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Kim BJ, Kim Y, Kim JA, Han JH, Kim MY, Yang HK, Rhee CS, Kang YC, Kim CH, Choi BY. Novel Variant of FDXR as a Molecular Etiology of Postlingual Post-synaptic Auditory Neuropathy Spectrum Disorder via Mitochondrial Dysfunction: Reiteration of the Correlation between Genotype and Cochlear Implantation Outcomes. Clin Exp Otorhinolaryngol 2024; 17:206-216. [PMID: 39104018 DOI: 10.21053/ceo.2024.00184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2024] [Accepted: 08/06/2024] [Indexed: 08/07/2024] Open
Abstract
OBJECTIVES FDXR encodes mitochondrial ferredoxin reductase, which is associated with auditory neuropathy spectrum disorder (ANSD) and optic atrophy. To date, only two studies have described FDXR-related hearing loss. The auditory rehabilitation outcomes of this disease entity have not been investigated, and the pathophysiological mechanisms remain incompletely understood. Here we report a hearing-impaired individual with co-segregation of the FDXR variant and post-synaptic type ANSD, who underwent cochlear implantation (CI) with favorable outcomes. We suggest a possible pathophysiological mechanism of adult-onset ANSD involving mitochondrial dysfunction. METHODS A 35-year-old woman was ascertained to have ANSD. Exome sequencing identified the genetic cause of hearing loss, and a functional study measuring mitochondrial activity was performed to provide molecular evidence of pathophysiology. Expression of FDXR in the mouse cochlea was evaluated by immunohistochemistry. Intraoperatively, electrically evoked compound action potential (ECAP) responses were measured, and the mapping parameters were adjusted accordingly. Audiological outcomes were monitored for over 1 year. RESULTS In lymphoblastoid cell lines (LCLs) carrying a novel FDXR variant, decreased ATP levels, reduced mitochondrial membrane potential, and increased reactive oxygen species levels were observed compared to control LCLs. These dysfunctions were restored by administering mitochondria isolated from umbilical cord mesenchymal stem cells, confirming the pathogenic potential of this variant via mitochondrial dysfunction. Partial ECAP responses during CI and FDXR expression in the mouse cochlea indicate that FDXR-related ANSD is post-synaptic. As a result of increasing the pulse width during mapping, the patient's CI outcomes showed significant improvement over 1-year post-CI. CONCLUSION A novel FDXR variant associated with mitochondrial dysfunction and post-synaptic ANSD was first identified in a Korean individual. Additionally, 1-year post-CI outcomes were reported for the first time in the literature. Excellent audiologic. RESULTS were obtained, and our. RESULTS reiterate the correlation between genotype and CI outcomes in ANSD.
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Affiliation(s)
- Bong Jik Kim
- Department of Otorhinolaryngology, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Sejong, Korea
- Brain Research Institute, Chungnam National University College of Medicine, Daejeon, Korea
| | - Yujin Kim
- Paean Biotechnology Inc., Seoul, Korea
| | - Ju Ang Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Min Young Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Hee Kyung Yang
- Department of Ophthalmology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Chae-Seo Rhee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | | | | | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
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Immanneni C, Calame D, Jiao S, Emrick LT, Holmgren M, Yano ST. ATP1A3 Disease Spectrum Includes Paroxysmal Weakness and Encephalopathy Not Triggered by Fever. Neurol Genet 2024; 10:e200150. [PMID: 38685976 PMCID: PMC11057438 DOI: 10.1212/nxg.0000000000200150] [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: 10/20/2023] [Accepted: 02/23/2024] [Indexed: 05/02/2024]
Abstract
Background and Objectives Heterozygous pathogenic variants in ATP1A3, which encodes the catalytic alpha subunit of neuronal Na+/K+-ATPase, cause primarily neurologic disorders with widely variable features that can include episodic movement deficits. One distinctive presentation of ATP1A3-related disease is recurrent fever-triggered encephalopathy. This can occur with generalized weakness and/or ataxia and is described in the literature as relapsing encephalopathy with cerebellar ataxia. This syndrome displays genotype-phenotype correlation with variants at p.R756 causing temperature sensitivity of ATP1A3. We report clinical and in vitro functional evidence for a similar phenotype not triggered by fever but associated with protein loss-of-function. Methods We describe the phenotype of an individual with de novo occurrence of a novel heterozygous ATP1A3 variant, NM_152296.5:c.388_390delGTG; p.(V130del). We confirmed the pathogenicity of p.V130del by cell survival complementation assay in HEK293 cells and then characterized its functional impact on enzymatic ion transport and extracellular sodium binding by two-electrode voltage clamp electrophysiology in Xenopus oocytes. To determine whether variant enzymes reach the cell surface, we surface-biotinylated oocytes expressing N-tagged ATP1A3. Results The proband is a 7-year-old boy who has had 2 lifetime episodes of paroxysmal weakness, encephalopathy, and ataxia not triggered by fever. He had speech regression and intermittent hand tremors after the second episode but otherwise spontaneously recovered after episodes and is at present developmentally appropriate. The p.V130del variant was identified on clinical trio exome sequencing, which did not reveal any other variants possibly associated with the phenotype. p.V130del eliminated ATP1A3 function in cell survival complementation assay. In Xenopus oocytes, p.V130del variant Na+/K+-ATPases showed complete loss of ion transport activity and marked abnormalities of extracellular Na+ binding at room temperature. Despite this clear loss-of-function effect, surface biotinylation under the same conditions revealed that p.V130del variant enzymes were still present at the oocyte's cell membrane. Discussion This individual's phenotype expands the clinical spectrum of ATP1A3-related recurrent encephalopathy to include presentations without fever-triggered events. The total loss of ion transport function with p.V130del, despite enzyme presence at the cell membrane, indicates that haploinsufficiency can cause relatively mild phenotypes in ATP1A3-related disease.
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Affiliation(s)
- Chetan Immanneni
- From the Sam Houston State University College of Osteopathic Medicine (C.I.), Conroe, TX; Molecular Neurophysiology Unit (C.I., S.J., M.H.), National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, MD; Section of Pediatric Neurology and Developmental Neuroscience (D.C.), Department of Pediatrics; Department of Molecular and Human Genetics (D.C., L.T.E.), Baylor College of Medicine; Texas Children's Hospital (D.C.), Houston, TX; National Human Genome Research Institute (S.T.Y.), National Institutes of Health, Bethesda, MD; and Section of Pediatric Neurology (S.T.Y.), Department of Pediatrics, University of Chicago, IL
| | - Daniel Calame
- From the Sam Houston State University College of Osteopathic Medicine (C.I.), Conroe, TX; Molecular Neurophysiology Unit (C.I., S.J., M.H.), National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, MD; Section of Pediatric Neurology and Developmental Neuroscience (D.C.), Department of Pediatrics; Department of Molecular and Human Genetics (D.C., L.T.E.), Baylor College of Medicine; Texas Children's Hospital (D.C.), Houston, TX; National Human Genome Research Institute (S.T.Y.), National Institutes of Health, Bethesda, MD; and Section of Pediatric Neurology (S.T.Y.), Department of Pediatrics, University of Chicago, IL
| | - Song Jiao
- From the Sam Houston State University College of Osteopathic Medicine (C.I.), Conroe, TX; Molecular Neurophysiology Unit (C.I., S.J., M.H.), National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, MD; Section of Pediatric Neurology and Developmental Neuroscience (D.C.), Department of Pediatrics; Department of Molecular and Human Genetics (D.C., L.T.E.), Baylor College of Medicine; Texas Children's Hospital (D.C.), Houston, TX; National Human Genome Research Institute (S.T.Y.), National Institutes of Health, Bethesda, MD; and Section of Pediatric Neurology (S.T.Y.), Department of Pediatrics, University of Chicago, IL
| | - Lisa T Emrick
- From the Sam Houston State University College of Osteopathic Medicine (C.I.), Conroe, TX; Molecular Neurophysiology Unit (C.I., S.J., M.H.), National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, MD; Section of Pediatric Neurology and Developmental Neuroscience (D.C.), Department of Pediatrics; Department of Molecular and Human Genetics (D.C., L.T.E.), Baylor College of Medicine; Texas Children's Hospital (D.C.), Houston, TX; National Human Genome Research Institute (S.T.Y.), National Institutes of Health, Bethesda, MD; and Section of Pediatric Neurology (S.T.Y.), Department of Pediatrics, University of Chicago, IL
| | - Miguel Holmgren
- From the Sam Houston State University College of Osteopathic Medicine (C.I.), Conroe, TX; Molecular Neurophysiology Unit (C.I., S.J., M.H.), National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, MD; Section of Pediatric Neurology and Developmental Neuroscience (D.C.), Department of Pediatrics; Department of Molecular and Human Genetics (D.C., L.T.E.), Baylor College of Medicine; Texas Children's Hospital (D.C.), Houston, TX; National Human Genome Research Institute (S.T.Y.), National Institutes of Health, Bethesda, MD; and Section of Pediatric Neurology (S.T.Y.), Department of Pediatrics, University of Chicago, IL
| | - Sho T Yano
- From the Sam Houston State University College of Osteopathic Medicine (C.I.), Conroe, TX; Molecular Neurophysiology Unit (C.I., S.J., M.H.), National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, MD; Section of Pediatric Neurology and Developmental Neuroscience (D.C.), Department of Pediatrics; Department of Molecular and Human Genetics (D.C., L.T.E.), Baylor College of Medicine; Texas Children's Hospital (D.C.), Houston, TX; National Human Genome Research Institute (S.T.Y.), National Institutes of Health, Bethesda, MD; and Section of Pediatric Neurology (S.T.Y.), Department of Pediatrics, University of Chicago, IL
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Okumura G, Nakamura K, Seyama R, Uchiyama Y, Shinagawa J, Nishio S, Ikeda J, Takayama S, Kodaira M, Kosho T, Takumi Y, Matsumoto N, Sekijima Y. Auditory Neuropathy Spectrum Disorder Progressing with Motor and Sensory Neuropathy Caused by an ATP1A1 Variant. Intern Med 2024; 63:1005-1008. [PMID: 37558483 PMCID: PMC11045389 DOI: 10.2169/internalmedicine.1935-23] [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: 03/08/2023] [Accepted: 07/03/2023] [Indexed: 08/11/2023] Open
Abstract
We encountered a 27-year-old Japanese woman with sensorineural deafness progressing to motor and sensory neuropathy. At 16 years old, she had developed weakness in her lower extremities and hearing impairment, which gradually deteriorated. At 22 years old, combined audiological, electrophysiological, and radiological examination results were consistent with auditory neuropathy spectrum disorder (ANSD). Genetic analyses identified a previously reported missense variant in the ATP1A1 gene (NM_000701.8:c.1799C>G, p.Pro600Arg). Although sensorineural deafness has been reported as a clinical manifestation of ATP1A1-related disorders, our case suggested that ANSD may underlie the pathogenesis of deafness in ATP1A1-related disorders. This case report broadens the genotype-phenotype spectrum of ATP1A1-related disorders.
