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Yu Y, Li Y, Wen C, Yang F, Chen X, Yi W, Deng L, Cheng X, Yu N, Huang L. High-frequency hearing vulnerability associated with the different supporting potential of Hensen's cells: SMART-Seq2 RNA sequencing. Biosci Trends 2024:2024.01044. [PMID: 38583982 DOI: 10.5582/bst.2024.01044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Hearing loss is the third most prevalent physical condition affecting communication, well-being, and healthcare costs. Sensorineural hearing loss often occurs first in the high-frequency region (basal turn), then towards the low-frequency region (apical turn). However, the mechanism is still unclear. Supporting cells play a critical role in the maintenance of normal cochlear function. The function and supporting capacity of these cells may be different from different frequency regions. Hensen's cells are one of the unique supporting cell types characterized by lipid droplets (LDs) in the cytoplasm. Here, we investigated the morphological and gene expression differences of Hensen's cells along the cochlear axis. We observed a gradient change in the morphological characteristics of Hensen's cells along the cochlear tonotopic axis, with larger and more abundant LDs observed in apical Hensen's cells. Smart-seq2 RNA-seq revealed differentially expressed genes (DEGs) between apical and basal Hensen's cells that clustered in several pathways, including unsaturated fatty acid biosynthesis, cholesterol metabolism, and fatty acid catabolism, which are associated with different energy storage capacities and metabolic potential. These findings suggest potential differences in lipid metabolism and oxidative energy supply between apical and basal Hensen's cells, which is consistent with the morphological differences of Hensen's cells. We also found differential expression patterns of candidate genes associated with hereditary hearing loss (HHL), noise-induced hearing loss (NIHL), and age-related hearing loss (ARHL). These findings indicate functional heterogeneity of SCs along the cochlear axis, contribute to our understanding of cochlear physiology and provide molecular basis evidence for future studies of hearing loss.
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Affiliation(s)
- Yiding Yu
- Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, China
| | - Yue Li
- Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, China
| | - Cheng Wen
- Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, China
| | - Fengbo Yang
- Otolaryngology Head and Neck Surgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Xuemin Chen
- College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Wenqi Yi
- College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Lin Deng
- Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, China
| | - Xiaohua Cheng
- Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, China
| | - Ning Yu
- College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Lihui Huang
- Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Otolaryngology, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, China
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Jiang QQ, Zhu JJ, Fan SL, Hou YP, Hu XY, Shi J, Wu L, Luo Y. Establishment and application of a reverse dot blot assay for 13 mutations of hearing-loss genes in primary hospitals in China. ASIAN BIOMED 2024; 18:11-17. [PMID: 38515630 PMCID: PMC10953844 DOI: 10.2478/abm-2024-0003] [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] [Indexed: 03/23/2024]
Abstract
Background Hearing loss is a common sensorineural dysfunction with a high incidence in China. Although genetic factors are important causes of hearing loss, hearing-related gene detection has not been widely adopted in China. Objective Establishing a rapid and efficient method to simultaneously detect hotspot hearing loss gene mutations. Methods A reverse dot blot assay combined with a flow-through hybridization technique was developed for the simultaneous detection of 13 hotspot mutations of 4 hearing loss-related genes including GJB2, GJB3, SLC26A4, and the mitochondrial gene MT-RNR1. This method involved PCR amplification systems and a hybridization platform. Results The technique can detect 13 hotspot mutations of 4 hearing loss-related genes. And a total of 213 blood samples were used to evaluate the availability of this method. Discussion Our reverse dot blot assay was a simple, rapid, accurate, and cost-effective method to identify hotspot mutations of 4 hearing loss-related genes in a Chinese population.
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Affiliation(s)
- Qing-Qing Jiang
- Department of Clinical Laboratory, Changning Maternity and Infant Health Hospital, East China Normal University, Shanghai200050, China
| | - Juan-Juan Zhu
- Chaozhou Hybribio Limited Corporation, Guangdong, China
| | - Shu-Ling Fan
- Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai200072, China
| | - Ya-Ping Hou
- Department of Clinical Laboratory, Changning Maternity and Infant Health Hospital, East China Normal University, Shanghai200050, China
| | - Xie-Ying Hu
- Department of Clinical Laboratory, Changning Maternity and Infant Health Hospital, East China Normal University, Shanghai200050, China
| | - Jie Shi
- Nanjing Red Cross Blood Center, Nanjing, Jiangsu210037, China
| | - Lei Wu
- Department of Clinical Laboratory, Changning Maternity and Infant Health Hospital, East China Normal University, Shanghai200050, China
| | - Ying Luo
- Department of Clinical Laboratory, Changning Maternity and Infant Health Hospital, East China Normal University, Shanghai200050, China
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Xiong Y, Chen M, Wang H, Chen L, Huang H, Xu L. Mutation analysis of GJB2, SLC26A4, GJB3 and mtDNA12SrRNA genes in 251 non-syndromic hearing loss patients in Fujian, China. Int J Pediatr Otorhinolaryngol 2024; 176:111777. [PMID: 38029595 DOI: 10.1016/j.ijporl.2023.111777] [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: 07/25/2023] [Revised: 10/23/2023] [Accepted: 11/03/2023] [Indexed: 12/01/2023]
Abstract
OBJECTIVES The molecular etiology of non-syndromic hearing loss (NSHL) in Southeastern China (Fujian) has not been precisely identified. our study selected patients with NSHL and analyzed their causative genes, which helped to improve the accuracy of the diagnosis of hereditary hearing loss (HHL) and its treatment. METHODS 251 unrelated patients who attended the otolaryngology clinic of Fujian Maternal and Child Health Hospital with hearing loss were enrolled to our study. All patients had genetic tests and listening tests, of which 251 were diagnosed with NSHL. In addition, we used whole-exome sequencing (WES) in a patient who has a significant family history of HHL but negative for gene chip testing, as well as in his family members. RESULT Among of 251 patients, Nucleotide changes were found in 63 cases (25.09%), including 34 located in GJB2(13.5%, including 235delC and 299_300delAT), 13 located in SLC26A4(5.18%, including c.919-2G > A and 2168 A > G), 1 located in GJB3(0.4%,538C > T) and 16 located in mtDNA12SrRNA (6.37%,1555 A > G). In addition, we discuss the process of identifying novel PLS1 mutations from 251 patients. CONCLUSION Our results demonstrate the conventional deafness gene mutation in 251 NSHL patients in Fujian, China. Compared with the other area of China, we have a lower detection rate, but GJB2 235delC remains the most common mutation in Fujian. In addition, we discuss the process of discovering novel mutation locus for deafness, which provides an understanding for deafness diagnosis and genetic testing.
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Affiliation(s)
- Yikang Xiong
- The Frist Department of Clinical Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, 350122, Fujian Province, China
| | - Meihuan Chen
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China
| | - Haiwei Wang
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China
| | - Lingji Chen
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China
| | - Hailong Huang
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China.
| | - Liangpu Xu
- The Frist Department of Clinical Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, 350122, Fujian Province, China; Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China.
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Kun L, Jiexiang H, Hua L, Junlin H, Yijun R, Lixian Z, Mingqiao C. Genetic screening of 15 hearing loss variants in 77,647 neonates with clinical follow-up. Mol Genet Genomic Med 2024; 12:e2324. [PMID: 38037722 PMCID: PMC10767602 DOI: 10.1002/mgg3.2324] [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: 07/11/2023] [Revised: 11/03/2023] [Accepted: 11/10/2023] [Indexed: 12/02/2023] Open
Abstract
BACKGROUND To analyze the genotype distribution and frequency of hearing loss genes in newborn population and evaluate the clinical value of genetic screening policy in China. METHODS Genetic screening for hearing loss was offered to 84,029 neonates between March 2019 and December 2021, of whom 77,647 newborns accepted the screening program with one-year follow-up. The genotyping of 15 hot spot variants in GJB2, GJB3, SLC26A4, and MT-RNR1 was performed on microarray platform. RESULTS A total of 3.05% (2369/77,647) newborns carried at least one genetic hearing loss-associated variant, indicated for early preventive management. The carrier frequency of GJB2 gene was the highest, at 1.48% (1147/77,647), followed by SLC26A4 gene at 1.07% (831/77,647), and GJB3 gene at 0.23% (181/77,647). GJB2 c.235delC variant and SLC26A4 IVS7-2A>G variant were the most common allelic variants with allele frequency of 0.6304% (979/155,294) and 0.3992% (620/155,294), respectively. 10 children are identified as homozygous or compound heterozygous for pathogenic variants (4 in GJB2, 6 in SLC26A4), and 7 of these infants had passed the hearing screening. Following up of the genetically screened newborns revealed that genetic screening detected more hearing-impaired infants than hearing screening alone. Genetic screening helped identify the infants who had passed the initial hearing screening, and reduced time for diagnosis and intervention of hearing aid. In addition, we identified 234 newborns (0.30%, 234/77,647) susceptible to preventable aminoglycoside antibiotic ototoxicity undetectable by hearing screening. CONCLUSION We performed the largest-scale neonatal carrier screening for hearing loss genes in Southeast China. Our results indicated that genetic screening is an important complementation to conventional hearing screening. Our practice and experience may facilitate the application and development of neonatal genetic screening policy in mainland China.
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Affiliation(s)
- Lin Kun
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
- Newborn Screening CenterPutian Maternity and Child Health Care HospitalPutianChina
| | - Huang Jiexiang
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
| | - Lin Hua
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
| | - Han Junlin
- Department of PediatricsPutian Maternity and Child Health Care HospitalPutianChina
| | - Ruan Yijun
- Department of PediatricsPutian Maternity and Child Health Care HospitalPutianChina
| | - Zhang Lixian
- Newborn Screening CenterPutian Maternity and Child Health Care HospitalPutianChina
| | - Chen Mingqiao
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
- Newborn Screening CenterPutian Maternity and Child Health Care HospitalPutianChina
- Department of PediatricsPutian Maternity and Child Health Care HospitalPutianChina
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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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Tian Y, Chang A, Jing Zhao, Tian X, Zhao Z, Shi Y. Comparative analysis of allele frequencies of 15 deafness gene variants between hearing-loss and normal populations in Henan, China. Heliyon 2023; 9:e21185. [PMID: 37964827 PMCID: PMC10641134 DOI: 10.1016/j.heliyon.2023.e21185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 09/08/2023] [Accepted: 10/18/2023] [Indexed: 11/16/2023] Open
Abstract
Background Hearing loss is found in more than 5 % of cases worldwide. Hearing loss is divided into three types: Sensorineural hearing loss, Combined hearing loss and Conductive hearing loss. Among them, no less than 50 % of pediatric cases of sensorineural hearing loss are genetic. In Henan, China, there are no statistics on the allele frequency of deafness gene variants. Methods We divided 2178 subjects enrolled at the Third Affiliated Hospital of Zhengzhou College from January 2019 to March 2021 into a hearing loss group and a normal control group. We performed array and pathogenicity classification for screening the 15 deafness gene variants, calculated and compared the allele frequency of the deafness gene variants, and then compared the hearing loss diagnosis rate between the hearing loss group and the normal control group. Results We found that in the hearing loss group, the overall allele frequency of all detected variants was 16.6 %. Comparative analysis showed that the allele frequencies of GJB2 c.235delC variant, GJB3 c.538C > T variant and SLC26A4 c.919-2A > G variant were significantly higher than those of the East Asian population average in the gnomAD database. At the same time, our study confirmed that GJB3 c.538C > T variant may not be the disease-causing variant of hearing loss. Conclusions These results support genetic counseling and rational prediction of risk for deafness.
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Affiliation(s)
- Yuan Tian
- Department of Clinical Laboratory, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Aimin Chang
- Department of Clinical Laboratory, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Jing Zhao
- Department of Clinical Laboratory, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xiaofeng Tian
- Department of Clinical Laboratory, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Zhixing Zhao
- Department of Clinical Laboratory, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Ying Shi
- Screening Center, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
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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] [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.
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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
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Li Y, Ning G, Kang B, Zhu J, Wang XY, Wang Q, Cai T. A novel recessive mutation in OXR1 is identified in patient with hearing loss recapitulated by the knockdown zebrafish. Hum Mol Genet 2023; 32:764-772. [PMID: 36130215 PMCID: PMC10365843 DOI: 10.1093/hmg/ddac229] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 08/23/2022] [Accepted: 09/03/2022] [Indexed: 11/14/2022] Open
Abstract
Hereditary hearing loss is a highly genetically heterogeneous disorder. More than 150 genes have been identified to link to human non-syndromic hearing impairment. To identify genetic mutations and underlying molecular mechanisms in affected individuals and families with congenital hearing loss, we recruited a cohort of 389 affected individuals in 354 families for whole-exome sequencing analysis. In this study, we report a novel homozygous missense variant (c.233A > G, p.Lys78Arg) in the OXR1 gene, which was identified in a 4-year-old girl with sensorineural hearing loss. OXR1 encodes Oxidation Resistance 1 and is evolutionarily conserved from zebrafish to human. We found that the ortholog oxr1b gene is expressed in the statoacoustic ganglion (SAG, a sensory ganglion of ear) and posterior lateral line ganglion (pLL) in zebrafish. Knockdown of oxr1b in zebrafish resulted in a significant developmental defect of SAG and pLL. This phenotype can be rescued by co-injection of wild-type human OXR1 mRNAs, but not mutant OXR1 (c.233A > G) mRNAs. OXR1-associated pathway analysis revealed that mutations of TBC1D24, a TLDc-domain-containing homolog gene of OXR1, have previously been identified in patients with hearing loss. Interestingly, mutations or knockout of OXR1 interacting molecules such as ATP6V1B1 and ESR1 are also associated with hearing loss in patients or animal models, hinting an important role of OXR1 and associated partners in cochlear development and hearing function.
