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Patergnani S, Bataillard MS, Danese A, Alves S, Cazevieille C, Valéro R, Tranebjærg L, Maurice T, Pinton P, Delprat B, Richard EM. The Wolfram-like variant WFS1 E864K destabilizes MAM and compromises autophagy and mitophagy in human and mice. Autophagy 2024:1-12. [PMID: 38651637 DOI: 10.1080/15548627.2024.2341588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 04/08/2024] [Indexed: 04/25/2024] Open
Abstract
Dominant variants in WFS1 (wolframin ER transmembrane glycoprotein), the gene coding for a mitochondria-associated endoplasmic reticulum (ER) membrane (MAM) resident protein, have been associated with Wolfram-like syndrome (WLS). In vitro and in vivo, WFS1 loss results in reduced ER to mitochondria calcium (Ca2+) transfer, mitochondrial dysfunction, and enhanced macroautophagy/autophagy and mitophagy. However, in the WLS pathological context, whether the mutant protein triggers the same cellular processes is unknown. Here, we show that in human fibroblasts and murine neuronal cultures the WLS protein WFS1E864K leads to decreases in mitochondria bioenergetics and Ca2+ uptake, deregulation of the mitochondrial quality system mechanisms, and alteration of the autophagic flux. Moreover, in the Wfs1E864K mouse, these alterations are concomitant with a decrease of MAM number. These findings reveal pathophysiological similarities between WS and WLS, highlighting the importance of WFS1 for MAM's integrity and functionality. It may open new treatment perspectives for patients with WLS.Abbreviations: BafA1: bafilomycin A1; ER: endoplasmic reticulum; HSPA9/GRP75: heat shock protein family A (Hsp70) member 9; ITPR/IP3R: inositol 1,4,5-trisphosphate receptor; MAM: mitochondria-associated endoplasmic reticulum membrane; MCU: mitochondrial calcium uniporter; MFN2: mitofusin 2; OCR: oxygen consumption rate; ROS: reactive oxygen species; ROT/AA: rotenone+antimycin A; VDAC1: voltage dependent anion channel 1; WLS: Wolfram-like syndrome; WS: Wolfram syndrome; WT: wild-type.
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Affiliation(s)
- Simone Patergnani
- Department of Medical Sciences, Section of Experimental Medicine, Technopole of Ferrara, Laboratory for Advanced Therapies (LTTA), Ferrara, Italy
| | | | - Alberto Danese
- Department of Medical Sciences, Section of Experimental Medicine, Technopole of Ferrara, Laboratory for Advanced Therapies (LTTA), Ferrara, Italy
| | - Stacy Alves
- MMDN, University Montpellier, EPHE, INSERM, Montpellier, France
| | | | - René Valéro
- Department of Nutrition, Metabolic Diseases and Endocrinology, Aix Marseille Univ, APHM, INSERM, INRAE, C2VN, University Hospital La Conception, Marseille, France
| | - Lisbeth Tranebjærg
- The Kennedy Center, Department of Clinical Genetics, Copenhagen University Hospital, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Tangui Maurice
- MMDN, University Montpellier, EPHE, INSERM, Montpellier, France
| | - Paolo Pinton
- Department of Medical Sciences, Section of Experimental Medicine, Technopole of Ferrara, Laboratory for Advanced Therapies (LTTA), Ferrara, Italy
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Crouzier L, Meunier J, Carles A, Morilleau A, Vrigneau C, Schmitt M, Bourguignon JJ, Delprat B, Maurice T. Convolamine, a tropane alkaloid extracted from Convolvulus plauricalis, is a potent sigma-1 receptor-positive modulator with cognitive and neuroprotective properties. Phytother Res 2024; 38:694-712. [PMID: 38011416 DOI: 10.1002/ptr.8068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/26/2023] [Accepted: 10/28/2023] [Indexed: 11/29/2023]
Abstract
BACKGROUND AND AIM By using an in vivo phenotypic screening assay in zebrafish, we identified Convolamine, a tropane alkaloid from Convulvus plauricalis, as a positive modulator of the sigma-1 receptor (S1R). The wfs1abKO zebrafish larva, a model of Wolfram syndrome, exhibits an increased visual-motor response due to a mutation in Wolframin, a protein involved in endoplasmic reticulum-mitochondria communication. We previously reported that ligand activating S1R, restored the cellular and behavioral deficits in patient fibroblasts and zebrafish and mouse models. EXPERIMENTAL PROCEDURES We screened a library of 108 repurposing and natural compounds on zebrafish motor response. KEY RESULTS One hit, the tropane alkaloid Convolamine, restored normal mobility in wfs1abKO larvae without affecting wfs1abWT controls. They did not bind to the S1R agonist/antagonist binding site nor dissociated S1R from BiP, an S1R activity assay in vitro, but behaved as a positive modulator by shifting the IC50 value of the reference agonist PRE-084 to lower values. Convolamine restored learning in Wfs1∆Exon8 , Dizocilpine-treated, and Aβ25-35 -treated mice. These effects were observed at low ~1 mg/kg doses, not shared by Convolvine, the desmethyl metabolite, and blocked by an S1R antagonist. CONCLUSION AND IMPLICATIONS Convolamine therefore acts as an S1R positive modulator and this pharmacological action is relevant to the traditional use of Shankhpushpi in memory and cognitive protection.
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Affiliation(s)
- Lucie Crouzier
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
| | - Johann Meunier
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
| | - Allison Carles
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
| | - Axelle Morilleau
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
| | | | | | | | - Benjamin Delprat
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
| | - Tangui Maurice
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
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Richard EM, Brun E, Korchagina J, Crouzier L, Affortit C, Alves S, Cazevieille C, Mausset-Bonnefont AL, Lenoir M, Puel JL, Maurice T, Thiry M, Wang J, Delprat B. Wfs1 E864K knock-in mice illuminate the fundamental role of Wfs1 in endocochlear potential production. Cell Death Dis 2023; 14:387. [PMID: 37386014 PMCID: PMC10310813 DOI: 10.1038/s41419-023-05912-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 06/08/2023] [Accepted: 06/20/2023] [Indexed: 07/01/2023]
Abstract
Wolfram syndrome (WS) is a rare neurodegenerative disorder encompassing diabetes mellitus, diabetes insipidus, optic atrophy, hearing loss (HL) as well as neurological disorders. None of the animal models of the pathology are presenting with an early onset HL, impeding the understanding of the role of Wolframin (WFS1), the protein responsible for WS, in the auditory pathway. We generated a knock-in mouse, the Wfs1E864K line, presenting a human mutation leading to severe deafness in affected individuals. The homozygous mice showed a profound post-natal HL and vestibular syndrome, a collapse of the endocochlear potential (EP) and a devastating alteration of the stria vascularis and neurosensory epithelium. The mutant protein prevented the localization to the cell surface of the Na+/K+ATPase β1 subunit, a key protein for the maintenance of the EP. Overall, our data support a key role of WFS1 in the maintenance of the EP and the stria vascularis, via its binding partner, the Na+/K+ATPase β1 subunit.
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Affiliation(s)
| | - Emilie Brun
- INM, Univ Montpellier, INSERM, Montpellier, France
| | | | - Lucie Crouzier
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | - Stacy Alves
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | | | - Marc Lenoir
- INM, Univ Montpellier, INSERM, Montpellier, France
| | | | - Tangui Maurice
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Marc Thiry
- Laboratoire de Biologie Cellulaire, Université de Liège, Liège, Belgique
| | - Jing Wang
- INM, Univ Montpellier, INSERM, Montpellier, France
| | - Benjamin Delprat
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France.
- INM, Univ Montpellier, INSERM, Montpellier, France.