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Affiliation(s)
- Gaku Okumura
- Department of Medicine (Neurology & Rheumatology), Shinshu University School of Medicine, Japan
| | - Katsuya Nakamura
- Department of Medicine (Neurology & Rheumatology), Shinshu University School of Medicine, Japan
- Center for Medical Genetics, Shinshu University Hospital, Japan
| | - Rie Seyama
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Japan
- Department of Obstetrics and Gynecology, Juntendo University, Japan
| | - Yuri Uchiyama
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Japan
- Department of Rare Disease Genomics, Yokohama City University Hospital, Japan
| | - Jun Shinagawa
- Department of Otorhinolaryngology Head and Neck Surgery, Shinshu University School of Medicine, Japan
| | - Shinya Nishio
- Department of Otorhinolaryngology Head and Neck Surgery, Shinshu University School of Medicine, Japan
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, Japan
| | - Junji Ikeda
- Department of Medicine (Neurology & Rheumatology), Shinshu University School of Medicine, Japan
| | - Shohei Takayama
- Department of Medicine (Neurology & Rheumatology), Shinshu University School of Medicine, Japan
| | - Minori Kodaira
- Department of Medicine (Neurology & Rheumatology), Shinshu University School of Medicine, Japan
| | - Tomoki Kosho
- Center for Medical Genetics, Shinshu University Hospital, Japan
- Department of Medical Genetics, Shinshu University School of Medicine, Japan
| | - Yutaka Takumi
- Department of Otorhinolaryngology Head and Neck Surgery, Shinshu University School of Medicine, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Japan
| | - Yoshiki Sekijima
- Department of Medicine (Neurology & Rheumatology), Shinshu University School of Medicine, Japan
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Qiu Y, Wang H, Pan H, Ding X, Guan J, Zhuang Q, Wu K, Lei Z, Cai H, Dong Y, Zhou H, Lin A, Wang Q, Yan Q. NADH improves AIF dimerization and inhibits apoptosis in iPSCs-derived neurons from patients with auditory neuropathy spectrum disorder. Hear Res 2024; 441:108919. [PMID: 38043402 DOI: 10.1016/j.heares.2023.108919] [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: 09/22/2023] [Revised: 11/08/2023] [Accepted: 11/20/2023] [Indexed: 12/05/2023]
Abstract
Auditory neuropathy spectrum disorder (ANSD) is a hearing impairment involving disruptions to inner hair cells (IHCs), ribbon synapses, spiral ganglion neurons (SGNs), and/or the auditory nerve itself. The outcomes of cochlear implants (CI) for ANSD are variable and dependent on the location of lesion sites. Discovering a potential therapeutic agent for ANSD remains an urgent requirement. Here, 293T stable transfection cell lines and patient induced pluripotent stem cells (iPSCs)-derived auditory neurons carrying the apoptosis inducing factor (AIF) p.R422Q variant were used to pursue a therapeutic regent for ANSD. Nicotinamide adenine dinucleotide (NADH) is a main electron donor in the electron transport chain (ETC). In 293T stable transfection cells with the p.R422Q variant, NADH treatment improved AIF dimerization, rescued mitochondrial dysfunctions, and decreased cell apoptosis. The effects of NADH were further confirmed in patient iPSCs-derived neurons. The relative level of AIF dimers was increased to 150.7 % (P = 0.026) from 59.2 % in patient-neurons upon NADH treatment. Such increased AIF dimerization promoted the mitochondrial import of coiled-coil-helix-coiled-coil-helix domain-containing protein 4 (CHCHD4), which further restored mitochondrial functions. Similarly, the content of mitochondrial calcium (mCa2+) was downregulated from 136.7 % to 102.3 % (P = 0.0024) in patient-neurons upon NADH treatment. Such decreased mCa2+ levels inhibited calpain activity, ultimately reducing the percentage of apoptotic cells from 30.5 % to 21.1 % (P = 0.021). We also compared the therapeutic effects of gene correction and NADH treatment on hereditary ANSD. NADH treatment had comparable restorative effects on functions of ANSD patient-specific cells to that of gene correction. Our findings offer evidence of the molecular mechanisms of ANSD and introduce NADH as a potential therapeutic agent for ANSD therapy.
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Affiliation(s)
- Yue Qiu
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Institute of Brain Science, Wannan Medical College, Wuhu, Anhui 241000, China
| | - Hongyang Wang
- Department of Audiology and Vestibular Medicine, Senior Department of Otolaryngology, Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, the Sixth Medicine Center of Chinese PLA General Hospital, 28 Fuxing Road, Beijing 100853, China
| | - Huaye Pan
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Xue Ding
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jing Guan
- Department of Audiology and Vestibular Medicine, Senior Department of Otolaryngology, Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, the Sixth Medicine Center of Chinese PLA General Hospital, 28 Fuxing Road, Beijing 100853, China
| | - Qianqian Zhuang
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Kaiwen Wu
- Department of Audiology and Vestibular Medicine, Senior Department of Otolaryngology, Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, the Sixth Medicine Center of Chinese PLA General Hospital, 28 Fuxing Road, Beijing 100853, China
| | - Zhaoying Lei
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Huajian Cai
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Yufei Dong
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Hui Zhou
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Aifu Lin
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Qiuju Wang
- Department of Audiology and Vestibular Medicine, Senior Department of Otolaryngology, Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, the Sixth Medicine Center of Chinese PLA General Hospital, 28 Fuxing Road, Beijing 100853, China
| | - Qingfeng Yan
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Department of Pediatrics, The First Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, China; Key Laboratory for Cell and Gene Engineering of Zhejiang Province, Hangzhou, Zhejiang 310058, China.
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Wu J, Chen J, Ding Z, Fan J, Wang Q, Dai P, Han D. Outcomes of cochlear implantation in 75 patients with auditory neuropathy. Front Neurosci 2023; 17:1281884. [PMID: 38027523 PMCID: PMC10679445 DOI: 10.3389/fnins.2023.1281884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 10/27/2023] [Indexed: 12/01/2023] Open
Abstract
Background Cochlear implantation (CI) outcomes in patients with auditory neuropathy (AN) are variable, which hampers patients' decisions on CI. Objective This study aims to assess the outcomes of CI in individuals diagnosed with AN and to examine the various factors that may influence the effectiveness of this intervention. Methods A total of 75 patients diagnosed with AN were included in the study. The hearing threshold, the score of categories of auditory performance (CAP), speech intelligibility rating (SIR), and speech audiometry were tested. Genetic testing was conducted by medical exome sequencing in 46 patients. Results After CI, the average aided hearing threshold for patients with prelingual and post-lingual onset was 38.25 ± 6.63 dB and 32.58 ± 9.26 dB, respectively; CAP score improved to 5.52 ± 1.64 (p < 0.001) and 6.00 ± 0.96 (p < 0.001), respectively; SIR score increased to 3.57 ± 1.22 (p < 0.001) and 4.15 ± 0.95 (p < 0.001), respectively. Maximum speech recognition ranged from 58 to 93% for prelingual onset patients and 43 to 98% for those with post-lingual onset. Speech outcomes of CI in cases with cochlear nerve (CN) deficiency were significantly poorer (p = 0.008). Molecular etiologies, including TWIST1, ACTG1, m.A7445G, and a copy-number variant (CNV) carrying ACTB, were related to AN here. Conclusion CI is a viable therapy option for patients with AN; CN deficiency might impact outcomes of CI.
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Affiliation(s)
| | | | | | | | | | - Pu Dai
- Key Lab of Hearing Impairment Science of Ministry of Education, Key Lab of Hearing Impairment Prevention and Treatment of Beijing, National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, China
| | - Dongyi Han
- Key Lab of Hearing Impairment Science of Ministry of Education, Key Lab of Hearing Impairment Prevention and Treatment of Beijing, National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, China
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Morlet T, O'Reilly R, Pritchett C, Venskytis E, Parkes W. A 15-year Review of 260 Children With Auditory Neuropathy Spectrum Disorder: II. Management and Outcomes. Ear Hear 2023; 44:979-989. [PMID: 37036283 DOI: 10.1097/aud.0000000000001366] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
Abstract
OBJECTIVES Following a review of the demographic and clinical characteristics of all pediatric patients diagnosed with auditory neuropathy spectrum disorder (ANSD) by a pediatric health care system from 2005 to 2020, the present report highlights the type and timing of intervention and outcomes in the same 260 patients with ANSD. DESIGN This was a retrospective study reviewing the demographic data, medical history, imaging studies, audiological and speech language data, type of audiological intervention (hearing aids or cochlear implants), and mode of communication in 260 pediatric patients diagnosed with ANSD over a 15-year period. RESULTS A significant decrease over time in the age at hearing aid fitting was observed. While a similar reduction in the age at implantation occurred over time, cochlear implantation is still rarely performed by 12 months of age in most ANSD patients. Among bilateral ANSD patients fitted with hearing aids, the majority (89.2%) did not benefit from conventional amplification and most received cochlear implants. Some hearing aid benefit for speech and language development was observed in 5.8%, though communication difficulties were persistent and most used a combination of oral and sign language for communication. Only six patients (5%) received significant benefit from their hearing aids for speech and language development. CONCLUSIONS This review of ANSD management over a 15-year period reveals that hearing aids are not a viable option to develop speech and language for most infants and children with ANSD. This finding confirms previous reports and suggest that while hearing aid trials are warranted, children must be tracked closely so as to avoid delays in decision making. Cochlear implantation constitutes the major (if not only) rehabilitative intervention that allows for speech perception in patients who do not benefit from conventional amplification.
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Affiliation(s)
- Thierry Morlet
- Auditory Physiology and Psychoacoustics Research Laboratory, Nemours Children Health, Wilmington, Delaware, USA
- Communication Sciences and Disorders, College of Health Sciences, University of Delaware, Newark, Delaware, USA
- Osborne College of Audiology, Salus University, Elkins Park, Pennsylvania, USA
| | - Robert O'Reilly
- Division of Otolaryngology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Cedric Pritchett
- Department of Otolaryngology, Nemours Children Hospital, Orlando, Florida, USA
| | - Emily Venskytis
- Department of Audiology and Speech-Language Pathology, UPMC Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - William Parkes
- Department of Otolaryngology, Nemours Children Hospital, Wilmington, Delaware, USA
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Keintzel T, Raffelsberger T, Niederwanger L, Gundacker G, Rasse T. Systematic Literature Review and Early Benefit of Cochlear Implantation in Two Pediatric Auditory Neuropathy Cases. J Pers Med 2023; 13:jpm13050848. [PMID: 37241018 DOI: 10.3390/jpm13050848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 04/25/2023] [Accepted: 04/28/2023] [Indexed: 05/28/2023] Open
Abstract
Approximately 1 in 10 children with hearing loss is affected by auditory neuropathy spectrum disorder (ANSD). People who have ANSD usually have great difficulty understanding speech or communicating. However, it is possible for these patients to have audiograms that may indicate profound hearing loss up to normal hearing. This disorder is prognosed with positive, intact or present otoacoustic emissions (OAE) and/or cochlear microphonics (CM) as well as abnormal or absent auditory brainstem responses (ABR). Treatment methods include conventional hearing aids as well as cochlear implants. Cochlear implants (CI) usually promise better speech understanding for ANSD patients. We performed a systematic literature review aiming to show what improvements can effectively be achieved with cochlear implants in children with ANSD and compare this with our experience with two cases of ANSD implanted at our clinic. The retrospective review of two young CI patients diagnosed with ANSD during infancy demonstrated improvements over time in speech development communicated by their parents.
