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Hosseinpour S, Bemanalizadeh M, Mohammadi P, Ashrafi MR, Heidari M. An overview of early-onset cerebellar ataxia: a practical guideline. Acta Neurol Belg 2024:10.1007/s13760-024-02595-w. [PMID: 38951452 DOI: 10.1007/s13760-024-02595-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Accepted: 06/18/2024] [Indexed: 07/03/2024]
Abstract
Early onset ataxias (EOAs) are a heterogeneous group of rare neurological disorders that not only involve the central and peripheral nervous system but also involve other organs. They are mainly manifested by degeneration or abnormal development of the cerebellum occurring before the age of 25 years and typically the pattern of inheritance is autosomal recessive.The diagnosis of autosomal recessive cerebellar ataxias (ARCAs) is confirmed by the clinical, laboratory, electrophysiological examination, neuroimaging findings, and mutation analysis when the causative gene is detected. Correct diagnosis is crucial for appropriate genetic counseling, estimating the prognosis, and, in some cases, pharmacological intervention. The wide variety of genotypes with a heterogeneous phenotypic manifestation makes the diagnostic work-up challenging, time-consuming, and expensive, not only for the clinician but also for the children and their parents. In this review, we focused on the step-by-step approach in which cerebellar ataxia is a prominent sign. We also outline the most common disorders in ataxias with early-onset manifestations.
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Affiliation(s)
- Sareh Hosseinpour
- Department of Pediatrics, Division of Pediatric Neurology, Vali-e-Asr Hospital, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
- Department of Pediatrics, Division of Pediatric Neurology, Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, No. 61, Gharib Street, Keshavarz Blvd, Tehran, 1419733151, Iran
| | - Maryam Bemanalizadeh
- Department of Pediatrics, Division of Pediatric Neurology, Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, No. 61, Gharib Street, Keshavarz Blvd, Tehran, 1419733151, Iran
- Child Growth and Development Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Pouria Mohammadi
- Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mahmoud Reza Ashrafi
- Department of Pediatrics, Division of Pediatric Neurology, Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, No. 61, Gharib Street, Keshavarz Blvd, Tehran, 1419733151, Iran.
- Growth and Development Research Center, Tehran University of Medical Sciences, Tehran, Iran.
- Pediatric Cell and Gene Therapy Research Center, Tehran University of Medical Sciences, Tehran, Iran.
| | - Morteza Heidari
- Department of Pediatrics, Division of Pediatric Neurology, Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, No. 61, Gharib Street, Keshavarz Blvd, Tehran, 1419733151, Iran.
- Growth and Development Research Center, Tehran University of Medical Sciences, Tehran, Iran.
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2
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Gapińska M, Zajko W, Skowronek K, Figiel M, Krawczyk P, Egorov A, Dziembowski A, Johansson MO, Nowotny M. Structure-functional characterization of Lactococcus AbiA phage defense system. Nucleic Acids Res 2024; 52:4723-4738. [PMID: 38587192 PMCID: PMC11077055 DOI: 10.1093/nar/gkae230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 02/01/2024] [Accepted: 03/20/2024] [Indexed: 04/09/2024] Open
Abstract
Bacterial reverse transcriptases (RTs) are a large and diverse enzyme family. AbiA, AbiK and Abi-P2 are abortive infection system (Abi) RTs that mediate defense against bacteriophages. What sets Abi RTs apart from other RT enzymes is their ability to synthesize long DNA products of random sequences in a template- and primer-independent manner. Structures of AbiK and Abi-P2 representatives have recently been determined, but there are no structural data available for AbiA. Here, we report the crystal structure of Lactococcus AbiA polymerase in complex with a single-stranded polymerization product. AbiA comprises three domains: an RT-like domain, a helical domain that is typical for Abi polymerases, and a higher eukaryotes and prokaryotes nucleotide-binding (HEPN) domain that is common for many antiviral proteins. AbiA forms a dimer that distinguishes it from AbiK and Abi-P2, which form trimers/hexamers. We show the DNA polymerase activity of AbiA in an in vitro assay and demonstrate that it requires the presence of the HEPN domain which is enzymatically inactive. We validate our biochemical and structural results in vivo through bacteriophage infection assays. Finally, our in vivo results suggest that AbiA-mediated phage defense may not rely on AbiA-mediated cell death.
