TOU JING WAI KE ZA ZHI = JOURNAL OF CLINICAL OTORHINOLARYNGOLOGY, HEAD, AND NECK SURGERY 2024; 38:18-22. [PMID: 38297844 PMCID: PMC11116154 DOI: 10.13201/j.issn.2096-7993.2024.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Indexed: 02/02/2024]
Abstract
Objective:To analyze genetic factors and phenotype characteristics in pediatric population with slight-to-moderate sensorineural hearing loss. Methods:Children with slight-to-moderate sensorineural hearing loss of and their parents, enrolled from the Chinese Deafness Genome Project, were studied. Hearing levels were assessed using pure tone audiometry, behavioral audiometry, auditory steady state response(ASSR), auditory brainstem response(ABR) thresholds, and deformed partial otoacoustic emission(DPOAE). Classification of hearing loss is according to the 2022 American College of Medical Genetics and Genomics(ACMG) Clinical Practice Guidelines for Hearing Loss. Whole exome sequencing(WES) and deafness gene Panel testing were performed on peripheral venous blood from probands and validations were performed on their parents by Sanger sequencing. Results:All 134 patients had childhood onset, exhibiting bilateral symmetrical slight-to-moderate sensorineural hearing loss, as indicated by audiological examinations. Of the 134 patients, 29(21.6%) had a family history of hearing loss, and the rest were sporadic patients. Genetic causative genes were identified in 66(49.3%) patients. A total of 11 causative genes were detected, of which GJB2 was causative in 34 cases(51.5%), STRC in 10 cases(15.1%), MPZL2 gene in six cases(9.1%), and USH2A in five cases(7.6%).The most common gene detected in slight-to-moderate hearing loss was GJB2, with c. 109G>A homozygous mutation found in 16 cases(47.1%) and c. 109G>A compound heterozygous mutation in 9 cases(26.5%). Conclusion:This study provides a crucial genetic theory reference for early screening and detection of mild to moderate hearing loss in children, highlighting the predominance of recessive inheritance and the significance of gene like GJB2, STRC, MPZL2, USH2A.
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Affiliation(s)
- 睿 周
- 中国人民解放军总医院第六医学中心耳鼻咽喉头颈外科医学部耳鼻咽喉内科解放军医学院(北京,100853)Department of Audiology and Vestibular Medicine, College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital; Chinese PLA Medical School, Beijing, 100853, China
- 国家耳鼻咽喉疾病临床医学研究中心National Clinical Research Center for Otolaryngologic Diseases
| | - 静 关
- 中国人民解放军总医院第六医学中心耳鼻咽喉头颈外科医学部耳鼻咽喉内科解放军医学院(北京,100853)Department of Audiology and Vestibular Medicine, College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital; Chinese PLA Medical School, Beijing, 100853, China
- 国家耳鼻咽喉疾病临床医学研究中心National Clinical Research Center for Otolaryngologic Diseases
| | - 秋菊 王
- 中国人民解放军总医院第六医学中心耳鼻咽喉头颈外科医学部耳鼻咽喉内科解放军医学院(北京,100853)Department of Audiology and Vestibular Medicine, College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital; Chinese PLA Medical School, Beijing, 100853, China
- 国家耳鼻咽喉疾病临床医学研究中心National Clinical Research Center for Otolaryngologic Diseases
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Zhao M, Luo X, Zhao Q, Yang T, Zhang W, Chen Z, Zeng S, Chen W, Zhang H, Wang Q, Wang W, Zhang X, Zhong T. Characteristics of hearing loss-associated gene mutations: A multi-center study of 119,606 neonates in Gannan. Int J Pediatr Otorhinolaryngol 2023; 174:111744. [PMID: 37801830 DOI: 10.1016/j.ijporl.2023.111744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 09/23/2023] [Accepted: 09/25/2023] [Indexed: 10/08/2023]
Abstract
BACKGROUND HL is the second most common congenital disability in China, and its high incidence brings a serious burden of medical and educational sequelae. HL genetic screening enables the identification of individuals with inherited HL and carriers in a large scale. OBJECTIVE This study aimed to measure the detection rates of hearing loss (HL)-associated gene mutations in the Gannan population. The molecular etiology and risk factors of hereditary HL were also analyzed. METHODS In total, 119,606 newborns from 18 districts of Gannan were enrolled in this multi-center study conducted between April 2019 and April 2021. Otoacoustic Emission (OAE) was used for primary hearing screening 3 days after birth in quiet conditions, and OAE combined with automated auditory brainstem response (AABR) was applied 29-42 days after birth for those who failed or missed the initial screening. Meanwhile, high-throughput sequencing of hotspot HL-associated mutations in GJB2, GJB3, MTRNR1, and SLC26A4 were performed. RESULTS Among the 119,606 newborns, 7796 (6.52%) failed the hearing screening. Genetic screening revealed that 5092 neonates (4.26%) carried HL-associated mutations. The detection rate of GJB2, SLC26A4, MTRNR1 and GJB3 mutations were 2.09%, 1.51%, 0.42% and 0.24%, respectively. The most prevalent variant was GJB2 c.235delC (1.74%). The second most prevalent variant was SLC26A4 c.919-2A > G (0.93%). The population who failed the hearing screening had a lower proportion (24.64%) of SLC26A4 gene variants compared to the population who passed (37.46%). Genetic screening identified 4612 (3.86%) carriers who were normal in hearing screenings. The concurrent hearing and genetic screening identified 480 (0.40%) neonates at high risk for hereditary HL. CONCLUSIONS The results of this study suggest that the concurrent hearing screening and high-throughput genetic screening would greatly improve the effectiveness of newborn HL programs. This integration also facilitates the management of congenital HL, and aids in the prevention of aminoglycoside antibiotics-induced HL.