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4
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Crouzier L, Danese A, Yasui Y, Richard EM, Liévens JC, Patergnani S, Couly S, Diez C, Denus M, Cubedo N, Rossel M, Thiry M, Su TP, Pinton P, Maurice T, Delprat B. Activation of the sigma-1 receptor chaperone alleviates symptoms of Wolfram syndrome in preclinical models. Sci Transl Med 2022; 14:eabh3763. [PMID: 35138910 PMCID: PMC9516885 DOI: 10.1126/scitranslmed.abh3763] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The Wolfram syndrome is a rare autosomal recessive disease affecting many organs with life-threatening consequences; currently, no treatment is available. The disease is caused by mutations in the WSF1 gene, coding for the protein wolframin, an endoplasmic reticulum (ER) transmembrane protein involved in contacts between ER and mitochondria termed as mitochondria-associated ER membranes (MAMs). Inherited mutations usually reduce the protein's stability, altering its homeostasis and ultimately reducing ER to mitochondria calcium ion transfer, leading to mitochondrial dysfunction and cell death. In this study, we found that activation of the sigma-1 receptor (S1R), an ER-resident protein involved in calcium ion transfer, could counteract the functional alterations of MAMs due to wolframin deficiency. The S1R agonist PRE-084 restored calcium ion transfer and mitochondrial respiration in vitro, corrected the associated increased autophagy and mitophagy, and was able to alleviate the behavioral symptoms observed in zebrafish and mouse models of the disease. Our findings provide a potential therapeutic strategy for treating Wolfram syndrome by efficiently boosting MAM function using the ligand-operated S1R chaperone. Moreover, such strategy might also be relevant for other degenerative and mitochondrial diseases involving MAM dysfunction.
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Affiliation(s)
- Lucie Crouzier
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Alberto Danese
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Yuko Yasui
- Cellular Pathobiology Section, Integrative Neuroscience Research Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, 333 Cassell Drive, Baltimore, MD 21224, USA
| | | | | | - Simone Patergnani
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Simon Couly
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
- Cellular Pathobiology Section, Integrative Neuroscience Research Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Camille Diez
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Morgane Denus
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Nicolas Cubedo
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | - Marc Thiry
- Laboratoire de Biologie Cellulaire, Université de Liège, GIGA-Neurosciences, Quartier Hopital, Avenue Hippocrate 15, 4000 Liege 1, Belgium
| | - Tsung-Ping Su
- Cellular Pathobiology Section, Integrative Neuroscience Research Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Paolo Pinton
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Tangui Maurice
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
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Abatematteo FS, Mosier PD, Niso M, Brunetti L, Berardi F, Loiodice F, Contino M, Delprat B, Maurice T, Laghezza A, Abate C. Development of novel phenoxyalkylpiperidines as high-affinity Sigma-1 (σ 1) receptor ligands with potent anti-amnesic effect. Eur J Med Chem 2022; 228:114038. [PMID: 34902734 DOI: 10.1016/j.ejmech.2021.114038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/24/2021] [Accepted: 12/01/2021] [Indexed: 12/21/2022]
Abstract
The sigma-1 (σ1) receptor plays a significant role in many normal physiological functions and pathological disease states, and as such represents an attractive therapeutic target for both agonists and antagonists. Here, we describe a novel series of phenoxyalkylpiperidines based on the lead compound 1-[ω-(4-chlorophenoxy)ethyl]-4-methylpiperidine (1a) in which the degree of methylation at the carbon atoms alpha to the piperidine nitrogen was systematically varied. The affinity at σ1 and σ2 receptors and at Δ8-Δ7 sterol isomerase (SI) ranged from subnanomolar to micromolar Ki values. While the highest-affinity was displayed at the σ1, the increase of the degree of methylation in the piperidine ring progressively decreased the affinity. The subnanomolar affinity 1a and 1-[ω-(4-methoxyphenoxy)ethyl]-4-methylpiperidine (1b) displayed potent anti-amnesic effects associated with σ1 receptor agonism, in two memory tests. Automated receptor-small-molecule ligand docking provided a molecular structure-based rationale for the agonistic effects of 1a and 1b. Overall, the class of the phenoxyalkylpiperidines holds potential for the development of high affinity σ1 receptor agonists, and compound 1a, that appears as the best in class (exceeding by far the activity of the reference compound PRE-084) deserves further investigation.
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Affiliation(s)
- Francesca S Abatematteo
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy
| | - Philip D Mosier
- Department of Biopharmaceutical Sciences, School of Pharmacy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Mauro Niso
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy
| | - Leonardo Brunetti
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy
| | - Francesco Berardi
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy
| | - Fulvio Loiodice
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy
| | - Marialessandra Contino
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy
| | - Benjamin Delprat
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
| | - Tangui Maurice
- MMDN, University of Montpellier, EPHE, INSERM, Montpellier, France
| | - Antonio Laghezza
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy.
| | - Carmen Abate
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari, ALDO MORO, Via Orabona, 4, I-70125, Bari, Italy.
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Crouzier L, Richard EM, Diez C, Alzaeem H, Denus M, Cubedo N, Delaunay T, Glendenning E, Baxendale S, Liévens JC, Whitfield TT, Maurice T, Delprat B. OUP accepted manuscript. Hum Mol Genet 2022; 31:2711-2727. [PMID: 35325133 PMCID: PMC9402244 DOI: 10.1093/hmg/ddac065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 02/28/2022] [Accepted: 03/15/2022] [Indexed: 12/03/2022] Open
Abstract
Wolfram syndrome (WS) is a rare genetic disease characterized by diabetes, optic atrophy and deafness. Patients die at 35 years of age, mainly from respiratory failure or dysphagia. Unfortunately, there is no treatment to block the progression of symptoms and there is an urgent need for adequate research models. Here, we report on the phenotypical characterization of two loss-of-function zebrafish mutant lines: wfs1aC825X and wfs1bW493X. We observed that wfs1a deficiency altered the size of the ear and the retina of the fish. We also documented a decrease in the expression level of unfolded protein response (UPR) genes in basal condition and in stress condition, i.e. after tunicamycin treatment. Interestingly, both mutants lead to a decrease in their visual function measured behaviorally. These deficits were associated with a decrease in the expression level of UPR genes in basal and stress conditions. Interestingly, basal, ATP-linked and maximal mitochondrial respirations were transiently decreased in the wfs1b mutant. Taken together, these zebrafish lines highlight the critical role of wfs1a and wfs1b in UPR, mitochondrial function and visual physiology. These models will be useful tools to better understand the cellular function of Wfs1 and to develop novel therapeutic approaches for WS.
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Affiliation(s)
- Lucie Crouzier
- MMDN, Université Montpellier, EPHE, INSERM, Montpellier, France
| | | | - Camille Diez
- MMDN, Université Montpellier, EPHE, INSERM, Montpellier, France
| | - Hala Alzaeem
- MMDN, Université Montpellier, EPHE, INSERM, Montpellier, France
| | - Morgane Denus
- MMDN, Université Montpellier, EPHE, INSERM, Montpellier, France
| | - Nicolas Cubedo
- MMDN, Université Montpellier, EPHE, INSERM, Montpellier, France
| | | | - Emily Glendenning
- Development, Regeneration and Neurophysiology, School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK
| | - Sarah Baxendale
- Development, Regeneration and Neurophysiology, School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK
| | | | - Tanya T Whitfield
- Development, Regeneration and Neurophysiology, School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK
| | - Tangui Maurice
- MMDN, Université Montpellier, EPHE, INSERM, Montpellier, France
| | - Benjamin Delprat
- To whom correspondence should be addressed: Tel: +33 467143623; Fax: +33 47149295;
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7
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Crouzier L, Richard EM, Sourbron J, Lagae L, Maurice T, Delprat B. Use of Zebrafish Models to Boost Research in Rare Genetic Diseases. Int J Mol Sci 2021; 22:13356. [PMID: 34948153 PMCID: PMC8706563 DOI: 10.3390/ijms222413356] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 02/06/2023] Open
Abstract
Rare genetic diseases are a group of pathologies with often unmet clinical needs. Even if rare by a single genetic disease (from 1/2000 to 1/more than 1,000,000), the total number of patients concerned account for approximatively 400 million peoples worldwide. Finding treatments remains challenging due to the complexity of these diseases, the small number of patients and the challenge in conducting clinical trials. Therefore, innovative preclinical research strategies are required. The zebrafish has emerged as a powerful animal model for investigating rare diseases. Zebrafish combines conserved vertebrate characteristics with high rate of breeding, limited housing requirements and low costs. More than 84% of human genes responsible for diseases present an orthologue, suggesting that the majority of genetic diseases could be modelized in zebrafish. In this review, we emphasize the unique advantages of zebrafish models over other in vivo models, particularly underlining the high throughput phenotypic capacity for therapeutic screening. We briefly introduce how the generation of zebrafish transgenic lines by gene-modulating technologies can be used to model rare genetic diseases. Then, we describe how zebrafish could be phenotyped using state-of-the-art technologies. Two prototypic examples of rare diseases illustrate how zebrafish models could play a critical role in deciphering the underlying mechanisms of rare genetic diseases and their use to identify innovative therapeutic solutions.