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Affiliation(s)
- Marta Gapińska
- Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, Warsaw, Poland
| | - Weronika Zajko
- Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, Warsaw, Poland
| | - Krzysztof Skowronek
- Biophysics Core Facility, International Institute of Molecular and Cell Biology, Warsaw, Poland
| | - Małgorzata Figiel
- Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, Warsaw, Poland
| | - Paweł S Krawczyk
- Laboratory of RNA Biology, International Institute of Molecular and Cell Biology, Warsaw, Poland
| | - Artyom A Egorov
- Department of Experimental Medical Science, Lund University, 221 00 Lund, Sweden
| | - Andrzej Dziembowski
- Laboratory of RNA Biology, International Institute of Molecular and Cell Biology, Warsaw, Poland
| | - Marcus J O Johansson
- Department of Experimental Medical Science, Lund University, 221 00 Lund, Sweden
| | - Marcin Nowotny
- Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, Warsaw, Poland
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3
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van Asperen JV, Kotaich F, Caillol D, Bomont P. Neurofilaments: Novel findings and future challenges. Curr Opin Cell Biol 2024; 87:102326. [PMID: 38401181 DOI: 10.1016/j.ceb.2024.102326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 01/07/2024] [Indexed: 02/26/2024]
Abstract
Neurofilaments (NFs) are abundant cytoskeletal proteins that emerge as a critical hub for cell signalling within neurons. As we start to uncover essential roles of NFs in regulating microtubule and organelle dynamics, nerve conduction and neurotransmission, novel discoveries are expected to arise in genetics, with NFs identified as causal genes for various neurodegenerative diseases. This review will discuss how the latest advances in fundamental and translational research illuminate our understanding of NF biology, particularly their assembly, organisation, transport and degradation. We will emphasise the notion that filaments are not one entity and that future challenges will be to apprehend their diverse composition and structural heterogeneity and to scrutinize how this regulates signalling, sustains neuronal physiology and drives pathophysiology in disease.
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Affiliation(s)
- Jessy V van Asperen
- ERC Team, NeuroMyoGene Insitute, INMG-PGNM, Inserm U1315, CNRS UMR5261, University of Lyon 1, Lyon, France
| | - Farah Kotaich
- ERC Team, NeuroMyoGene Insitute, INMG-PGNM, Inserm U1315, CNRS UMR5261, University of Lyon 1, Lyon, France
| | - Damien Caillol
- ERC Team, NeuroMyoGene Insitute, INMG-PGNM, Inserm U1315, CNRS UMR5261, University of Lyon 1, Lyon, France
| | - Pascale Bomont
- ERC Team, NeuroMyoGene Insitute, INMG-PGNM, Inserm U1315, CNRS UMR5261, University of Lyon 1, Lyon, France.
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4
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Ekenstedt KJ, Minor KM, Shelton GD, Hammond JJ, Miller AD, Taylor SM, Huang Y, Mickelson JR. A SACS deletion variant in Great Pyrenees dogs causes autosomal recessive neuronal degeneration. Hum Genet 2023; 142:1587-1601. [PMID: 37758910 PMCID: PMC10602964 DOI: 10.1007/s00439-023-02599-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Accepted: 09/04/2023] [Indexed: 09/29/2023]
Abstract
ARSACS (autosomal recessive spastic ataxia of Charlevoix-Saguenay) is a human neurological disorder characterized by progressive cerebellar ataxia and peripheral neuropathy. A recently recognized disorder in Great Pyrenees dogs is similarly characterized by widespread central nervous system degeneration leading to progressive cerebellar ataxia and spasticity, combined with peripheral neuropathy. Onset of clinical signs occurred in puppies as young as 4 months of age, with slow progression over several years. A multi-generation pedigree suggested an autosomal recessive mode of inheritance. Histopathology revealed consistent cerebellar Purkinje cell degeneration, neuronal degeneration in brainstem nuclei, widespread spinal cord white matter degeneration, ganglion cell degeneration, inappropriately thin myelin sheaths or fully demyelinated peripheral nerve fibers, and normal or only mild patterns of denervation atrophy in skeletal muscles. Genome-wide single nucleotide polymorphism (SNP) genotype data was collected from 6 cases and 26 controls, where homozygosity mapping identified a 3.3 Mb region on CFA25 in which all cases were homozygous and all controls were either heterozygous or homozygous for alternate haplotypes. This region tagged the SACS gene where variants are known to cause ARSACS. Sanger sequencing of SACS in affected dogs identified a 4 bp deletion that causes a frame shift and truncates 343 amino acids from the C terminus of the encoded sacsin protein (p.Val4244AlafsTer32). Our clinical and histopathological descriptions of this canine disorder contribute to the description of human ARSACS and represents the first naturally occurring large animal model of this disorder.