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Affiliation(s)
- Yuan Li
- Department of Otorhinolaryngology, China-Japan Friendship Hospital, Beijing 1000292, China
| | - Guozhu Ning
- Division of Cell, Developmental and Integrative Biology, School of Medicine, South China University of Technology, Guangzhou 5100063, China
- State Key Laboratory of Membrane Biology, Institute of Zoology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 1001014, China
| | - Baoling Kang
- Bioinformatics Section, Angen Gene Medicine Technology, Beijing 1001765, China
| | - Jinwen Zhu
- Bioinformatics Section, Angen Gene Medicine Technology, Beijing 1001765, China
| | | | - Qiang Wang
- Division of Cell, Developmental and Integrative Biology, School of Medicine, South China University of Technology, Guangzhou 5100063, China
| | - Tao Cai
- Experimental Medicine Section, National Institute of Dental and Craniofacial Research, NIH, Bethesda, MD 208927, USA
- Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD 20892, USA
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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] [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.
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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
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10
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Liu W, Rask-Andersen H. GJB2 and GJB6 gene transcripts in the human cochlea: A study using RNAscope, confocal, and super-resolution structured illumination microscopy. Front Mol Neurosci 2022; 15:973646. [PMID: 36204137 PMCID: PMC9530750 DOI: 10.3389/fnmol.2022.973646] [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: 06/20/2022] [Accepted: 08/01/2022] [Indexed: 11/26/2022] Open
Abstract
Background Gap junction (GJ) proteins, connexin26 and 30, are highly prevalent in the human cochlea (HC), where they are involved in transcellular signaling, metabolic supply, and fluid homeostasis. Their genes, GJB2 and GJB6, are both located at the DFNB1 locus on chromosome 13q12. Mutations in GJB2 may cause mild to profound non-syndromic deafness. Here, we analyzed for the first time the various expressions of GJB2 and GJB6 gene transcripts in the different cell networks in the HC using the RNAscope technique. Materials and methods Archival paraformaldehyde-fixed sections of surgically obtained HC were used to label single mRNA oligonucleotides using the sensitive multiplex RNAscope® technique with fluorescent-tagged probes. Positive and negative controls also included the localization of ATP1A1, ATP1A2, and KCNJ10 gene transcripts in order to validate the specificity of labeling. Results Confocal and super-resolution structured illumination microscopy (SR-SIM) detected single gene transcripts as brightly stained puncta. The GJB2 and GJB6 gene transcripts were distributed in the epithelial and connective tissue systems in all three cochlear turns. The largest number of GJB2 and GJB6 gene transcripts was in the outer sulcus, spiral ligament, and stria vascularis (SV). Oligonucleotides were present in the supporting cells of the organ of Corti (OC), spiral limbus fibrocytes, and the floor of the scala vestibuli. Multiplex gene data suggest that cells in the cochlear lateral wall contain either GJB2 or GJB6 gene transcripts or both. The GJB6, but not GJB2, gene transcripts were found in the intermediate cells but none were found in the marginal cells. There were no GJB2 or GJB6 gene transcripts found in the hair cells and only a few in the spiral ganglion cells. Conclusion Both GJB2 and GJB6 mRNA gene transcripts were localized in cells in the adult HC using RNAscope®in situ hybridization (ISH) and high resolution microscopy. Generally, GJB6 dominated over GJB2, except in the basal cells. Results suggest that cells may contain either GJB2 or GJB6 gene transcripts or both. This may be consistent with specialized GJ plaques having separate channel permeability and gating properties. A reduction in the number of GJB2 gene transcripts was found in the basal turn. Such information may be useful for future gene therapy.
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Shan Z, Ding L, Zhu C, Hong W. Medical Care of Rare and Undiagnosed Diseases: Prospects and Challenges. FUNDAMENTAL RESEARCH 2022. [DOI: 10.1016/j.fmre.2022.08.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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12
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Kim SY, Kim BJ, Oh DY, Han JH, Yi N, Kim NJ, Park MK, Keum C, Seo GH, Choi BY. Improving genetic diagnosis by disease-specific, ACMG/AMP variant interpretation guidelines for hearing loss. Sci Rep 2022; 12:12457. [PMID: 35864128 PMCID: PMC9304357 DOI: 10.1038/s41598-022-16661-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 07/13/2022] [Indexed: 12/29/2022] Open
Abstract
The 2018 Hearing Loss Expert Panel (HL-EP)-specific guidelines specified from the universal 2015 ACMG/AMP guidelines are proposed to be used in genetic HL, which prompted this study. A genetic HL cohort comprising 135 unrelated probands with available exome sequencing data was established. Overall, 169 variants were prioritized as candidates and interpreted using the 2015 ACMG/AMP and 2018 HL-EP guidelines. Changes in rule application and variant classification between the guidelines were compared. The concordance rate of variant classification of each variant between the guidelines was 71.60%, with significant difference. The proportion of pathogenic variants increased from 13.02% (2015) to 29.59% (2018). Variant classifications of autosomal recessive (AR) variants that previously belonged to VUS or likely pathogenic in the 2015 guidelines were changed toward pathogenic in the 2018 guidelines more frequently than those of autosomal dominant variants (29.17% vs. 6.38%, P = 0.005). Stratification of the PM3 and PP1 rules in the 2018 guidelines led to more substantial escalation than that in the 2015 guidelines. We compared the disease-specific guidelines (2018) with the universal guidelines (2015) using real-world data. Owing to the sophistication of case-level data, the HL-specific guidelines have more explicitly classified AR variants toward "likely pathogenic" or "pathogenic", serving as potential references for other recessive genetic diseases.
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Affiliation(s)
- So Young Kim
- grid.410886.30000 0004 0647 3511Department of Otorhinolaryngology-Head and Neck Surgery, CHA Bundang Medical Center, CHA University, Seongnam, South Korea
| | - Bong Jik Kim
- grid.254230.20000 0001 0722 6377Department of Otolaryngology-Head and Neck Surgery, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Daejeon, South Korea
| | - Doo Yi Oh
- grid.412480.b0000 0004 0647 3378Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Jin Hee Han
- grid.412480.b0000 0004 0647 3378Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Nayoung Yi
- grid.254230.20000 0001 0722 6377Department of Otolaryngology-Head and Neck Surgery, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Daejeon, South Korea ,grid.412480.b0000 0004 0647 3378Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Namju Justin Kim
- grid.412480.b0000 0004 0647 3378Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea ,grid.152326.10000 0001 2264 7217Department of Biological Sciences, Vanderbilt University, Nashville, USA
| | - Moo Kyun Park
- grid.31501.360000 0004 0470 5905Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, South Korea
| | | | | | - Byung Yoon Choi
- grid.412480.b0000 0004 0647 3378Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
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13
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Kakar MU, Akram M, Zubair Mehboob M, Younus M, Bilal M, Waqas A, Nazir A, Shafi M, Umair M, Ahmad S, Rafeeq MM. Identification of homozygous missense variant in SIX5 gene underlying recessive nonsyndromic hearing impairment. PLoS One 2022; 17:e0268078. [PMID: 35709191 PMCID: PMC9202841 DOI: 10.1371/journal.pone.0268078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 04/21/2022] [Indexed: 11/18/2022] Open
Abstract
Hearing impairment (HI) is a heterogeneous condition that affects many individuals globally with different age groups. HI is a genetically and phenotypically heterogeneous disorder. Over the last several years, many genes/loci causing rare autosomal recessive and dominant forms of hearing impairments have been identified, involved in various aspects of ear development. In the current study, two affected individuals of a consanguineous family exhibiting autosomal recessive nonsyndromic hearing impairment (AR-NSHI) were clinically and genetically characterized. The single affected individual (IV-2) of the family was subjected to whole-exome sequencing (WES) accompanied by traditional Sanger sequencing. Clinical examinations using air conduction audiograms of both the affected individuals showed profound hearing loss across all frequencies. WES revealed a homozygous missense variant (c.44G>C) in the SIX5 gene located on chromosome 19q13.32. We report the first case of autosomal recessive NSHI due to a biallelic missense variant in the SIX5 gene. This report further supports the evidence that the SIX5 variant might cause profound HI and supports its vital role in auditory function. Identification of novel candidate genes might help in application of future gene therapy strategies that may be implemented for NSHI, such as gene replacement using cDNA, gene silencing using RNA interference, and gene editing using the CRISPR/Cas9 system.
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Affiliation(s)
- Mohib Ullah Kakar
- Faculty of Marine Sciences, Lasbela University of Agriculture, Water and Marine Sciences (LUAWMS), Uthal, Balochistan, Pakistan
| | - Muhammad Akram
- Department of Life Sciences, School of Science, University of Management and Technology (UMT), Lahore, Pakistan
| | - Muhammad Zubair Mehboob
- CAS Center for Excellence in Biotic Interaction, College of Life Sciences, University of Chinese Academy of Science, Beijing, China
| | - Muhammad Younus
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, China
| | - Muhammad Bilal
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Ahmed Waqas
- Division of Science and Technology, Department of Zoology, University of Education Lahore, Lahore, Pakistan
| | - Amina Nazir
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Shandong Province, China
| | - Muhammad Shafi
- Faculty of Marine Sciences, Lasbela University of Agriculture, Water and Marine Sciences (LUAWMS), Uthal, Balochistan, Pakistan
- * E-mail: (MS); (MU)
| | - Muhammad Umair
- Department of Life Sciences, School of Science, University of Management and Technology (UMT), Lahore, Pakistan
- * E-mail: (MS); (MU)
| | - Sajjad Ahmad
- Faculty of Veterinary and Animal Sciences, Lasbela University of Agriculture, Water and Marine Sciences (LUAWMS), Uthal, Balochistan, Pakistan
| | - Misbahuddin M. Rafeeq
- Department of Pharmacology, Faculty of Medicine, Rabigh King Abdul Aziz University, Jeddah, KSA
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Peppercorn K, Kleffmann T, Jones O, Hughes S, Tate W. Secreted Amyloid Precursor Protein Alpha, a Neuroprotective Protein in the Brain Has Widespread Effects on the Transcriptome and Proteome of Human Inducible Pluripotent Stem Cell-Derived Glutamatergic Neurons Related to Memory Mechanisms. Front Neurosci 2022; 16:858524. [PMID: 35692428 PMCID: PMC9179159 DOI: 10.3389/fnins.2022.858524] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/14/2022] [Indexed: 11/18/2022] Open
Abstract
Secreted amyloid precursor protein alpha (sAPPα) processed from a parent human brain protein, APP, can modulate learning and memory. It has potential for development as a therapy preventing, delaying, or even reversing Alzheimer’s disease. In this study a comprehensive analysis to understand how it affects the transcriptome and proteome of the human neuron was undertaken. Human inducible pluripotent stem cell (iPSC)-derived glutamatergic neurons in culture were exposed to 1 nM sAPPα over a time course and changes in the transcriptome and proteome were identified with RNA sequencing and Sequential Window Acquisition of All THeoretical Fragment Ion Spectra-Mass Spectrometry (SWATH-MS), respectively. A large subset (∼30%) of differentially expressed transcripts and proteins were functionally involved with the molecular biology of learning and memory, consistent with reported links of sAPPα to memory enhancement, as well as neurogenic, neurotrophic, and neuroprotective phenotypes in previous studies. Differentially regulated proteins included those encoded in previously identified Alzheimer’s risk genes, APP processing related proteins, proteins involved in synaptogenesis, neurotransmitters, receptors, synaptic vesicle proteins, cytoskeletal proteins, proteins involved in protein and organelle trafficking, and proteins important for cell signalling, transcriptional splicing, and functions of the proteasome and lysosome. We have identified a complex set of genes affected by sAPPα, which may aid further investigation into the mechanism of how this neuroprotective protein affects memory formation and how it might be used as an Alzheimer’s disease therapy.
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Affiliation(s)
- Katie Peppercorn
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
- Brain Health Research Centre, University of Otago, Dunedin, New Zealand
| | - Torsten Kleffmann
- Division of Health Sciences, Research Infrastructure Centre, University of Otago, Dunedin, New Zealand
| | - Owen Jones
- Brain Health Research Centre, University of Otago, Dunedin, New Zealand
- Department of Psychology, University of Otago, Dunedin, New Zealand
| | - Stephanie Hughes
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
- Brain Health Research Centre, University of Otago, Dunedin, New Zealand
| | - Warren Tate
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
- Brain Health Research Centre, University of Otago, Dunedin, New Zealand
- *Correspondence: Warren Tate,
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15
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Gao Y, Zhang Q, Zhang S, Yang L, Liu Y, Liu Y, Wang T. A Connexin Gene (GJB3) Mutation in a Chinese Family With Erythrokeratodermia Variabilis, Ichthyosis and Nonsyndromic Hearing Loss: Case Report and Mutations Update. Front Genet 2022; 13:797124. [PMID: 35677558 PMCID: PMC9168653 DOI: 10.3389/fgene.2022.797124] [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: 11/20/2021] [Accepted: 03/28/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Gap junctions formed by connexins are channels on cytoplasm functioning in ion recycling and homeostasis. Some members of connexin family including connexin 31 are significant components in human skin and cochlea. In clinic, mutations of connexin 31 have been revealed as the cause of a rare hereditary skin disease called erythrokeratodermia variabilis (EKV) and non-syndromic hearing loss (NSHL).Objective: To determine the underlying genetic cause of EKV, ichthyosis and NSHL in three members of a Chinese pedigree and skin histologic characteristics of the EKV patient.Methods: By performing whole exome sequencing (WES), Sanger sequencing and skin biopsy, we demonstrate a Chinese pedigree carrying a mutation of GJB3 with three patients separately diagnosed with EKV, ichthyosis and NSHL.Results: The proband, a 6-year-old Chinese girl, presented with demarcated annular red-brown plaques and hyperkeratotic scaly patches on her trunk and limbs. Her mother has ichthyosis with hyperkeratosis and geographic tongue while her younger brother had NSHL since birth. Mutation analysis revealed all of them carried a heterozygous missense mutation c.293G>A of GJB3. Skin biopsy showed many grain cells with dyskeratosis in the granular layer. Acanthosis, papillomatosis, and a mild superficial perivascular lymphocytic infiltrate were observed.Conclusion: A mutation of GJB3 associated with EKV, ichthyosis and NSHL is reported in this case. The daughter with EKV and the son with NSHL in this Chinese family inherited the mutation from their mother with ichthyosis. The variation of clinical features may involve with genetic, epigenetic and environmental factors.