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Affiliation(s)
- Minghong Zhao
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China; Laboratory Medicine, Guizhou Aerospace Hospital, Zunyi, China
| | - Xuemei Luo
- Ganzhou Municipal Health Commission, Ganzhou, China
| | - Qinfei Zhao
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Tong Yang
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Wenqian Zhang
- BGI Genomics, Shenzhen, China; Clin Lab, BGI Genomics, Wuhan, China
| | - Zhigang Chen
- BGI Genomics, Shenzhen, China; Clin Lab, BGI Genomics, Wuhan, China
| | - Shaoying Zeng
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Weifeng Chen
- Department of Otorhinolaryngology Head and Neck Surgery, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Huijuan Zhang
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Qi Wang
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China
| | - Weihua Wang
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Xiaokang Zhang
- School of Public Health and Health Management, Gannan Medical University, Ganzhou, China.
| | - Tianyu Zhong
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China.
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Yuan L, Wang X, Liu X, Chen S, Kong W, He M, Sun Y. Genotypic and Allelic Frequencies of GJB2 Variants and Features of Hearing Phenotypes in the Chinese Population of the Dongfeng-Tongji Cohort. Genes (Basel) 2023; 14:2007. [PMID: 38002950 PMCID: PMC10670965 DOI: 10.3390/genes14112007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/22/2023] [Accepted: 10/24/2023] [Indexed: 11/26/2023] Open
Abstract
BACKGROUND This study aimed to describe the distribution of the genotype and allele frequencies of GJB2 variants in the Chinese population of the Dongfeng Tongji cohort and to analyze the features of the hearing phenotype. METHODS We used data from 9910 participants in the Dongfeng Tongji cohort in 2013 and selected nine GJB2 variants. Pure tone audiometry was employed to measure hearing. Differences in genotype and allele frequencies were analyzed via chi-squared test or Fisher's exact test. RESULTS Of the 9910 participants, 5742 had hearing loss. The genotype frequency of the GJB2 variant c.109G>A was statistically significantly distributed between the normal and impaired hearing groups, but not for the variant c.235delC. A higher frequency of the c.109G>A homozygous genotype was found in the hearing loss group (0.5%) than in the normal hearing group (0.1%). Patients with c.109G>A and c.235delC homozygous mutations exhibited varying degrees of hearing loss, mainly presenting sloping and flat audiogram shapes. CONCLUSIONS A significant difference was found in the genotype frequency of the GJB2 variant c.109G>A between the case and control groups, but not in that of the variant c.235delC. Different degrees of hearing loss and various audiogram shapes were observed in patients with c.109G>A and c.235delC homozygous mutations.
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Affiliation(s)
- Lanlai Yuan
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; (L.Y.); (X.W.); (X.L.); (S.C.); (W.K.)
| | - Xiaohui Wang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; (L.Y.); (X.W.); (X.L.); (S.C.); (W.K.)
| | - Xiaozhou Liu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; (L.Y.); (X.W.); (X.L.); (S.C.); (W.K.)
| | - Sen Chen
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; (L.Y.); (X.W.); (X.L.); (S.C.); (W.K.)
| | - Weijia Kong
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; (L.Y.); (X.W.); (X.L.); (S.C.); (W.K.)
- Institute of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Meian He
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yu Sun
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; (L.Y.); (X.W.); (X.L.); (S.C.); (W.K.)
- Institute of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
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Zeng B, Xu H, Yu Y, Li S, Tian Y, Li T, Yang Z, Wang H, Wang G, Chang M, Tang W. Increased diagnostic yield in a cohort of hearing loss families using a comprehensive stepwise strategy of molecular testing. Front Genet 2022; 13:1057293. [PMID: 36568381 PMCID: PMC9768221 DOI: 10.3389/fgene.2022.1057293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 11/14/2022] [Indexed: 12/12/2022] Open
Abstract
Hearing loss is one of the most common sensory disorders in humans. This study proposes a stepwise strategy of deafness gene detection using multiplex PCR combined with high-throughput sequencing, Sanger sequencing, multiplex ligation-dependent probe amplification (MLPA), and whole-exome sequencing (WES) to explore its application in molecular diagnosis of hearing loss families. A total of 152 families with hearing loss were included in this study, the highest overall diagnosis rate was 73% (111/152). The diagnosis rate of multiplex PCR combined with high-throughput sequencing was 52.6% (80/152). One families was diagnosed by Sanger sequencing of GJB2 exon 1. Two families were diagnosed by MLPA analysis of the STRC gene. The diagnosis rate with additional contribution from WES was 18.4% (28/152). We identified 21 novel variants from 15 deafness genes by WES. Combining WES and deep clinical phenotyping, we diagnosed 11 patients with syndromic hearing loss (SHL). This study demonstrated improved diagnostic yield in a cohort of hearing loss families and confirmed the advantages of a stepwise strategy in the molecular diagnosis of hearing loss.