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Affiliation(s)
- Thomas Keintzel
- Department of Otorhinolaryngology, Klinikum Wels-Grieskirchen, 4600 Wels, Austria
| | - Tobias Raffelsberger
- Department of Otorhinolaryngology, Klinikum Wels-Grieskirchen, 4600 Wels, Austria
| | - Lisa Niederwanger
- Department of Otorhinolaryngology, Klinikum Wels-Grieskirchen, 4600 Wels, Austria
| | - Gina Gundacker
- Department Health and Rehabilitation Engineering, University of Applied Sciences Technikum Wien, 1200 Vienna, Austria
| | - Thomas Rasse
- Department of Otorhinolaryngology, Klinikum Wels-Grieskirchen, 4600 Wels, Austria
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Saidia AR, Ruel J, Bahloul A, Chaix B, Venail F, Wang J. Current Advances in Gene Therapies of Genetic Auditory Neuropathy Spectrum Disorder. J Clin Med 2023; 12:jcm12030738. [PMID: 36769387 PMCID: PMC9918155 DOI: 10.3390/jcm12030738] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 01/11/2023] [Accepted: 01/13/2023] [Indexed: 01/18/2023] Open
Abstract
Auditory neuropathy spectrum disorder (ANSD) refers to a range of hearing impairments characterized by an impaired transmission of sound from the cochlea to the brain. This defect can be due to a lesion or defect in the inner hair cell (IHC), IHC ribbon synapse (e.g., pre-synaptic release of glutamate), postsynaptic terminals of the spiral ganglion neurons, or demyelination and axonal loss within the auditory nerve. To date, the only clinical treatment options for ANSD are hearing aids and cochlear implantation. However, despite the advances in hearing-aid and cochlear-implant technologies, the quality of perceived sound still cannot match that of the normal ear. Recent advanced genetic diagnostics and clinical audiology made it possible to identify the precise site of a lesion and to characterize the specific disease mechanisms of ANSD, thus bringing renewed hope to the treatment or prevention of auditory neurodegeneration. Moreover, genetic routes involving the replacement or corrective editing of mutant sequences or defected genes to repair damaged cells for the future restoration of hearing in deaf people are showing promise. In this review, we provide an update on recent discoveries in the molecular pathophysiology of genetic lesions, auditory synaptopathy and neuropathy, and gene-therapy research towards hearing restoration in rodent models and in clinical trials.
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Affiliation(s)
- Anissa Rym Saidia
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, 34295 Montpellier, France
| | - Jérôme Ruel
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, 34295 Montpellier, France
- Cognitive Neuroscience Laboratory, Aix-Marseille University, CNRS, UMR 7291, 13331 Marseille, France
| | - Amel Bahloul
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, 34295 Montpellier, France
| | - Benjamin Chaix
- Department of ENT and Head and Neck Surgery, University Hospital of Montpellier, 34295 Montpellier, France
| | - Frédéric Venail
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, 34295 Montpellier, France
- Department of ENT and Head and Neck Surgery, University Hospital of Montpellier, 34295 Montpellier, France
| | - Jing Wang
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, 34295 Montpellier, France
- Department of ENT and Head and Neck Surgery, University Hospital of Montpellier, 34295 Montpellier, France
- Correspondence: ; Tel.: +33-499-63-60-48
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Auditory neuropathy: from etiology to management. Curr Opin Otolaryngol Head Neck Surg 2022; 30:332-338. [PMID: 35939320 DOI: 10.1097/moo.0000000000000829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
PURPOSE OF REVIEW Auditory neuropathy is a disorder of auditory dysfunction characterized by the normal function of the outer hair cells and malfunction of the inner hair cells, synapses, postsynapses and/or auditory afferent nervous system. This review summarizes the process of discovery and naming of auditory neuropathy and describes the acquired, associated genetic disorders and management available. RECENT FINDINGS In the last 40 years, auditory neuropathy has undergone a process of discovery, naming and progressive elucidation of its complex pathological mechanisms. Recent studies have revealed numerous acquired and inherited causative factors associated with auditory neuropathy. Studies have analyzed the pathogenic mechanisms of various genes and the outcomes of cochlear implantation. New therapeutic approaches, such as stem cell therapy and gene therapy are the future trends in the treatment of auditory neuropathy. SUMMARY A comprehensive understanding of the pathogenic mechanisms is crucial in illustrating auditory neuropathy and assist in developing future management strategies.
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Li Y, Liu X, Wang C, Su Z, Zhao K, Yang M, Chen S, Zhou L. Molecular and clinical characteristics of ATP1A3-related diseases. Front Neurol 2022; 13:924788. [PMID: 35968298 PMCID: PMC9373902 DOI: 10.3389/fneur.2022.924788] [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: 04/20/2022] [Accepted: 06/27/2022] [Indexed: 11/14/2022] Open
Abstract
Objective With detailed studies of ATP1A3-related diseases, the phenotypic spectrum of ATP1A3 has greatly expanded. This study aimed to potentially identify the mechanisms by which ATP1A3 caused neurological dysfunction by analyzing the clinical features and phenotypes of ATP1A3-related diseases, and exploring the distribution patterns of mutations in the subregions of the ATP1A3 protein, thus providing new and effective therapeutic approaches. Methods Databases of PubMed, Online Mendelian Inheritance in Man, and Human Gene Mutation Database, Wanfang Data, and Embase were searched for case reports of ATP1A3-related diseases. Following case screening, we collected clinical information and genetic testing results of patients, and analyzed the disease characteristics on the clinical phenotype spectrum associated with mutations, genetic characteristics of mutations, and effects of drug therapy. Results We collected 902 clinical cases related to ATP1A3 gene. From the results of previous studies, we further clarified the clinical characteristics of ATP1A3-related diseases, such as alternating hemiplegia of childhood (AHC), rapid-onset dystonia-parkinsonism; cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss syndrome, and relapsing encephalopathy with cerebellar ataxia, frequency of mutations in different phenotypes and their distribution in gene and protein structures, and differences in mutations in different clinical phenotypes. Regarding the efficacy of drug treatment, 80 of the 124 patients with AHC were treated with flunarizine, with an effectiveness rate of ~64.5%. Conclusions Nervous system dysfunction due to mutations of ATP1A3 gene was characterized by a group of genotypic–phenotypic interrelated disease pedigrees with multiple clinical manifestations. The presented results might help guide the diagnosis and treatment of ATP1A3-related diseases and provided new ideas for further exploring the mechanisms of nervous system diseases due to ATP1A3 mutations.
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Affiliation(s)
- Yinchao Li
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Xianyue Liu
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Chengzhe Wang
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
- Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zhengwei Su
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Ke Zhao
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Man Yang
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Shuda Chen
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
- *Correspondence: Shuda Chen
| | - Liemin Zhou
- Department of Neurology, The Seven Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
- Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- Liemin Zhou
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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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12
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Kim YS, Kim Y, Jeon HW, Yi N, Lee SY, Kim Y, Han JH, Kim MY, Kim BH, Choi HY, Carandang M, Koo JW, Kim BJ, Bae YJ, Choi BY. Full etiologic spectrum of pediatric severe to profound hearing loss of consecutive 119 cases. Sci Rep 2022; 12:12335. [PMID: 35853923 PMCID: PMC9296524 DOI: 10.1038/s41598-022-16421-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 07/11/2022] [Indexed: 12/03/2022] Open
Abstract
Determining the etiology of severe-to-profound sensorineural hearing loss (SP-SNHL) in pediatric subjects is particularly important in aiding the decision for auditory rehabilitation. We aimed to update the etiologic spectrum of pediatric SP-SNHL by combining internal auditory canal (IAC)-MRI with comprehensive and state-of-the-art genetic testings. From May 2013 to September 2020, 119 cochlear implantees under the age of 15 years with SP-SNHL were all prospectively recruited. They were subjected to genetic tests, including exome sequencing, and IAC-MRI for etiologic diagnosis. Strict interpretation of results were made based on ACMG/AMP guidelines and by an experienced neuroradiologist. The etiology was determined in of 65.5% (78/119) of our cohort. If only one of the two tests was done, the etiologic diagnostic rate would be reduced by at least 21.8%. Notably, cochlear nerve deficiency (n = 20) detected by IAC-MRI topped the etiology list of our cohort, followed by DFNB4 (n = 18), DFNB1 (n = 10), DFNB9 (n = 10) and periventricular leukomalacia associated with congenital CMV infection (n = 8). Simultaneous application of state-of-the-art genetic tests and IAC-MRI is essential for etiologic diagnosis, and if lesions of the auditory nerve or central nerve system are carefully examined on an MRI, we can identify the cause of deafness in more than 65% of pediatric SP-SNHL cases.
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Affiliation(s)
- Young Seok Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea
| | - Yoonjoong Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea
| | - Hyoung Won Jeon
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea
| | - Nayoung Yi
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University Sejong Hospital, Sejong, South Korea
- College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea
| | - Yehree Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea
- College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Min Young Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea
| | - Bo Hye Kim
- College of Medicine, Seoul National University, Seoul, South Korea
| | - Hyeong Yun Choi
- Information Science Major, University of Maryland, College Park, MD, USA
| | - Marge Carandang
- Department of Otorhinolaryngology-Head and Neck Surgery, East Avenue Medical Center, Metro Manila, Philippines
| | - Ja-Won Koo
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea
| | - Bong Jik Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University Sejong Hospital, Sejong, South Korea
- College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Yun Jung Bae
- Department of Radiology, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Kyunggi-do, 463-707, South Korea.
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Savenko IV, Garbaruk ES, Boboshko MY. [The issue of auditory neuropathy: from origins to the present]. Vestn Otorinolaringol 2022; 87:60-69. [PMID: 35274894 DOI: 10.17116/otorino20228701160] [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: 11/17/2022]
Abstract
The issue of auditory neuropathy spectrum disorders (ANSD) has been in a focus of specialists attention for a relatively short time, but during this time a huge amount of scientific and practical knowledge about this hearing disorder has been accumulated. ANSD is a specific auditory deficit caused by dysfunction of periphery part of the auditory system, which may affect the inner hair cells, the spiral ganglion neurons and the auditory nerve, as well as the area of synaptic contact between them, while the outer hair cells, as a rule, remain intact. As a result, a specific condition is formed, in which a patient's otoacoustic emissions and/or cochlear microphonics are present, auditory brainstem responses are abnormal or absent, electrophysiological data may not correlate with hearing level, the discrepancy between pure tone audiometry and speech discrimination is observed. ANSD prevalence, epidemiology, contemporary views on its etiology, including detailed information on hereditary forms of the disorder and its risk factors are considered in the review. The data on the basic rungs of the ANSD pathogenesis, which underlie the development of various forms of the disorder and mainly determine the rehabilitation approach, are presented. The detailed clinical and audiological characteristics of ANSD are presented; contemporary approach to ANSD diagnosis and rehabilitation, including indications for surgical treatment, are considered.