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Affiliation(s)
- Kari J Ekenstedt
- Department of Basic Medical Sciences, College of Veterinary Medicine, Purdue University, Lynn Hall, 625 Harrison Street, West Lafayette, IN, 47907, USA.
| | - Katie M Minor
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, 55108, USA
| | - G Diane Shelton
- Department of Pathology, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - James J Hammond
- Department of Neurology, Pieper Memorial Veterinary Center, Middletown, CT, 06457, USA
| | - Andrew D Miller
- Section of Anatomic Pathology, Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA
| | - Susan M Taylor
- Department of Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Yanyun Huang
- Prairie Diagnostic Services, Inc., Saskatoon, SK, S7N 5B4, Canada
| | - James R Mickelson
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, 55108, USA
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5
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Dragan M, Chen Z, Li Y, Le J, Sun P, Haensel D, Sureshchandra S, Pham A, Lu E, Pham KT, Verlande A, Vu R, Gutierrez G, Li W, Jang C, Masri S, Dai X. Ovol1/2 loss-induced epidermal defects elicit skin immune activation and alter global metabolism. EMBO Rep 2023; 24:e56214. [PMID: 37249012 PMCID: PMC10328084 DOI: 10.15252/embr.202256214] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 04/29/2023] [Accepted: 05/10/2023] [Indexed: 05/31/2023] Open
Abstract
Skin epidermis constitutes the outer permeability barrier that protects the body from dehydration, heat loss, and myriad external assaults. Mechanisms that maintain barrier integrity in constantly challenged adult skin and how epidermal dysregulation shapes the local immune microenvironment and whole-body metabolism remain poorly understood. Here, we demonstrate that inducible and simultaneous ablation of transcription factor-encoding Ovol1 and Ovol2 in adult epidermis results in barrier dysregulation through impacting epithelial-mesenchymal plasticity and inflammatory gene expression. We find that aberrant skin immune activation then ensues, featuring Langerhans cell mobilization and T cell responses, and leading to elevated levels of secreted inflammatory factors in circulation. Finally, we identify failure to gain body weight and accumulate body fat as long-term consequences of epidermal-specific Ovol1/2 loss and show that these global metabolic changes along with the skin barrier/immune defects are partially rescued by immunosuppressant dexamethasone. Collectively, our study reveals key regulators of adult barrier maintenance and suggests a causal connection between epidermal dysregulation and whole-body metabolism that is in part mediated through aberrant immune activation.
