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Manrique-Huarte R, Garaycochea O, Troconis DP, Pérez-Fernández N, Manrique M. Histopathological reaction in the vestibule after cochlear implantation in Macaca fascicularis. J Neurol Sci 2023; 450:120672. [PMID: 37210936 DOI: 10.1016/j.jns.2023.120672] [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: 01/04/2022] [Revised: 05/02/2023] [Accepted: 05/05/2023] [Indexed: 05/23/2023]
Abstract
Cochlear implantation surgery (CI) is considered a safe procedure and is the standard treatment for the auditory rehabilitation in patients with severe-to-profound sensorineural hearing loss. Although the development of minimally traumatic surgical concepts (MTSC) have enabled the preservation of residual hearing after the implantation, there is scarce literature regarding the vestibular affection following MTCS. The aim of the study is to analyze histopathologic changes in the vestibule after CI in an animal model (Macaca fascicularis). Cochlear implantation was performed successfully in 14 ears following MTCS. They were classified in two groups upon type of electrode array used. Group A (n = 6) with a FLEX 28 electrode array and Group B (n = 8) with HL14 array. A 6-month follow-up was carried out with periodic objective auditory testing. After their sacrifice, histological processing and subsequent analysis was carried out. Intracochlear findings, vestibular presence of fibrosis, obliteration or collapse is analyzed. Saccule and utricle dimensions and neuroepithelium width is measured. Cochlear implantation was performed successfully in all 14 ears through a round window approach. Mean angle of insertion was >270° for group A and 180-270° for group B. In group A auditory deterioration was observed in Mf 1A, Mf2A and Mf5A with histopathological signs of scala tympani ossification, saccule collapse (Mf1A and Mf2A) and cochlear aqueduct obliteration (Mf5A). Besides, signs of endolymphatic sinus dilatation was seen for Mf2B and Mf5A. Regarding group B, no auditory deterioration was observed. Histopathological signs of endolymphatic sinus dilatation were seen in Mf 2B and Mf 8B. In conclusion, the risk of histological damage of the vestibular organs following minimally traumatic surgical concepts and the soft surgery principles is very low. CI surgery is a safe procedure and it can be done preserving the vestibular structures.
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Affiliation(s)
- Raquel Manrique-Huarte
- Department of Otorhinolaryngology, Clinica Universidad de Navarra, University of Navarra, Pamplona, Spain.
| | - Octavio Garaycochea
- Department of Otorhinolaryngology, Clinica Universidad de Navarra, University of Navarra, Pamplona, Spain.
| | - Daniella Parillis Troconis
- Department of Otorhinolaryngology, Clinica Universidad de Navarra, University of Navarra, Pamplona, Spain.
| | - Nicolás Pérez-Fernández
- Department of Otorhinolaryngology, Clinica Universidad de Navarra, University of Navarra, Pamplona, Spain.
| | - Manuel Manrique
- Department of Otorhinolaryngology, Clinica Universidad de Navarra, University of Navarra, Pamplona, Spain.
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Mutai H, Momozawa Y, Kamatani Y, Nakano A, Sakamoto H, Takiguchi T, Nara K, Kubo M, Matsunaga T. Whole exome analysis of patients in Japan with hearing loss reveals high heterogeneity among responsible and novel candidate genes. Orphanet J Rare Dis 2022; 17:114. [PMID: 35248088 PMCID: PMC8898489 DOI: 10.1186/s13023-022-02262-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 02/20/2022] [Indexed: 11/16/2022] Open
Abstract
Background Heterogeneous genetic loci contribute to hereditary hearing loss; more than 100 deafness genes have been identified, and the number is increasing. To detect pathogenic variants in multiple deafness genes, in addition to novel candidate genes associated with hearing loss, whole exome sequencing (WES), followed by analysis prioritizing genes categorized in four tiers, were applied.
Results Trios from families with non-syndromic or syndromic hearing loss (n = 72) were subjected to WES. After segregation analysis and interpretation according to American College of Medical Genetics and Genomics guidelines, candidate pathogenic variants in 11 previously reported deafness genes (STRC, MYO15A, CDH23, PDZD7, PTPN11, SOX10, EYA1, MYO6, OTOF, OTOG, and ZNF335) were identified in 21 families. Discrepancy between pedigree inheritance and genetic inheritance was present in one family. In addition, eight genes (SLC12A2, BAIAP2L2, HKDC1, SVEP1, CACNG1, GTPBP4, PCNX2, and TBC1D8) were screened as single candidate genes in 10 families. Conclusions Our findings demonstrate that four-tier assessment of WES data is efficient and can detect novel candidate genes associated with hearing loss, in addition to pathogenic variants of known deafness genes. Supplementary Information The online version contains supplementary material available at 10.1186/s13023-022-02262-4.