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Affiliation(s)
- I V Savenko
- Pavlov State Medical University, St. Petersburg, Russia
| | - E S Garbaruk
- Pavlov State Medical University, St. Petersburg, Russia.,St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - M Yu Boboshko
- Pavlov State Medical University, St. Petersburg, Russia.,Mechnikov North-Western State Medical University, St. Petersburg, Russia
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14
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Burdo S, Di Berardino F, Bruno G. Is auditory neuropathy an appropriate term? A systematic literature review on its aetiology and pathogenesis. ACTA OTORHINOLARYNGOLOGICA ITALICA 2021; 41:496-506. [PMID: 34825666 PMCID: PMC8686806 DOI: 10.14639/0392-100x-n0932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 05/15/2021] [Indexed: 11/23/2022]
Abstract
To clarify the aetio-pathogenesis of Auditory Neuropathy Spectrum Disorder (ANSD), a total of 845 papers were divided into four categories: Review, Audiology, Treatment and Aetiology. Aetiology was the topic analysed categorising papers as: Genetics, Histopathology, Imaging and Medical diseases. Isolated ANs were in relation to Otoferlin, Pejvakin and DIAPH3 deficiency, and the syndromes were mainly Charcot Marie Tooth, Friedreich Ataxia, mitochondrial disorders and those associated with optic neuropathies. In histopathology papers, important information was available from analyses on human premature newborns and on some syndromic neuropathies. From cochlear dysmorphism to cerebral tumours associated with ANs, these are described in what is identified as the Imaging area. Finally, the prevalent clinical pathology was bilirubinopathy, followed by diabetes. In conclusion, AN/ANSDs do not refer to a clear pathological condition, but to an instrumental pattern without any evidence of auditory nerve involvement, except in a few conditions. The terms AN/ANSD are misleading and should be avoided, including terms such as “synaptopathy” or “dis-synchrony”.
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15
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Wang W, Li J, Lan L, Xie L, Xiong F, Guan J, Wang H, Wang Q. Auditory Neuropathy as the Initial Phenotype for Patients With ATP1A3 c.2452 G > A: Genotype-Phenotype Study and CI Management. Front Cell Dev Biol 2021; 9:749484. [PMID: 34692702 PMCID: PMC8531511 DOI: 10.3389/fcell.2021.749484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 08/31/2021] [Indexed: 01/10/2023] Open
Abstract
Objective: The objective of this study is to analyze the genotype–phenotype correlation of patients with auditory neuropathy (AN), which is a clinical condition featuring normal cochlear responses and abnormal neural responses, and ATP1A3 c.2452 G > A (p.E818K), which has been generally recognized as a genetic cause of cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss (CAPOS) syndrome. Methods: Four patients diagnosed as AN by clinical evaluation and otoacoustic emission and auditory brainstem responses were recruited and analyzed by next-generation sequencing to identify candidate disease-causing variants. Sanger sequencing was performed on the patients and their parents to verify the results, and short tandem repeat-based testing was conducted to confirm the biological relationship between the parents and the patients. Furthermore, cochlear implantation (CI) was performed in one AN patient to reconstruct hearing. Results: Four subjects with AN were identified to share a de novo variant, p.E818K in the ATP1A3 gene. Except for the AN phenotype, patients 1 and 2 exhibited varying degrees of neurological symptoms, implying that they can be diagnosed as CAPOS syndrome. During the 15 years follow-up of patient 1, we observed delayed neurological events and progressive bilateral sensorineural hearing loss in pure tone threshold (pure tone audiometry, PTA). Patient 2 underwent CI on his left ear, and the result was poor. The other two patients (patient 3 and patient 4, who were 8 and 6 years old, respectively) denied any neurological symptoms. Conclusion:ATP1A3 p.E818K has rarely been documented in the Chinese AN population. Our study confirms that p.E818K in the ATP1A3 gene is a multiethnic cause of AN in Chinese individuals. Our study further demonstrates the significance of genetic testing for this specific mutation for identifying the special subtype of AN with somewhat favorable CI outcome and offers a more accurate genetic counseling about the specific de novo mutation.
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Affiliation(s)
- Wenjia Wang
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Jin Li
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Lan Lan
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Linyi Xie
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Fen Xiong
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Jing Guan
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Hongyang Wang
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
| | - Qiuju Wang
- College of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
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Ng HWY, Ogbeta JA, Clapcote SJ. Genetically altered animal models for ATP1A3-related disorders. Dis Model Mech 2021; 14:272403. [PMID: 34612482 PMCID: PMC8503543 DOI: 10.1242/dmm.048938] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Within the past 20 years, particularly with the advent of exome sequencing technologies, autosomal dominant and de novo mutations in the gene encoding the neurone-specific α3 subunit of the Na+,K+-ATPase (NKA α3) pump, ATP1A3, have been identified as the cause of a phenotypic continuum of rare neurological disorders. These allelic disorders of ATP1A3 include (in approximate order of severity/disability and onset in childhood development): polymicrogyria; alternating hemiplegia of childhood; cerebellar ataxia, areflexia, pes cavus, optic atrophy and sensorineural hearing loss syndrome; relapsing encephalopathy with cerebellar ataxia; and rapid-onset dystonia-parkinsonism. Some patients present intermediate, atypical or combined phenotypes. As these disorders are currently difficult to treat, there is an unmet need for more effective therapies. The molecular mechanisms through which mutations in ATP1A3 result in a broad range of neurological symptoms are poorly understood. However, in vivo comparative studies using genetically altered model organisms can provide insight into the biological consequences of the disease-causing mutations in NKA α3. Herein, we review the existing mouse, zebrafish, Drosophila and Caenorhabditis elegans models used to study ATP1A3-related disorders, and discuss their potential contribution towards the understanding of disease mechanisms and development of novel therapeutics.
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Affiliation(s)
- Hannah W Y Ng
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Jennifer A Ogbeta
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Steven J Clapcote
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK.,European Network for Research on Alternating Hemiplegia (ENRAH), 1120 Vienna, Austria
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Kim BJ, Kim YH, Lee S, Han JH, Lee SY, Seong J, Lee DH, Kim B, Park HR, Carandang M, Oh D, Oh SH, Kim JG, Lee S, Choi BY. Otological aspects of NLRP3-related autoinflammatory disorder focusing on the responsiveness to anakinra. Rheumatology (Oxford) 2021; 60:1523-1532. [PMID: 33020839 DOI: 10.1093/rheumatology/keaa511] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 07/06/2020] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Gradually progressive sensorineural hearing loss (SNHL) is a prevalent sensory defect. It is generally untreatable, making rehabilitation by hearing aid or cochlear implantation the only option. However, SNHL as one of the symptoms of the hereditary autoinflammatory systemic disease cryopyrin-associated periodic syndrome, or as the only symptom of the cochlea-specific form (DFNA34), was suggested to respond to IL-1 antagonist (anakinra) therapy, which ameliorates NLRP3 variants-induced over-secretion of IL-1β. We analysed genotypic and phenotypic spectrum of cryopyrin-associated periodic syndrome or DFNA34, specifically focusing on the responsiveness of SNHL to anakinra. METHODS Seventeen families diagnosed with either cryopyrin-associated periodic syndrome or DFNA34 were recruited. Genotyping and phenotyping including audiogram, MRI findings, and in vitro IL-1β assay were performed. RESULTS Our cohort had an etiologic homogeneity of 94.1% to NLRP3 variants and a high de novo occurrence (84.6%). We identified the second DNFA34 pedigree worldwide with a novel NLRP3 variant supported by in vitro analysis. Significant improvement of hearing status against the natural course, showing response to anakinra, was identified in three probands, one of whom used to have severe SNHL. Hearing threshold worse than 60 dB at the start of anakinra and cochlear enhancement on brain MRI seemed to be related with poor audiologic prognosis and responsiveness to anakinra therapy despite stabilized systemic symptoms and inflammatory markers. CONCLUSION We propose a constellation of biomarkers comprising NLRP3 genotypes, hearing status at diagnosis, and cochlear radiological findings as prognostic factors of hearing status after anakinra treatment and possibly as sensitive parameters for treatment dosage adjustment.
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Affiliation(s)
- Bong Jik Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, Korea, Daejeon, Korea.,Brain Research Institute, Chungnam National University College of Medicine, Daejeon, Korea
| | - Young Ho Kim
- Division of Immunology, Department of Pediatrics, Seoul National University Hospital, Seoul, Korea
| | | | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jeon Seong
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Dong-Han Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Bonggi Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, Korea, Daejeon, Korea
| | - Hye-Rim Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Marge Carandang
- Department of Otorhinolaryngology-Head and Neck Surgery, East Avenue Medical Center, Metro Manila, Philippines
| | - Dooyi Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Seung Ha Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Joong Gon Kim
- Division of Immunology, Department of Pediatrics, Seoul National University Hospital, Seoul, Korea
| | - Soyoung Lee
- Division of Immunology, Department of Pediatrics, Seoul National University Hospital, Seoul, Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.,Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Korea
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18
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A nonsense TMEM43 variant leads to disruption of connexin-linked function and autosomal dominant auditory neuropathy spectrum disorder. Proc Natl Acad Sci U S A 2021; 118:2019681118. [PMID: 34050020 PMCID: PMC8179140 DOI: 10.1073/pnas.2019681118] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Genes that are primarily expressed in cochlear glia-like supporting cells (GLSs) have not been clearly associated with progressive deafness. Herein, we present a deafness locus mapped to chromosome 3p25.1 and an auditory neuropathy spectrum disorder (ANSD) gene, TMEM43, mainly expressed in GLSs. We identify p.(Arg372Ter) of TMEM43 by linkage analysis and exome sequencing in two large Asian families segregating ANSD, which is characterized by inability to discriminate speech despite preserved sensitivity to sound. The knock-in mouse with the p.(Arg372Ter) variant recapitulates a progressive hearing loss with histological abnormalities in GLSs. Mechanistically, TMEM43 interacts with the Connexin26 and Connexin30 gap junction channels, disrupting the passive conductance current in GLSs in a dominant-negative fashion when the p.(Arg372Ter) variant is introduced. Based on these mechanistic insights, cochlear implant was performed on three subjects, and speech discrimination was successfully restored. Our study highlights a pathological role of cochlear GLSs by identifying a deafness gene and its causal relationship with ANSD.
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Salles PA, Mata IF, Brünger T, Lal D, Fernandez HH. ATP1A3-Related Disorders: An Ever-Expanding Clinical Spectrum. Front Neurol 2021; 12:637890. [PMID: 33868146 PMCID: PMC8047318 DOI: 10.3389/fneur.2021.637890] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 03/09/2021] [Indexed: 01/29/2023] Open
Abstract
The Na+/K+ ATPases are Sodium-Potassium exchanging pumps, with a heteromeric α-β-γ protein complex. The α3 isoform is required as a rescue pump, after repeated action potentials, with a distribution predominantly in neurons of the central nervous system. This isoform is encoded by the ATP1A3 gene. Pathogenic variants in this gene have been implicated in several phenotypes in the last decades. Carriers of pathogenic variants in this gene manifest neurological and non-neurological features in many combinations, usually with an acute onset and paroxysmal episodes triggered by fever or other factors. The first three syndromes described were: (1) rapid-onset dystonia parkinsonism; (2) alternating hemiplegia of childhood; and, (3) cerebellar ataxia, pes cavus, optic atrophy, and sensorineural hearing loss (CAPOS syndrome). Since their original description, an expanding number of cases presenting with atypical and overlapping features have been reported. Because of this, ATP1A3-disorders are now beginning to be viewed as a phenotypic continuum representing discrete expressions along a broadly heterogeneous clinical spectrum.