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Affiliation(s)
- Yajuan Gao
- State Key Laboratory of Complex Severe and Rare Diseases, Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, China
| | - Qianli Zhang
- Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shiyu Zhang
- State Key Laboratory of Complex Severe and Rare Diseases, Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, China
| | - Lu Yang
- State Key Laboratory of Complex Severe and Rare Diseases, Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, China
| | - Yaping Liu
- Department of Medical Genetics and National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- *Correspondence: Yaping Liu, ; Yuehua Liu, ; Tao Wang,
| | - Yuehua Liu
- State Key Laboratory of Complex Severe and Rare Diseases, Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, China
- *Correspondence: Yaping Liu, ; Yuehua Liu, ; Tao Wang,
| | - Tao Wang
- State Key Laboratory of Complex Severe and Rare Diseases, Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, China
- *Correspondence: Yaping Liu, ; Yuehua Liu, ; Tao Wang,
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16
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Lukowicz-Bedford RM, Farnsworth DR, Miller AC. Connexinplexity: the spatial and temporal expression of connexin genes during vertebrate organogenesis. G3 (BETHESDA, MD.) 2022; 12:jkac062. [PMID: 35325106 PMCID: PMC9073686 DOI: 10.1093/g3journal/jkac062] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 02/24/2022] [Indexed: 11/28/2022]
Abstract
Animal development requires coordinated communication between cells. The Connexin family of proteins is a major contributor to intercellular communication in vertebrates by forming gap junction channels that facilitate the movement of ions, small molecules, and metabolites between cells. Additionally, individual hemichannels can provide a conduit to the extracellular space for paracrine and autocrine signaling. Connexin-mediated communication is widely used in epithelial, neural, and vascular development and homeostasis, and most tissues likely use this form of communication. In fact, Connexin disruptions are of major clinical significance contributing to disorders developing from all major germ layers. Despite the fact that Connexins serve as an essential mode of cellular communication, the temporal and cell-type-specific expression patterns of connexin genes remain unknown in vertebrates. A major challenge is the large and complex connexin gene family. To overcome this barrier, we determined the expression of all connexins in zebrafish using single-cell RNA-sequencing of entire animals across several stages of organogenesis. Our analysis of expression patterns has revealed that few connexins are broadly expressed, but rather, most are expressed in tissue- or cell-type-specific patterns. Additionally, most tissues possess a unique combinatorial signature of connexin expression with dynamic temporal changes across the organism, tissue, and cell. Our analysis has identified new patterns for well-known connexins and assigned spatial and temporal expression to genes with no-existing information. We provide a field guide relating zebrafish and human connexin genes as a critical step toward understanding how Connexins contribute to cellular communication and development throughout vertebrate organogenesis.
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Affiliation(s)
| | - Dylan R Farnsworth
- Institute of Neuroscience, Department of Biology, University of Oregon, Eugene, OR 97403, USA
| | - Adam C Miller
- Institute of Neuroscience, Department of Biology, University of Oregon, Eugene, OR 97403, USA
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17
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Luo H, Yang Y, Wang X, Xu F, Huang C, Liu D, Zhang L, Huang T, Ma P, Lu Q, Huang S, Yang B, Zou Y, Liu Y. Concurrent newborn hearing and genetic screening of common hearing loss variants with bloodspot-based targeted next generation sequencing in Jiangxi province. Front Pediatr 2022; 10:1020519. [PMID: 36389375 PMCID: PMC9659731 DOI: 10.3389/fped.2022.1020519] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/06/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND AND AIMS Concurrent hearing and genetic screening of newborns have been widely adopted as an effective strategy in early diagnosis and intervention for hearing loss in many cities in China. Here, we aimed to firstly explore the efficacy of combining conventional hearing screening with genetic screening among the large-scale newborns in Jiangxi Province. METHODS A total of 24,349 newborns from Jiangxi Maternal and Child Health Hospital were enrolled in our study from April 2021 to June 2022. Newborn hearing screening was conducted using otoacoustic emission (OAE) and automated auditory brainstem response (AABR). Meanwhile, newborn dried blood spots were collected and twenty common variants in four genes, including GJB2, SLC26A4, MT-RNR1(12SrRNA), and GJB3, were screened using a BGISEQ-500 next generation sequencing platform. Whole coding regions sequencing of GJB2 and SLC26A4 were performed by Sanger sequencing and NGS, respectively. Following up of hearing for the newborns was undertaken by phone interviews. RESULTS Among the 24,349 newborns, 7.00% (1,704/24,349) were bilaterally or unilaterally referred in their initial hearing screening, whereas 1.30% (316/24,349) exhibited bilateral or unilateral hearing loss in the repeated screening. Genetic screening revealed that 4.813% (1,172/24,349) of the screened newborns were positive for at least one mutant allele (heterozygote, homozygote, or compound heterozygote in one gene, mtDNA homoplasmy or heteroplasmy and combined variants in different genes). A total of 1,146 individuals were identified with mutant allele in one gene, including 525 of GJB2, 371 of SLC26A4, 189 as homoplasmic or heteroplasmic of MT-RNR1, and 61 of GJB3, indicating that GJB2 and SLC26A4 are the most common endemic deafness-associated genes among newborns in Jiangxi Province. Nineteen newborns were detected with combined heterozygous variants in different genes, with "c.235delC heterozygous and c.919-2A > G heterozygous" as the most prevalent genotype. Additionally, seven newborns were screened as homozygotes or compound heterozygotes responsible for congenital or late-onset prelingual hearing loss, including three cases with GJB2 c.235delC homozygous and one with SLC26A4 c.919-2A > G homozygous variant, one case with compound heterozygous variants for GJB2 and two with compound heterozygous variants for SLC26A4. Coding regions sequencing of GJB2 or SLC26A4 for overall 265 infants revealed that 14 individuals were identified as compound heterozygote with a second pathogenic variant not screened by our genetic panel. CONCLUSIONS Herein our study firstly investigated the efficacy of concurrent hearing screening and genetic screening of common hearing impairment variants among large-scale newborns in Jiangxi Province. Concurrent screening provides a more comprehensive approach for management of congenital or delayed onset prelingual hearing loss and prevention of drug-induced hearing impairment for newborns at risk as well as their maternal relatives. An insight into the molecular epidemiology for hearing loss genes among Jiangxi population will also be beneficial to the genetic counseling and birth defect prevention.
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Affiliation(s)
- Haiyan Luo
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Yan Yang
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Xinrong Wang
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Fangping Xu
- Department of Obstetrics, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, China
| | - Cheng Huang
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Danping Liu
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Liuyang Zhang
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Ting Huang
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Pengpeng Ma
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Qing Lu
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Shuhui Huang
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Bicheng Yang
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Yongyi Zou
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Yanqiu Liu
- Department of Medical Genetics, Jiangxi Key Laboratory of Birth Defect Prevention and Control, Jiangxi Maternal and Child Health Hospital, Nanchang, China
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18
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Kim SY, Lee S, Seo GH, Kim BJ, Oh DY, Han JH, Park MK, Lee SM, Kim B, Yi N, Kim NJ, Koh DH, Hwang S, Keum C, Choi BY. Powerful use of automated prioritization of candidate variants in genetic hearing loss with extreme etiologic heterogeneity. Sci Rep 2021; 11:19476. [PMID: 34593925 PMCID: PMC8484668 DOI: 10.1038/s41598-021-99007-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 08/17/2021] [Indexed: 01/02/2023] Open
Abstract
Variant prioritization of exome sequencing (ES) data for molecular diagnosis of sensorineural hearing loss (SNHL) with extreme etiologic heterogeneity poses a significant challenge. This study used an automated variant prioritization system (“EVIDENCE”) to analyze SNHL patient data and assess its diagnostic accuracy. We performed ES of 263 probands manifesting mild to moderate or higher degrees of SNHL. Candidate variants were classified according to the 2015 American College of Medical Genetics guidelines, and we compared the accuracy, call rates, and efficiency of variant prioritizations performed manually by humans or using EVIDENCE. In our in silico panel, 21 synthetic cases were successfully analyzed by EVIDENCE. In our cohort, the ES diagnostic yield for SNHL by manual analysis was 50.19% (132/263) and 50.95% (134/263) by EVIDENCE. EVIDENCE processed ES data 24-fold faster than humans, and the concordant call rate between humans and EVIDENCE was 97.72% (257/263). Additionally, EVIDENCE outperformed human accuracy, especially at discovering causative variants of rare syndromic deafness, whereas flexible interpretations that required predefined specific genotype–phenotype correlations were possible only by manual prioritization. The automated variant prioritization system remarkably facilitated the molecular diagnosis of hearing loss with high accuracy and efficiency, fostering the popularization of molecular genetic diagnosis of SNHL.
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Affiliation(s)
- So Young Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
| | - Seungmin Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.,R&D Center, ENCell Co. Ltd, Seoul, Republic of Korea
| | - Go Hun Seo
- 3billion, Inc., Seoul, Republic of Korea
| | - Bong Jik Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University Sejong Hospital, College of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Doo Yi Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Moo Kyun Park
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - So Min Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
| | - Bonggi Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Nayoung Yi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Namju Justin Kim
- Department of Biological Sciences, Vanderbilt University, Nashville, USA
| | - Doo Hyun Koh
- Department of Biomedical Science, The Graduate School, CHA University, Seongnam, Republic of Korea
| | - Sohyun Hwang
- Department of Biomedical Science, The Graduate School, CHA University, Seongnam, Republic of Korea.,Department of Pathology, CHA University, CHA Bundang Medical Center, Seongnam, Republic of Korea
| | | | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
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19
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Gap Junction Channelopathies and Calmodulinopathies. Do Disease-Causing Calmodulin Mutants Affect Direct Cell-Cell Communication? Int J Mol Sci 2021; 22:ijms22179169. [PMID: 34502077 PMCID: PMC8431743 DOI: 10.3390/ijms22179169] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/19/2021] [Accepted: 08/21/2021] [Indexed: 11/24/2022] Open
Abstract
The cloning of connexins cDNA opened the way to the field of gap junction channelopathies. Thus far, at least 35 genetic diseases, resulting from mutations of 11 different connexin genes, are known to cause numerous structural and functional defects in the central and peripheral nervous system as well as in the heart, skin, eyes, teeth, ears, bone, hair, nails and lymphatic system. While all of these diseases are due to connexin mutations, minimal attention has been paid to the potential diseases of cell–cell communication caused by mutations of Cx-associated molecules. An important Cx accessory protein is calmodulin (CaM), which is the major regulator of gap junction channel gating and a molecule relevant to gap junction formation. Recently, diseases caused by CaM mutations (calmodulinopathies) have been identified, but thus far calmodulinopathy studies have not considered the potential effect of CaM mutations on gap junction function. The major goal of this review is to raise awareness on the likely role of CaM mutations in defects of gap junction mediated cell communication. Our studies have demonstrated that certain CaM mutants affect gap junction channel gating or expression, so it would not be surprising to learn that CaM mutations known to cause diseases also affect cell communication mediated by gap junction channels.
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20
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Cai L, Liu Y, Xu Y, Yang H, Lv L, Li Y, Chen Q, Lin X, Yang Y, Hu G, Zheng G, Zhou J, Qian Q, Xu MA, Fang J, Ding J, Chen W, Gao J. Multi-Center in-Depth Screening of Neonatal Deafness Genes: Zhejiang, China. Front Genet 2021; 12:637096. [PMID: 34276761 PMCID: PMC8282931 DOI: 10.3389/fgene.2021.637096] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 05/07/2021] [Indexed: 11/13/2022] Open
Abstract
Purpose The conventional genetic screening for deafness involves 9-20 variants from four genes. This study expands screening to analyze the mutation types and frequency of hereditary deafness genes in Zhejiang, China, and explore the significance of in-depth deafness genetic screening in newborns. Methods This was a multi-centre study conducted in 5,120 newborns from 12 major hospitals in the East-West (including mountains and islands) of Zhejiang Province. Concurrent hearing and genetic screening was performed. For genetic testing, 159 variants of 22 genes were screened, including CDH23, COL11A1, DFNA5, DFNB59, DSPP, GJB2, GJB3, KCNJ10, MT-RNR1, MT-TL1, MT-TS1, MYO15A, MYO7A, OTOF, PCDH15, SLC26A4, SOX10, TCOF1, TMC1, USH1G, WFS1, and WHRN using next-generation sequencing. Newborns who failed to have genetic mutations or hearing screening were diagnosed audiologically at the age of 6 months. Results A total of 4,893 newborns (95.57%) have passed the initial hearing screening, and 7 (0.14%) have failed in repeated screening. Of these, 446 (8.71%) newborns carried at least one genetic deafness-associated variant. High-risk pathogenic variants were found in 11 newborns (0.21%) (nine homozygotes and two compound heterozygotes), and eight of these infants have passed the hearing screening. The frequency of mutations in GJB2, GJB3, SLC26A4, 12SrRNA, and TMC1 was 5.43%, 0.59%, 1.91%, 0.98%, and 0.02%, respectively. The positive rate of in-depth screening was significantly increased when compared with 20 variants in four genes of traditional testing, wherein GJB2 was increased by 97.2%, SLC26A4 by 21% and MT-RNR1 by 150%. The most common mutation variants were GJB2c.235delC and SLC26A4c.919-2A > G, followed by GJB2c.299_300delAT. Homoplasmic mutation in MT-RNR1 was the most common, including m.1555A > G, m.961T > C, m.1095T > C. All these infants have passed routine hearing screening. The positive rate of MT-RNR1 mutation was significantly higher in newborns with high-risk factors of maternal pregnancy. Conclusion The positive rate of deafness gene mutations in the Zhejiang region is higher than that of the database, mainly in GJB2c.235delC, SLC26A4 c.919-2A > G, and m.1555A > G variants. The expanded genetic screening in the detection rate of diseasecausing variants was significantly improved. It is helpful in identifying high-risk children for follow-up intervention.
