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Isaka Y, Nishio SY, Hishinuma E, Hiratsuka M, Usami SI. Improvement of a Rapid and Highly Sensitive Method for the Diagnosis of the Mitochondrial m.1555A>G Mutation Based on a Single-Stranded Tag Hybridization Chromatographic Printed-Array Strip. Genet Test Mol Biomarkers 2021; 25:79-83. [PMID: 33372830 PMCID: PMC7821431 DOI: 10.1089/gtmb.2020.0105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Aims: Pathogenic variants in mitochondrial DNA are known to be associated with sensorineural hearing loss (SNHL) and aminoglycoside-induced HL. Among them, the m.1555A>G mutation is the most common. Thus, a rapid and easy companion diagnostic method for this mutation would be desirable to prevent HL caused by aminoglycoside therapy. In this study, we report an improved protocol for the single-stranded tag hybridization chromatographic printed-array strip (STH-PAS) method for identifying the m.1555A>G mutation. Methods: To evaluate the accuracy of a novel diagnostic for the m.1555A>G mutation we analyzed 378 DNA samples with or without the m.1555A>G mutation, as determined by Invader assay, and calculated the sensitivity, specificity, and false negative and false positive ratios of this new method. Results: The newly developed protocol was robust; we, obtained the same results using multiple DNA concentrations, differing annealing temperatures, and different polymerase chain reaction thermal cyclers. The diagnostic sensitivity based on the STH-PAS method was 0.99, and the specificity was 1.00. The false negative and false positive ratios were 0 and 0.01, respectively. Conclusion: We improved the genotyping method for m.1555A>G mutations. This assays will be useful as a rapid companion diagnostic before aminoglycoside use.
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Affiliation(s)
- Yuichi Isaka
- Department of Hearing Implant Sciences and Shinshu University School of Medicine, Matsumoto, Japan
| | - Shin-ya Nishio
- Department of Hearing Implant Sciences and Shinshu University School of Medicine, Matsumoto, Japan
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Eiji Hishinuma
- Laboratory of Pharmacotherapy of Life-Style Related Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
- Advanced Research Center for Innovations in Next-Generation Medicine and Tohoku University, Sendai, Japan
- Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan
| | - Masahiro Hiratsuka
- Laboratory of Pharmacotherapy of Life-Style Related Diseases, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
- Advanced Research Center for Innovations in Next-Generation Medicine and Tohoku University, Sendai, Japan
- Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan
| | - Shin-ichi Usami
- Department of Hearing Implant Sciences and Shinshu University School of Medicine, Matsumoto, Japan
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan
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Usami SI, Nishio SY, Moteki H, Miyagawa M, Yoshimura H. Cochlear Implantation From the Perspective of Genetic Background. Anat Rec (Hoboken) 2020; 303:563-593. [PMID: 32027099 PMCID: PMC7064903 DOI: 10.1002/ar.24360] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 12/13/2019] [Indexed: 12/18/2022]
Abstract
While cochlear implantation (CI) technology has greatly improved over the past 40 years, one aspect of CI that continues to pose difficulties is the variability of outcomes due to numerous factors involved in postimplantation performance. The electric acoustic stimulation (EAS) system has expanded indications for CI to include patients with residual hearing, and is currently becoming a standard therapy for these patients. Genetic disorders are known to be the most common cause of congenital/early-onset sensorineural hearing loss, and are also involved in a considerable proportion of cases of late-onset hearing loss. There has been a great deal of progress in the identification of deafness genes over the last two decades. Currently, more than 100 genes have been reported to be associated with non-syndromic hearing loss. Patients possessing a variety of deafness gene mutations have achieved satisfactory auditory performance after CI/EAS, suggesting that identification of the genetic background facilitates prediction of post-CI/EAS performance. When the intra-cochlear etiology is associated with a specific genetic background, there is a potential for good CI performance. Thus, it is essential to determine which region of the cochlea is affected by identifying the responsible genes. This review summarizes the genetic background of the patients receiving CI/EAS, and introduces detailed clinical data and CI/EAS outcomes in representative examples. Anat Rec, 303:563-593, 2020. © 2020 The Authors. The Anatomical Record published by Wiley Periodicals, Inc. on behalf of American Association of Anatomists.