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Affiliation(s)
- Philippe A Salles
- Department of Neurology and Center for Neurological Restoration, Neurological Institute, Cleveland Clinic, Cleveland, OH, United States.,Centro de Trastornos del Movimiento, Centro de Trastornos del Movimiento (CETRAM), Santiago, Chile
| | - Ignacio F Mata
- Cleveland Clinic Foundation, Genomic Medicine, Lerner Research Institute, Cleveland, OH, United States
| | - Tobias Brünger
- Cologne Center for Genomics, University Cologne, Cologne, Germany
| | - Dennis Lal
- Cleveland Clinic Foundation, Genomic Medicine, Lerner Research Institute, Cleveland, OH, United States
| | - Hubert H Fernandez
- Department of Neurology and Center for Neurological Restoration, Neurological Institute, Cleveland Clinic, Cleveland, OH, United States
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Jung KS, Hong KW, Jo HY, Choi J, Ban HJ, Cho SB, Chung M. KRGDB: the large-scale variant database of 1722 Koreans based on whole genome sequencing. DATABASE-THE JOURNAL OF BIOLOGICAL DATABASES AND CURATION 2021; 2020:5775747. [PMID: 32133509 PMCID: PMC7056612 DOI: 10.1093/database/baz146] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 12/07/2019] [Accepted: 12/09/2019] [Indexed: 12/16/2022]
Abstract
Since 2012, the Center for Genome Science of the Korea National Institute of Health (KNIH) has been sequencing complete genomes of 1722 Korean individuals. As a result, more than 32 million variant sites have been identified, and a large proportion of the variant sites have been detected for the first time. In this article, we describe the Korean Reference Genome Database (KRGDB) and its genome browser. The current version of our database contains both single nucleotide and short insertion/deletion variants. The DNA samples were obtained from four different origins and sequenced in different sequencing depths (10× coverage of 63 individuals, 20× coverage of 194 individuals, combined 10× and 20× coverage of 135 individuals, 30× coverage of 230 individuals and 30× coverage of 1100 individuals). The major features of the KRGDB are that it contains information on the Korean genomic variant frequency, frequency difference between the Korean and other populations and the variant functional annotation (such as regulatory elements in ENCODE regions and coding variant functions) of the variant sites. Additionally, we performed the genome-wide association study (GWAS) between Korean genome variant sites for the 30×230 individuals and three major common diseases (diabetes, hypertension and metabolic syndrome). The association results are displayed on our browser. The KRGDB uses the MySQL database and Apache-Tomcat web server adopted with Java Server Page (JSP) and is freely available at http://coda.nih.go.kr/coda/KRGDB/index.jsp. Availability: http://coda.nih.go.kr/coda/KRGDB/index.jsp
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Affiliation(s)
- Kwang Su Jung
- Division of Biomedical Informatics, Center for Genome Science, National Institute of Health, KCDC, Cheongju 28159, Republic of Korea
| | - Kyung-Won Hong
- Division of Biomedical Informatics, Center for Genome Science, National Institute of Health, KCDC, Cheongju 28159, Republic of Korea
| | - Hyun Youn Jo
- Division of Biomedical Informatics, Center for Genome Science, National Institute of Health, KCDC, Cheongju 28159, Republic of Korea
| | - Jongpill Choi
- Division of Biomedical Informatics, Center for Genome Science, National Institute of Health, KCDC, Cheongju 28159, Republic of Korea
| | - Hyo-Jeong Ban
- Healthcare R&D Division, Theragen Etex Bio Institute Co. LTD., Suwon 16229, Republic of Korea; Thermo Fisher Scientific Solutions, Seoul 06349, Republic of Korea and Future Medicine Division, Korea Institute of Oriental Medicine, Daejeon 34054, Republic of Korea
| | - Seong Beom Cho
- Division of Biomedical Informatics, Center for Genome Science, National Institute of Health, KCDC, Cheongju 28159, Republic of Korea
| | - Myungguen Chung
- Division of Biomedical Informatics, Center for Genome Science, National Institute of Health, KCDC, Cheongju 28159, Republic of Korea
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21
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Oh DY, Choi BY. Genetic Information and Precision Medicine in Hearing Loss. Clin Exp Otorhinolaryngol 2020; 13:315-317. [PMID: 33176397 PMCID: PMC7669315 DOI: 10.21053/ceo.2020.01606] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 07/30/2020] [Indexed: 12/31/2022] Open
Affiliation(s)
- Doo-Yi Oh
- Department of Otorhinolaryngology, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology, Seoul National University Bundang Hospital, Seongnam, Korea
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Chaudhry D, Chaudhry A, Muzaffar J, Monksfield P, Bance M. Cochlear Implantation Outcomes in Post Synaptic Auditory Neuropathies: A Systematic Review and Narrative Synthesis. J Int Adv Otol 2020; 16:411-431. [PMID: 33136025 DOI: 10.5152/iao.2020.9035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
To establish outcomes following cochlear implantation (CI) in patients with postsynaptic auditory neuropathy (AN). Systematic review and narrative synthesis. Databases searched: MEDLINE, PubMed, EMBASE, Web of Science, Cochrane Collection and ClinicalTrials.gov. No limits placed on language or year of publication. Review conducted in accordance with the PRISMA statement. Searches identified 98 studies in total, of which 14 met the inclusion criteria reporting outcomes in 25 patients with at least 28 CIs. Of these, 4 studies focused on Charcot-Marie-Tooth disease (CMT), 3 on Brown-Vialetto-Van-Laere syndrome (BVVL), 2 on Friedreich Ataxia (FRDA), 2 on Syndromic dominant optic atrophy (DOA+), 2 on Cerebellar ataxia - areflexia - pes cavus - optic atrophy - sensorineural hearing loss (CAPOS) syndrome, and 1 on Deafness-dystonia-optic neuronopathy (DDON) syndrome. All studies were Oxford Centre for Evidence Based Medicine (OCEBM) grade IV. Overall trend was towards good post-CI outcomes with 22 of the total 25 patients displaying modest to significant benefit. Hearing outcomes following CI in postsynaptic ANs are variable but generally good with patients showing improvements in hearing thresholds and speech perception. In the future, development of a clearer stratification system into pre, post, and central AN would have clinical and academic benefits. Further research is required to understand AN pathophysiology and develop better diagnostic tools for more accurate identification of lesion sites. Multicenter longitudinal studies with standardized comprehensive outcome measures including health-related quality of life data will be key in establishing a better understanding of short and long-term post-CI outcomes.
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Affiliation(s)
- Daoud Chaudhry
- University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Bigmingham, UK
| | - Abdullah Chaudhry
- University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Bigmingham, UK
| | - Jameel Muzaffar
- University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Bigmingham, UK
| | - Peter Monksfield
- University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Bigmingham, UK
| | - Manohar Bance
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
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Flexible Real-Time Polymerase Chain Reaction-Based Platforms for Detecting Deafness Mutations in Koreans: A Proposed Guideline for the Etiologic Diagnosis of Auditory Neuropathy Spectrum Disorder. Diagnostics (Basel) 2020; 10:diagnostics10090672. [PMID: 32899707 PMCID: PMC7554951 DOI: 10.3390/diagnostics10090672] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 08/29/2020] [Accepted: 09/01/2020] [Indexed: 01/23/2023] Open
Abstract
Routine application of next-generation sequencing in clinical settings is often limited by time- and cost-prohibitive complex filtering steps. Despite the previously introduced genotyping kit that allows screening of the 11 major recurring variants of sensorineural hearing loss (SNHL) genes in the Korean population, the demand for phenotype- and variant-specific screening kits still remains. Herein, we developed a new real-time PCR-based kit (U-TOP™ HL Genotyping Kit Ver2), comprising six variants from two auditory neuropathy spectrum disorder (ANSD) genes (OTOF and ATP1A3) and five variants from three SNHL genes (MPZL2, COCH, and TMC1), with a distinct auditory phenotype, making this the first genotyping kit dedicated to ANSD. The concordance rate with Sanger sequencing, sensitivity, and specificity of this genotyping kit were all 100%, suggesting reliability. The kit not only allows timely and cost-effective identification of recurring OTOF variants, but it also allows timely detection of cochlear nerve deficiency for those without OTOF variants. Herein, we provide a clinical guideline for an efficient, rapid, and cost-effective etiologic diagnosis of prelingual ANSD. Our study provides a good example of continuing to update new key genetic variants, which will continuously be revealed through NGS, as targets for the newly developed genotyping kit.
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Modiolar Proximity of Slim Modiolar Electrodes and Cochlear Duct Length: Correlation for Potential Basis of Customized Cochlear Implantation With Perimodiolar Electrodes. Ear Hear 2020; 42:323-333. [PMID: 32826506 DOI: 10.1097/aud.0000000000000920] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVES Recent studies have shown that cochlear duct length (CDL) varies among individuals and could significantly influence the final position of the electrode and its trajectory in the cochlea. Given this, we hypothesized that the degree of modiolar proximity of novel slim modiolar electrodes, such as CI532 and CI632, can also be affected by CDL. To test this hypothesis, we retrospectively evaluated individual CDL to determine if there is any significant correlation of CDL with degree of modiolar proximity. METHODS Fifty-one ears from 38 subjects implanted with slim modiolar electrodes by a single surgeon through the round window approach using the pull-back technique were included. Our cohort was classified according to the deafness onset (congenital versus postlingual) and the degree of modiolar proximity (less versus tight) with reference to the spiral diameter made by the slim modiolar electrodes in situ on transorbital x ray. We then analyzed the CDL and its metrics using a readily available surgical preplanning tool (OTOPLAN) to obtain comparable data. RESULTS Among 30 ears associated with congenital deafness, 9 ears (30%) showed less modiolar proximity, while none of the 21 ears from 19 subjects with postlingual deafness exhibited "less modiolar proximity" based on our criteria. In this study, CDL showed significant variation among subjects. Importantly, a significant inverse correlation between spiral diameter and CDL (ρ = -0.581, p < 0.001) was found, showing that shorter CDLs have longer spiral diameter and less modiolar proximity. Moreover, further pull-back technique characterized by pulling out the electrode a little bit more in cases with shorter CDL, if not always, exhibited tighter modiolar proximity. CONCLUSION A preponderance of less modiolar proximity of the electrode was observed exclusively among congenital deafness cases, demonstrated by a less tight spiral configuration even under the pull-back technique. Our data suggest that shorter CDL is associated with a less tight spiral configuration of slim modiolar electrodes postoperatively. Depending on the insertion technique, the differential degree of modiolar proximity of slim modiolar electrodes can be alleviated in cases with short CDL, which justifies cochlear duct length-based customized insertion of slim modiolar electrodes.