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Affiliation(s)
- Beiping Zeng
- BGI College and Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China,National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Henan Institute of Reproduction Health Science and Technology, Zhengzhou, China
| | - Hongen Xu
- Precision Medicine Center, Academy of Medical Science, Zhengzhou University, Zhengzhou, China,The Research and Application Center of Precision Medicine, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yanan Yu
- Precision Medicine Center, Academy of Medical Science, Zhengzhou University, Zhengzhou, China
| | - Siqi Li
- Department of Physiology and Neurobiology, Academy of Medical Science, Zhengzhou University, Zhengzhou, China
| | - Yongan Tian
- Precision Medicine Center, Academy of Medical Science, Zhengzhou University, Zhengzhou, China
| | - Tiandong Li
- College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Zengguang Yang
- Precision Medicine Center, Academy of Medical Science, Zhengzhou University, Zhengzhou, China
| | - Haili Wang
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Henan Institute of Reproduction Health Science and Technology, Zhengzhou, China
| | - Guangke Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Henan Provincial People’s Hospital, Zhengzhou, China
| | - Mingxiu Chang
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Henan Institute of Reproduction Health Science and Technology, Zhengzhou, China,*Correspondence: Mingxiu Chang, ; Wenxue Tang,
| | - Wenxue Tang
- The Research and Application Center of Precision Medicine, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China,*Correspondence: Mingxiu Chang, ; Wenxue Tang,
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Stepanova AA, Ismagilova OR, Galeeva NM, Markova TG, Tavartkiladze GA, Kvlividze O, Polyakov AV. Molecular Genetic Study of the Causes of Nonsyndromic Sensorineural Hearing Loss in Patients from Georgia. RUSS J GENET+ 2022. [DOI: 10.1134/s1022795422050106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Genetic profiles of non-syndromic severe-profound hearing loss in Chinese Hans by whole-exome sequencing. Gene 2022; 819:146258. [PMID: 35114279 DOI: 10.1016/j.gene.2022.146258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 01/07/2022] [Accepted: 01/27/2022] [Indexed: 11/20/2022]
Abstract
Hereditary hearing loss is highly heterogeneous. Despite over 120 non-syndromic deafness genes have been identified, there are still some of novel genes and variants being explored. In the study, we investigated 105 Chinese Han children with non-syndromic, prelingual, severe-profound hearing loss by whole-exome sequencing on DNA samples. The most common deafness gene was GJB2, mainly in variant c.235delC (p.Leu79CysfsTer3). 14 children were identified with pathogenic mutations in three genes, GJB2, SLC26A4, and OTOF. Two mutations have been identified to be pathogenic and not recorded previously, including c.4691G > A (p.Trp1564Ter) and c.3928_3930dup (p.Lys1310dup) in OTOF. The rare variants c.1349G > A (p.Arg450His) and c.456 T > G (p.Asn152Lys) in GSDME, and c.1595G > T (p.Ser532Ile) in SLC26A4 were detected. The frequency of nonsense variant c.2359G > T (p.Glu787Ter) in OTOA was very high in 17 cases. Four of them were identified to be digenic inheritance, including GJB2 and COL4A4, GJB2 and EYA1, GJB2 and COL4A5, and GJB2 and DFNA5. The findings showed that a novel pathogenic variant and rare variants may be associated with severe and profound hearing loss.
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Abstract
Hearing loss is one of the most common congenital defects in infancy; it increases speech and language delays and adversely affects academic achievement and socialemotional development. The risk of hearing loss in premature infants is higher than that in normal newborns, and because of the fragility of the auditory nervous system, it is more vulnerable to different risk factors. The hearing screening guidelines in current use were proposed by the American Academy of Pediatrics and updated in 2007, but there are no uniform guidelines for hearing screening in preterm infants. This review focuses on the risk factors related to hearing loss in premature infants, hearing screening strategies, and reasons for failure. The aim is to provide a more comprehensive understanding of hearing development in preterm infants to achieve early detection and early intervention. At the same time, attention should be paid to delayed auditory maturation in preterm infants to avoid excessive intervention. KEY POINTS: · Hearing loss is very common in infancy, especially in premature infants.. · Genetic factors, infection, hyperbilirubinemia, drugs, and noise are the main causes.. · We should pay attention to the delayed hearing maturity of premature infants and avoid excessive intervention..