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Affiliation(s)
- Shin-Ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan.,Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
| | - Shin-Ya Nishio
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan.,Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
| | - Hideaki Moteki
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Maiko Miyagawa
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Hidekane Yoshimura
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan.,Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
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Usami SI, Miyagawa M, Nishio SY, Moteki H, Takumi Y, Suzuki M, Kitano Y, Iwasaki S. Patients with CDH23 mutations and the 1555A>G mitochondrial mutation are good candidates for electric acoustic stimulation (EAS). Acta Otolaryngol 2012; 132:377-84. [PMID: 22443853 PMCID: PMC3335139 DOI: 10.3109/00016489.2011.649493] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Conclusions: CDH23 mutations and the 1555A>G mitochondrial mutation were identified among our series of electric acoustic stimulation (EAS) patients, confirming that these genes were important in hearing loss with involvement of high frequency. Successful hearing preservation as well as good outcomes from EAS indicated that patients with this combination of mutations are good candidates for EAS. Objectives: Screening for gene mutations that possibly cause hearing loss involving high frequency was performed to identify the responsible genes in patients with EAS. In addition to a review of the genetic background of the patients with residual hearing loss, the benefit of EAS for patients with particular gene mutations was evaluated. Methods: Eighteen patients (15 late-onset, 3 early-onset) with residual hearing who had received EAS were included in this study. Genetic analysis was performed to identify GJB2, CDH23, SLC26A4, and the 1555 mitochondrial mutations. Results: Three early-onset patients had CDH23 mutations. One late-onset patient had the 1555 A>G mitochondrial mutation.
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Affiliation(s)
- Shin-ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Asahi, Matsumoto, Japan.
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Lu SY, Nishio S, Tsukada K, Oguchi T, Kobayashi K, Abe S, Usami S. Factors that affect hearing level in individuals with the mitochondrial 1555A>G mutation. Clin Genet 2009; 75:480-4. [DOI: 10.1111/j.1399-0004.2008.01138.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Frequency of mitochondrial 12S ribosomal RNA variants in an adult cystic fibrosis population. Pharmacogenet Genomics 2009; 18:1095-102. [PMID: 18830133 DOI: 10.1097/fpc.0b013e328312b072] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In adult cystic fibrosis patient populations, gram-negative bacteria, particularly Pseudomonas aeruginosa, frequently require aggressive therapy including systemic antibiotics, bronchodilators and airway clearance techniques. Aminoglycosides including tobramycin are used frequently to control these chronic airway infections. They, however, cause important nephrotoxic and ototoxic effects that can significantly alter the quality of life. We investigated the genetic predisposition to aminoglycoside ototoxicity in a typical unscreened North American cystic fibrosis population by screening for variants in mitochondrial 12S ribosomal RNA and noted several polymorphisms occurred at higher frequencies than expected and were associated with clinically significant cases of hearing loss. In the population studied, both patients possessing the 1555A>G transition exhibited profound ototoxicity after nontoxic dosing of tobramycin. We also identified new homoplasmic genetic variations in the mitochondrial 12S ribosomal RNA, several of which occurred in highly conserved regions of the gene and were present in patients with moderate-to-severe ototoxicity after exposure to aminoglycosides.
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Usami SI, Wagatsuma M, Fukuoka H, Suzuki H, Tsukada K, Nishio S, Takumi Y, Abe S. The responsible genes in Japanese deafness patients and clinical application using Invader assay. Acta Otolaryngol 2008; 128:446-54. [PMID: 18368581 DOI: 10.1080/00016480701785046] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Discovery of deafness genes has progressed but clinical application lags because of the genetic heterogeneity. To establish clinical application strategy, we reviewed the frequency and spectrum of mutations found in Japanese hearing loss patients and compared them to those in populations of European ancestry. Screening revealed that in Japanese, mutations in GJB2, SLC26A4, and CDH23, and the mitochondrial 12S rRNA are the major causes of hearing loss. Also, mutations in KCNQ4, TECTA, COCH, WFS1, CRYM, COL9A3, and KIAA1199 were found in independent autosomal dominant families. Interestingly, spectrums of GJB2, SLC26A4, and CDH23 mutations in Japanese were quite different from those in Europeans. Simultaneous screening of multiple deafness mutations based on the mutation spectrum of a corresponding population using an Invader panel revealed that approximately 30% of subjects could be diagnosed. This assay will enable us to detect deafness mutations in an efficient and practical manner in the clinical platform. We conclude that specific racial populations may have unique deafness gene epidemiologies; therefore, ethnic background should be considered when genetic testing is performed. Simultaneous examination of multiple mutations based on a population's spectrum may be appropriate and effective for detecting deafness genes, facilitating precise clinical diagnosis, appropriate counseling, and proper management.
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Affiliation(s)
- Shin-Ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Asahi, Matsumoto, Japan.