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An integrative approach for pediatric auditory neuropathy spectrum disorders: revisiting etiologies and exploring the prognostic utility of auditory steady-state response. Sci Rep 2020; 10:9816. [PMID: 32555439 PMCID: PMC7299968 DOI: 10.1038/s41598-020-66877-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 05/12/2020] [Indexed: 11/22/2022] Open
Abstract
Auditory neuropathy is an important entity in childhood sensorineural hearing loss. Due to diverse etiologies and clinical features, the management is often challenging. This study used an integrative patient-history, audiologic, genetic, and imaging-based approach to investigate the etiologies and audiologic features of 101 children with auditory neuropathy. Etiologically, 48 (47.5%), 16 (15.8%), 11 (10.9%), and 26 (25.7%) children were categorized as having acquired, genetic, cochlear nerve deficiency-related, and indefinite auditory neuropathy, respectively. The most common causes of acquired and genetic auditory neuropathy were prematurity and OTOF mutations, respectively. Patients with acquired auditory neuropathy presented hearing loss earlier (odds ratio, 10.2; 95% confidence interval, 2.2–47.4), whereas patients with genetic auditory neuropathy had higher presence rate of distortion product otoacoustic emissions (odds ratio, 10.7; 95% confidence interval, 1.3–85.4). In patients with different etiologies or pathological sites, moderate to strong correlations (Pearson’s r = 0.51–0.83) were observed between behavioral thresholds and auditory steady-state response thresholds. In conclusion, comprehensive assessments can provide etiological clues in ~75% of the children with auditory neuropathy. Different etiologies are associated with different audiologic features, and auditory steady-state responses might serve as an objective measure for estimating behavioral thresholds.
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26
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Auditory Neuropathy Spectrum Disorders: From Diagnosis to Treatment: Literature Review and Case Reports. J Clin Med 2020; 9:jcm9041074. [PMID: 32290039 PMCID: PMC7230308 DOI: 10.3390/jcm9041074] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/21/2020] [Accepted: 04/01/2020] [Indexed: 12/21/2022] Open
Abstract
Auditory neuropathy spectrum disorder (ANSD) refers to a range of hearing impairments characterized by deteriorated speech perception, despite relatively preserved pure-tone detection thresholds. Affected individuals usually present with abnormal auditory brainstem responses (ABRs), but normal otoacoustic emissions (OAEs). These electrophysiological characteristics have led to the hypothesis that ANSD may be caused by various dysfunctions at the cochlear inner hair cell (IHC) and spiral ganglion neuron (SGN) levels, while the activity of outer hair cells (OHCs) is preserved, resulting in discrepancies between pure-tone and speech comprehension thresholds. The exact prevalence of ANSD remains unknown; clinical findings show a large variability among subjects with hearing impairment ranging from mild to profound hearing loss. A wide range of prenatal and postnatal etiologies have been proposed. The study of genetics and of the implicated sites of lesion correlated with clinical findings have also led to a better understanding of the molecular mechanisms underlying the various forms of ANSD, and may guide clinicians in better screening, assessment and treatment of ANSD patients. Besides OAEs and ABRs, audiological assessment includes stapedial reflex measurements, supraliminal psychoacoustic tests, electrocochleography (ECochG), auditory steady-state responses (ASSRs) and cortical auditory evoked potentials (CAEPs). Hearing aids are indicated in the treatment of ANSD with mild to moderate hearing loss, whereas cochlear implantation is the first choice of treatment in case of profound hearing loss, especially in case of IHC presynaptic disorders, or in case of poor auditory outcomes with conventional hearing aids.
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27
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Lee SY, Shim YJ, Han JH, Song JJ, Koo JW, Oh SH, Lee S, Oh DY, Choi BY. The molecular etiology of deafness and auditory performance in the postlingually deafened cochlear implantees. Sci Rep 2020; 10:5768. [PMID: 32238869 PMCID: PMC7113281 DOI: 10.1038/s41598-020-62647-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 03/02/2020] [Indexed: 11/09/2022] Open
Abstract
Recent advances in molecular genetic testing (MGT) have improved identification of genetic aetiology of candidates for cochlear implantation (CI). However, whether genetic information increases CI outcome predictability in post-lingual deafness remains unclear. Therefore, we evaluated the outcomes of CI with respect to genetic aetiology and clinical predictors by comparing the data of study subjects; those with an identified genetic aetiology (GD group), and those without identifiable variants (GUD group). First, we identified the genetic aetiology in 21 of 40 subjects and also observed genetic etiologic heterogeneity. The GD group demonstrated significantly greater improvement in speech perception scores over a 1-year period than did the GUD group. Further, inverse correlation between deafness duration and the 1-year improvement in speech perception scores was tighter in the GD group than in the GUD group. The weak correlation between deafness duration and CI outcomes in the GUD group might suggest the pathophysiology underlying GUD already significantly involves the cortex, leading to lesser sensitivity to further cortex issues such as deafness duration. Under our MGT protocol, the correlation between deafness duration and CI outcomes were found to rely on the presence of identifiable genetic aetiology, strongly advocating early CI in individual with proven genetic aetiologies.
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Affiliation(s)
- Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Ye Ji Shim
- Department of Otorhinolaryngology-Head and Neck Surgery, Healthcare System Gangnam Center, Seoul National University Hospital, Seoul, South Korea
| | - Jin-Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Jae-Jin Song
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Ja-Won Koo
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Seung Ha Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea
| | - Seungmin Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Doo-Yi Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea.
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Atilgan A, Yuksel M, Ciprut A. Cochlear Implantation in a Case of Auditory Neuropathy Spectrum Disorder with CAPOS Syndrome. Medeni Med J 2019; 34:318-323. [PMID: 32821455 PMCID: PMC7433731 DOI: 10.5222/mmj.2019.53503] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 08/14/2019] [Indexed: 11/29/2022] Open
Abstract
Auditory neuropathy spectrum disorder (ANSD) is a hearing disorder which characterized with normal outer hair cell function but disrupted neural synchrony in the afferent auditory pathway. CAPOS (cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss) syndrome can manifest itself with ANSD and this rare situation and audiological rehabilitation outcomes have not well documented in the literature. We aim to present a cochlear implant user subject with CAPOS syndrome and ANSD. A 14-year-old girl diagnosed with ANSD and CAPOS syndrome. She received unilateral cochlear implant (CI). Her hearing sensitivity and speech perception abilities have been improved with CI. Also, she has a good music perception ability measured with the Turkish version of Clinical Assessment of Music Perception Test. After detailed audiological evaluations, CI could be a good option for patients who have ANSD and CAPOS syndrome.
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Affiliation(s)
- Atılım Atilgan
- Marmara University, Department of Audiology, Istanbul, Turkey
| | - Mustafa Yuksel
- Marmara University, Department of Audiology, İstanbul, Turkey
| | - Ayca Ciprut
- Marmara University, Department of Audiology, İstanbul, Turkey
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29
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Hashimoto A, Kuki I, Fukuoka M, Kim K, Inoue T, Nukui M, Okazaki S, Kawawaki H, Nakamura Y, Saitoh S. Chronological dynamic changes in cortico-subcortical imbalance of cerebral blood flow in a boy with CAPOS syndrome. Brain Dev 2019; 41:625-629. [PMID: 30904181 DOI: 10.1016/j.braindev.2019.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Revised: 02/28/2019] [Accepted: 03/06/2019] [Indexed: 10/27/2022]
Abstract
BACKGROUND Cerebellar ataxia, Areflexia, Pes cavus, Optic atrophy and Sensorineural hearing loss (CAPOS) syndrome is a known ATP1A3-related disorder, but little has been elucidated regarding its pathophysiology. We now report two new patients, a Japanese boy and his mother with a pathogenic mutation (c.2452G>A) in ATP1A3, who were diagnosed with CAPOS syndrome. METHODS After febrile illnesses at 7 months of age, and again at 22 months of age, the boy had a reduced level of consciousness, truncal ataxia and eye movement-disorders. The patient's 32-year-old mother may have experienced an episode of acute encephalopathy in her childhood and sustained sensorineural hearing loss. In the present study, we demonstrated chronological dynamic changes in cerebral blood flow (CBF) in the son, using serial single-photon emission computed tomography (SPECT). RESULTS The serial CBF-SPECT findings using statistical methods showed progressive hyperperfusion in the frontal lobes, basal ganglia and thalamus, and hypoperfusion in the occipital and temporal lobes during the acute and subacute phases. Thereafter, the dynamic changes of CBF improved in the chronic but hypoperfusion in thalamus appeared to the chronic phase. CONCLUSION The abnormal cortico-subcortical CBF may contribute to an acute encephalopathy-like condition in the acute stage of CAPOS syndrome. CAPOS syndrome is not often reported, and is possibly an under-recognized syndrome in clinically mild cases.
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Affiliation(s)
- Aya Hashimoto
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan
| | - Ichiro Kuki
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan.
| | - Masataka Fukuoka
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan
| | - Kiyohiro Kim
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan
| | - Takeshi Inoue
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan
| | - Megumi Nukui
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan
| | - Shin Okazaki
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan
| | - Hisashi Kawawaki
- Department of Pediatric Neurology, Osaka City General Hospital, Osaka, Japan
| | - Yuji Nakamura
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Shinji Saitoh
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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30
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Shearer AE, Hansen MR. Auditory synaptopathy, auditory neuropathy, and cochlear implantation. Laryngoscope Investig Otolaryngol 2019; 4:429-440. [PMID: 31453354 PMCID: PMC6703118 DOI: 10.1002/lio2.288] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 05/17/2019] [Accepted: 06/13/2019] [Indexed: 02/03/2023] Open
Abstract
Cochlear implantation has become the standard-of-care for adults and children with severe to profound hearing loss. There is growing evidence that qualitative as well as quantitative deficits in the auditory nerve may affect cochlear implant (CI) outcomes. Auditory neuropathy spectrum disorder (ANSD) is characterized by dysfunctional transmission of sound from the cochlea to the brain due to defective synaptic function or neural conduction. In this review, we examine the precise mechanisms of genetic lesions causing ANSD and the effect of these lesions on CI outcomes. Reviewed data show that individuals with lesions that primarily affect the cochlear sensory system and the synapse, which are bypassed by the CI, have optimal CI outcomes. Individuals with lesions that affect the auditory nerve show poor performance with CIs, likely because neural transmission of the electrical signal from the CI is affected. We put forth a nuanced molecular classification of ANSD that has implications for preoperative counseling for patients with this disorder prior to cochlear implantation. We propose that description of ANSD patients should be based on the molecular site of lesion typically derived from genetic evaluation (synaptopathy vs. neuropathy) as this has implications for expected CI outcomes. Improvements in our understanding of genetic site of lesions and their effects on CI function should lead to better CI outcomes, not just for individuals with auditory neuropathy, but all individuals with hearing loss.