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Affiliation(s)
- Xiaodan Zhu
- Division of Neonatology, Department of Pediatrics, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China.,Department of Perinatology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China.,Sichuan Clinical Research Center for Birth Defects, Luzhou, Sichuan, China
| | - Xiaoping Lei
- Division of Neonatology, Department of Pediatrics, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China.,Department of Perinatology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China.,Sichuan Clinical Research Center for Birth Defects, Luzhou, Sichuan, China
| | - Wenbin Dong
- Division of Neonatology, Department of Pediatrics, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China.,Department of Perinatology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China.,Sichuan Clinical Research Center for Birth Defects, Luzhou, Sichuan, China
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Wu T, Cui L, Mou Y, Guo W, Liu D, Qiu J, Xu C, Zhou J, Han F, Sun Y. A newly identified mutation (c.2029 C > T) in SLC26A4 gene is associated with enlarged vestibular aqueducts in a Chinese family. BMC Med Genomics 2022; 15:49. [PMID: 35249537 PMCID: PMC8898487 DOI: 10.1186/s12920-022-01200-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Accepted: 02/28/2022] [Indexed: 11/29/2022] Open
Abstract
Background The enlarged vestibular aqueduct (EVA), associated with mutations in the SLC26A4 gene, characterized by non-syndromic hearing loss, is an autosomal recessive disorder. Here, we intended to investigate genetic causes of hearing loss in a Han Chinese man. Method First, whole-exome sequencing was performed to identify the gene mutations responsible for hearing loss in the proband. Sanger sequencing was used to verify the candidate mutations detected in the family. Next, we collected blood samples and clinical data from the three-generation pedigree. Finally, SLC26A4 mRNA and protein expression levels were detected by qPCR and western blotting. Result The proband suffered from bilateral progressive sensorineural hearing loss with EVA. The sequence analysis of SLC26A4 revealed that the proband and his sister both harbored a compound heterozygous mutation of c.2168A > G/c.2029C > T, inherited from their father and mother respectively. c.2029C > T mutation has not been recorded in the relevant literature previously. Relative mRNA levels of the SLC26A4 gene in individuals carrying a compound heterozygous mutation were significantly lower compared to a heterozygous mutation. SLC26A4 protein levels of 293t cells which transfected with recombinant plasmids [GV219-SLC26A4-mut (c.2029C > T) and GV219-SLC26A4-mut (c.2168A > G/c.2029C > T)] were significantly lower than normal control recombinant plasmids (GV219-SLC26A4-wt). Conclusion This study found a novel heterozygous mutation c.2029 (exon17) C > T compound with c.2168 (exon19) A > G in the SLC26A4 gene in a patient with EVA. The c.2029 (exon17) C > T mutation is proved to be pathogenic. This finding broadens the spectrum of variants in SLC26A4 gene. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-022-01200-4.
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11
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Hegde S, Hegde R, Kulkarni SS, Das KK, Gai PB, Bulagouda RS. Analysis of Genetic Variations in Connexin 26 (GJB2) Gene among Nonsyndromic Hearing Impairment: Familial Study. Glob Med Genet 2022; 9:152-158. [PMID: 35707775 PMCID: PMC9192169 DOI: 10.1055/s-0042-1743257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 12/29/2021] [Indexed: 11/24/2022] Open
Abstract
Objective
The goal of this research was to investigate the gap junction beta 2 (
GJB2
) gene mutations associated with nonsyndromic hearing loss individuals in North Karnataka, India.
Materials and Methods
For this study, patients with sensorineural genetic hearing abnormalities and a family history of deafness were included. A total of 35 patients from 20 families have been included in the study. The patient's DNA was isolated from peripheral blood samples. The
GJB2
gene coding region was analyzed through Sanger sequencing.
Results
There is no changes in the first exon of the
GJB2
gene. Nine different variants were recorded in second exon of the targeted gene. W24X and W77X are two nonsense mutations and three polymorphisms viz. R127H, V153I, and I33T were reported along with four 3′-UTR variants. A total (9/20) of 45% of families have been identified with mutations in the targeted gene.
Conclusion
GJB2
mutations were identified in 19 deaf-mute patients (19/35), and 13 patients were homozygous for the mutations identified in our study cohort. In our study, W24X mutation was found to be the pathogenic with a high percentage, prompting further evaluation of the other genes, along with the study of additional genetic or external causes in the families, which is essential.
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Affiliation(s)
- Smita Hegde
- Human Genetics Laboratory, Department of Anatomy, Shri B.M. Patil Medical College, Hospital and Research Centre, BLDE University (Deemed to be University), Vijayapura, Karnataka, India
- Division of Human Genetics, Karnataka Institute for DNA Research, Dharwad, Karnataka, India
| | - Rajat Hegde
- Division of Human Genetics, Karnataka Institute for DNA Research, Dharwad, Karnataka, India
- Laboratory of Vascular Physiology and Medicine, Department of Physiology, Shri B.M. Patil Medical College, Hospital and Research Centre, BLDE University (Deemed to be University), Vijayapura, Karnataka, India
| | - Suyamindra S. Kulkarni
- Division of Human Genetics, Karnataka Institute for DNA Research, Dharwad, Karnataka, India
| | - Kusal K. Das
- Laboratory of Vascular Physiology and Medicine, Department of Physiology, Shri B.M. Patil Medical College, Hospital and Research Centre, BLDE University (Deemed to be University), Vijayapura, Karnataka, India
| | - Pramod B. Gai
- Division of Human Genetics, Karnataka Institute for DNA Research, Dharwad, Karnataka, India
| | - Rudragouda S. Bulagouda
- Human Genetics Laboratory, Department of Anatomy, Shri B.M. Patil Medical College, Hospital and Research Centre, BLDE University (Deemed to be University), Vijayapura, Karnataka, India
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12
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Li N, Zhang Y, Shen M, Xu Y. A fully integrated SNP genotyping system for hereditary hearing-loss detection. LAB ON A CHIP 2022; 22:697-708. [PMID: 34923580 DOI: 10.1039/d1lc00805f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Hereditary hearing loss is one of the most common human neurosensory disorders, and there is a great need for early intervention methods such as genetically screening newborns. Single nucleotide polymorphisms (SNPs) are the major genetic targets for hearing-loss screening. In this study, a fully integrated SNP genotyping system was constructed to identify hereditary hearing loss-related genetic markers from human whole blood. The entire detection process, including blood cell lysis, nucleic acid extraction, the reaction mixture distribution, the chambers sealing and the two-colour multiplex competitive allele-specific polymerase chain reaction (KASP), can be automatically conducted in a self-contained cassette within 3 hours. To critically evaluate the performance of the system, its specificity, sensitivity and stability were assessed. Then, 13 clinical samples were genotyped with this fluidic cassette system to detect seven hotspot deafness-associated mutations in three genes (MT-RNR1, GJB2 and SLC26A4). The detection results of the cassette system were 100% concordant with those obtained by Sanger sequencing, proving its accuracy in the genetic screening of inherited hearing loss.