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Affiliation(s)
- Luhang Cai
- Department of Otorhinolaryngology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Ya Liu
- Department of Otorhinolaryngology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Yaping Xu
- Department of Otorhinolaryngology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Hang Yang
- Department of Otorhinolaryngology, Jiangshan People's Hospital, Quzhou, China
| | - Lihui Lv
- Department of Otorhinolaryngology, Fenghua People's Hospital, Ningbo, China
| | - Yang Li
- Department of Obstetrics, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Qiongqiong Chen
- Department of Otorhinolaryngology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaojiang Lin
- Department of Otorhinolaryngology, Kaihua People's Hospital, Quzhou, China
| | - Yihui Yang
- Department of Otorhinolaryngology, Ningbo Women and Children's Hospital, Ningbo, China
| | - Guangwei Hu
- Department of Otorhinolaryngology, Zhoushan Hospital, Zhoushan, China
| | - Guofeng Zheng
- Department of Otorhinolaryngology, Shaoxing Second Hospital, Shaoxing, China
| | - Jing Zhou
- Department of Otorhinolaryngology, Ruian People's Hospital, Wenzhou, China
| | - Qiyong Qian
- Department of Otorhinolaryngology, Shengzhou People's Hospital, Shaoxing, China
| | - Mei-Ai Xu
- Department of Otorhinolaryngology, Sanmen People's Hospital, Taizhou, China
| | - Jin Fang
- Department of Otorhinolaryngology, Zhejiang Xin'an International Hospital, Jiaxing, China
| | - Jianjun Ding
- Department of Otorhinolaryngology, Linhai First People's Hospital, Taizhou, China
| | - Wei Chen
- Department of Otorhinolaryngology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jiong Gao
- Beijing Genomics Institute, Shenzhen, China
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21
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Association Analysis of Candidate Gene Polymorphisms and Audiometric Measures of Noise-Induced Hearing Loss in Young Musicians. Otol Neurotol 2021; 41:e538-e547. [PMID: 32176153 DOI: 10.1097/mao.0000000000002615] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
INTRODUCTION This study aimed to investigate the association between candidate genetic variants and audiometric measures of noise-induced hearing loss (NIHL) in young musicians. METHODS The study analyzed a database by Phillips et al. (Feasibility of a bilateral 4000-6000 Hz notch as a phenotype for genetic association analysis. Int J Audiol 2015;54:645-52.) which included behavioral hearing thresholds, distortion-product otoacoustic emissions (DPOAE), tympanometric, and genetic data of 166 participants meeting the inclusion criteria. Nineteen single nucleotide polymorphisms (SNPs) in 13 cochlear genes previously associated with NIHL in factory workers were included in the present investigation. The average hearing threshold at 3000 and 4000 Hz (AHT) and average DPOAE signal to noise ratio (DPOAE SNR) in both ears were calculated. RESULTS The regression analyses showed that two SNPs- one in KCNE1 (rs2070358) and the other in CAT (rs12273124) revealed a statistically significant relationship with DPOAE SNR in both ears. Two SNPs in MYH14 and one in GJB4 revealed a significant association with DPOAE SNR in the left ear. Two SNPs in HSP70, one in CDH23 and one in KCNJ10 showed significant association with DPOAE SNR in the right ear. None of the included SNPs showed association with AHT in both ears. CONCLUSIONS A genetic variant in KCNE1 was associated with the strength of the cochlear amplifier as assessed by DPOAE SNR. Musicians carrying causal genetic variants to NIHL might exhibit changes in their auditory functions early in the lifespan even when most subjects had their hearing thresholds within normal limits. These participants are likely to show the clinical manifestation of NIHL in the future if no preventive measures are applied.
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22
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Aliazami F, Farhud D, Zarif-Yeganeh M, Salehi S, Hosseinipour A, Sasanfar R, Eslami M. Gjb3 Gene Mutations in Non-Syndromic Hearing Loss of Bloch, Kurd, and Turkmen Ethnicities in Iran. IRANIAN JOURNAL OF PUBLIC HEALTH 2021; 49:2128-2135. [PMID: 33708733 PMCID: PMC7917519 DOI: 10.18502/ijph.v49i11.4730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Background: Hearing loss (HL) is one of the most common heterogeneous congenital disabilities worldwide. Gap junction protein β-3 (GJB3) gene encodes Connexin31 protein (Cx31). The hereditary type of hearing impairment in this gene are known to cause both autosomal recessive and autosomal dominant form. In addition, GJB3 mutations have been involved in sensorineural deafness, erythrokeratodermia variabilis (EKV), and neuropathy diseases. We aimed to investigate GJB3 mutations in people suffering from HL among three different ethnicities of Iranian population (Baloch, Kurd, and Turkmen). Methods: In this descriptive study, 50 GJB2-negative non-syndromic hearing loss (NSHL) Iranian individuals from 3 ethnic groups of Baloch (n=17), Kurd (n =15) and Turkmen (n=18) were enrolled. DNA extractions, PCR, and mutation detection was carried out for the two large deletions of the GJB6, del (GJB6 -D13S1830,) and del (GJB6 -D13S1854) followed by direct DNA sequencing method for the GJB3. Results: DNA sequencing of GJB3 was shown a missense heterozygous mutation rs199689484 (NM_024009.3) GJB3: c.340G>A (p.Ala114Thr) in a Baloch patient, and a polymorphism rs35983826 (NM_024009.3) GJB3: c.798C>T (p.Asn266=) in a Turkman patient, in coding region of the GJB3. We did not detect del (GJB6 -D13S1830) and del (GJB6 -D13S1854) among these three ethnicities in Iran. Conclusion: Deafness is a heterogeneous disorder. Specific genes and mutations contribute to hearing loss that varies from locus to locus as well as from population to population.
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Affiliation(s)
- Farnoush Aliazami
- Department of Genetics, Tehran Medical Branch, Islamic Azad University, Tehran, Iran.,Applied Biotechnology Research Center, Tehran Medical Branch, Islamic Azad University, Tehran, Iran
| | - Dariush Farhud
- School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.,Department of Basic Sciences, Iranian Academy of Medical Sciences, Tehran, Iran
| | - Marjan Zarif-Yeganeh
- Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Siamak Salehi
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | - Azam Hosseinipour
- Department of Exceptional Children, Ministry of Education and Training of the Islamic Republic of Iran, Tehran, Iran
| | - Roxana Sasanfar
- Psychiatric and Neurodevelopmental Genetic Unit, Massachusetts General Hospital, Harvard Medical School, Boston, USA
| | - Maryam Eslami
- Department of Genetics, Tehran Medical Branch, Islamic Azad University, Tehran, Iran.,Applied Biotechnology Research Center, Tehran Medical Branch, Islamic Azad University, Tehran, Iran
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23
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The Complex and Critical Role of Glycine 12 (G12) in Beta-Connexins of Human Skin. Int J Mol Sci 2021; 22:ijms22052615. [PMID: 33807656 PMCID: PMC7961983 DOI: 10.3390/ijms22052615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/02/2021] [Accepted: 03/03/2021] [Indexed: 11/28/2022] Open
Abstract
Glycine is an amino acid with unique properties because its side chain is composed of a single hydrogen atom. It confers conformational flexibility to proteins and conserved glycines are often indicative of protein domains involving tight turns or bends. All six beta-type connexins expressed in human epidermis (Cx26, Cx30, Cx30.3, Cx31, Cx31.1 and Cx32) contain a glycine at position 12 (G12). G12 is located about halfway through the cytoplasmic amino terminus and substitutions alter connexin function in a variety of ways, in some cases altering protein interactions and leading to cell death. There is also evidence that alteration of G12 changes the structure of the amino terminus in connexin- and amino acid- specific ways. This review integrates structural, functional and physiological information about the role of G12 in connexins, focusing on beta-connexins expressed in human epidermis. The importance of G12 substitutions in these beta-connexins is revealed in two hereditary skin disorders, keratitis ichthyosis and erythrokeratodermia variabilis, both of which result from missense mutations affecting G12.
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24
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Mi Y, Liu D, Zeng B, Tian Y, Zhang H, Chen B, Zhang J, Xue H, Tang W, Zhao Y, Xu H. Early truncation of the N-terminal variable region of EYA4 gene causes dominant hearing loss without cardiac phenotype. Mol Genet Genomic Med 2020; 9:e1569. [PMID: 33301229 PMCID: PMC7963430 DOI: 10.1002/mgg3.1569] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 10/31/2020] [Accepted: 11/17/2020] [Indexed: 12/30/2022] Open
Abstract
Background Autosomal dominant hearing loss (ADHL) accounts for about 20% of all hereditary non‐syndromic HL. Truncating mutations of the EYA4 gene can cause either non‐syndromic ADHL or syndromic ADHL with cardiac abnormalities. It has been proposed that truncations of the C‐terminal Eya domain lead to non‐syndromic HL, whereas early truncations of the N‐terminal variable region cause syndromic HL with cardiac phenotype. Methods The proband and all the other hearing impaired members of the family underwent a thorough clinical and audiological evaluation. The cardiac phenotype was examined by ECG and echocardiography. Their DNA was subjected to target exome sequencing of 129 known deafness genes. The sequencing data were analyzed and the candidate variants were interpreted following the ACMG guidelines for clinical sequence interpretation. The effect of candidate variant on EYA4 gene expression was assessed by quantitative PCR and western blot of gene production in blood. Results We report a Chinese family cosegregating post‐lingual onset, progressive ADHL with a novel nonsense mutation NM_004100.4:c.543C>G (p.Tyr181Ter) of EYA4. Two affected members show no cardiac abnormalities at least until now revealed by electrocardiography and echocardiography. The overall expression level of the EYA4 gene in the proband was lower than that in his unaffected relative. Conclusion This report expands the mutational spectrum of the EYA4 gene and highlights the fact that more data are needed to elucidate the complex genotype–phenotype correlation of EYA4 mutations.
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Affiliation(s)
- Yanfang Mi
- Department of Otorhinolaryngology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Danhua Liu
- Precision Medicine Center, Academy of Medical Science, Zhengzhou University, Zhengzhou, China.,The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Beiping Zeng
- BGI College, Zhengzhou University, Zhengzhou, China.,Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China
| | - Yongan Tian
- BGI College, Zhengzhou University, Zhengzhou, China.,Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China
| | - Hui Zhang
- Department of Cardiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Bei Chen
- Department of Otorhinolaryngology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Juanli Zhang
- Henan Province Medical Instrument Testing Institute, Zhengzhou, China
| | - Hong Xue
- Sanglin Biotechnology Ltd, Zhengzhou, China
| | - Wenxue Tang
- Precision Medicine Center, Academy of Medical Science, Zhengzhou University, Zhengzhou, China.,Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China.,The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yulin Zhao
- Department of Otorhinolaryngology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Hongen Xu
- Precision Medicine Center, Academy of Medical Science, Zhengzhou University, Zhengzhou, China
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25
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Adadey SM, Wonkam-Tingang E, Twumasi Aboagye E, Nayo-Gyan DW, Boatemaa Ansong M, Quaye O, Awandare GA, Wonkam A. Connexin Genes Variants Associated with Non-Syndromic Hearing Impairment: A Systematic Review of the Global Burden. Life (Basel) 2020; 10:life10110258. [PMID: 33126609 PMCID: PMC7693846 DOI: 10.3390/life10110258] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/18/2020] [Accepted: 10/27/2020] [Indexed: 12/21/2022] Open
Abstract
Mutations in connexins are the most common causes of hearing impairment (HI) in many populations. Our aim was to review the global burden of pathogenic and likely pathogenic (PLP) variants in connexin genes associated with HI. We conducted a systematic review of the literature based on targeted inclusion/exclusion criteria of publications from 1997 to 2020. The databases used were PubMed, Scopus, Africa-Wide Information, and Web of Science. The protocol was registered on PROSPERO, the International Prospective Register of Systematic Reviews, with the registration number “CRD42020169697”. The data extracted were analyzed using Microsoft Excel and SPSS version 25 (IBM, Armonk, New York, United States). A total of 571 independent studies were retrieved and considered for data extraction with the majority of studies (47.8% (n = 289)) done in Asia. Targeted sequencing was found to be the most common technique used in investigating connexin gene mutations. We identified seven connexin genes that were associated with HI, and GJB2 (520/571 publications) was the most studied among the seven. Excluding PLP in GJB2, GJB6, and GJA1 the other connexin gene variants (thus GJB3, GJB4, GJC3, and GJC1 variants) had conflicting association with HI. Biallelic GJB2 PLP variants were the most common and widespread variants associated with non-syndromic hearing impairment (NSHI) in different global populations but absent in most African populations. The most common GJB2 alleles found to be predominant in specific populations include; p.Gly12ValfsTer2 in Europeans, North Africans, Brazilians, and Americans; p.V37I and p.L79Cfs in Asians; p.W24X in Indians; p.L56Rfs in Americans; and the founder mutation p.R143W in Africans from Ghana, or with putative Ghanaian ancestry. The present review suggests that only GJB2 and GJB3 are recognized and validated HI genes. The findings call for an extensive investigation of the other connexin genes in many populations to elucidate their contributions to HI, in order to improve gene-disease pair curations, globally.