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Affiliation(s)
- Lucie Crouzier
- MMDN, University of Montpellier, EPHE, INSERM, 34095 Montpellier, France; (L.C.); (E.M.R.); (T.M.)
| | - Elodie M. Richard
- MMDN, University of Montpellier, EPHE, INSERM, 34095 Montpellier, France; (L.C.); (E.M.R.); (T.M.)
| | - Jo Sourbron
- Department of Development and Regeneration, Section Pediatric Neurology, University Hospital KU Leuven, 3000 Leuven, Belgium; (J.S.); (L.L.)
| | - Lieven Lagae
- Department of Development and Regeneration, Section Pediatric Neurology, University Hospital KU Leuven, 3000 Leuven, Belgium; (J.S.); (L.L.)
| | - Tangui Maurice
- MMDN, University of Montpellier, EPHE, INSERM, 34095 Montpellier, France; (L.C.); (E.M.R.); (T.M.)
| | - Benjamin Delprat
- MMDN, University of Montpellier, EPHE, INSERM, 34095 Montpellier, France; (L.C.); (E.M.R.); (T.M.)
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Crouzier L, Denus M, Richard EM, Tavernier A, Diez C, Cubedo N, Maurice T, Delprat B. Sigma-1 Receptor Is Critical for Mitochondrial Activity and Unfolded Protein Response in Larval Zebrafish. Int J Mol Sci 2021; 22:11049. [PMID: 34681705 PMCID: PMC8537383 DOI: 10.3390/ijms222011049] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/06/2021] [Accepted: 10/10/2021] [Indexed: 01/05/2023] Open
Abstract
The sigma-1 receptor (S1R) is a highly conserved transmembrane protein highly enriched in mitochondria-associated endoplasmic reticulum (ER) membranes, where it interacts with several partners involved in ER-mitochondria Ca2+ transfer, activation of the ER stress pathways, and mitochondria function. We characterized a new S1R deficient zebrafish line and analyzed the impact of S1R deficiency on visual, auditory and locomotor functions. The s1r+25/+25 mutant line showed impairments in visual and locomotor functions compared to s1rWT. The locomotion of the s1r+25/+25 larvae, at 5 days post fertilization, was increased in the light and dark phases of the visual motor response. No deficit was observed in acoustic startle response. A critical role of S1R was shown in ER stress pathways and mitochondrial activity. Using qPCR to analyze the unfolded protein response genes, we observed that loss of S1R led to decreased levels of IRE1 and PERK-related effectors and increased over-expression of most of the effectors after a tunicamycin challenge. Finally, S1R deficiency led to alterations in mitochondria bioenergetics with decreased in basal, ATP-linked and non-mitochondrial respiration and following tunicamycin challenge. In conclusion, this new zebrafish model confirmed the importance of S1R activity on ER-mitochondria communication. It will be a useful tool to further analyze the physiopathological roles of S1R.
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Affiliation(s)
| | | | | | | | | | | | | | - Benjamin Delprat
- MMDN, University of Montpellier, EPHE, INSERM, 34095 Montpellier, France; (L.C.); (M.D.); (E.M.R.); (A.T.); (C.D.); (N.C.); (T.M.)
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9
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Bassani S, Beelen E, Rossel M, Voisin N, Morgan A, Arribat Y, Chatron N, Chrast J, Cocca M, Delprat B, Faletra F, Giannuzzi G, Guex N, Machavoine R, Pradervand S, Smits JJ, van de Kamp JM, Ziegler A, Amati F, Marlin S, Kremer H, Locher H, Maurice T, Gasparini P, Girotto G, Reymond A. Variants in USP48 encoding ubiquitin hydrolase are associated with autosomal dominant non-syndromic hereditary hearing loss. Hum Mol Genet 2021; 30:1785-1796. [PMID: 34059922 DOI: 10.1093/hmg/ddab145] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 02/07/2023] Open
Abstract
Non-Syndromic Hereditary Hearing Loss (NSHHL) is a genetically heterogeneous sensory disorder with about 120 genes already associated. Through exome sequencing and data aggregation, we identified a family with six affected individuals and one unrelated NSHHL patient with predicted-to-be deleterious missense variants in USP48. We also uncovered an eighth patient presenting unilateral cochlear nerve aplasia and a de novo splice variant in the same gene. USP48 encodes a ubiquitin carboxyl-terminal hydrolase under evolutionary constraint. Pathogenicity of the variants is supported by in vitro assays that showed that the mutated proteins are unable to hydrolyze tetra-ubiquitin. Correspondingly, three-dimensional representation of the protein containing the familial missense variant affects a loop that controls binding to ubiquitin. Consistent with a contribution of USP48 to auditory function, immunohistology showed that the encoded protein is expressed in the developing human inner ear, specifically in the spiral ganglion neurons, outer sulcus, interdental cells of the spiral limbus, stria vascularis, Reissner's membrane, and in the transient Kolliker's organ that is essential for auditory development. Engineered zebrafish knocked-down for usp48, the USP48 ortholog, presented with a delayed development of primary motor neurons, less developed statoacoustic neurons innervating the ears, decreased swimming velocity and circling swimming behavior indicative of vestibular dysfunction and hearing impairment. Corroboratingly, acoustic startle response assays revealed a significant decrease of auditory response of zebrafish lacking usp48 at 600 Hz and 800 Hz wavelengths. In conclusion, we describe a novel autosomal dominant NSHHL gene through a multipronged approach combining exome sequencing, animal modeling, immunohistology and molecular assays.