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Affiliation(s)
- Nan Li
- State Key Laboratory of Membrane Biology, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China.
| | - Yuanyue Zhang
- State Key Laboratory of Membrane Biology, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China.
| | - Minjie Shen
- State Key Laboratory of Membrane Biology, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China.
| | - Youchun Xu
- State Key Laboratory of Membrane Biology, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China.
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13
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Arias S, Paradisi I, Hernández A, Kanzler D. Undescribed GJB2 c.35dupG homozygous prelingual distinguished from c.35delG homozygous/compound heterozygous deafs, dwelling a German ancestry Venezuelan isolate. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2021. [DOI: 10.1186/s43042-021-00159-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Among ten hearing-impaired (HI) families mostly of German descent dwelling the Venezuelan isolate Colonia Tovar, which were initially studied several decades ago to assess the etiology of their profound/prelingual nonsyndromic deafness phenotype, an undescribed genotype/phenotype was found. Forty-eight subjects, including 8 of the still living 143 originally searched with audiograms 4 decades ago, were retested and their DNA collected. A genomic search of 27 loci involved in HI was performed on a randomly chosen prelingual deaf patient. Subsequently, GJB2 sequencing was performed in all subjects from each pedigree. Haplotypes were constructed with five intragenic GJB2 SNPs (rs117685390, rs7994748, rs2274084, rs2274083, and rs3751385). Audiograms performed along 5 decades were compared to evaluate age-related hearing loss in the different genotypes found in the population.
Results
Three prelingual deaf siblings, having the highest recorded symmetrical hearing loss of all the known affected in the isolate, carried the very rare mutation c.35dupG (p.V13Cfs*35) at GJB2 in a homozygous condition. Two additional GJB2 mutations were identified (p.W77R and c.35delG) in the isolate. Allelic disequilibrium in both c.35dupG and p.W77R carriers (with in-phase haplotype T;T;G;A;C) were found, although not so in the 2 other found c.35delG independent haplotypes. A compound heterozygote in trans (c.35delG/c.35dupG) was audiometrically distinguishable from both the c.35dupG and c.35delG homozygotes.
Conclusions
A relatively higher frequency of mutation of c.35dupG found than elsewhere was retrospectively inferred for the ancient population of the Kaiserstuhl region in Germany, having an opposite epidemiological situation to the one found with the contiguous and very frequent c.35delG. Haplotype analysis suggests founder phenomena and independent occurrence, hundreds of generations back in Caucasoid populations for both mutations.
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14
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Lin YH, Wu PC, Tsai CY, Lin YH, Lo MY, Hsu SJ, Lin PH, Erdenechuluun J, Wu HP, Hsu CJ, Wu CC, Chen PL. Hearing Impairment with Monoallelic GJB2 Variants: A GJB2 Cause or Non-GJB2 Cause? J Mol Diagn 2021; 23:1279-1291. [PMID: 34325055 DOI: 10.1016/j.jmoldx.2021.07.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 03/23/2021] [Accepted: 07/07/2021] [Indexed: 12/26/2022] Open
Abstract
Recessive variants in GJB2 are the most common genetic cause of sensorineural hearing impairment. However, in many patients, only one variant in the GJB2 coding region is identified using conventional sequencing strategy (eg, Sanger sequencing), resulting in nonconfirmative diagnosis. Conceivably, there might be other unidentified pathogenic variants in the noncoding region of GJB2 or other deafness-causing genes in these patients. To address this, a next-generation sequencing-based diagnostic panel targeting the entire GJB2 gene and the coding regions of 158 other known deafness-causing genes was designed and applied to 95 patients with nonsyndromic sensorineural hearing impairment (including 81 Han Taiwanese and 14 Mongolian patients) in whom only a single GJB2 variant had been detected using conventional Sanger sequencing. The panel confirmed the genetic diagnosis in 24 patients (25.3%). Twenty-two of them had causative variants in several deafness-causing genes other than GJB2, including MYO15A, MYO7A, TECTA, POU4F3, KCNQ4, SLC26A4, OTOF, MT-RNR1, MITF, WFS1, and USH2A. The other two patients had causative variants in GJB2, including a Taiwanese patient with a mosaic maternal uniparental disomy c.235delC variant (approximately 69% mosaicism) and a Mongolian patient with compound heterozygous c.35dupG and c.35delG variants, which occurred at the same site. This study demonstrates the utility of next-generation sequencing in clarifying the genetic diagnosis of hearing-impaired patients with nonconfirmative GJB2 genotypes on conventional genetic examinations.