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Affiliation(s)
- Samuel Mawuli Adadey
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, P.O. Box LG 54, Legon GA184, Accra, Greater Accra Region, Ghana; (S.M.A.); (O.Q.); (G.A.A.)
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
| | - Edmond Wonkam-Tingang
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
| | - Elvis Twumasi Aboagye
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
| | - Daniel Wonder Nayo-Gyan
- Department of Applied Chemistry and Biochemistry, C. K. Tedam University of Technology and Applied Sciences, P.O. Box 24, Navrongo 00000, Upper East Region, Ghana;
| | - Maame Boatemaa Ansong
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
| | - Osbourne Quaye
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, P.O. Box LG 54, Legon GA184, Accra, Greater Accra Region, Ghana; (S.M.A.); (O.Q.); (G.A.A.)
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
| | - Gordon A. Awandare
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, P.O. Box LG 54, Legon GA184, Accra, Greater Accra Region, Ghana; (S.M.A.); (O.Q.); (G.A.A.)
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
| | - Ambroise Wonkam
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
- Correspondence: ; Tel.: +27-21-4066307
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26
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Gene therapy development in hearing research in China. Gene Ther 2020; 27:349-359. [PMID: 32681137 DOI: 10.1038/s41434-020-0177-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/13/2020] [Accepted: 07/08/2020] [Indexed: 12/15/2022]
Abstract
Sensorineural hearing loss, the most common form of hearing impairment, is mainly attributable to genetic mutations or acquired factors, such as aging, noise exposure, and ototoxic drugs. In the field of gene therapy, advances in genetic and physiological studies and profound increases in knowledge regarding the underlying mechanisms have yielded great progress in terms of restoring the auditory function in animal models of deafness. Nonetheless, many challenges associated with the translation from basic research to clinical therapies remain to be overcome before a total restoration of auditory function can be expected. In recent years, Chinese research teams have promoted various developmental efforts in this field, including gene sequencing to identify additional potential loci that cause deafness, studies to elucidate the underlying molecular mechanisms, and research to optimize vectors and delivery routes. In this review, we summarize the state of the field and focus mainly on the progress of gene therapy in animal model studies and the optimization of therapeutic strategies in China.
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27
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Yee KT, Neupane B, Bai F, Vetter DE. Zika virus infection causes widespread damage to the inner ear. Hear Res 2020; 395:108000. [PMID: 32623238 DOI: 10.1016/j.heares.2020.108000] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 02/07/2020] [Accepted: 05/20/2020] [Indexed: 12/20/2022]
Abstract
Zika virus (ZIKV) has been recently recognized as a causative agent of newborn microcephaly, as well as other neurological consequences. A less well recognized comorbidity of prenatal ZIKV infection is hearing loss, but cases of hearing impairment following adult ZIKV infection have also been recognized. Diminished hearing following prenatal ZIKV infection in a mouse model has been reported, but no cellular consequences were observed. We examined the effects of ZIKV infection on inner ear cellular integrity and expression levels of various proteins important for cochlear function in type I interferon receptor null (Ifnar1-/-) mice following infection at 5-6 weeks of age. We show that ZIKV antigens are present in cells within the cochlear epithelium, lateral wall, spiral limbus and spiral ganglion. Here we show that ZIKV infection alters cochlear expression of genes that signal cell damage (S100B), transport fluids (AQP1), are gaseous transmitters (eNOs) and modulate immune response (F4/80). Morphological analyses shows that not only are cochlear structures compromised by ZIKV infection, but damage also occurs in vestibular end organs. ZIKV produces a graded distribution of cellular damage in the cochlea, with greatest damage in the apex similar to that reported for cytomegalovirus (CMV) infection. The graded distribution of damage may indicate a differential susceptibility to ZIKV along the cochlear tonotopic axis. Collectively, these data are the first to show the molecular and morphological damage to the inner ear induced by ZIKV infection in adults and suggests multiple mechanisms contributing to the hearing loss reported in the human population.
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Affiliation(s)
- Kathleen T Yee
- Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, MS, 39202, USA
| | - Biswas Neupane
- Department of Cell and Molecular Biology, University of Southern Mississippi, Hattiesburg, MS, 39406, USA
| | - Fengwei Bai
- Department of Cell and Molecular Biology, University of Southern Mississippi, Hattiesburg, MS, 39406, USA.
| | - Douglas E Vetter
- Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, MS, 39202, USA.
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28
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The Functional Role of CONNEXIN 26 Mutation in Nonsyndromic Hearing Loss, Demonstrated by Zebrafish Connexin 30.3 Homologue Model. Cells 2020; 9:cells9051291. [PMID: 32455934 PMCID: PMC7290585 DOI: 10.3390/cells9051291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [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.
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Ahmadmehrabi S, Brant J, Epstein DJ, Ruckenstein MJ, Rader DJ. Genetics of Postlingual Sensorineural Hearing Loss. Laryngoscope 2020; 131:401-409. [PMID: 32243624 DOI: 10.1002/lary.28646] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 02/19/2020] [Accepted: 02/28/2020] [Indexed: 12/11/2022]
Abstract
Literature and clinical practice around adult-onset hearing loss (HL) has traditionally focused on environmental risk factors, including noise exposure, ototoxic drug exposure, and cardiovascular disease. The most common diagnosis in adult-onset HL is presbycusis. However, the age of onset of presbycusis varies, and patients often describe family history of HL as well as individual variation in progression and severity. In recent years, there has been accumulating evidence of gene-environment interactions underlying adult cases of HL. Susceptibility loci for age-related HL have been identified, and genes related to postlingual nonsyndromic HL continue to be discovered through individual reports and genome-wide association studies. This review will outline main concepts in genetics as related to HL, identify implicated genes, and discuss clinical implications. Laryngoscope, 131:401-409, 2021.
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Affiliation(s)
- Shadi Ahmadmehrabi
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA.,Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jason Brant
- Department of Otorhinolaryngology Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Douglas J Epstein
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Michael J Ruckenstein
- Department of Otorhinolaryngology Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Daniel J Rader
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
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Small fish, big prospects: using zebrafish to unravel the mechanisms of hereditary hearing loss. Hear Res 2020; 397:107906. [PMID: 32063424 DOI: 10.1016/j.heares.2020.107906] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/13/2020] [Accepted: 01/29/2020] [Indexed: 12/16/2022]
Abstract
Over the past decade, advancements in high-throughput sequencing have greatly enhanced our knowledge of the mutational signatures responsible for hereditary hearing loss. In its present state, the field has a largely uncensored view of protein coding changes in a growing number of genes that have been associated with hereditary hearing loss, and many more that have been proposed as candidate genes. Sequencing data can now be generated using methods that have become widespread and affordable. The greatest hurdles facing the field concern functional validation of uncharacterized genes and rapid application to human diseases, including hearing and balance disorders. To date, over 30 hearing-related disease models exist in zebrafish. New genome editing technologies, including CRISPR/Cas9 will accelerate the functional validation of hearing loss genes and variants in zebrafish. Here, we discuss current progress in the field and recent advances in genome editing approaches.
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Furness DN. Forgotten Fibrocytes: A Neglected, Supporting Cell Type of the Cochlea With the Potential to be an Alternative Therapeutic Target in Hearing Loss. Front Cell Neurosci 2019; 13:532. [PMID: 31866825 PMCID: PMC6908467 DOI: 10.3389/fncel.2019.00532] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 11/15/2019] [Indexed: 12/31/2022] Open
Abstract
Cochlear fibrocytes are a homeostatic supporting cell type embedded in the vascularized extracellular matrix of the spiral ligament, within the lateral wall. Here, they participate in the connective tissue syncytium that enables potassium recirculation into the scala media to take place and ensures development of the endolymphatic potential that helps drive current into hair cells during acoustic stimulation. They have also been implicated in inflammatory responses in the cochlea. Some fibrocytes interact closely with the capillaries of the vasculature in a way which suggests potential involvement, together with the stria vascularis, also in the blood-labyrinth barrier. Several lines of evidence suggests that pathology of the fibrocytes, along with other degenerative changes in this region, contribute to metabolic hearing loss (MHL) during aging that is becoming recognized as distinct from, and potentially a precursor for, sensorineural hearing loss (SNHL). This pathology may underlie a significant proportion of cases of presbycusis. Some evidence points also to an association between fibrocyte degeneration and Ménière’s disease (MD). Fibrocytes are mesenchymal; this characteristic, and their location, make them amenable to potential cell therapy in the form of cell replacement or genetic modification to arrest the process of degeneration that leads to MHL. This review explores the properties and roles of this neglected cell type and suggests potential therapeutic approaches, such as cell transplantation or genetic engineering of fibrocytes, which could be used to prevent this form of presbycusis or provide a therapeutic avenue for MD.
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Affiliation(s)
- David N Furness
- School of Life Sciences, Keele University, Keele, United Kingdom
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Lan X, Sun S, Lan X, Niu L, Zhang C, Chen X, Xia N. Case report: Novel GJB2 variant c.113T>C associated with autosomal recessive non-syndromic hearing loss (ARNSHL) in a Han family. Medicine (Baltimore) 2019; 98:e18253. [PMID: 31852093 PMCID: PMC6922571 DOI: 10.1097/md.0000000000018253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
RATIONALE Molecular mechanism underlying the autosomal recessive non-syndromic hearing loss (ARNSHL) is still plausible. Pathogenic mutations of the gap junction beta 2 protein (GJB2) are reported to be the primary causes of ARNSHL. PATIENT CONCERNS A propositus was diagnosed as ARNSHL with bilateral congenital profound hearing loss. DIAGNOSIS With microarray and target gene sequencing testing methods, a novel GJB2 mutant was found to be associated with ARNSHL in this Han Chinese family. INTERVENTIONS/OUTCOMES Based on the finding in this research, prenatal screening of GJB2 mutation and genetic counseling are recommended to this family for their next pregnancy. Our interventions allow the family to plan informatively. LESSONS In this family, we discovered 2 heterozygous carriers of c.113T>C variation in the GJB2 gene. The propositus, who had profound hearing loss, had inherited the c.113T>C variation from his normal mother and the c.235delC from his father.
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Affiliation(s)
- Xinqiang Lan
- Department of Medical Genetics, Weihai Maternity and Child Care Hospital
- Department of Medical Genetics, Weihai Municipal Second Hospital Affiliated to Qingdao University, Weihai, Shandong Province
| | - Shiyu Sun
- Department of Medical Genetics, Weihai Maternity and Child Care Hospital
- Department of Medical Genetics, Weihai Municipal Second Hospital Affiliated to Qingdao University, Weihai, Shandong Province
| | - Xin Lan
- Medical College, Nanchang University, Nanchang, Jiangxi Province, China
| | - Linyuan Niu
- Department of Medical Genetics, Weihai Maternity and Child Care Hospital
- Department of Medical Genetics, Weihai Municipal Second Hospital Affiliated to Qingdao University, Weihai, Shandong Province
| | - Chunxiao Zhang
- Department of Medical Genetics, Weihai Maternity and Child Care Hospital
- Department of Medical Genetics, Weihai Municipal Second Hospital Affiliated to Qingdao University, Weihai, Shandong Province
| | - Xiaoli Chen
- Department of Medical Genetics, Weihai Maternity and Child Care Hospital
- Department of Medical Genetics, Weihai Municipal Second Hospital Affiliated to Qingdao University, Weihai, Shandong Province
| | - Ningning Xia
- Department of Medical Genetics, Weihai Maternity and Child Care Hospital
- Department of Medical Genetics, Weihai Municipal Second Hospital Affiliated to Qingdao University, Weihai, Shandong Province
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Wu X, Zhang W, Li Y, Lin X. Structure and Function of Cochlear Gap Junctions and Implications for the Translation of Cochlear Gene Therapies. Front Cell Neurosci 2019; 13:529. [PMID: 31827424 PMCID: PMC6892400 DOI: 10.3389/fncel.2019.00529] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 11/13/2019] [Indexed: 12/23/2022] Open
Abstract
Connexins (Cxs) are ubiquitous membrane proteins that are found throughout vertebrate organs, acting as building blocks of the gap junctions (GJs) known to play vital roles in the normal function of many organs. Mutations in Cx genes (particularly GJB2, which encodes Cx26) cause approximately half of all cases of congenital hearing loss in newborns. Great progress has been made in understanding GJ function and the molecular mechanisms for the role of Cxs in the cochlea. Data reveal that multiple types of Cxs work together to ensure normal development and function of the cochlea. These findings include many aspects not proposed in the classic K+ recycling theory, such as the formation of normal cochlear morphology (e.g., the opening of the tunnel of Corti), the fine-tuning of the innervation of nerve fibers to the hair cells (HCs), the maturation of the ribbon synapses, and the initiation of the endocochlear potential (EP). New data, especially those collected from targeted modification of major Cx genes in the mouse cochlea, have demonstrated that Cx26 plays an essential role in the postnatal maturation of the cochlea. Studies also show that Cx26 and Cx30 assume very different roles in the EP generation, given that only Cx26 is required for normal hearing. This article will review our current understanding of the molecular structure, cellular distribution, and major functions of cochlear GJs. Potential implications of the knowledge of cochlear GJs on the design and implementation of translational studies of cochlear gene therapies for Cx mutations are also discussed.