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Abe S, Yamaguchi T, Usami SI. Application of Deafness Diagnostic Screening Panel Based on Deafness Mutation/Gene Database Using Invader Assay. ACTA ACUST UNITED AC 2007; 11:333-40. [DOI: 10.1089/gte.2007.0002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Satoko Abe
- Division of Advanced Technology and Development, BML, Inc., Kawagoe-shi, Saitama 350-1101, Japan
| | - Toshikazu Yamaguchi
- Division of Advanced Technology and Development, BML, Inc., Kawagoe-shi, Saitama 350-1101, Japan
| | - Shin-Ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto 390-8621, Japan
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Abreu-Silva RS, Lezirovitz K, Braga MCC, Spinelli M, Pirana S, Della-Rosa VA, Otto PA, Mingroni-Netto RC. Prevalence of the A1555G (12S rRNA) and tRNA Ser(UCN) mitochondrial mutations in hearing-impaired Brazilian patients. Braz J Med Biol Res 2006; 39:219-26. [PMID: 16470309 DOI: 10.1590/s0100-879x2006000200008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mitochondrial mutations are responsible for at least 1% of the cases of hereditary deafness, but the contribution of each mutation has not yet been defined in African-derived or native American genetic backgrounds. A total of 203 unselected hearing-impaired patients were screened for the presence of the mitochondrial mutation A1555G in the 12S rRNA gene and mutations in the tRNASer(UCN) gene in order to assess their frequency in the ethnically admixed Brazilian population. We found four individuals with A1555G mutation (2%), which is a frequency similar to those reported for European-derived populations in unselected samples. On the other hand, complete sequencing of the tRNASer(UCN) did not reveal reported pathogenic substitutions, namely A7445G, 7472insC, T7510C, or T7511C. Instead, other rare substitutions were found such as T1291C, A7569G, and G7444A. To evaluate the significance of these findings, 110 "European-Brazilians" and 190 "African-Brazilians" unrelated hearing controls were screened. The T1291C, A7569G and G7444A substitutions were each found in about 1% (2/190) of individuals of African ancestry, suggesting that they are probably polymorphic. Our results indicate that screening for the A1555G mutation is recommended among all Brazilian deaf patients, while testing for mutations in the tRNASer(UCN) gene should be considered only when other frequent deafness-causing mutations have been excluded or in the presence of a maternal transmission pattern.
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Affiliation(s)
- R S Abreu-Silva
- Centro de Estudos do Genoma Humano, Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
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Kobayashi K, Oguchi T, Asamura K, Miyagawa M, Horai S, Abe S, Usami SI. Genetic features, clinical phenotypes, and prevalence of sensorineural hearing loss associated with the 961delT mitochondrial mutation. Auris Nasus Larynx 2005; 32:119-24. [PMID: 15917167 DOI: 10.1016/j.anl.2005.01.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2004] [Revised: 12/06/2004] [Accepted: 01/14/2005] [Indexed: 11/25/2022]
Abstract
To examine the frequency of the 961delT mitochondrial point mutation, considered to be associated with aminoglycoside-induced hearing loss, restriction fragment length polymorphism (RFLP) analysis was performed in (1) 334 unrelated sensorineural hearing loss (SNHL) patients and (2) 56 patients with aminoglycoside antibiotic injection history. Approximately 2% of the SNHL patients had the 961delT mutation, raising the possibility of a relatively high prevalence of this mutation among hearing impaired populations. However, the following findings cast doubt on whether this mutation is truly associated with hearing loss: (1) a similar frequency found in the control subjects, (2) hearing loss that was not segregated within the families, (3) rates of heteroplasmy and aging that were not correlated with the severity of hearing loss, and (4) a low prevalence among the aminoglycoside-induced hearing loss patients (1/56=1.8%). The present analysis did not agree with the concept that the 961delT mutation causes aminoglycoside-induced hearing loss.
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Affiliation(s)
- Katsuhiko Kobayashi
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan
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Abstract
Given the unique biological requirements of sound transduction and the selective advantage conferred upon a species capable of sensitive sound detection, it is not surprising that up to 1% of the approximately 30,000 or more human genes are necessary for hearing. There are hundreds of monogenic disorders for which hearing loss is one manifestation of a syndrome or the only disorder and therefore is nonsyndromic. Herein we review the supporting evidence for identifying over 30 genes for dominantly and recessively inherited, nonsyndromic, sensorineural deafness. The state of knowledge concerning their biological roles is discussed in the context of the controversies within an evolving understanding of the intricate molecular machinery of the inner ear.
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Affiliation(s)
- Thomas B Friedman
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Rockville, Maryland 20850, USA.
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