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Affiliation(s)
- Yi-Hsin Lin
- Department of Otolaryngology, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan; Institute of Molecular Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Ping-Che Wu
- College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Cheng-Yu Tsai
- Department of Otolaryngology, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan; Graduate Institutes of Medical Genomic, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Yin-Hung Lin
- Department of Otolaryngology, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan; Graduate Institutes of Medical Genomic, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Ming-Yu Lo
- Department of Otolaryngology, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan; Institute of Molecular Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Shu-Jui Hsu
- Graduate Institutes of Medical Genomic, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Pei-Hsuan Lin
- Department of Otolaryngology, National Taiwan University Hospital Yunlin Branch, Yunlin, Taiwan
| | - Jargalkhuu Erdenechuluun
- Department of Otolaryngology, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia; The EMJJ Otolaryngology Hospital, Ulaanbaatar, Mongolia
| | - Hung-Pin Wu
- Department of Otolaryngology Head and Neck Surgery, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan; School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Chuan-Jen Hsu
- Department of Otolaryngology, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan; Department of Otolaryngology Head and Neck Surgery, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Chen-Chi Wu
- Department of Otolaryngology, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan; Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan.
| | - Pei-Lung Chen
- Institute of Molecular Medicine, National Taiwan University College of Medicine, Taipei, Taiwan; Graduate Institutes of Medical Genomic, National Taiwan University College of Medicine, Taipei, Taiwan; Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan; Department of Medical Genetics, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan; Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University Hospital, Taipei, Taiwan.
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15
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Safka Brozkova D, Uhrova Meszarosova A, Lassuthova P, Varga L, Staněk D, Borecká S, Laštůvková J, Čejnová V, Rašková D, Lhota F, Gašperíková D, Seeman P. The Cause of Hereditary Hearing Loss in GJB2 Heterozygotes-A Comprehensive Study of the GJB2/DFNB1 Region. Genes (Basel) 2021; 12:genes12050684. [PMID: 34062854 PMCID: PMC8147375 DOI: 10.3390/genes12050684] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/27/2021] [Accepted: 04/28/2021] [Indexed: 12/14/2022] Open
Abstract
Hearing loss is a genetically heterogeneous sensory defect, and the frequent causes are biallelic pathogenic variants in the GJB2 gene. However, patients carrying only one heterozygous pathogenic (monoallelic) GJB2 variant represent a long-lasting diagnostic problem. Interestingly, previous results showed that individuals with a heterozygous pathogenic GJB2 variant are two times more prevalent among those with hearing loss compared to normal-hearing individuals. This excess among patients led us to hypothesize that there could be another pathogenic variant in the GJB2 region/DFNB1 locus. A hitherto undiscovered variant could, in part, explain the cause of hearing loss in patients and would mean reclassifying them as patients with GJB2 biallelic pathogenic variants. In order to detect an unknown causal variant, we examined 28 patients using NGS with probes that continuously cover the 0.4 Mb in the DFNB1 region. An additional 49 patients were examined by WES to uncover only carriers. We did not reveal a second pathogenic variant in the DFNB1 region. However, in 19% of the WES-examined patients, the cause of hearing loss was found to be in genes other than the GJB2. We present evidence to show that a substantial number of patients are carriers of the GJB2 pathogenic variant, albeit only by chance.
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Affiliation(s)
- Dana Safka Brozkova
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
- Correspondence:
| | - Anna Uhrova Meszarosova
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
| | - Petra Lassuthova
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
| | - Lukáš Varga
- Department of Otorhinolaryngology–Head and Neck Surgery, Faculty of Medicine and University Hospital, Comenius University, 85107 Bratislava, Slovakia;
- Diabgene Laboratory, Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, 84505 Bratislava, Slovakia; (S.B.); (D.G.)
| | - David Staněk
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
| | - Silvia Borecká
- Diabgene Laboratory, Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, 84505 Bratislava, Slovakia; (S.B.); (D.G.)
| | - Jana Laštůvková
- Department of Medical Genetics, Masaryk Hospital in Usti nad Labem, Regional Health Corporation, 40011 Ústí nad Labem, Czech Republic; (J.L.); (V.Č.)
| | - Vlasta Čejnová
- Department of Medical Genetics, Masaryk Hospital in Usti nad Labem, Regional Health Corporation, 40011 Ústí nad Labem, Czech Republic; (J.L.); (V.Č.)
| | - Dagmar Rašková
- Centre for Medical Genetics and Reproductive Medicine GENNET, 17000 Prague, Czech Republic; (D.R.); (F.L.)
| | - Filip Lhota
- Centre for Medical Genetics and Reproductive Medicine GENNET, 17000 Prague, Czech Republic; (D.R.); (F.L.)
| | - Daniela Gašperíková
- Diabgene Laboratory, Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, 84505 Bratislava, Slovakia; (S.B.); (D.G.)
| | - Pavel Seeman
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
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16
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Hegde S, Hegde R, Kulkarni SS, Das KK, Gai PB, Bulgouda R. Molecular alteration in the Gap Junction Beta 2 ( GJB2) gene associated with non-syndromic sensorineural hearing impairment. Intractable Rare Dis Res 2021; 10:31-36. [PMID: 33614373 PMCID: PMC7882085 DOI: 10.5582/irdr.2020.03157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Non-syndromic sensory neural hearing defect is one of the genetic diseases inherited from parents to offerings. The autosomal recessive form affects a large population worldwide and has become a major concern in the social and professional lives of many people. There are many factors and genes which are involved in hearing loss but the Gap Junction Beta 2 (GJB2) gene which encodes the connexin 26 protein, is a major cause of non-syndromic recessive deafness (NSRD). This study aims to record and analyze GJB2 gene mutations in the hearing-impaired population of North Karnataka, India. In this study, we included 368 congenitally hearing-impaired children from North Karnataka, India, under 18 years of age. After thorough clinical examinations, patient's history and proper audiological results, peripheral blood samples were collected and subjected to genetic analysis. We recorded that 54.8% of the NSRD cases have an autosomal recessive mutation in the coding region of the GJB2 gene. The frequency of W24X (25%) mutation was found to be high in the present study population. From this study we can suggest that, identifying this mutation in new-borns definitely helps in the early diagnosis of hearing loss.