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Affiliation(s)
- Sissy Bassani
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.,Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy
| | - Edward Beelen
- Department of Otorhinolaryngology, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Norine Voisin
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Anna Morgan
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy.,Institute for Maternal and Child Health, IRCCS, Burlo Garofolo, Trieste, Italy
| | - Yoan Arribat
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
| | - Nicolas Chatron
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.,Service de Génétique, Hospices Civils de Lyon, Lyon, France
| | - Jacqueline Chrast
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Massimiliano Cocca
- Institute for Maternal and Child Health, IRCCS, Burlo Garofolo, Trieste, Italy
| | | | - Flavio Faletra
- Institute for Maternal and Child Health, IRCCS, Burlo Garofolo, Trieste, Italy
| | - Giuliana Giannuzzi
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Nicolas Guex
- Bioinformatics Competence Center, University of Lausanne, Lausanne, Switzerland
| | - Roxane Machavoine
- Centre de référence Surdités Génétiques, Hôpital Necker, Institut Imagine, Paris, France
| | - Sylvain Pradervand
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Jeroen J Smits
- Department of Otorhinolaryngology and Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jiddeke M van de Kamp
- Department of Clinical Genetics, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Alban Ziegler
- Centre de référence Surdités Génétiques, Hôpital Necker, Institut Imagine, Paris, France
| | - Francesca Amati
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
| | - Sandrine Marlin
- Centre de référence Surdités Génétiques, Hôpital Necker, Institut Imagine, Paris, France
| | - Hannie Kremer
- Department of Otorhinolaryngology and Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Heiko Locher
- Department of Otorhinolaryngology, Leiden University Medical Center, Leiden, The Netherlands
| | - Tangui Maurice
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Paolo Gasparini
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy.,Institute for Maternal and Child Health, IRCCS, Burlo Garofolo, Trieste, Italy
| | - Giorgia Girotto
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy.,Institute for Maternal and Child Health, IRCCS, Burlo Garofolo, Trieste, Italy
| | - Alexandre Reymond
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
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10
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Crouzier L, Diez C, Richard EM, Cubedo N, Barbereau C, Rossel M, Delaunay T, Maurice T, Delprat B. Loss of Pde6a Induces Rod Outer Segment Shrinkage and Visual Alterations in pde6aQ70X Mutant Zebrafish, a Relevant Model of Retinal Dystrophy. Front Cell Dev Biol 2021; 9:675517. [PMID: 34095146 PMCID: PMC8173125 DOI: 10.3389/fcell.2021.675517] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 04/26/2021] [Indexed: 11/13/2022] Open
Abstract
Retinitis pigmentosa (RP) is one of the most common forms of inherited retinal degeneration with 1/4,000 people being affected. The vision alteration primarily begins with rod photoreceptor degeneration, then the degenerative process continues with cone photoreceptor death. Variants in 71 genes have been linked to RP. One of these genes, PDE6a is responsible for RP43. To date no treatment is available and patients suffer from pronounced visual impairment in early childhood. We used the novel zebrafish pde6aQ70X mutant, generated by N-ethyl-N-nitrosourea at the European Zebrafish Resource Centre, to better understand how PDE6a loss of function leads to photoreceptor alteration. Interestingly, zebrafish pde6aQ70X mutants exhibited impaired visual function at 5 dpf as evidenced by the decrease in their visual motor response (VMR) compared to pde6aWT larvae. This impaired visual function progressed with time and was more severe at 21 dpf. These modifications were associated with an alteration of rod outer segment length at 5 and 21 dpf. In summary, these findings suggest that rod outer segment shrinkage due to Pde6a deficiency begins very early in zebrafish, progresses with time. The zebrafish pde6aQ70X mutant represents an ideal model of RP to screen relevant active small molecules that will block the progression of the disease.
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Affiliation(s)
- Lucie Crouzier
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Camille Diez
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | - Nicolas Cubedo
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | | | | | - Tangui Maurice
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
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11
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Patergnani S, Marchi S, Delprat B, Wieckowski MR. Editorial: Organelles Relationships and Interactions: A Cancer Perspective. Front Cell Dev Biol 2021; 9:678307. [PMID: 33898471 PMCID: PMC8060626 DOI: 10.3389/fcell.2021.678307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 03/15/2021] [Indexed: 11/22/2022] Open
Affiliation(s)
- Simone Patergnani
- Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Saverio Marchi
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
| | | | - Mariusz R Wieckowski
- Laboratory of Mitochondrial Biology and Metabolism, Nencki Institute of Experimental Biology of the Polish Academy of Sciences, Warsaw, Poland
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12
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Crouzier L, Couly S, Roques C, Peter C, Belkhiter R, Arguel Jacquemin M, Bonetto A, Delprat B, Maurice T. Sigma-1 (σ 1) receptor activity is necessary for physiological brain plasticity in mice. Eur Neuropsychopharmacol 2020; 39:29-45. [PMID: 32893057 DOI: 10.1016/j.euroneuro.2020.08.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/24/2020] [Accepted: 08/25/2020] [Indexed: 12/14/2022]
Abstract
The sigma-1 receptor (S1R) is a membrane-associated protein expressed in neurons and glia at mitochondria-associated endoplasmic reticulum (ER) membranes (MAMs). S1R interacts with different partners to regulate cellular responses, including ER stress, mitochondrial physiology and Ca2+ fluxes. S1R shapes cellular plasticity by directly modulating signaling pathways involved in inflammatory responses, cell survival and death. We here analyzed its impact on brain plasticity in vivo, in mice trained in a complex maze, the Hamlet test. The device, providing strong enriched environment (EE) conditions, mimics a small village. It has a central agora and streets expanding from it, leading to functionalized houses where animals can Drink, Eat, Hide, Run, or Interact. Animals were trained in groups, 4 h/day for two weeks, and their maze exploration and topographic memory could be analyzed. Several groups of mice were considered: non-trained vs. trained; repeatedly administered with saline vs. NE-100, a selective S1R antagonist; and wildtype vs. S1R KO mice. S1R inactivation altered maze exploration and prevented topographic learning. EE induced a strong plasticity measured through resilience to behavioral despair or to the amnesic effects of scopolamine, and increases in S1R expression and bdnf mRNA levels in the hippocampus; increases in neurogenesis (proliferation and maturation); and increases of histone acetylation in the hippocampus and cortex. S1R inactivation altered all these parameters significantly, showing that S1R activity plays a major role in physiological brain plasticity. As S1R is a major resident protein in MAMs, modulating ER responses and mitochondrial homeostasy, MAM physiology appeared impacted by enriched environment.
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Affiliation(s)
- Lucie Crouzier
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Simon Couly
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Chloé Roques
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Coralie Peter
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | | | - Anna Bonetto
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | - Tangui Maurice
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France.
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13
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Abstract
Calcium exchanges and homeostasis are finely regulated between cellular organelles and in response to physiological signals. Besides ionophores, including voltage-gated Ca2+ channels, ionotropic neurotransmitter receptors, or Store-operated Ca2+ entry, activity of regulatory intracellular proteins finely tune Calcium homeostasis. One of the most intriguing, by its unique nature but also most promising by the therapeutic opportunities it bears, is the sigma-1 receptor (Sig-1R). The Sig-1R is a chaperone protein residing at mitochondria-associated endoplasmic reticulum (ER) membranes (MAMs), where it interacts with several partners involved in ER stress response, or in Ca2+ exchange between the ER and mitochondria. Small molecules have been identified that specifically and selectively activate Sig-1R (Sig-1R agonists or positive modulators) at the cellular level and that also allow effective pharmacological actions in several pre-clinical models of pathologies. The present review will summarize the recent data on the mechanism of action of Sig-1R in regulating Ca2+ exchanges and protein interactions at MAMs and the ER. As MAMs alterations and ER stress now appear as a common track in most neurodegenerative diseases, the intracellular action of Sig-1R will be discussed in the context of the recently reported efficacy of Sig-1R drugs in pathologies like Alzheimer's disease, Parkinson's disease, Huntington's disease, or amyotrophic lateral sclerosis.
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Affiliation(s)
- Benjamin Delprat
- MMDN, University of Montpellier, EPHE, INSERM, U1198, Montpellier, France.
| | - Lucie Crouzier
- MMDN, University of Montpellier, EPHE, INSERM, U1198, Montpellier, France
| | - Tsung-Ping Su
- Cellular Pathobiology Section, Integrative Neuroscience Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, DHHS, IRP, NIDA/NIH, Baltimore, MD, USA
| | - Tangui Maurice
- MMDN, University of Montpellier, EPHE, INSERM, U1198, Montpellier, France
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14
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Abstract
Calcium exchanges and homeostasis are finely regulated between cellular organelles and in response to physiological signals. Besides ionophores, including voltage-gated Ca2+ channels, ionotropic neurotransmitter receptors, or Store-operated Ca2+ entry, activity of regulatory intracellular proteins finely tune Calcium homeostasis. One of the most intriguing, by its unique nature but also most promising by the therapeutic opportunities it bears, is the sigma-1 receptor (Sig-1R). The Sig-1R is a chaperone protein residing at mitochondria-associated endoplasmic reticulum (ER) membranes (MAMs), where it interacts with several partners involved in ER stress response, or in Ca2+ exchange between the ER and mitochondria. Small molecules have been identified that specifically and selectively activate Sig-1R (Sig-1R agonists or positive modulators) at the cellular level and that also allow effective pharmacological actions in several pre-clinical models of pathologies. The present review will summarize the recent data on the mechanism of action of Sig-1R in regulating Ca2+ exchanges and protein interactions at MAMs and the ER. As MAMs alterations and ER stress now appear as a common track in most neurodegenerative diseases, the intracellular action of Sig-1R will be discussed in the context of the recently reported efficacy of Sig-1R drugs in pathologies like Alzheimer's disease, Parkinson's disease, Huntington's disease, or amyotrophic lateral sclerosis.