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Moreira A, Croze M, Delehelle F, Cussat-Blanc S, Luga H, Mollereau C, Balaresque P. Hearing Sensitivity of Primates: Recurrent and Episodic Positive Selection in Hair Cells and Stereocilia Protein-Coding Genes. Genome Biol Evol 2021; 13:6302699. [PMID: 34137817 PMCID: PMC8358225 DOI: 10.1093/gbe/evab133] [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] [Accepted: 06/06/2021] [Indexed: 12/29/2022] Open
Abstract
The large spectrum of hearing sensitivity observed in primates results from the impact of environmental and behavioral pressures to optimize sound perception and localization. Although evidence of positive selection in auditory genes has been detected in mammals including in Hominoids, selection has never been investigated in other primates. We analyzed 123 genes highly expressed in the inner ear of 27 primate species and tested to what extent positive selection may have shaped these genes in the order Primates tree. We combined both site and branch-site tests to obtain a comprehensive picture of the positively selected genes (PSGs) involved in hearing sensitivity, and drew a detailed description of the most affected branches in the tree. We chose a conservative approach, and thus focused on confounding factors potentially affecting PSG signals (alignment, GC-biased gene conversion, duplications, heterogeneous sequencing qualities). Using site tests, we showed that around 12% of these genes are PSGs, an α selection value consistent with average human genome estimates (10-15%). Using branch-site tests, we showed that the primate tree is heterogeneously affected by positive selection, with the black snub-nosed monkey, the bushbaby, and the orangutan, being the most impacted branches. A large proportion of these genes is inclined to shape hair cells and stereocilia, which are involved in the mechanotransduction process, known to influence frequency perception. Adaptive selection, and more specifically recurrent adaptive evolution, could have acted in parallel on a set of genes (ADGRV1, USH2A, PCDH15, PTPRQ, and ATP8A2) involved in stereocilia growth and the whole complex of bundle links connecting them, in species across different habitats, including high altitude and nocturnal environments.
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Affiliation(s)
- Andreia Moreira
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France.,Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Myriam Croze
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France
| | - Franklin Delehelle
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France.,Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Sylvain Cussat-Blanc
- Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Hervé Luga
- Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Catherine Mollereau
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France
| | - Patricia Balaresque
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France
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Mutai H, Wasano K, Momozawa Y, Kamatani Y, Miya F, Masuda S, Morimoto N, Nara K, Takahashi S, Tsunoda T, Homma K, Kubo M, Matsunaga T. Variants encoding a restricted carboxy-terminal domain of SLC12A2 cause hereditary hearing loss in humans. PLoS Genet 2020; 16:e1008643. [PMID: 32294086 PMCID: PMC7159186 DOI: 10.1371/journal.pgen.1008643] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Accepted: 01/31/2020] [Indexed: 02/07/2023] Open
Abstract
Hereditary hearing loss is challenging to diagnose because of the heterogeneity of the causative genes. Further, some genes involved in hereditary hearing loss have yet to be identified. Using whole-exome analysis of three families with congenital, severe-to-profound hearing loss, we identified a missense variant of SLC12A2 in five affected members of one family showing a dominant inheritance mode, along with de novo splice-site and missense variants of SLC12A2 in two sporadic cases, as promising candidates associated with hearing loss. Furthermore, we detected another de novo missense variant of SLC12A2 in a sporadic case. SLC12A2 encodes Na+, K+, 2Cl− cotransporter (NKCC) 1 and plays critical roles in the homeostasis of K+-enriched endolymph. Slc12a2-deficient mice have congenital, profound deafness; however, no human variant of SLC12A2 has been reported as associated with hearing loss. All identified SLC12A2 variants mapped to exon 21 or its 3’-splice site. In vitro analysis indicated that the splice-site variant generates an exon 21-skipped SLC12A2 mRNA transcript expressed at much lower levels than the exon 21-included transcript in the cochlea, suggesting a tissue-specific role for the exon 21-encoded region in the carboy-terminal domain. In vitro functional analysis demonstrated that Cl− influx was significantly decreased in all SLC12A2 variants studied. Immunohistochemistry revealed that SLC12A2 is located on the plasma membrane of several types of cells in the cochlea, including the strial marginal cells, which are critical for endolymph homeostasis. Overall, this study suggests that variants affecting exon 21 of the SLC12A2 transcript are responsible for hereditary hearing loss in humans. Sounds are perceived by auditory sensory cells, owing to tissues surrounding them, including the cochlear lateral wall. Part of the cochlear lateral wall, the stria vascularis, is critical for production and maintenance of inner-ear fluid with a high potassium concentration, and for generating the positive voltage in the inner ear, important for sound perception, by stimulating secretion of potassium from marginal cells. The gene SLC12A2 encodes a protein involved in sodium, potassium, and chloride transport essential for proper function of specific cells in the stria vascularis; however, human variants of SLC12A2 have not previously been associated with hearing loss. By comprehensive genetic analysis of protein-coding sequences, we identified four candidate changes in SLC12A2 in four families with congenital, severe-to-profound hearing loss. Intriguingly, all four genetic variants were either within or at the 3’-splice site of the exon 21 which encodes a part of the carboxy terminal intracellular domain of SLC12A2. Experiments in cultured cells showed that skipping or mutation of exon 21 significantly decreased chloride influx mediated by the SLC12A2 protein. Overall, our results strongly indicate that mutations influencing exon 21 of SLC12A2 represent a novel mechanism underlying deafness in humans.