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Affiliation(s)
- Smita Hegde
- Human genetics laboratory, Department of Anatomy, Shri B. M. Patil Medical College, Hospital and Research centre, BLDE (Deemed to be University), Vijayapura, India
- Karnataka Institute for DNA Research (KIDNAR), Dharwad, India
| | - Rajat Hegde
- Laboratory vascular physiology and medicine, Department of Physiology, Shri B. M. Patil Medical College, Hospital and Research centre, BLDE (Deemed to be University), Vijayapura, India
- Karnataka Institute for DNA Research (KIDNAR), Dharwad, India
| | | | - Kusal K Das
- Laboratory vascular physiology and medicine, Department of Physiology, Shri B. M. Patil Medical College, Hospital and Research centre, BLDE (Deemed to be University), Vijayapura, India
| | - Pramod B Gai
- Karnataka Institute for DNA Research (KIDNAR), Dharwad, India
- Address correspondence to:Pramod B Gai, Karnataka Institute for DNA Research Dharwad 580003, India. E-mail:
| | - Rudregouda Bulgouda
- Human genetics laboratory, Department of Anatomy, Shri B. M. Patil Medical College, Hospital and Research centre, BLDE (Deemed to be University), Vijayapura, India
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17
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Yang X, Liu N, Mu H, Lv Y, Zhang H, Li Y, Guan J, Gai Z, Liu Y. Reprogramming of human peripheral blood mononuclear cell (PBMC) from a patient suffering from hearing loss into iPSC line (SDQLCHi035-A) maintaining compound heterozygous variations in GJB2 gene. Stem Cell Res 2021; 51:102188. [PMID: 33517119 DOI: 10.1016/j.scr.2021.102188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/30/2020] [Accepted: 01/16/2021] [Indexed: 10/22/2022] Open
Abstract
Mutation in the gap junction beta-2 (GJB2) gene is a main cause of autosomal-recessive nonsyndromic hearing loss (ARNSHL). The c.235delC and c.299-300del mutations are more common mutations in Chinese Han deaf patients, in which the compound heterozygous mutations of these two sites cause severe-to-profound hearing loss in a significant percentage. We established an induced pluripotent stem cell (iPSC) line from a 2-year-old boy with hearing loss, caused by compound heterozygous mutations in GJB2 (c.235delC and c.299-300del). The iPSCs was verified based on pluripotency markers and demonstrated trilineage differentiation potential in vitro.
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Affiliation(s)
- Xiaomeng Yang
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Ning Liu
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Hong Mu
- Otolaryngology Department, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Yuqiang Lv
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Haiyan Zhang
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Yue Li
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Jingyun Guan
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Zhongtao Gai
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
| | - Yi Liu
- Pediatric Research Institute, Qilu Children's Hospital of Shandong University, Jinan, Shandong 250022, China
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18
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Zhou K, Huang L, Feng M, Li X, Zhao Y, Liu F, Wei J, Qin D, Lu Q, Shi M, Qu S, Tang F. A novel SLC26A4 splicing mutation identified in two deaf Chinese twin sisters with enlarged vestibular aqueducts. Mol Genet Genomic Med 2020; 8:e1447. [PMID: 32770655 PMCID: PMC7549568 DOI: 10.1002/mgg3.1447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/15/2020] [Accepted: 07/16/2020] [Indexed: 12/13/2022] Open
Abstract
Background Variants in the SLC26A4 gene are correlated with nonsyndromic hearing loss with an enlarged vestibular aqueduct (EVA). This study aimed to identify the genetic causes in a Chinese family with EVA, and the pathogenicity of the detected variants. Methods We collected blood samples and clinical data from a pair of deaf twin sisters with EVA and their family members. As controls, a group of 500 normal‐hearing people were enrolled in our study. Twenty‐one exons and flanking splice sites of the SLC26A4 gene were screened for pathogenic mutations by polymerase chain reaction and bidirectional Sanger sequencing. Minigene assays were used to verify whether the novel SLC26A4 intronic mutation influenced the normal splicing of mRNA. Results Hearing loss in the twins with EVA was diagnosed using auditory tests and imaging examinations. Two pathogenic mutations, c.919‐2A>G and c.1614+5G>A were detected in SLC26A4, the latter of which has not been reported in the literature. The minigene expression in vitro confirmed that c.1614+5G>A could cause aberrant splicing, resulting in skipping over exon 14. Conclusions On the SLC26A4 gene, c.1614+5G>A is a pathogenic mutation. This finding enriches the mutational spectrum of the SLC26A4 gene and provides a basis for the genetic diagnosis of EVA.