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Affiliation(s)
- Benjamin Delprat
- MMDN, University of Montpellier, EPHE, INSERM, U1198, Montpellier, France.
| | - Lucie Crouzier
- MMDN, University of Montpellier, EPHE, INSERM, U1198, Montpellier, France
| | - Tsung-Ping Su
- Cellular Pathobiology Section, Integrative Neuroscience Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, DHHS, IRP, NIDA/NIH, Baltimore, MD, USA
| | - Tangui Maurice
- MMDN, University of Montpellier, EPHE, INSERM, U1198, Montpellier, France
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15
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Angebault C, Fauconnier J, Patergnani S, Rieusset J, Danese A, Affortit CA, Jagodzinska J, Mégy C, Quiles M, Cazevieille C, Korchagina J, Bonnet-Wersinger D, Milea D, Hamel C, Pinton P, Thiry M, Lacampagne A, Delprat B, Delettre C. ER-mitochondria cross-talk is regulated by the Ca 2+ sensor NCS1 and is impaired in Wolfram syndrome. Sci Signal 2018; 11:11/553/eaaq1380. [PMID: 30352948 DOI: 10.1126/scisignal.aaq1380] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Communication between the endoplasmic reticulum (ER) and mitochondria plays a pivotal role in Ca2+ signaling, energy metabolism, and cell survival. Dysfunction in this cross-talk leads to metabolic and neurodegenerative diseases. Wolfram syndrome is a fatal neurodegenerative disease caused by mutations in the ER-resident protein WFS1. Here, we showed that WFS1 formed a complex with neuronal calcium sensor 1 (NCS1) and inositol 1,4,5-trisphosphate receptor (IP3R) to promote Ca2+ transfer between the ER and mitochondria. In addition, we found that NCS1 abundance was reduced in WFS1-null patient fibroblasts, which showed reduced ER-mitochondria interactions and Ca2+ exchange. Moreover, in WFS1-deficient cells, NCS1 overexpression not only restored ER-mitochondria interactions and Ca2+ transfer but also rescued mitochondrial dysfunction. Our results describe a key role of NCS1 in ER-mitochondria cross-talk, uncover a pathogenic mechanism for Wolfram syndrome, and potentially reveal insights into the pathogenesis of other neurodegenerative diseases.
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Affiliation(s)
- Claire Angebault
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France.,PhyMedExp, University of Montpellier, INSERM, CNRS, CHRU Montpellier, 34295 Montpellier, France
| | - Jérémy Fauconnier
- PhyMedExp, University of Montpellier, INSERM, CNRS, CHRU Montpellier, 34295 Montpellier, France
| | - Simone Patergnani
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy.,Maria Cecilia Hospital, GVM Care & Research, Cotignola, 48033 Ravenna, Italy
| | - Jennifer Rieusset
- INSERM U1060, UMR INRA 1397, CarMeN Laboratory, Lyon 1 University, F-69003 Lyon, France
| | - Alberto Danese
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Corentin A Affortit
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France
| | - Jolanta Jagodzinska
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France
| | - Camille Mégy
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France
| | - Mélanie Quiles
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France
| | - Chantal Cazevieille
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France
| | - Julia Korchagina
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France
| | - Delphine Bonnet-Wersinger
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France
| | - Dan Milea
- Department of Ophthalmology, Angers University Hospital, 43933 Angers, France.,Singapore Eye Research Institute, Duke-NUS Graduate Medical School, 169857 Singapore, Singapore
| | - Christian Hamel
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France.,CHRU Montpellier, Centre of Reference for Genetic Sensory Diseases, CHU, Gui de Chauliac Hospital, 34090 Montpellier, France
| | - Paolo Pinton
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Marc Thiry
- Laboratoire de Biologie Cellulaire, Université de Liège, Bât. B36 (Tour 4) GIGA-Neurosciences, Quartier Hôpital, Avenue Hippocrate 15, 4000 Liège 1, Belgium
| | - Alain Lacampagne
- PhyMedExp, University of Montpellier, INSERM, CNRS, CHRU Montpellier, 34295 Montpellier, France
| | - Benjamin Delprat
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France. .,MMDN, Univ. Montpellier, EPHE, INSERM U1198, F-34095 Montpellier, France
| | - Cécile Delettre
- Institute of Neurosciences of Montpellier, INSERM, University of Montpellier, 34090 Montpellier, France.
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16
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Abstract
Wolfram syndrome (WS) is a rare neurodegenerative disease, the main pathological hallmarks of which associate with diabetes, optic atrophy, and deafness. Other symptoms may be identified in some but not all patients. Prognosis is poor, with death occurring around 35 years of age. To date, no treatment is available. WS was first described as a mitochondriopathy. However, the localization of the protein on the endoplasmic reticulum (ER) membrane challenged this hypothesis. ER contacts mitochondria to ensure effective Ca2+ transfer, lipids transfer, and apoptosis within stabilized and functionalized microdomains, termed “mitochondria-associated ER membranes” (MAMs). Two types of WS are characterized so far and Wolfram syndrome type 2 is due to mutation in CISD2, a protein mostly expressed in MAMs. The aim of the present review is to collect evidences showing that WS is indeed a mitochondriopathy, with established MAM dysfunction, and thus share commonalities with several neurodegenerative diseases, including Alzheimer’s disease, Parkinson’s disease, and amyotrophic lateral sclerosis, as well as metabolic diseases, such as diabetes.
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Affiliation(s)
- Benjamin Delprat
- INSERM UMR-S1198, 34095, Montpellier, France. .,University of Montpellier, 34095, Montpellier, France.
| | - Tangui Maurice
- INSERM UMR-S1198, 34095, Montpellier, France.,University of Montpellier, 34095, Montpellier, France
| | - Cécile Delettre
- University of Montpellier, 34095, Montpellier, France. .,INSERM UMR-S1051, Institute of Neurosciences of Montpellier, 34090, Montpellier, France.
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17
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Grau T, Burbulla LF, Engl G, Delettre C, Delprat B, Oexle K, Leo-Kottler B, Roscioli T, Krüger R, Rapaport D, Wissinger B, Schimpf-Linzenbold S. A novel heterozygousOPA3mutation located in the mitochondrial target sequence results in altered steady-state levels and fragmented mitochondrial network. J Med Genet 2013; 50:848-58. [DOI: 10.1136/jmedgenet-2013-101774] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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18
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Molina L, Fasquelle L, Nouvian R, Salvetat N, Scott HS, Guipponi M, Molina F, Puel JL, Delprat B. Tmprss3 loss of function impairs cochlear inner hair cell Kcnma1 channel membrane expression. Hum Mol Genet 2012; 22:1289-99. [PMID: 23255163 DOI: 10.1093/hmg/dds532] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Before acquiring their mature state, cochlear hair cells undergo a series of changes in expression of ion channels. How this complex mechanism is achieved is not fully understood. Tmprss3, a type II serine protease expressed in hair cells, is required for their proper functioning at the onset of hearing. To unravel the role of Tmprss3 in the acquisition of mature K(+) currents, we compared their function by patch-clamp technique in wild-type Tmprss3(WT) and Tmprss3(Y260X)-mutant mice. Interestingly, only outward K(+) currents were altered in Tmprss3(Y260X)-mutant mice. To determine by which mechanism this occurred, we compared the protein network of Tmprss3(WT) and Tmprss3(Y260X)-mutant mice using proteomic analysis. This led to the identification of a pathway related to potassium Kcnma1 channels. This pathway was validated by immunohistochemistry, focusing on the most downregulated protein that was identified as a cochlear Kcnma1-associated protein, APOA1. Finally, we show that, in contrast to Tmprss3(WT), Kcnma1 channels were absent at the neck of inner hair cells (IHCs) in Tmprss3(Y260X)-mutant mice. In conclusion, our data suggest that lack of Tmprss3 leads to a decrease in Kcnma1 potassium channels expression in (IHCs).