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Affiliation(s)
- Xuewen Wu
- Department of Otolaryngology, Head-Neck and Surgery, Xiangya Hospital of Central South University, Changsha, China
- Department of Otolaryngology, Emory University School of Medicine, Atlanta, GA, United States
| | - Wenjuan Zhang
- Department of Otolaryngology, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yihui Li
- Department of Pharmacy, Changsha Hospital of Traditional Medicine, Changsha, China
| | - Xi Lin
- Department of Otolaryngology, Emory University School of Medicine, Atlanta, GA, United States
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Dai P, Huang LH, Wang GJ, Gao X, Qu CY, Chen XW, Ma FR, Zhang J, Xing WL, Xi SY, Ma BR, Pan Y, Cheng XH, Duan H, Yuan YY, Zhao LP, Chang L, Gao RZ, Liu HH, Zhang W, Huang SS, Kang DY, Liang W, Zhang K, Jiang H, Guo YL, Zhou Y, Zhang WX, Lyu F, Jin YN, Zhou Z, Lu HL, Zhang X, Liu P, Ke J, Hao JS, Huang HM, Jiang D, Ni X, Long M, Zhang L, Qiao J, Morton CC, Liu XZ, Cheng J, Han DM. Concurrent Hearing and Genetic Screening of 180,469 Neonates with Follow-up in Beijing, China. Am J Hum Genet 2019; 105:803-812. [PMID: 31564438 PMCID: PMC6817518 DOI: 10.1016/j.ajhg.2019.09.003] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 09/04/2019] [Indexed: 02/05/2023] Open
Abstract
Concurrent hearing and genetic screening of newborns is expected to play important roles not only in early detection and diagnosis of congenital deafness, which triggers intervention, but also in predicting late-onset and progressive hearing loss and identifying individuals who are at risk of drug-induced HL. Concurrent hearing and genetic screening in the whole newborn population in Beijing was launched in January 2012. This study included 180,469 infants born in Beijing between April 2013 and March 2014, with last follow-up on February 24, 2018. Hearing screening was performed using transiently evoked otoacoustic emission (TEOAE) and automated auditory brainstem response (AABR). For genetic testing, dried blood spots were collected and nine variants in four genes, GJB2, SLC26A4, mtDNA 12S rRNA, and GJB3, were screened using a DNA microarray platform. Of the 180,469 infants, 1,915 (1.061%) were referred bilaterally or unilaterally for hearing screening; 8,136 (4.508%) were positive for genetic screening (heterozygote, homozygote, or compound heterozygote and mtDNA homoplasmy or heteroplasmy), among whom 7,896 (4.375%) passed hearing screening. Forty (0.022%) infants carried two variants in GJB2 or SLC26A4 (homozygote or compound heterozygote) and 10 of those infants passed newborn hearing screening. In total, 409 (0.227%) infants carried the mtDNA 12S rRNA variant (m.1555A>G or m.1494C>T), and 405 of them passed newborn hearing screening. In this cohort study, 25% of infants with pathogenic combinations of GJB2 or SLC26A4 variants and 99% of infants with an m.1555A>G or m.1494C>T variant passed routine newborn hearing screening, indicating that concurrent screening provides a more comprehensive approach for management of congenital deafness and prevention of ototoxicity.
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Affiliation(s)
- Pu Dai
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Li-Hui Huang
- Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, 100730, P. R. China; Beijing Institute of Otolaryngology, Beijing, 100005, P. R. China; Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, 100005, P. R. China
| | - Guo-Jian Wang
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Xue Gao
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Chun-Yan Qu
- China Rehabilitation Research Center for Hearing and Speech Impairment, A8, Huixinli, Anwai, Chaoyang District, Beijing, 100029, P. R. China
| | - Xiao-Wei Chen
- Department of Otorhinolaryngology Head and Neck Surgery, Peking Union Medical College Hospital, Beijing, 100730, P. R. China
| | - Fu-Rong Ma
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University Third Hospital, Beijing, 100191, P. R. China
| | - Jie Zhang
- Beijing Children's Hospital, Capital Medical University, National Center of Children's Health, Beijing, 100045, P. R. China
| | - Wan-Li Xing
- Department of Biomedical Engineering, Tsinghua University School of Medicine, Beijing, 100084, P. R. China
| | - Shu-Yan Xi
- Beijing Municipal Health Commission, Beijing, 100053, P. R. China
| | - Bin-Rong Ma
- School of Biomedical Engineering, Capital Medical University, Beijing, 100069, P. R. China
| | - Ying Pan
- Department of MCH, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, 100026, P. R. China
| | - Xiao-Hua Cheng
- Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, 100730, P. R. China; Beijing Institute of Otolaryngology, Beijing, 100005, P. R. China; Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, 100005, P. R. China
| | - Hong Duan
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Yong-Yi Yuan
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Li-Ping Zhao
- Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, 100730, P. R. China; Beijing Institute of Otolaryngology, Beijing, 100005, P. R. China; Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, 100005, P. R. China
| | - Liang Chang
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, 100191, P.R. China; National Clinical Research Center for Obstetrics and Gynecology, Beijing, 100191, P. R. China
| | - Ru-Zhen Gao
- Department of Otorhinolaryngology Head and Neck Surgery, Peking Union Medical College Hospital, Beijing, 100730, P. R. China
| | - Hai-Hong Liu
- Beijing Children's Hospital, Capital Medical University, National Center of Children's Health, Beijing, 100045, P. R. China
| | - Wei Zhang
- Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, 100730, P. R. China; Beijing Institute of Otolaryngology, Beijing, 100005, P. R. China; Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, 100005, P. R. China
| | - Sha-Sha Huang
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Dong-Yang Kang
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Wei Liang
- China Rehabilitation Research Center for Hearing and Speech Impairment, A8, Huixinli, Anwai, Chaoyang District, Beijing, 100029, P. R. China
| | - Ke Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University Third Hospital, Beijing, 100191, P. R. China
| | - Hong Jiang
- Department of Otorhinolaryngology Head and Neck Surgery, Peking Union Medical College Hospital, Beijing, 100730, P. R. China
| | - Yong-Li Guo
- Beijing Children's Hospital, Capital Medical University, National Center of Children's Health, Beijing, 100045, P. R. China
| | - Yi Zhou
- Beijing Children's Hospital, Capital Medical University, National Center of Children's Health, Beijing, 100045, P. R. China
| | - Wan-Xia Zhang
- Department of MCH, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, 100026, P. R. China
| | - Fan Lyu
- Beijing Municipal Health Commission, Beijing, 100053, P. R. China
| | - Ying-Nan Jin
- Beijing Municipal Health Commission, Beijing, 100053, P. R. China
| | - Zhen Zhou
- School of Biomedical Engineering, Capital Medical University, Beijing, 100069, P. R. China
| | - Hong-Li Lu
- CapitalBio Corporation & National Engineering Research Center for Beijing Biochip Technology, Beijing, 102206, P. R. China
| | - Xin Zhang
- Department of Otolaryngology Head and Neck Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, 100853, P. R. China
| | - Ping Liu
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, 100191, P.R. China; National Clinical Research Center for Obstetrics and Gynecology, Beijing, 100191, P. R. China
| | - Jia Ke
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University Third Hospital, Beijing, 100191, P. R. China
| | - Jin-Sheng Hao
- Beijing Children's Hospital, Capital Medical University, National Center of Children's Health, Beijing, 100045, P. R. China
| | - Hai-Meng Huang
- CapitalBio Corporation & National Engineering Research Center for Beijing Biochip Technology, Beijing, 102206, P. R. China
| | - Di Jiang
- CapitalBio Corporation & National Engineering Research Center for Beijing Biochip Technology, Beijing, 102206, P. R. China
| | - Xin Ni
- Beijing Children's Hospital, Capital Medical University, National Center of Children's Health, Beijing, 100045, P. R. China
| | - Mo Long
- China Rehabilitation Research Center for Hearing and Speech Impairment, A8, Huixinli, Anwai, Chaoyang District, Beijing, 100029, P. R. China
| | - Luo Zhang
- Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, 100730, P. R. China; Beijing Institute of Otolaryngology, Beijing, 100005, P. R. China; Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, 100005, P. R. China
| | - Jie Qiao
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, 100191, P.R. China; National Clinical Research Center for Obstetrics and Gynecology, Beijing, 100191, P. R. China
| | - Cynthia Casson Morton
- Department of Obstetrics and Gynecology and of Pathology, Harvard Medical School, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Manchester Center for Audiology and Deafness, School of Health Sciences, University of Manchester, Manchester, M13 9PL, UK
| | - Xue-Zhong Liu
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Jing Cheng
- Department of Biomedical Engineering, Tsinghua University School of Medicine, Beijing, 100084, P. R. China; Center for Precision Medicine, West China Hospital, Sichuan University, Chengdu, 610041, P. R. China.
| | - De-Min Han
- Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, 100730, P. R. China; Key Laboratory of Otolaryngology Head and Neck Surgery, Ministry of Education, Beijing, 100005, P. R. China.
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Wang Y, Liu Q, Huang S, Yuan B. Learning a Structural and Functional Representation for Gene Expressions: To Systematically Dissect Complex Cancer Phenotypes. IEEE/ACM TRANSACTIONS ON COMPUTATIONAL BIOLOGY AND BIOINFORMATICS 2019; 16:1729-1742. [PMID: 28489545 DOI: 10.1109/tcbb.2017.2702161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cancer is a heterogeneous disease, thus one of the central problems is how to dissect the resulting complex phenotypes in terms of their biological building blocks. Computationally, this is to represent and interpret high dimensional observations through a structural and conceptual abstraction into the most influential determinants underlying the problem. The working hypothesis of this report is to consider gene interaction to be largely responsible for the manifestation of complex cancer phenotypes, thus where the representation is to be conceptualized. Here, we report a representation learning strategy combined with regularizations, in which gene expressions are described in terms of a regularized product of meta-genes and their expression levels. The meta-genes are constrained by gene interactions thus representing their original topological contexts. The expression levels are supervised by their conditional dependencies among the observations thus providing a cluster-specific constraint. We obtain both of these structural constraints using a node-based graphical model. Our representation allows the selection of more influential modules, thus implicating their possible roles in neoplastic transformations. We validate our representation strategy by its robust recognitions of various cancer phenotypes comparing with various classical methods. The modules discovered are either shared or specify for different types or stages of human cancers, all of which are consistent with literature and biology.
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Xiang YB, Tang SH, Li HZ, Xu CY, Chen C, Xu YZ, Ding LR, Xu XQ. Mutation analysis of common deafness-causing genes among 506 patients with nonsyndromic hearing loss from Wenzhou city, China. Int J Pediatr Otorhinolaryngol 2019; 122:185-190. [PMID: 31035178 DOI: 10.1016/j.ijporl.2019.04.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 04/16/2019] [Accepted: 04/16/2019] [Indexed: 12/17/2022]
Abstract
OBJECTIVES The frequency and spectrum of mutations in deafness-causing genes differs significantly according to the ethnic population and region under investigation. The molecular etiology of nonsyndromic hearing loss (NSHL) in Wenzhou, China, has not yet been systematically elucidated. To provide accurate genetic testing and counseling in this area, we investigated the molecular etiology of NSHL in a deaf population from Wenzhou. METHODS A total 506 unrelated patients with NSHL were enrolled in this study. Nine hotspot mutations in four major deafness genes were investigated by sequencing (Group I: 187 patients enrolled between 2011 and 2015) or allele-specific PCR-based universal array (Group II: 319 patients enrolled between 2016 and 2017). The investigated genes included GJB2 (c.35delG, c.176_191del16, c.235delC, c.299-300delAT), SLC26A4 (c.2168A > G, c.919-2A > G), mtDNA 12SrRNA (m.1555A > G, m.1494C > T), and GJB3 (c.538C > T). Furthermore, whole coding region sequencing or improved multiplex ligation detection reaction (IMLDR) were performed for patients who carried mono-allelic variants of GJB2 and SLC26A4, in order to detect other mutations among these patients. RESULTS GJB2 mutations were detected in 22.92% (116/506) of the entire cohort and SLC26A4 mutations were found in 6.52% (33/506) of the cohort. GJB3 mutations were detected in 0.79% (4/506) of the cohort. The mutation rate of mitochondrial DNA 12SrRNA in our patients was 17.40% (88/506), including 17.00% (86/506) with the m.1555A > G mutation and 0.40% (2/506) with the m.1494C > T mutation. The allelic frequency of the c.235delC mutation was 14.62% (148/1012), which is significantly higher than that of c.109G > A (33/1012, 3.26%), c.299_300delAT (13/1012, 1.28%), and c.176_191del16 (6/1012, 0.59%). The most common pathogenic mutation of SLC26A4 was the c.919-2A > G mutation (37/1012, 3.66%), followed by c.2168A > G (6/1012, 0.59%), and c.1229C > T (4/1012, 0.40%). Moreover, five rare pathogenic variants of GJB2 and eight rare pathogenic variants of SLC26A4 were identified. CONCLUSION GJB2 is the primary deafness-causing gene in deaf patients from Wenzhou, China; this is consistent with what is observed in most Chinese populations. However, the surprisingly high rate of the m.1555A > G mutation (17.00%) in patients from Wenzhou was significantly higher than in other populations in China. These findings highlight the specificity of the common deafness-causing gene mutation spectrum in the Wenzhou area. This information may be of benefit for genetic counseling and risk assessment for deaf patients from this area.
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Affiliation(s)
- Yan-Bao Xiang
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China.
| | - Shao-Hua Tang
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China; Key Laboratory of Medical Genetic, School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou, China.
| | - Huan-Zheng Li
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China.
| | - Chen-Yang Xu
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China.
| | - Chong Chen
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China.
| | - Yun-Zhi Xu
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China.
| | - Li-Rong Ding
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China; Key Laboratory of Medical Genetic, School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou, China.
| | - Xue-Qin Xu
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China.