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Affiliation(s)
- Morgan Dragan
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
- The NSF‐Simons Center for Multiscale Cell Fate ResearchUniversity of CaliforniaIrvineCAUSA
| | - Zeyu Chen
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
- Present address:
Department of Dermatology, Shanghai Tenth People's HospitalTongji University School of MedicineShanghaiChina
- Present address:
Institute of PsoriasisTongji University School of MedicineShanghaiChina
| | - Yumei Li
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Johnny Le
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Peng Sun
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Daniel Haensel
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
- Present address:
Program in Epithelial BiologyStanford University School of MedicineStanfordCAUSA
| | - Suhas Sureshchandra
- Department of Physiology and Biophysics, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Anh Pham
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Eddie Lu
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Katherine Thanh Pham
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Amandine Verlande
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Remy Vu
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
- The NSF‐Simons Center for Multiscale Cell Fate ResearchUniversity of CaliforniaIrvineCAUSA
| | - Guadalupe Gutierrez
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Wei Li
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Cholsoon Jang
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Selma Masri
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
| | - Xing Dai
- Department of Biological Chemistry, School of MedicineUniversity of CaliforniaIrvineCAUSA
- The NSF‐Simons Center for Multiscale Cell Fate ResearchUniversity of CaliforniaIrvineCAUSA
- Department of Dermatology, School of MedicineUniversity of CaliforniaIrvineCAUSA
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6
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Márquez BT, Leung TCS, Hui J, Charron F, McKinney RA, Watt AJ. A mitochondrial-targeted antioxidant (MitoQ) improves motor coordination and reduces Purkinje cell death in a mouse model of ARSACS. Neurobiol Dis 2023; 183:106157. [PMID: 37209925 DOI: 10.1016/j.nbd.2023.106157] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 05/10/2023] [Accepted: 05/17/2023] [Indexed: 05/22/2023] Open
Abstract
Mitochondrial deficits have been observed in animal models of Autosomal-recessive spastic ataxia of the Charlevoix-Saguenay (ARSACS) and in patient-derived fibroblasts. We investigated whether mitochondrial function could be restored in Sacs-/- mice, a mouse model of ARSACS, using the mitochondrial-targeted antioxidant ubiquinone MitoQ. After 10 weeks of chronic MitoQ administration in drinking water, we partially reversed motor coordination deficits in Sacs-/- mice but did not affect litter-matched wild-type control mice. MitoQ administration led to a restoration of superoxide dismutase 2 (SOD2) in cerebellar Purkinje cell somata without altering Purkinje cell firing deficits. Purkinje cells in anterior vermis of Sacs-/- mice normally undergo cell death in ARSACS; however, Purkinje cells numbers were elevated after chronic MitoQ treatment. Furthermore, Purkinje cell innervation of target neurons in the cerebellar nuclei of Sacs-/- mice were also partially restored with MitoQ treatment. Our data suggest that MitoQ is a potential therapeutic treatment for ARSACS and that it improves motor coordination via increasing cerebellar Purkinje cell mitochondria function and reducing Purkinje cell death.
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Affiliation(s)
| | | | - Jeanette Hui
- Department of Biology, McGill University, Montreal, QC, Canada
| | - François Charron
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - R Anne McKinney
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada.
| | - Alanna J Watt
- Department of Biology, McGill University, Montreal, QC, Canada.
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7
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Perna L, Castelli M, Frasnetti E, Romano LEL, Colombo G, Prodromou C, Chapple JP. AlphaFold predicted structure of the Hsp90-like domains of the neurodegeneration linked protein sacsin reveals key residues for ATPase activity. Front Mol Biosci 2023; 9:1074714. [PMID: 36710881 PMCID: PMC9880540 DOI: 10.3389/fmolb.2022.1074714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 12/28/2022] [Indexed: 01/15/2023] Open
Abstract
The ataxia-linked protein sacsin has three regions of partial homology to Hsp90's N-terminal ATP binding domain. Although a crystal structure for this Hsp90-like domain has been reported the precise molecular interactions required for ATP-binding and hydrolysis are unclear and it is debatable whether ATP biding is compatible with these domains. Furthermore, the Identification of a sacsin domain(s) equivalent to the middle domain of Hsp90 has been elusive. Here we present the superimposition of an AlphaFold structure of sacsin with yeast Hsp90, which provides novel insights into sacsin's structure. We identify residues within the sacsin Hsp90-like domains that are required for ATP binding and hydrolysis, including the putative catalytic arginine residues equivalent to that of the Hsp90 middle domain. Importantly, our analysis allows comparison of the Hsp90 middle domain with corresponding sacsin regions and identifies a shorter lid segment, in the sacsin ATP-binding domains, than the one found in the N-terminal domain of Hsp90. Our results show how a realignment of residues in the lid segment of sacsin that are involved in ATP binding can better match equivalent residues seen in Hsp90, which we then corroborated using molecular dynamic simulations. We speculate, from a structural viewpoint, why some ATP competitive inhibitors of Hsp90 may not bind sacsin, while others would. Together our analysis supports the hypothesis that sacsin's function is ATP-driven and would be consistent with it having a role as a super molecular chaperone. We propose that the SR1 regions of sacsin be renamed as HSP-NRD (Hsp90 N-Terminal Repeat Domain; residues 84-324) and the fragment immediately after as HSP-MRD (Hsp90 Middle Repeat Domain; residues 325-518).