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Affiliation(s)
- Laurence Molina
- SysDiag UMR 3145 CNRS/Bio-Rad, Cap Delta/Parc Euromédecine, 1682 rue de la Valsière, Cedex 4,Montpellier, France
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19
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Charif M, Abidi O, Boulouiz R, Nahili H, Rouba H, Kandil M, Delprat B, Lenaers G, Barakat A. Molecular analysis of the TMPRSS3 gene in Moroccan families with non-syndromic hearing loss. Biochem Biophys Res Commun 2012; 419:643-7. [PMID: 22382023 DOI: 10.1016/j.bbrc.2012.02.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 02/13/2012] [Indexed: 11/18/2022]
Abstract
Autosomal recessive non-syndromic hearing impairment (ARNSHI) is the most common type of inherited hearing impairment, accounting for approximately 80% of inherited prelingual hearing impairment. Hearing loss is noted to be both phenotypically and genetically heterogeneous. Mutations in the TMPRSS3 gene, which encodes a transmembrane serine protease, are known to cause autosomal recessive non-syndromic hearing impairment DFNB8/10. In order to elucidate if the TMPRSS3 gene is responsible for ARNSHI in 80 Moroccan families with non-syndromic hearing impairment, the gene was sequenced using DNA samples from these families. Nineteen TMPRSS3 variants were found, nine are located in the exons among which six are missense and three are synonymous. The 10 remaining variations are located in non-coding regions. Missense variants analysis show that they do not have a significant pathogenic effect on protein while pathogenicity of some variant remains under discussion. Thus we show that the TMPRSS3 gene is not a major contributor to non-syndromic deafness in the Moroccan population.
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Affiliation(s)
- Majida Charif
- Laboratoire de Génétique Moléculaire et Humaine, Département de Recherche Scientifique, Institut Pasteur du Maroc, 20360 Casablanca, Morocco
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20
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Fasquelle L, Scott HS, Lenoir M, Wang J, Rebillard G, Gaboyard S, Venteo S, François F, Mausset-Bonnefont AL, Antonarakis SE, Neidhart E, Chabbert C, Puel JL, Guipponi M, Delprat B. Tmprss3, a transmembrane serine protease deficient in human DFNB8/10 deafness, is critical for cochlear hair cell survival at the onset of hearing. J Biol Chem 2011; 286:17383-97. [PMID: 21454591 DOI: 10.1074/jbc.m110.190652] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Mutations in the type II transmembrane serine protease 3 (TMPRSS3) gene cause non-syndromic autosomal recessive deafness (DFNB8/10), characterized by congenital or childhood onset bilateral profound hearing loss. In order to explore the physiopathology of TMPRSS3 related deafness, we have generated an ethyl-nitrosourea-induced mutant mouse carrying a protein-truncating nonsense mutation in Tmprss3 (Y260X) and characterized the functional and histological consequences of Tmprss3 deficiency. Auditory brainstem response revealed that wild type and heterozygous mice have normal hearing thresholds up to 5 months of age, whereas Tmprss3(Y260X) homozygous mutant mice exhibit severe deafness. Histological examination showed degeneration of the organ of Corti in adult mutant mice. Cochlear hair cell degeneration starts at the onset of hearing, postnatal day 12, in the basal turn and progresses very rapidly toward the apex, reaching completion within 2 days. Given that auditory and vestibular deficits often co-exist, we evaluated the balancing abilities of Tmprss3(Y260X) mice by using rotating rod and vestibular behavioral tests. Tmprss3(Y260X) mice effectively displayed mild vestibular syndrome that correlated histologically with a slow degeneration of saccular hair cells. In situ hybridization in the developing inner ear showed that Tmprss3 mRNA is localized in sensory hair cells in the cochlea and the vestibule. Our results show that Tmprss3 acts as a permissive factor for cochlear hair cells survival and activation at the onset of hearing and is required for saccular hair cell survival. This mouse model will certainly help to decipher the molecular mechanisms underlying DFNB8/10 deafness and cochlear function.
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Affiliation(s)
- Lydie Fasquelle
- INSERM U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
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21
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Ruel J, Emery S, Nouvian R, Bersot T, Amilhon B, Van Rybroek JM, Rebillard G, Lenoir M, Eybalin M, Delprat B, Sivakumaran TA, Giros B, El Mestikawy S, Moser T, Smith RJ, Lesperance MM, Puel JL. Impairment of SLC17A8 encoding vesicular glutamate transporter-3, VGLUT3, underlies nonsyndromic deafness DFNA25 and inner hair cell dysfunction in null mice. Am J Hum Genet 2008; 83:278-92. [PMID: 18674745 PMCID: PMC2495073 DOI: 10.1016/j.ajhg.2008.07.008] [Citation(s) in RCA: 177] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Revised: 06/20/2008] [Accepted: 07/11/2008] [Indexed: 11/27/2022] Open
Abstract
Autosomal-dominant sensorineural hearing loss is genetically heterogeneous, with a phenotype closely resembling presbycusis, the most common sensory defect associated with aging in humans. We have identified SLC17A8, which encodes the vesicular glutamate transporter-3 (VGLUT3), as the gene responsible for DFNA25, an autosomal-dominant form of progressive, high-frequency nonsyndromic deafness. In two unrelated families, a heterozygous missense mutation, c.632C-->T (p.A211V), was found to segregate with DFNA25 deafness and was not present in 267 controls. Linkage-disequilibrium analysis suggested that the families have a distant common ancestor. The A211 residue is conserved in VGLUT3 across species and in all human VGLUT subtypes (VGLUT1-3), suggesting an important functional role. In the cochlea, VGLUT3 accumulates glutamate in the synaptic vesicles of the sensory inner hair cells (IHCs) before releasing it onto receptors of auditory-nerve terminals. Null mice with a targeted deletion of Slc17a8 exon 2 lacked auditory-nerve responses to acoustic stimuli, although auditory brainstem responses could be elicited by electrical stimuli, and robust otoacoustic emissions were recorded. Ca(2+)-triggered synaptic-vesicle turnover was normal in IHCs of Slc17a8 null mice when probed by membrane capacitance measurements at 2 weeks of age. Later, the number of afferent synapses, spiral ganglion neurons, and lateral efferent endings below sensory IHCs declined. Ribbon synapses remaining by 3 months of age had a normal ultrastructural appearance. We conclude that deafness in Slc17a8-deficient mice is due to a specific defect of vesicular glutamate uptake and release and that VGLUT3 is essential for auditory coding at the IHC synapse.