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Affiliation(s)
- Aiden Eliot Shearer
- Department of Otolaryngology-Head and Neck Surgery University of Iowa Carver College of Medicine Iowa City Iowa U.S.A
| | - Marlan R Hansen
- Department of Otolaryngology-Head and Neck Surgery University of Iowa Carver College of Medicine Iowa City Iowa U.S.A.,Department of Neurosurgery University of Iowa Carver College of Medicine Iowa City Iowa U.S.A
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31
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Abbas L, Rivolta MN. The use of animal models to study cell transplantation in neuropathic hearing loss. Hear Res 2019; 377:72-87. [DOI: 10.1016/j.heares.2019.03.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 03/12/2019] [Accepted: 03/15/2019] [Indexed: 01/29/2023]
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32
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Kim BJ, Kim DK, Han JH, Oh J, Kim AR, Lee C, Kim NK, Park HR, Kim MY, Lee S, Lee S, Oh DY, Park WY, Park S, Choi BY. Clarification of glycosylphosphatidylinositol anchorage of OTOANCORIN and human OTOA variants associated with deafness. Hum Mutat 2019; 40:525-531. [PMID: 30740825 DOI: 10.1002/humu.23719] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 01/23/2019] [Accepted: 02/06/2019] [Indexed: 12/22/2022]
Abstract
Otoancorin (OTOA), encoded by OTOA, is required for the development of the tectorial membrane in the inner ear. Mutations in this gene cause nonsyndromic hearing loss (DFNB22). The molecular mechanisms underlying most DFNB22 remain poorly understood. Disruption of glycosylphosphatidylinositol (GPI) anchorage has been assumed to be the pathophysiology mandating experimental validation. From a Korean deaf family, we identified two trans OTOA variants (c.1320 + 5 G > C and p.Gln589ArgfsX55 [NM_144672.3]) . The pathogenic potential of c.1320 + 5 G > C was confirmed by a minigene splicing assay. To experimentally determine the GPI anchorage, wild-type (WT) and mutant OTOA harboring p.Gln589ArgfsX55 were expressed in HEK293T cells. The mutant OTOA with p.Gln589ArgfsX55 resulted in an uncontrolled release of OTOA into the medium in contrast with phosphatidylinositol-specific phospholipase C-induced controlled release of WT OTOA from the cell surface. Together, the results of this reverse translational study confirmed GPI-anchorage of OTOA and showed that downstream sequences from the 589th amino acid are critical for GPI-anchorage.
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Affiliation(s)
- Bong Jik Kim
- Department of Otolaryngology - Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, South Korea.,Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Dong-Kyu Kim
- Department of Neurobiology and Anatomy, University of Utah School of Medicine, Salt Lake City, Utah
| | - Jin Hee Han
- Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Jayoung Oh
- Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Ah Reum Kim
- Samsung Genome Institute, Samsung Medical Center, Seoul, South Korea
| | - Chung Lee
- Samsung Genome Institute, Samsung Medical Center, Seoul, South Korea
| | - Nayoung Kd Kim
- Samsung Genome Institute, Samsung Medical Center, Seoul, South Korea
| | - Hye-Rim Park
- Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Min Young Kim
- Precision Medicine Center, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Sejoon Lee
- Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Seungmin Lee
- Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Doo Yi Oh
- Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Woong-Yang Park
- Samsung Genome Institute, Samsung Medical Center, Seoul, South Korea.,Department of Molecular Cell Biology, School of Medicine, Sungkyunkwan University, Seoul, South Korea
| | - Sungjin Park
- Department of Neurobiology and Anatomy, University of Utah School of Medicine, Salt Lake City, Utah
| | - Byung Yoon Choi
- Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
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Stenshorne I, Rasmussen M, Salvanos P, Tallaksen CME, Bindoff LA, Koht J. Fever-related ataxia: a case report of CAPOS syndrome. CEREBELLUM & ATAXIAS 2019; 6:2. [PMID: 31410291 PMCID: PMC6368810 DOI: 10.1186/s40673-019-0096-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 01/30/2019] [Indexed: 11/10/2022]
Abstract
Background CAPOS (Cerebellar ataxia, Areflexia, Pes cavus, Optic atrophy and Sensorineural hearing loss) syndrome is caused by the heterozygous mutation, c.2452G > A, in the ATP1A3 gene. Other mutations in this gene can cause a spectrum of overlapping phenotypes including alternating hemiplegia of childhood, rapid onset dystonia parkinsonism, early infantile epileptic encephalopathy and fever induced paroxysmal weakness and encephalopathy. The phenotype is still mistaken for mitochondrial/metabolic disorders and follow up studies are scare. Case presentation We report a 20 year old Norwegian male with ataxia, sensorineural deafness and visual loss. Before the age of five he experienced three fever related episodes of acute neurological deterioration when he temporarily lost his acquired motor skills and developed persistent gait and limb ataxia. In childhood, he developed bilateral optic atrophy and bilateral sensorineural hearing loss. Motor skills improved and at age 20 the patient showed a mild ataxia, hearing loss and reduced vision. A c.2452G > A mutation in the ATP1A3 gene was identified and CAPOS syndrome was confirmed. Conclusions This is the first Norwegian patient reported with CAPOS syndrome. Our patient had a de novo, previously identified ATP1A3 mutation. The combination of recurrent episodes of fever related ataxia, loss of motor skills in early childhood, and early onset hearing and vision loss is typical of CAPOS syndrome. Previous reports suggest a gradual progression of the disease after the initial episodes, while this patient showed a good outcome with improvement of motor skills from adolescence long after the last deterioration episode.
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Affiliation(s)
- Ida Stenshorne
- 1Department of Pediatric and Adolescent Medicine, Drammen Hospital, Vestre Viken Health Trust, Drammen, Norway.,2Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Magnhild Rasmussen
- 3Department of Clinical Neurosciences for Children, Oslo University Hospital, Oslo, Norway
| | - Panagiotis Salvanos
- 4Department of Ophthalmology, Drammen Hospital, Vestre Viken Health Trust, Drammen, Norway
| | - Chantal M E Tallaksen
- 5Department of Neurology, Oslo University Hospital, Oslo, Norway.,2Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Laurence A Bindoff
- 6Department of Clinical Medicine (K1), University of Bergen, Bergen, Norway.,7Department of Neurology, Haukeland University Hospital, 5021 Bergen, Norway
| | - Jeanette Koht
- 8Department of Neurology, Drammen Hospital, Vestre Viken Health Trust, Drammen, Norway.,2Institute of Clinical Medicine, University of Oslo, Oslo, Norway
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Kim BJ, Jang JH, Han JH, Park HR, Oh DY, Lee S, Kim MY, Kim AR, Lee C, Kim NKD, Park WY, Choung YH, Choi BY. Mutational and phenotypic spectrum of OTOF-related auditory neuropathy in Koreans: eliciting reciprocal interaction between bench and clinics. J Transl Med 2018; 16:330. [PMID: 30482216 PMCID: PMC6260760 DOI: 10.1186/s12967-018-1708-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 11/22/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND While auditory neuropathy spectrum disorder (ANSD) is a heterogeneous disorder and its management quite varies depending upon the etiology, even including self-resolution, OTOF is an important molecular etiology of prelingual ANSD and has emerged as an attractive target for implementation of precision medicine in terms of timing and prognosis prediction of auditory rehabilitation. However, to date, the literature is lacking in the genotype-phenotype relationship of this gene as well as efficient molecular testing strategy in the clinic in many populations and to make things more complicated in Koreans, the most prevalent variant p.Arg1939Gln among Korean ANSD children frequently evaded detection by next generation sequencing (NGS), resulting in delayed genetic diagnosis and late cochlear implantation (CI). The aims of this study are to document the mutational and phenotypic spectrum of OTOF-related ANSD (DFNB9) in the Korean population, further establishing genotype-phenotype correlation and proposing a set of the most commonly found OTOF variants to be screened first. METHODS Genetic diagnosis through the NGS-based sequencing was made on patients with ANSD in two tertiary hospitals. Genotype and phenotypes of eleven DFNB9 patients were reviewed. For data analysis, Mann-Whitney test and Fisher's exact test were applied. RESULTS This study disclosed four prevalent variants in Koreans: p.Arg1939Gln with an allele frequency of 40.9%, p.Glu841Lys (13.6%), p.Leu1011Pro and p.Arg1856Trp (9.1%). Three novel variants (c.4227 + 5G > C, p.Gly1845Glu, and p.Pro1931Thr) were identified. Interestingly, a significant association of p.Arg1939Gln with worse ASSR thresholds was observed despite consistently no ABR response. Ten of 11 DFNB9 patients received CI for auditory rehabilitation, showing favorable outcomes with more rapid improvement on early-CI group (age at CI ≤ 18 mo.) than late-CI group. CONCLUSIONS This study included the largest Korean DFNB9 cohort to date and proposed a set of the most frequent four OTOF variants, allowing the potential prioritization of exons during Sanger sequencing. Further, a significant association of p.Arg1939Gln homozygotes with poor residual hearing was observed. We may have to suspect p.Arg1939Gln homozygosity in cases of poor auditory thresholds in ANSD children with putative negative OTOF variants solely screened by NGS. Reciprocal feedback between bench and clinics regarding DFNB9 would complement each other.
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Affiliation(s)
- Bong Jik Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, 35015, Korea.,Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Jeong Hun Jang
- Department of Otorhinolaryngology-Head and Neck Surgery, Ajou University School of Medicine, Suwon, 16499, Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Hye-Rim Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Doo Yi Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Seungmin Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Min Young Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Ah Reum Kim
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea
| | - Chung Lee
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea
| | - Nayoung K D Kim
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea
| | - Woong-Yang Park
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea.,Department of Molecular Cell Biology, School of Medicine, Sungkyunkwan University, Seoul, 06351, Korea
| | - Yun-Hoon Choung
- Department of Otorhinolaryngology-Head and Neck Surgery, Ajou University School of Medicine, Suwon, 16499, Korea.
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea. .,Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, 03080, Korea.
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Roenn CP, Li M, Schack VR, Forster IC, Holm R, Toustrup-Jensen MS, Andersen JP, Petrou S, Vilsen B. Functional consequences of the CAPOS mutation E818K of Na +,K +-ATPase. J Biol Chem 2018; 294:269-280. [PMID: 30409907 DOI: 10.1074/jbc.ra118.004591] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 11/04/2018] [Indexed: 11/06/2022] Open
Abstract
The cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss (CAPOS) syndrome is caused by the single mutation E818K of the α3-isoform of Na+,K+-ATPase. Here, using biochemical and electrophysiological approaches, we examined the functional characteristics of E818K, as well as of E818Q and E818A mutants. We found that these amino acid substitutions reduce the apparent Na+ affinity at the cytoplasmic-facing sites of the pump protein and that this effect is more pronounced for the lysine and glutamine substitutions (3-4-fold) than for the alanine substitution. The electrophysiological measurements indicated a more conspicuous, ∼30-fold reduction of apparent Na+ affinity for the extracellular-facing sites in the CAPOS mutant, which was related to an accelerated transition between the phosphoenzyme intermediates E1P and E2P. The apparent affinity for K+ activation of the ATPase activity was unaffected by these substitutions, suggesting that primarily the Na+-specific site III is affected. Furthermore, the apparent affinities for ATP and vanadate were WT-like in E818K, indicating a normal E1-E2 equilibrium of the dephosphoenzyme. Proton-leak currents were not increased in E818K. However, the CAPOS mutation caused a weaker voltage dependence of the pumping rate and a stronger inhibition by cytoplasmic K+ than the WT enzyme, which together with the reduced Na+ affinity of the cytoplasmic-facing sites precluded proper pump activation under physiological conditions. The functional deficiencies could be traced to the participation of Glu-818 in an intricate hydrogen-bonding/salt-bridge network, connecting it to key residues involved in Na+ interaction at site III.