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Inner Ear Connexin Channels: Roles in Development and Maintenance of Cochlear Function. Cold Spring Harb Perspect Med 2019; 9:cshperspect.a033233. [PMID: 30181354 DOI: 10.1101/cshperspect.a033233] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Connexin 26 and connexin 30 are the prevailing isoforms in the epithelial and connective tissue gap junction systems of the developing and mature cochlea. The most frequently encountered variants of the genes that encode these connexins, which are transcriptionally coregulated, determine complete loss of protein function and are the predominant cause of prelingual hereditary deafness. Reducing connexin 26 expression by Cre/loxP recombination in the inner ear of adult mice results in a decreased endocochlear potential, increased hearing thresholds, and loss of >90% of outer hair cells, indicating that this connexin is essential for maintenance of cochlear function. In the developing cochlea, connexins are necessary for intercellular calcium signaling activity. Ribbon synapses and basolateral membrane currents fail to mature in inner hair cells of mice that are born with reduced connexin expression, even though hair cells do not express any connexin. In contrast, pannexin 1, an alternative mediator of intercellular signaling, is dispensable for hearing acquisition and auditory function.
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38
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A rapid improved multiplex ligation detection reaction method for the identification of gene mutations in hereditary hearing loss. PLoS One 2019; 14:e0215212. [PMID: 30973918 PMCID: PMC6459514 DOI: 10.1371/journal.pone.0215212] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 03/28/2019] [Indexed: 12/27/2022] Open
Abstract
Hearing loss (HL) is a common sensory disorder. More than half of HL cases can be attributed to genetic causes. There is no effective therapy for genetic HL at present, early diagnosis to reduce the incidence of genetic HL is important for clinical intervention in genetic HL. Previous studies have identified 111 nonsyndromic hearing loss genes. The most frequently mutated genes identified in NSHL patients in China include GJB2, SLC26A4, and the mitochondrial gene MT-RNR1. It is important to develop HL gene panels in Chinese population, which allow for etiologic diagnosis of both SHL and NSHL. In this study, a total of 220 unrelated Han Chinese patients with bilateral progressive SNHL and 50 unrelated healthy controls were performed Single nucleotide polymorphism (SNP) genotyping using an improved multiplex ligation detection reaction (iMLDR) technique, is to simultaneously detect a total of 32 mutations in ten HL genes, covering all currently characterized mutations involved in the etiology of nonsyndromic or syndromic hearing loss in the Chinese population. The 49 positive samples with known mutations were successfully detected using the iMLDR Technique. For 171 SNHL patients, gene variants were found in 57 cases (33.33%), among which, 30 patients carried mutations in GJB2, 14 patients carried mutations in SLC26A4, seven patients carried mutations in GJB3, and six patients carried mutations in MT-RNR1. The molecular etiology of deafness was confirmed in 12.9% (22/171) of patients carried homozygous variants. These results were verified by Sanger sequencing, indicating that the sensitivity and specificity of the iMLDR technique was 100%. We believe that the implementation of this population-specific technology at an efficient clinical level would have great value in HL diagnosis and treatment.
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39
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Hernández-Guerra M, Hadjihambi A, Jalan R. Gap junctions in liver disease: Implications for pathogenesis and therapy. J Hepatol 2019; 70:759-772. [PMID: 30599172 DOI: 10.1016/j.jhep.2018.12.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Revised: 12/03/2018] [Accepted: 12/12/2018] [Indexed: 02/07/2023]
Abstract
In the normal liver, cells interact closely through gap junctions. By providing a pathway for the trafficking of low molecular mass molecules, these channels contribute to tissue homeostasis and maintenance of hepatic function. Thus, dysfunction of gap junctions affects a wide variety of liver processes, such as differentiation, cell death, inflammation and fibrosis. In fact, dysfunctional gap junctions have been implicated, for more than a decade, in cholestatic disease, hepatic cancer and cirrhosis. Additionally, in recent years there is an increasing body of evidence that these channels are also involved in other relevant and prevalent liver pathological processes, such as non-alcoholic fatty liver disease, acute liver injury and portal hypertension. In parallel to these new clinical implications the available data include controversial observations. Thus, a comprehensive overview is required to better understand the functional complexity of these pores. This paper will review the most recent knowledge concerning gap junction dysfunction, with a special focus on the role of these channels in the pathogenesis of relevant clinical entities and on potential therapeutic targets that are amenable to modification by drugs.
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Affiliation(s)
| | | | - Rajiv Jalan
- UCL Institute for Liver and Digestive Health, Royal Free Medical School, London, UK
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40
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Sun L, Liang B, Zhu L, Shen Y, He L. The rise of the genetic counseling profession in China. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2019; 181:170-176. [PMID: 30860676 PMCID: PMC6593421 DOI: 10.1002/ajmg.c.31693] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 02/08/2019] [Accepted: 02/11/2019] [Indexed: 12/18/2022]
Abstract
The rapid development of genetic and genomic technologies has greatly boosted medical genetic researches and clinical services worldwide. Since last century, genetic counseling in the United States has helped individuals and families understand, accept, and cope with their genetic issues. This fledging profession, which is in essence a branch of social work, emerged in China relatively late but has rapidly grown over the last few years. We believe that genetic counseling will continue to play a pivotal role in building communication channels between medical doctors and their patients, the government and the general public, and social organizations and their customers in China. The growth of genetic counseling aims to enable patients and family members to make informed decision which in turn will lead to the reduction of the birth prevalence of severe congenital anomalies and genetic disorders.
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Affiliation(s)
- Liya Sun
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China.,Shanghai Center for Women and Children's Health, Shanghai, China
| | - Bo Liang
- Chinese Board of Genetic Counseling, Shanghai, China
| | - Liping Zhu
- Shanghai Center for Women and Children's Health, Shanghai, China
| | - Yiping Shen
- Maternal and Child Health Hospital, Children's Hospital and Birth Defect Prevention Research Institute of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China.,Shanghai Children's Medical Center, Shanghai Jiao Tong University, Shanghai, China.,Division of Genetics and Genomics, Boston Children's Hospital, Boston, Massachusetts.,Department of Neurology, Harvard Medical School, Boston, Massachusetts
| | - Lin He
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China.,Chinese Board of Genetic Counseling, Shanghai, China.,Shanghai Center for Women and Children's Health, Shanghai, China.,Sanming Project of Medicine in Shenzhen-Brith Defects Prevention Research and Transformation Team (No. SZSM201406007), Baoan Maternal and Child Health Hospital, Jinan University, Shenzhen, 518102, China
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Liu Y, Ye L, Zhu P, Wu J, Tan S, Chen J, Wu C, Zhong Y, Wang Y, Li X, Liu H. Genetic screening involving 101 hot spots for neonates not passing newborn hearing screening and those random recruited in Dongguan. Int J Pediatr Otorhinolaryngol 2019; 117:82-87. [PMID: 30579095 DOI: 10.1016/j.ijporl.2018.11.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 11/05/2018] [Accepted: 11/05/2018] [Indexed: 12/25/2022]
Abstract
In order to investigate essential molecular causes for hearing loss and mutation frequency of deafness-related genes, 1315 newborns who did not pass the Newborn Hearing Screening (NHS) (audio-no-pass) and 1000 random-selected infants were subjected to detection for 101 hotspot mutations in 18 common deafness-related genes. Totally, 23 alleles of 7 deafness genes were detected out. Significant difference (χ2 = 25.320, p = 0.000) existed in causative mutation frequency between audio-no-pass group (81/1315, 6.160%) and random-selected cohort (18/1000, 1.80%). Of the genes detected out, GJB2 gene mutation was with significant difference (χ2 = 75.132, p = 0.000) between audio-no-pass group (417/1315, 31.711%) and random-selected cohort (159/1000, 15.900%); c.109G > A was the most common allele, as well as the only one with significantly different allele frequency (χ2 = 79.327, p = 0.000) between audio-no-pass group (392/1315, 16.84%) and random-selected cohort (140/1000, 7.55%), which suggested c.109G > A mutation was critical for newborns' hearing loss. This study performed detection for such a large scale of deafness-associated genes and for the first time compared mutations between audio-no-pass and random-recruited neonates, which not only provided more reliable DNA diagnosis result for medical practioners and enhanced clinical care for the newborns, but gave more accurate estimation for mutation frequency.
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Affiliation(s)
- Yanhui Liu
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan 523112, Guangdong, China
| | - Lixin Ye
- Neonatal Disease Screening Center of Maternal and Child Health Hospital, Dongguan 523112, Guangdong, China
| | - Pengyuan Zhu
- CapitalBio Genomics Co., Ltd., Dongguan 523808, Guangdong, China
| | - Jingfan Wu
- Faculty of Medical Laboratory Sciences, Guangdong Medical College, Dongguan 523000, Guangdong, China
| | - Shujuan Tan
- Department of ENT, Dongguan Maternal and Children Hospital, Dongguan 523112, Guangdong, China
| | - Jinguo Chen
- Neonatal Disease Screening Center of Maternal and Child Health Hospital, Dongguan 523112, Guangdong, China
| | - Chunqiu Wu
- CapitalBio Genomics Co., Ltd., Dongguan 523808, Guangdong, China
| | - Yuhang Zhong
- Neonatal Disease Screening Center of Maternal and Child Health Hospital, Dongguan 523112, Guangdong, China
| | - Yu Wang
- CapitalBio Genomics Co., Ltd., Dongguan 523808, Guangdong, China
| | - Xiaoxia Li
- Neonatal Disease Screening Center of Maternal and Child Health Hospital, Dongguan 523112, Guangdong, China.
| | - Hailiang Liu
- CapitalBio Genomics Co., Ltd., Dongguan 523808, Guangdong, China; CapitalBio Technology Inc., Beijing 101111, China.
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Carpena NT, Lee MY. Genetic Hearing Loss and Gene Therapy. Genomics Inform 2018; 16:e20. [PMID: 30602081 PMCID: PMC6440668 DOI: 10.5808/gi.2018.16.4.e20] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 12/04/2018] [Indexed: 12/15/2022] Open
Abstract
Genetic hearing loss crosses almost all the categories of hearing loss which includes the following: conductive, sensory, and neural; syndromic and nonsyndromic; congenital, progressive, and adult onset; high-frequency, low-frequency, or mixed frequency; mild or profound; and recessive, dominant, or sex-linked. Genes play a role in almost half of all cases of hearing loss but effective treatment options are very limited. Genetic hearing loss is considered to be extremely genetically heterogeneous. The advancements in genomics have been instrumental to the identification of more than 6,000 causative variants in more than 150 genes causing hearing loss. Identification of genes for hearing impairment provides an increased insight into the normal development and function of cells in the auditory system. These defective genes will ultimately be important therapeutic targets. However, the auditory system is extremely complex which requires tremendous advances in gene therapy including gene vectors, routes of administration, and therapeutic approaches. This review summarizes and discusses recent advances in elucidating the genomics of genetic hearing loss and technologies aimed at developing a gene therapy that may become a treatment option for in the near future.
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Affiliation(s)
- Nathanial T Carpena
- Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine, Cheonan 31116, Korea
| | - Min Young Lee
- Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine, Cheonan 31116, Korea.,Beckman Laser Institute Korea, Dankook University, Cheonan 31116, Korea
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43
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Ming L, Wang Y, Lu W, Sun T. A Mutational Analysis of GJB2, SLC26A4, MT-RNA1, and GJB3 in Children with Nonsyndromic Hearing Loss in the Henan Province of China. Genet Test Mol Biomarkers 2018; 23:51-56. [PMID: 30589569 DOI: 10.1089/gtmb.2018.0146] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Hearing impairment is one of the most common neurosensory disorders afflicting humans. Approximately half of all cases have a genetic etiology. The distribution and frequency of genetic mutations that cause deafness differ significantly by ethnic group and geographic region. METHODS 130 sporadic nonsyndromic hearing loss (NSHL) children from the Henan province were subjected to microarray-based mutation detection. Nine pathogenic mutations were detected in four of the most common deafness-related genes (GJB2, GJB3, SLC26A4, and MT-RNA1). RESULTS Fifty percent of the analyzed patients (65/130) were shown to have genetic defects known to be related to deafness. Slightly >30% (41/130) had biallelic pathogenic mutations. One patient had pathogenic mutations in their mitochondrial genes (MT-RNA1); no mutations were detected in the GJB3 gene. Twenty-three (17.69%) patients were carriers of a single mutation in a recessive gene; these findings alone, however, cannot be interpreted as a cause of hearing loss. Utilizing this molecular strategy, we were able to arrive at a conclusive diagnosis for 42 of the NSHL children. CONCLUSION Genetic factors play a major role in sporadic NSHL patients from the Henan province, but it is clear that our screen needs to be expanded to include additional genes and alleles. Screening of potential pathogenic genes is important for patient risk assessment.