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Affiliation(s)
- Jérôme Ruel
- Inserm U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
- Université Montpellier 1, 34091 Montpellier, France
| | - Sarah Emery
- Division of Pediatric Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, University of Michigan Health System, Ann Arbor, MI 48109-5241, USA
| | - Régis Nouvian
- InnerEarLab, Department of Otolaryngology and Center for Molecular Physiology of the Brain, University of Goettingen Medical School, Goettingen 37075, Germany
| | - Tiphaine Bersot
- Inserm U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
- Université Montpellier 1, 34091 Montpellier, France
| | | | - Jana M. Van Rybroek
- Department of Otolaryngology and Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Guy Rebillard
- Inserm U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
- Université Montpellier 1, 34091 Montpellier, France
| | - Marc Lenoir
- Inserm U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
- Université Montpellier 1, 34091 Montpellier, France
| | - Michel Eybalin
- Inserm U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
- Université Montpellier 1, 34091 Montpellier, France
| | - Benjamin Delprat
- Inserm U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
- Université Montpellier 1, 34091 Montpellier, France
| | - Theru A. Sivakumaran
- Division of Pediatric Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, University of Michigan Health System, Ann Arbor, MI 48109-5241, USA
| | - Bruno Giros
- Inserm U 513, 9 Quai Saint Bernard, 75252 Paris, France
| | | | - Tobias Moser
- InnerEarLab, Department of Otolaryngology and Center for Molecular Physiology of the Brain, University of Goettingen Medical School, Goettingen 37075, Germany
- Bernstein Center for Computational Neuroscience, University of Goettingen, Goettingen 37075, Germany
| | - Richard J.H. Smith
- Department of Otolaryngology and Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Marci M. Lesperance
- Division of Pediatric Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, University of Michigan Health System, Ann Arbor, MI 48109-5241, USA
| | - Jean-Luc Puel
- Inserm U 583, Institut des Neurosciences, Hôpital Saint Eloi, 34091 Montpellier, France
- Université Montpellier 1, 34091 Montpellier, France
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22
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Abstract
The exquisite sensitivity of the cochlea, which mediates the transduction of sound waves into nerve impulses, depends on the endolymph ionic composition and the endocochlear potential. A key protein in the maintenance of the electrochemical composition of the endolymph is the Na,K-ATPase. In this study, we have looked for the presence in the rat inner ear of members of the FXYD protein family, recently identified as tissue-specific modulators of Na,K-ATPase. Only FXYD6 is detected at the protein level. FXYD6 is expressed in various epithelial cells bordering the endolymph space and in the auditory neurons. FXYD6 co-localizes with Na,K-ATPase in the stria vascularis and can be co-immunoprecipitated with Na,K-ATPase. After expression in Xenopus oocytes, FXYD6 associates with Na,K-ATPase alpha1-beta1 and alpha1-beta2 isozymes, which are preferentially expressed in different regions of the inner ear and also with gastric and non-gastric H,K-ATPases. The apparent K(+) and Na(+) affinities of alpha1-beta1 and alpha1-beta2 isozymes are different. Association of FXYD6 with Na,K-ATPase alpha1-beta1 isozymes slightly decreases their apparent K(+) affinity and significantly decreases their apparent Na(+) affinity. On the other hand, association with alpha1-beta2 isozymes increases their apparent K(+) and Na(+) affinity. The effects of FXYD6 on the apparent Na(+) affinity of Na,K-ATPase and the voltage dependence of its K(+) effect are distinct from other FXYD proteins. In conclusion, this study defines the last FXYD protein of unknown function as a modulator of Na,K-ATPase. Among FXYD protein, FXYD6 is unique in its expression in the inner ear, suggesting a role in endolymph composition.
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Affiliation(s)
- Benjamin Delprat
- Department of Pharmacology and Toxicology, University of Lausanne, Rue du Bugnon 27, 1005 Lausanne, Switzerland
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23
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Delprat B, Puel JL, Geering K. Dynamic expression of FXYD6 in the inner ear suggests a role of the protein in endolymph homeostasis and neuronal activity. Dev Dyn 2007; 236:2534-40. [PMID: 17676640 DOI: 10.1002/dvdy.21269] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
A key protein in the production and in the maintenance of the endocochlear potential is the Na,K-ATPase. Previously, we have shown that FXYD6 is a modulator of the Na,K-ATPase expressed in the inner ear (Delprat et al. [2007] J Biol Chem 282:7450-7456). To investigate the potential role of FXYD6 in inner ear function, we studied the developmental expression of FXYD6. Reverse transcriptase-polymerase chain reaction analysis demonstrates that FXYD6 is present as two splice variants. Both variants coimmunoprecipitate with Na,K-ATPase after expression in Xenopus oocytes. Immunohistochemistry of the cochlea (from birth to postnatal day 30) shows that FXYD6 is expressed in several epithelial cells important for endolymph homeostasis. Marked similarities were found in the developmental expression patterns of FXYD6 and Na,K-ATPase, suggesting functional cooperation between the two proteins in the generation and maintenance of the endocochlear potential and ion composition of the endolymph.
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Affiliation(s)
- Benjamin Delprat
- Department of Pharmacology and Toxicology, University of Lausanne, Lausanne, Switzerland
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24
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Abstract
Members of the FXYD protein family are small membrane proteins which are characterized by an FXYD motif, two conserved glycines and a serine residue. FXYD proteins show a tissue-specific distribution. Recent evidence suggests that 6 out of 7 FXYD proteins, FXYD1 (phospholemman), FXYD2 (gamma subunit of Na,K-ATPase), FXYD3 (Mat-8), FXYD4 (CHIF), FXYD5 (Ric) and FXYD7 associate with Na,K-ATPase and modulate its transport properties e.g. its Na+ and/or its K+ affinity in a distinct way. These results highlight the complex regulation of Na+ and K+ transport which is necessary to ensure proper tissue functions such as renal Na+-reabsorption, muscle contractility and neuronal excitability. Moreover, mutation of a conserved glycine residue into an arginine residue in FXYD2 has been linked to cases of human hypomagnesemia indicating that dysregulation of Na,K-ATPase by FXYD proteins may be implicated in pathophysiological states. A better characterization of this novel regulatory mechanism of Na,K-ATPase may help to better understand its role in physiological and pathophysiological conditions.
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Affiliation(s)
- Benjamin Delprat
- Département de Pharmacologie et Toxicologie, Université de Lausanne, rue du Bugnon 27, 1005 Lausanne, Suisse
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25
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Adato A, Lefèvre G, Delprat B, Michel V, Michalski N, Chardenoux S, Weil D, El-Amraoui A, Petit C. Usherin, the defective protein in Usher syndrome type IIA, is likely to be a component of interstereocilia ankle links in the inner ear sensory cells. Hum Mol Genet 2005; 14:3921-32. [PMID: 16301217 DOI: 10.1093/hmg/ddi416] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Usher syndrome type IIa (USH2A) combines moderate to severe congenital hearing impairment and retinitis pigmentosa. It is the most common genetic form of USH. USH2A encodes usherin, which was previously defined as a basement membrane protein. A much larger USH2A transcript predicted to encode a transmembrane (TM) isoform was recently reported. Here, we address the role of TM usherin in the inner ear. Analysis of the usherin alternative transcripts in the murine inner ear revealed the existence of several predicted TM usherin isoforms with modular ectodomains of different lengths. In addition, we identified in the usherin cytoplasmic region a predicted 24 amino acid peptide, derived from a newly defined exon that is predominantly expressed in the inner ear but not in the retina. In mouse and rat inner ears, we show that TM usherin is present at the base of the differentiating stereocilia, which make up the mechanosensitive hair bundles receptive to sound. The usherin immunolabeling is transient in the hair bundles of cochlear hair cells (HCs), but persists in mature hair bundles of vestibular HCs. Several lines of evidence support the involvement of TM usherin in the composition of the ankle links, a subset of filamentous lateral links connecting stereocilia at the base. By co-immunoprecipitation and in vitro binding assays, we establish that the usherin cytodomain can bind to whirlin and harmonin, two PDZ domain-containing proteins that are defective in genetic forms of isolated deafness and USH type I, respectively. These PDZ proteins are suitable to provide the anchoring of interstereocilia lateral links to the F-actin core of stereocilia. Our results strongly suggest that congenital deafness in USH type I and type II shares similar pathogenic mechanisms, i.e. the disruption of hair bundle links-mediated adhesion forces that are essential for the proper organization of growing hair bundles.