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Affiliation(s)
- Hideki Mutai
- Division of Hearing and Balance Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Meguro, Tokyo, Japan
| | - Koichiro Wasano
- Division of Hearing and Balance Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Meguro, Tokyo, Japan
- Department of Otolaryngology-Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
| | - Yukihide Momozawa
- Laboratory for Genotyping Development, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
| | - Yoichiro Kamatani
- Laboratory for Statistical Analysis, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
- Kyoto-McGill International Collaborative School in Genomic Medicine, Graduate School of Medicine, Kyoto University, Yoshidakonoecho, Kyoto, Japan
| | - Fuyuki Miya
- Laboratory for Medical Science Mathematics, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
- Department of Medical Science Mathematics, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo, Tokyo, Japan
| | - Sawako Masuda
- Department of Otorhinolaryngology, National Hospital Organization Mie National Hospital, Tsu, Mie, Japan
| | - Noriko Morimoto
- Department of Otorhinolaryngology, National Center for Child Health and Development, Setagaya, Tokyo, Japan
| | - Kiyomitsu Nara
- Division of Hearing and Balance Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Meguro, Tokyo, Japan
| | - Satoe Takahashi
- Department of Otolaryngology-Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
| | - Tatsuhiko Tsunoda
- Laboratory for Medical Science Mathematics, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
- Department of Medical Science Mathematics, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo, Tokyo, Japan
- Laboratory for Medical Science Mathematics, Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo, Tokyo, Japan
| | - Kazuaki Homma
- Department of Otolaryngology-Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States of America
- The Hugh Knowles Center for Clinical and Basic Science in Hearing and Its Disorders, Northwestern University, Evanston, Illinois, United States of America
| | - Michiaki Kubo
- RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
| | - Tatsuo Matsunaga
- Division of Hearing and Balance Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Meguro, Tokyo, Japan
- Medical Genetics Center, National Hospital Organization Tokyo Medical Center, Meguro, Tokyo, Japan
- * E-mail:
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Burton JA, Valero MD, Hackett TA, Ramachandran R. The use of nonhuman primates in studies of noise injury and treatment. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2019; 146:3770. [PMID: 31795680 PMCID: PMC6881191 DOI: 10.1121/1.5132709] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 07/25/2019] [Accepted: 07/30/2019] [Indexed: 05/10/2023]
Abstract
Exposure to prolonged or high intensity noise increases the risk for permanent hearing impairment. Over several decades, researchers characterized the nature of harmful noise exposures and worked to establish guidelines for effective protection. Recent laboratory studies, primarily conducted in rodent models, indicate that the auditory system may be more vulnerable to noise-induced hearing loss (NIHL) than previously thought, driving renewed inquiries into the harmful effects of noise in humans. To bridge the translational gaps between rodents and humans, nonhuman primates (NHPs) may serve as key animal models. The phylogenetic proximity of NHPs to humans underlies tremendous similarity in many features of the auditory system (genomic, anatomical, physiological, behavioral), all of which are important considerations in the assessment and treatment of NIHL. This review summarizes the literature pertaining to NHPs as models of hearing and noise-induced hearing loss, discusses factors relevant to the translation of diagnostics and therapeutics from animals to humans, and concludes with some of the practical considerations involved in conducting NHP research.
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Affiliation(s)
- Jane A Burton
- Neuroscience Graduate Program, Vanderbilt University, Nashville, Tennessee 37212, USA
| | - Michelle D Valero
- Eaton Peabody Laboratories at Massachusetts Eye and Ear, Boston, Massachusetts 02114, USA
| | - Troy A Hackett
- Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
| | - Ramnarayan Ramachandran
- Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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