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Affiliation(s)
- Laura Perna
- William Harvey Research Institute, Faculty of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom
| | | | | | - Lisa E. L. Romano
- William Harvey Research Institute, Faculty of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom
| | | | - Chrisostomos Prodromou
- Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Brighton, United Kingdom,*Correspondence: J. Paul Chapple, ; Chrisostomos Prodromou,
| | - J. Paul Chapple
- William Harvey Research Institute, Faculty of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom,*Correspondence: J. Paul Chapple, ; Chrisostomos Prodromou,
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8
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Louit A, Beaudet MJ, Blais M, Gros-Louis F, Dupré N, Berthod F. In Vitro Characterization of Motor Neurons and Purkinje Cells Differentiated from Induced Pluripotent Stem Cells Generated from Patients with Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay. Stem Cells Int 2023; 2023:1496597. [PMID: 37096129 PMCID: PMC10122584 DOI: 10.1155/2023/1496597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 04/26/2023] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is an early-onset neurodegenerative disease mainly characterized by spasticity in the lower limbs and poor muscle control. The disease is caused by mutations in the SACS gene leading in most cases to a loss of function of the sacsin protein, which is highly expressed in motor neurons and Purkinje cells. To investigate the impact of the mutated sacsin protein in these cells in vitro, induced pluripotent stem cell- (iPSC-) derived motor neurons and iPSC-derived Purkinje cells were generated from three ARSACS patients. Both types of iPSC-derived neurons expressed the characteristic neuronal markers β3-tubulin, neurofilaments M and H, as well as specific markers like Islet-1 for motor neurons, and parvalbumin or calbindin for Purkinje cells. Compared to controls, iPSC-derived mutated SACS neurons expressed lower amounts of sacsin. In addition, characteristic neurofilament aggregates were detected along the neurites of both iPSC-derived neurons. These results indicate that it is possible to recapitulate in vitro, at least in part, the ARSACS pathological signature in vitro using patient-derived motor neurons and Purkinje cells differentiated from iPSCs. Such an in vitro personalized model of the disease could be useful for the screening of new drugs for the treatment of ARSACS.
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Affiliation(s)
- Aurélie Louit
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Quebec City, Quebec, Canada
| | - Marie-Josée Beaudet
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Quebec City, Quebec, Canada
| | - Mathieu Blais
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Quebec City, Quebec, Canada
| | - François Gros-Louis
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Quebec City, Quebec, Canada
- Department of Surgery, Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
| | - Nicolas Dupré
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Quebec City, Quebec, Canada
- Department of Medicine, Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
| | - François Berthod
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Quebec City, Quebec, Canada
- Department of Surgery, Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
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9
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Østerlund I, Persson S, Nikoloski Z. Tracing and tracking filamentous structures across scales: A systematic review. Comput Struct Biotechnol J 2022; 21:452-462. [PMID: 36618983 PMCID: PMC9804014 DOI: 10.1016/j.csbj.2022.12.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/14/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
Filamentous structures are ubiquitous in nature, are studied in diverse scientific fields, and span vastly different spatial scales. Filamentous structures in biological systems fulfill different functions and often form dynamic networks that respond to perturbations. Therefore, characterizing the properties of filamentous structures and the networks they form is important to gain better understanding of systems level functions and dynamics. Filamentous structures are captured by various imaging technologies, and analysis of the resulting imaging data addresses two problems: (i) identification (tracing) of filamentous structures in a single snapshot and (ii) characterizing the dynamics (i.e., tracking) of filamentous structures over time. Therefore, considerable research efforts have been made in developing automated methods for tracing and tracking of filamentous structures. Here, we provide a systematic review in which we present, categorize, and discuss the state-of-the-art methods for tracing and tracking of filamentous structures in sparse and dense networks. We highlight the mathematical approaches, assumptions, and constraints particular for each method, allowing us to pinpoint outstanding challenges and offer perspectives for future research aimed at gaining better understanding of filamentous structures in biological systems.