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Affiliation(s)
- Liang Ming
- 1 Key Clinical Laboratory of Henan Province, Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University , Zhengzhou, China
| | - Yangxia Wang
- 1 Key Clinical Laboratory of Henan Province, Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University , Zhengzhou, China
| | - Wei Lu
- 2 Department of Otology, The First Affiliated Hospital of Zhengzhou University , Zhengzhou, China
| | - Ting Sun
- 1 Key Clinical Laboratory of Henan Province, Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University , Zhengzhou, China
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Yu H, Liu D, Yang J, Wu Z. Prevalence of mutations in the GJB2, SLC26A4, GJB3, and MT-RNR1 genes in 103 children with sensorineural hearing loss in Shaoxing, China. EAR, NOSE & THROAT JOURNAL 2018; 97:E33-E38. [PMID: 30036422 DOI: 10.1177/014556131809700603] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Mutations in the GJB2, SLC26A4, GJB3, and MT-RNR1 genes are known to be a common cause of hearing loss. However, the frequency of hot-spot mutations and genotype-phenotype correlations in patients with sensorineural hearing loss (SNHL) has been less frequently reported. We conducted a study of 103 children-56 boys and 47 girls, aged 5 months to 9 years (mean: 4.1 yr)-with SNHL who underwent genetic screening for 20 hot-spot mutations of the GJB2, SLC26A4, GJB3, and MT-RNR1 genes. Mutations were detected by multiple-PCR-based MALDI-TOF MS assay. At least one mutated allele was detected in 48 patients (46.6%), and 30 patients (29.1%) carried pathogenic mutations. Among all the detected mutations, the most common were GJB2 c.235delC and SLC26A4 c.919-2A>G, with allele frequencies of 23.8 and 6.8%, respectively. At least one mutant allele of SLC26A4 was detected in the 13 patients who had an enlarged vestibular aqueduct (EVA). Almost half of the children with SNHL carried a common deafness-related mutation, and nearly one-third carried a pathogenic mutation. The mutations in SLC26A4 were prevalent and correlated strongly with EVA.
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Affiliation(s)
- Hong Yu
- Department of Child Care, Shaoxing Maternal and Child Health Care Hospital, 305 East St., Shaoxing, Zhejiang 312000, China.
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45
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Whole-exome sequencing identifies two novel mutations in KCNQ4 in individuals with nonsyndromic hearing loss. Sci Rep 2018; 8:16659. [PMID: 30413759 PMCID: PMC6226507 DOI: 10.1038/s41598-018-34876-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 10/27/2018] [Indexed: 11/09/2022] Open
Abstract
Mutations in potassium voltage-gated channel subfamily Q member 4 (KCNQ4) are etiologically linked to a type of nonsyndromic hearing loss, deafness nonsyndromic autosomal dominant 2 (DFNA2). We performed whole-exome sequencing for 98 families with hearing loss and found mutations in KCNQ4 in five families. In this study, we characterized two novel mutations in KCNQ4: a missense mutation (c.796G>T; p.Asp266Tyr) and an in-frame deletion mutation (c.259_267del; p.Val87_Asn89del). p.Asp266Tyr located in the channel pore region resulted in early onset and moderate hearing loss, whereas p.Val87_Asn89del located in the N-terminal cytoplasmic region resulted in late onset and high frequency-specific hearing loss. When heterologously expressed in HEK 293 T cells, both mutant proteins did not show defects in protein trafficking to the plasma membrane or in interactions with wild-type (WT) KCNQ4 channels. Patch-clamp analysis demonstrated that both p.Asp266Tyr and p.Val87_Asn89del mutant channels lost conductance and were completely unresponsive to KCNQ activators, such as retigabine, zinc pyrithione, and ML213. Channels assembled from WT-p.Asp266Tyr concatemers, like those from WT-WT concatemers, exhibited conductance and responsiveness to KCNQ activators. However, channels assembled from WT-p.Val87_Asn89del concatemers showed impaired conductance, suggesting that p.Val87_Asn89del caused complete loss-of-function with a strong dominant-negative effect on functional WT channels. Therefore, the main pathological mechanism may be related to loss of K+ channel activity, not defects in trafficking.
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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] [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.
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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
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47
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The forty years of medical genetics in China. J Genet Genomics 2018; 45:569-582. [PMID: 30459119 DOI: 10.1016/j.jgg.2018.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 10/31/2018] [Indexed: 02/06/2023]
Abstract
Medical genetics is the newest cutting-edge discipline that focuses on solving medical problems using genetics knowledge and methods. In China, medical genetics research activities initiated from a poor inner basis but a prosperous outer environment. During the 40 years of reform and opening-up policy, Chinese scientists contributed significantly in the field of medical genetics, garnering considerable attention worldwide. In this review, we highlight the significant findings and/or results discovered by Chinese scientists in monogenic diseases, complex diseases, cancer, genetic diagnosis, as well as gene manipulation and gene therapy. Due to these achievements, China is widely recognized to be at the forefront of medical genetics research and development. However, the significant progress and development that has been achieved could not have been accomplished without sufficient funding and a well-constructed logistics network. The successful implementation of translational and precise medicine sourced from medical genetics will depend on an open ethics policy and intellectual property protection, along with strong support at the national industry level.
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48
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Dong A, Liu S, Li Y. Gap Junctions in the Nervous System: Probing Functional Connections Using New Imaging Approaches. Front Cell Neurosci 2018; 12:320. [PMID: 30283305 PMCID: PMC6156252 DOI: 10.3389/fncel.2018.00320] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 09/03/2018] [Indexed: 11/13/2022] Open
Abstract
Gap junctions are channels that physically connect adjacent cells, mediating the rapid exchange of small molecules, and playing an essential role in a wide range of physiological processes in nearly every system in the body, including the nervous system. Thus, altered function of gap junctions has been linked with a plethora of diseases and pathological conditions. Being able to measure and characterize the distribution, function, and regulation of gap junctions in intact tissue is therefore essential for understanding the physiological and pathophysiological roles that gap junctions play. In recent decades, several robust in vitro and in vivo methods have been developed for detecting and characterizing gap junctions. Here, we review the currently available methods with respect to invasiveness, signal-to-noise ratio, temporal resolution and others, highlighting the recently developed chemical tracers and hybrid imaging systems that use novel chemical compounds and/or genetically encoded enzymes, transporters, channels, and fluorescent proteins in order to map gap junctions. Finally, we discuss possible avenues for further improving existing techniques in order to achieve highly sensitive, cell type-specific, non-invasive measures of in vivo gap junction function with high throughput and high spatiotemporal resolution.
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Affiliation(s)
- Ao Dong
- State Key Laboratory of Membrane Biology, Peking University School of Life Sciences, Beijing, China.,PKU-IDG/McGovern Institute for Brain Research, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Beijing, China
| | - Simin Liu
- State Key Laboratory of Membrane Biology, Peking University School of Life Sciences, Beijing, China.,PKU-IDG/McGovern Institute for Brain Research, Beijing, China
| | - Yulong Li
- State Key Laboratory of Membrane Biology, Peking University School of Life Sciences, Beijing, China.,PKU-IDG/McGovern Institute for Brain Research, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Beijing, China
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49
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Li W, Sun J, Ling J, Li J, He C, Liu Y, Chen H, Men M, Niu Z, Deng Y, Li M, Li T, Wen J, Sang S, Li H, Wan Z, Richard EM, Chapagain P, Yan D, Liu XZ, Mei L, Feng Y. ELMOD3, a novel causative gene, associated with human autosomal dominant nonsyndromic and progressive hearing loss. Hum Genet 2018; 137:329-342. [PMID: 29713870 DOI: 10.1007/s00439-018-1885-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 04/16/2018] [Indexed: 11/26/2022]
Abstract
Autosomal dominant nonsyndromic hearing loss (ADNSHL) is a highly genetically heterogeneous disorder. Up to date only approximately 37 ADNSHL-causing genes have been identified. The goal of this study was to determine the causative gene in a five-generation Chinese family with ADNSHL. A Chinese family was ascertained. Simultaneously, two affected individuals and one normal hearing control from the family were analyzed by whole exome capture sequencing. To assess the functional effect of the identified variant, in-vitro studies were performed. novel missense variant, c.512A>G (p.His171Arg) in exon 8 of the ELMO domain-containing 3 (ELMOD3) gene, was identified as a causative variant in this family affected by late-onset and progressive ADNSHL. The variant was validated by Sanger sequencing and found to co-segregate with the phenotype within the pedigree and was absent in 500 ethnically matched unrelated normal hearing control subjects. To our knowledge, this is the first report of a family with ADNSHL caused by ELMOD3 mutation. Western blots and immunofluorescence staining demonstrated that p.His171Arg resulted in abnormal expression levels of ELMOD3 and abnormal subcellular localization. Furthermore, the analysis of the stability of the wild-type (WT) and mutant ELMOD3 protein shows that the decay of p.His171Arg is faster than that of the WT, suggesting a shorter halflife of the c.512A > G variant. A novel variant in the ELMOD3 gene, encoding a member of the engulfment and cell motility (ELMO) family of GTPase-activating proteins, was identified for the first time as responsible for ADNSHL.
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Affiliation(s)
- Wu Li
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Jie Sun
- Department of Otolaryngology, The Eight Affiliated Hospital, Sun Yat-sen University, 3025 Shennan Middle Road, Shenzhen, Guangdong, China
| | - Jie Ling
- Institute of Precision Medicine, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
| | - Jiada Li
- Center for Medical Genetics, Central South University, 110 Xiangya Road, Changsha, Hunan, China
- School of Life Sciences, Central South University of China, 110 Xiangya Road, Changsha, Hunan, China
| | - Chufeng He
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Yalan Liu
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Hongsheng Chen
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Meichao Men
- Health Management Center, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
| | - Zhijie Niu
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Yuyuan Deng
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Meng Li
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Taoxi Li
- Center for Medical Genetics, Central South University, 110 Xiangya Road, Changsha, Hunan, China
- School of Life Sciences, Central South University of China, 110 Xiangya Road, Changsha, Hunan, China
| | - Jie Wen
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Shushan Sang
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China
| | - Haibo Li
- Department of Ophthalmology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
| | - Zhengqing Wan
- Center for Medical Genetics, Central South University, 110 Xiangya Road, Changsha, Hunan, China
- School of Life Sciences, Central South University of China, 110 Xiangya Road, Changsha, Hunan, China
| | - Elodie M Richard
- Department of Otorhinolaryngology Head and Neck Surgery, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Prem Chapagain
- Department of Physics, Florida International University, Miami, Florida, USA
- Biomolecular Sciences Institute, Florida International University, Miami, FL, USA
| | - Denise Yan
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, USA
| | - Xue Zhong Liu
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, USA
- Dr. John T. Macdonald Foundation, Department of Human Genetics, University of Miami Miller School of Medicine, Miami, FL, 33136, USA
| | - Lingyun Mei
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China.
| | - Yong Feng
- Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.
- Province Key Laboratory of Otolaryngology Critical Diseases, Changsha, Hunan, China.
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50
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Gao X, Yuan YY, Lin QF, Xu JC, Wang WQ, Qiao YH, Kang DY, Bai D, Xin F, Huang SS, Qiu SW, Guan LP, Su Y, Wang GJ, Han MY, Jiang Y, Liu HK, Dai P. Mutation of IFNLR1, an interferon lambda receptor 1, is associated with autosomal-dominant non-syndromic hearing loss. J Med Genet 2018; 55:298-306. [PMID: 29453195 PMCID: PMC5931241 DOI: 10.1136/jmedgenet-2017-104954] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 11/28/2017] [Accepted: 12/11/2017] [Indexed: 11/04/2022]
Abstract
Background Hereditary sensorineural hearing loss is a genetically heterogeneous disorder. Objectives This study was designed to explore the genetic etiology of deafness in a large Chinese family with autosomal dominant, nonsyndromic, progressive sensorineural hearing loss (ADNSHL). Methods Whole exome sequencing and linkage analysis were performed to identify pathogenic mutation. Inner ear expression of Ifnlr1 was investigated by immunostaining in mice. ifnlr1 Morpholino knockdown Zebrafish were constructed to explore the deafness mechanism. Results We identified a cosegregating heterozygous missense mutation, c.296G>A (p.Arg99His) in the gene encoding interferon lambda receptor 1 (IFNLR1) - a protein that functions in the Jak/ STAT pathway- are associated with ADNSHL Morpholino knockdown of ifnlr1 leads to a significant decrease in hair cells and non-inflation of the swim bladder in late-stage zebrafish, which can be reversed by injection with normal Zebrafish ifnlr1 mRNA. Knockdown of ifnlr1 in zebrafish causes significant upregulation of cytokine receptor family member b4 (interleukin-10r2), jak1, tyrosine kinase 2, stat3, and stat5b in the Jak1/STAT3 pathway at the mRNA level. ConclusionIFNLR1 function is required in the auditory system and that IFNLR1 mutations are associated with ADNSHL. To the best of our knowledge, this is the first study implicating an interferon lambda receptor in auditory function.
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Affiliation(s)
- Xue Gao
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China.,Department of Otolaryngology, The General Hospital of the PLA Rocket Force, Beijing, China
| | - Yong-Yi Yuan
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China
| | - Qiong-Fen Lin
- BGI-Shenzhen, Beishan Industrial Zone, Shenzhen, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | - Jin-Cao Xu
- Department of Otolaryngology, The General Hospital of the PLA Rocket Force, Beijing, China
| | - Wei-Qian Wang
- Department of Otolaryngology, The General Hospital of the PLA Rocket Force, Beijing, China
| | - Yue-Hua Qiao
- Department of Audiology and Balance Science, Xuzhou Medical University, Xuzhou, China
| | - Dong-Yang Kang
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China
| | - Dan Bai
- Department of Otolaryngology, Xi'an Medical College, Xi'an, China
| | - Feng Xin
- Department of Otolaryngology, Head and Neck Surgery, Shanxi Medical University, Taiyuan, China
| | - Sha-Sha Huang
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China
| | - Shi-Wei Qiu
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China.,Department of Audiology and Balance Science, Xuzhou Medical University, Xuzhou, China
| | - Li-Ping Guan
- BGI-Shenzhen, Beishan Industrial Zone, Shenzhen, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | - Yu Su
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China
| | - Guo-Jian Wang
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China
| | - Ming-Yu Han
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China
| | - Yi Jiang
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China.,Department of Otolaryngology, Fujian Medical University ShengLi Clinical College, Fujian Provincial Hospital, Fuzhou, China
| | - Han-Kui Liu
- BGI-Shenzhen, Beishan Industrial Zone, Shenzhen, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | - Pu Dai
- Department of Otolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, China
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