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Affiliation(s)
- Avital Adato
- Unité de Génétique des Déficits Sensoriels, INSERM U587, Institut Pasteur, Paris, France
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26
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Delprat B, Ruel J, Guitton MJ, Hamard G, Lenoir M, Pujol R, Puel JL, Brabet P, Hamel CP. Deafness and cochlear fibrocyte alterations in mice deficient for the inner ear protein otospiralin. Mol Cell Biol 2005; 25:847-53. [PMID: 15632083 PMCID: PMC543414 DOI: 10.1128/mcb.25.2.847-853.2005] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In the cochlea, the mammalian auditory organ, fibrocytes of the mesenchymal nonsensory regions play important roles in cochlear physiology, including the maintenance of ionic and hydric components in the endolymph. Occurrence of human deafness in fibrocyte alterations underlines their critical roles in auditory function. We recently described a novel gene, Otos, which encodes otospiralin, a small protein of unknown function that is produced by the fibrocytes of the cochlea and vestibule. We now have generated mice with deletion of Otos and found that they show moderate deafness, with no frequency predominance. Histopathology revealed a degeneration of type II and IV fibrocytes, while hair cells and stria vascularis appeared normal. Together, these findings suggest that impairment of fibrocytes caused by the loss in otospiralin leads to abnormal cochlear physiology and auditory function. This moderate dysfunction may predispose to age-related hearing loss.
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Affiliation(s)
- Benjamin Delprat
- INSERM U.583, Physiopathologie et Thérapie des Déficits Sensoriels et Moteurs, Institut des Neurosciences de Montpellier, Hôpital Saint-Eloi, BP 74103, 80, rue Augustin Fliche, 34295 Montpellier cedex 05, France.
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27
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Delprat B, Michel V, Goodyear R, Yamasaki Y, Michalski N, El-Amraoui A, Perfettini I, Legrain P, Richardson G, Hardelin JP, Petit C. Myosin XVa and whirlin, two deafness gene products required for hair bundle growth, are located at the stereocilia tips and interact directly. Hum Mol Genet 2004; 14:401-10. [PMID: 15590698 DOI: 10.1093/hmg/ddi036] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Defects in myosin XVa and the PDZ domain-containing protein, whirlin, underlie deafness in humans and mice. Hair bundles of mutant mice defective for either protein have abnormally short stereocilia. Here, we show that whirlin, like myosin XVa, is present at the very tip of each stereocilium in the developing and mature hair bundles of the cochlear and vestibular system. We found that myosin XVa SH3-MyTH4 region binds to the short isoform of whirlin (PR-PDZ3) that can rescue the stereocilia growth defect in whirlin defective mice. Moreover, the C-terminal MyTH4-FERM region of myosin XVa binds to the PDZ1 and PDZ2 domains of the long whirlin isoform. We conclude that a direct myosin XVa-whirlin interaction at the stereocilia tip is likely to control the elongation of stereocilia. Whirlin, unlike myosin XVa, is also transiently localized in the basal region of developing stereocilia in rat vestibular and cochlear hair cells until P4 and P12, respectively. Notably, whirlin also interacts with myosin VIIa that is present along the entire length of the stereocilia. Finally, we show that the transmembrane netrin-G1 ligand (NGL-1) binds to the PDZ1 and PDZ2 domains of whirlin and has an extracellular region that homophilically self-interacts in a Ca2+-dependent manner. The interaction between whirlin and NGL-1 might be involved in the stabilization of interstereociliar links.
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Affiliation(s)
- Benjamin Delprat
- Unité de Génétique des Déficits Sensoriels, INSERM U587, Institut Pasteur, 25 rue du Dr Roux, 75724 Paris, cedex 15, France
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28
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Lavigne-Rebillard M, Delprat B, Surget MO, Griffoin JM, Weil D, Arbones M, Vincent R, Hamel CP. Gene structure, chromosomal localization, and mutation screening of the human gene for the inner ear protein otospiralin. Neurogenetics 2003; 4:137-40. [PMID: 12687421 DOI: 10.1007/s10048-003-0145-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2003] [Accepted: 02/17/2003] [Indexed: 10/25/2022]
Abstract
Otospiralin is a novel protein of unknown function that is produced by non-sensory cells (fibrocytes) of the inner ear (cochlea and vestibule). We showed that downregulation of otospiralin in guinea pigs leads to deafness and we therefore hypothesized that genetic defects in the otospiralin gene could also cause deafness in humans. In this study, we cloned and localized OTOSP, the human gene for otospiralin. OTOSP spans 1630 nucleotides, contains four exons and codes for a 567-nucleotide cDNA. By fluorescence in situ hybridization and hybrid panel mapping we localized OTOSP on chromosome 2 at position q37.3. There is currently no deafness family linked to this region. We screened OTOSP for mutations in 410 unrelated patients exhibiting various levels of hearing loss. Beside intronic polymorphisms, a rare variant (Pro7Leu) was found in 4 deafness patients and 3 control individuals, indicating that this change is not involved in this condition and excluding OTOSP as a major gene for genetic deafness.
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Affiliation(s)
- Mireille Lavigne-Rebillard
- Physiopathologie et Thérapie des Déficits Sensoriels et Moteurs, INSERM U 583, 71 rue de Navacelles, 34090 Montpellier, France
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29
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Delprat B, Boulanger A, Wang J, Beaudoin V, Guitton MJ, Ventéo S, Dechesne CJ, Pujol R, Lavigne-Rebillard M, Puel JL, Hamel CP. Downregulation of otospiralin, a novel inner ear protein, causes hair cell degeneration and deafness. J Neurosci 2002; 22:1718-25. [PMID: 11880501 PMCID: PMC6758878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
Mesenchymal nonsensory regions of the inner ear are important structures surrounding the neurosensory epithelium that are believed to participate in the ionic homeostasis of the cochlea and vestibule. We report here the discovery of otospiralin, an inner ear-specific protein that is produced by fibrocytes from these regions, including the spiral ligament and spiral limbus in the cochlea and the maculae and semicircular canals in the vestibule. Otospiralin is a novel 6.4 kDa protein of unknown function that shares a protein motif with the gag p30 core shell nucleocapsid protein of type C retroviruses. To evaluate its functional importance, we downregulated otospiralin by cochlear perfusion of antisense oligonucleotides in guinea pigs. This led to a rapid threshold elevation of the compound action potentials and irreversible deafness. Cochlear examination by transmission electron microscopy revealed hair cell loss and degeneration of the organ of Corti. This demonstrates that otospiralin is essential for the survival of the neurosensory epithelium.
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MESH Headings
- Acoustic Stimulation
- Action Potentials/drug effects
- Amino Acid Motifs/genetics
- Animals
- Auditory Threshold/drug effects
- Cell Survival/drug effects
- Cochlea/drug effects
- Cochlea/metabolism
- Cochlea/pathology
- Cochlear Nerve/physiology
- Deafness/chemically induced
- Deafness/metabolism
- Deafness/pathology
- Down-Regulation/drug effects
- Down-Regulation/physiology
- Ear, Inner/drug effects
- Ear, Inner/metabolism
- Ear, Inner/pathology
- Fibroblasts/metabolism
- Guinea Pigs
- Hair Cells, Auditory/drug effects
- Hair Cells, Auditory/metabolism
- Hair Cells, Auditory/pathology
- Humans
- Immunohistochemistry
- In Situ Hybridization
- Mice
- Microscopy, Electron
- Molecular Sequence Data
- Oligonucleotides, Antisense/pharmacology
- Organ Specificity
- Otoacoustic Emissions, Spontaneous/drug effects
- Protein Biosynthesis
- Proteins/antagonists & inhibitors
- Proteins/genetics
- RNA, Messenger/metabolism
- Rats
- Sequence Homology, Amino Acid
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Affiliation(s)
- Benjamin Delprat
- Institut National de la Santé et de la Recherche Médicale U. 254, Laboratoire de Neurobiologie de l'Audition, 34090 Montpellier, France
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30
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Keller N, Durand J, Laumont G, Delprat B, Pouliquen Y. P 413 Eye “degenerative evolution” in the Chinese cavefish: Triplophysa xiangxiensis Y. Vision Res 1995. [DOI: 10.1016/0042-6989(95)90673-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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