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Affiliation(s)
- Kai Zhou
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China.,Guangxi Medical University, Nanning, Guangxi, China
| | - Lancheng Huang
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China.,Guangxi Medical University, Nanning, Guangxi, China
| | - Menglong Feng
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China.,Guangxi University of Chinese Medicine, Nanning, Guangxi, China
| | - Xinlei Li
- Medical Genetics Center, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Yi Zhao
- Medical Genetics Center, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Fei Liu
- Research Center of Medical Sciences, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Jiazhang Wei
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Danxue Qin
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Qiutian Lu
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Min Shi
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Shenhong Qu
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Fengzhu Tang
- Department of Otolaryngology & Head and Neck, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
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19
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Hearing Phenotypes of Patients with Hearing Loss Homozygous for the GJB2 c.235delc Mutation. Neural Plast 2020; 2020:8841522. [PMID: 32802038 PMCID: PMC7416285 DOI: 10.1155/2020/8841522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 06/18/2020] [Accepted: 06/30/2020] [Indexed: 01/17/2023] Open
Abstract
Hereditary hearing loss is characterized by remarkable phenotypic heterogeneity. Patients with the same pathogenic mutations may exhibit various hearing loss phenotypes. In the Chinese population, the c.235delC mutation is the most common pathogenic mutation of GJB2 and is closely related to hereditary recessive hearing loss. Here, we investigated the hearing phenotypes of patients with hearing loss associated with the homozygous c.235delC mutation, paying special attention to asymmetric interaural hearing loss. A total of 244 patients with the GJB2 c.235delC homozygous mutation encountered from 2007 to 2015 were enrolled. The severity of hearing loss was scaled with the American Speech-Language-Hearing Association (ASHA). Auditory phenotypes were analyzed, and three types of interaural asymmetry were defined based on audiograms: Type A (asymmetry of hearing loss severity), Type B (asymmetry of audiogram shape), and Type C (Type A plus Type B). Of the 488 ears (244 cases) examined, 71.93% (351) presented with profound hearing loss, 14.34% (70) with severe hearing loss, and 9.43% (46) with moderate to severe hearing loss. The most common audiogram shapes were descending (31.15%) and flat (24.18%). A total of 156 (63.93%) of the 244 patients exhibited asymmetric interaural hearing loss in terms of severity and/or audiogram shape. Type A was evident in 14 of these cases, Type B in 106, and Type C in 36. In addition, 211 of 312 ears (67.63%) in the interaural hearing asymmetry group showed profound hearing loss, and 59 (18.91%) exhibited severe hearing loss, with the most common audiogram shapes being flat (27.88%) and descending (22.12%). By contrast, in the interaural hearing symmetry group, profound hearing loss was observed in 140 ears (79.55%), and the most common audiograms were descending (46.59%) and residual (21.59%). Hearing loss associated with the GJB2 c.235delC homozygous mutation shows diverse phenotypes, and a considerable proportion of patients show bilateral hearing loss asymmetry.
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Compound Heterozygous Mutations in TMC1 and MYO15A Are Associated with Autosomal Recessive Nonsyndromic Hearing Loss in Two Chinese Han Families. Neural Plast 2020; 2020:8872185. [PMID: 32802042 PMCID: PMC7416276 DOI: 10.1155/2020/8872185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/12/2020] [Accepted: 07/06/2020] [Indexed: 12/19/2022] Open
Abstract
Genetic hearing loss is a common sensory disorder, and its cause is highly heterogeneous. In this study, by targeted next-generation sequencing of 414 known deafness genes, we identified compound heterozygous mutations p.R34X/p.M413T in TMC1 and p.S3417del/p.R1407T in MYO15A in two recessive Chinese Han deaf families. Intrafamilial cosegregation of the mutations with the hearing phenotype was confirmed in both families by the Sanger sequencing. Auditory features of the affected individuals are consistent with that previously reported for recessive mutations in TMC1 and MYO15A. The two novel mutations identified in this study, p.M413T in TMC1 and p.R1407T in MYO15A, are classified as likely pathogenic according to the guidelines of ACMG. Our study expanded the mutation spectrums of TMC1 and MYO15A and illustrated that genotype-phenotype correlation in combination with next-generation sequencing may improve the accuracy for genetic diagnosis of deafness.
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Targeted Next-Generation Sequencing Identified Compound Heterozygous Mutations in MYO15A as the Probable Cause of Nonsyndromic Deafness in a Chinese Han Family. Neural Plast 2020; 2020:6350479. [PMID: 32617096 PMCID: PMC7313121 DOI: 10.1155/2020/6350479] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 05/10/2020] [Accepted: 05/29/2020] [Indexed: 12/02/2022] Open
Abstract
Hearing loss is a highly heterogeneous disorder, with more than 60% of congenital cases caused by genetic factors. This study is aimed at identifying the genetic cause of congenital hearing loss in a Chinese Han family. Auditory evaluation before and after cochlear implantation and targeted next-generation sequencing of 140 deafness-related genes were performed for the deaf proband. Compound heterozygous mutations c.3658_3662del (p. E1221Wfs∗23) and c.6177+1G>T were identified in MYO15A as the only candidate pathogenic mutations cosegregated with the hearing loss in this family. These two variants were absent in 200 normal-hearing Chinese Hans and were classified as likely pathogenic and pathogenic, respectively, based on the ACMG guideline. Our study further expanded the mutation spectrum of MYO15A as the c.3658_3662del mutation is novel and confirmed that deaf patients with recessive MYO15A mutations have a good outcome for cochlear implantation.
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