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Affiliation(s)
- Christian P Roenn
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Melody Li
- Florey Institute of Neuroscience and Mental Health, Parkville, 3052 Victoria, Australia
| | - Vivien R Schack
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Ian C Forster
- Florey Institute of Neuroscience and Mental Health, Parkville, 3052 Victoria, Australia
| | - Rikke Holm
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | | | - Jens P Andersen
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Steven Petrou
- Florey Institute of Neuroscience and Mental Health, Parkville, 3052 Victoria, Australia
| | - Bente Vilsen
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark.
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Wang Y, Lu Y, Cheng J, Zhang L, Han D, Yuan H. Novel OTOF gene mutations identified using a massively parallel DNA sequencing technique in DFNB9 deafness. Acta Otolaryngol 2018; 138:865-870. [PMID: 30073893 DOI: 10.1080/00016489.2018.1476777] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
OBJECTIVES This study examined the causative genes in patients with early-onset hearing loss from two Chinese families. METHOD Massively parallel sequencing, designed to screen all reported genes associated with hearing loss, was performed in a large number of Chinese individuals with hearing loss. This study enrolled patients with the same OTOF mutation and analyzed their phenotype-genotype correlations. RESULTS Three novel OTOF mutations (NM_001287489) [c.1550T > C (p.L517P), c.5900_5902delTCA (p.I1967del), and c.4669_4677delCTGACGGTG (p.L1557-V1559del)] were found to be the cause of hearing loss in five patients. In family AH-890, the affected subject homozygous for p.L517P presented with profound hearing loss, while the affected sisters compound heterozygous for p.L517P and p.I1967del had mild-to-moderate hearing loss. The patient with hearing loss in family SD-345 was found to be compound heterozygous for p.L517P and p.L1557-V1559del. CONCLUSION Three presumably pathogenic mutations in the OTOF gene were detected for the first time, including the first pathogenic mutation detected in the TM domain. In addition to expanding the spectrum of OTOF mutations resulting in DFNB9, our findings present the diversity of its clinical presentation and indicate that MPS is an efficient approach to identify the causative genes associated with hereditary hearing loss.
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Affiliation(s)
- Yanfei Wang
- Department of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
| | - Yu Lu
- Medical Genetics Center, Southwest Hospital, Army Medical University, Chongqing, China
| | - Jing Cheng
- Medical Genetics Center, Southwest Hospital, Army Medical University, Chongqing, China
| | - Lei Zhang
- Medical Genetics Center, Southwest Hospital, Army Medical University, Chongqing, China
| | - Dongyi Han
- Department of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
| | - Huijun Yuan
- Medical Genetics Center, Southwest Hospital, Army Medical University, Chongqing, China
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Hayashida T, Saito Y, Ishii A, Hirose S, Hiraiwa R, Maegaki Y, Ohno K. Further characterization of CAPOS/CAOS syndrome with the Glu818Lys mutation in the ATP1A3 gene: A case report. Brain Dev 2018; 40:576-581. [PMID: 29625811 DOI: 10.1016/j.braindev.2018.03.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/25/2018] [Accepted: 03/15/2018] [Indexed: 12/12/2022]
Abstract
A 38-year-old female patient experienced recurrent episodes of neurological deterioration during febrile illness at the age of 7 and 8 months, and 2, 4, and 37 years. Acute symptoms comprised unconsciousness, headache, abnormal ocular movements, flaccid paralysis with areflexia, ataxia, dysphagia, and movement disorders. Each episode of neurological deterioration was followed by partial recovery with residual symptoms of progressive disturbance of visual acuity with optic atrophy and hearing loss, moderate intellectual disability, strabismus, ophthalmoplegia, as well as fluctuating degree of gait ataxia, chorea, tremor, and myoclonus. In addition, electrocardiography revealed incomplete right bundle branch block. The genetic testing revealed a de novo heterozygous mutation of c.2452G > A (p.Glu818Lys) in the ATP1A3 gene, which was compatible with the clinical phenotype of CAPOS (cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss)/CAOS syndrome. Here we discuss the significance of clinical features of a patient, overlapping with those of alternating hemiplegia of childhood, along with a literature review.
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Affiliation(s)
- Takuya Hayashida
- Division of Child Neurology, Department of Brain and Neurosciences, Faculty of Medicine, Tottori University, Yonago, Japan
| | - Yoshiaki Saito
- Division of Child Neurology, Department of Brain and Neurosciences, Faculty of Medicine, Tottori University, Yonago, Japan.
| | - Atsushi Ishii
- Department of Pediatrics, School of Medicine, Fukuoka University, Fukuoka, Japan
| | - Shinichi Hirose
- Department of Pediatrics, School of Medicine, Fukuoka University, Fukuoka, Japan
| | - Rika Hiraiwa
- Western Shimane Medical and Welfare Center for the Disabled, Gohtsu, Japan
| | - Yoshihiro Maegaki
- Division of Child Neurology, Department of Brain and Neurosciences, Faculty of Medicine, Tottori University, Yonago, Japan
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Chang MY, Lee C, Han JH, Kim MY, Park HR, Kim N, Park WY, Oh DY, Choi BY. Expansion of phenotypic spectrum of MYO15A pathogenic variants to include postlingual onset of progressive partial deafness. BMC MEDICAL GENETICS 2018; 19:29. [PMID: 29482514 PMCID: PMC6389081 DOI: 10.1186/s12881-018-0541-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 02/12/2018] [Indexed: 12/20/2022]
Abstract
BACKGROUND MYO15A variants, except those in the N-terminal domain, have been shown to be associated with congenital or pre-lingual severe-to-profound hearing loss (DFNB3), which ultimately requires cochlear implantation in early childhood. Recently, such variants have also been shown to possibly cause moderate-to-severe hearing loss. Herein, we also demonstrate that some MYO15A mutant alleles can cause postlingual onset of progressive partial deafness. METHODS Two multiplex Korean families (SB246 and SB224), manifesting postlingual, progressive, partial deafness in an autosomal recessive fashion, were recruited. Molecular genetics testing was performed in two different pipelines, in a parallel fashion, for the SB246 family: targeted exome sequencing (TES) of 129 known deafness genes from the proband and whole exome sequencing (WES) of all affected subjects. Only the former pipeline was performed for the SB224 family. Rigorous bioinformatics analyses encompassing structural variations were executed to investigate any causative variants. RESULTS In the SB246 family, two different molecular diagnostic pipelines provided exactly the same candidate variants: c.5504G > A (p.R1835H) in the motor domain and c.10245_10247delCTC (p.S3417del) in the FERM domain of MYO15A. In the SB224 family, c.9790C > T (p.Q3264X) and c.10263C > G (p.I3421M) in the FERM domain were detected as candidate variants. CONCLUSIONS Some recessive MYO15A variants can cause postlingual onset of progressive partial deafness. The phenotypic spectrum of DFNB3 should be extended to include such partial deafness. The mechanism for a milder phenotype could be due to the milder pathogenic potential from hypomorphic alleles of MYO15A or the presence of modifier genes. This merits further investigation.
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Affiliation(s)
- Mun Young Chang
- Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, 102 Heukseok-ro, Dongjak-gu, 06973, Seoul, Republic of Korea
| | - Chung Lee
- Samsung Genome Institute, Samsung Medical Center, 81 Irwon-ro, Gangnam-gu, 06351, Seoul, Republic of Korea.,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, 16419, Suwon, Republic of Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology, Seoul National University Bundang Hospital, 82 Gumi-ro 173 beon-gil, Bundang-gu, 13620, Seongnam, 463-707, Republic of Korea
| | - Min Young Kim
- Department of Otorhinolaryngology, Seoul National University Bundang Hospital, 82 Gumi-ro 173 beon-gil, Bundang-gu, 13620, Seongnam, 463-707, Republic of Korea
| | - Hye-Rim Park
- Department of Otorhinolaryngology, Seoul National University Bundang Hospital, 82 Gumi-ro 173 beon-gil, Bundang-gu, 13620, Seongnam, 463-707, Republic of Korea
| | - Nayoung Kim
- Samsung Genome Institute, Samsung Medical Center, 81 Irwon-ro, Gangnam-gu, 06351, Seoul, Republic of Korea
| | - Woong-Yang Park
- Samsung Genome Institute, Samsung Medical Center, 81 Irwon-ro, Gangnam-gu, 06351, Seoul, Republic of Korea.,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, 16419, Suwon, Republic of Korea.,Department of Molecular Cell Biology, School of Medicine, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, 16419, Suwon, Republic of Korea
| | - Doo Yi Oh
- Department of Otorhinolaryngology, Seoul National University Bundang Hospital, 82 Gumi-ro 173 beon-gil, Bundang-gu, 13620, Seongnam, 463-707, Republic of Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology, Seoul National University Bundang Hospital, 82 Gumi-ro 173 beon-gil, Bundang-gu, 13620, Seongnam, 463-707, Republic of Korea. .,Wide River Institute of Immunology, Seoul National University College of Medicine, 101 Dabyeonbatgil, 25159, Hongcheon, Republic of Korea.
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One-step noninvasive prenatal testing (NIPT) for autosomal recessive homozygous point mutations using digital PCR. Sci Rep 2018; 8:2877. [PMID: 29440752 PMCID: PMC5811538 DOI: 10.1038/s41598-018-21236-w] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 01/31/2018] [Indexed: 12/16/2022] Open
Abstract
Previously, we introduced a noninvasive prenatal testing (NIPT) protocol for diagnosing compound heterozygous autosomal recessive point mutations via maternal plasma DNA and simulated control genomic DNA sampling based on fetal DNA fraction. In our present study, we have improved our NIPT protocol to make it possible to diagnose homozygous autosomal recessive point mutations without the need to acquire fetal DNA fraction. Moreover, chi-squared test and empirical statistical range based on the proportion of mutant allele reads among the total reads served as the gatekeeping method. If this method yielded inconclusive results, then the Bayesian method was performed; final conclusion was drawn from the results of both methods. This protocol was applied to three families co-segregating congenital sensorineural hearing loss with monogenic homozygous mutations in prevalent deafness genes. This protocol successfully predicted the fetal genotypes from all families without the information about fetal DNA fraction using one-step dPCR reactions at least for these three families. Furthermore, we suspect that confirmatory diagnosis under this protocol is possible, not only by using picodroplet dPCR, but also by using the more readily available chip-based dPCR, making our NIPT protocol more useful in the diagnosis of autosomal recessive point mutations in the future.
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