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Affiliation(s)
- Isabella Østerlund
- Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg, Denmark,,Bioinformatics, Institute of Biochemistry and Biology, University of Potsdam, 14476 Potsdam, Germany
| | - Staffan Persson
- Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg, Denmark
| | - Zoran Nikoloski
- Bioinformatics, Institute of Biochemistry and Biology, University of Potsdam, 14476 Potsdam, Germany,Systems Biology and Mathematical Modeling, Max Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany,Corresponding author at: Bioinformatics, Institute of Biochemistry and Biology, University of Potsdam, 14476 Potsdam, Germany.
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10
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The J Domain of Sacsin Disrupts Intermediate Filament Assembly. Int J Mol Sci 2022; 23:ijms232415742. [PMID: 36555380 PMCID: PMC9779362 DOI: 10.3390/ijms232415742] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 12/01/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022] Open
Abstract
Autosomal Recessive Spastic Ataxia of the Charlevoix Saguenay (ARSACS) is caused by mutation in the SACS gene resulting in loss of function of the protein sacsin. A key feature is the formation of abnormal bundles of neurofilaments (NF) in neurons and vimentin intermediate filaments (IF) in cultured fibroblasts, suggesting a role of sacsin in IF homeostasis. Sacsin contains a J domain (SacsJ) homologous to Hsp40, that can interact with Hsp70 chaperones. The SacsJ domain resolved NF bundles in cultured Sacs-/- neurons. Having studied the mechanism using NF assembled in vitro from purified NF proteins, we report that the SacsJ domain interacts with NF proteins to disassemble NFL filaments, and to inhibit their initial assembly. A cell-penetrating peptide derived from this domain, SacsJ-myc-TAT was efficient in disassembling NF bundles in cultured Sacs-/- motor neurons, restoring the NF network; however, there was some loss of vimentin IF and NF in cultured Sacs+/+ fibroblasts and motor neurons, respectively. These results suggest that sacsin through its SacsJ domain is a key regulator of NF and vimentin IF networks in cells.
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11
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Aly KA, Moutaoufik MT, Zilocchi M, Phanse S, Babu M. Insights into SACS pathological attributes in autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS)☆. Curr Opin Chem Biol 2022; 71:102211. [PMID: 36126381 DOI: 10.1016/j.cbpa.2022.102211] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/22/2022] [Accepted: 08/10/2022] [Indexed: 01/27/2023]
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a rare early-onset neurodegenerative disease caused by mutations in the SACS gene, encoding Sacsin. Initial functional annotation of Sacsin was based on sequence homology, with subsequent experiments revealing the Sacsin requirement for regulating mitochondrial dynamics, along with its domains involved in promoting neurofilament assembly or resolving their bundling accumulations. ARSACS phenotypes associated with SACS loss-of-function are discussed, and how advancements in ARSACS disease models and quantitative omics approaches can improve our understanding of ARSACS pathological attributes. Lastly in the perspectives section, we address gene correction strategies for monogenic disorders such as ARSACS, along with their common delivery methods, representing a hopeful area for ARSACS therapeutics development.
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Affiliation(s)
- Khaled A Aly
- Department of Biochemistry, University of Regina, Regina, Saskatchewan, Canada
| | | | - Mara Zilocchi
- Department of Biochemistry, University of Regina, Regina, Saskatchewan, Canada
| | - Sadhna Phanse
- Department of Biochemistry, University of Regina, Regina, Saskatchewan, Canada
| | - Mohan Babu
- Department of Biochemistry, University of Regina, Regina, Saskatchewan, Canada.
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12
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Romano LEL, Aw WY, Hixson KM, Novoselova TV, Havener TM, Howell S, Taylor-Blake B, Hall CL, Xing L, Beri J, Nethisinghe S, Perna L, Hatimy A, Altadonna GC, Graves LM, Herring LE, Hickey AJ, Thalassinos K, Chapple JP, Wolter JM. Multi-omic profiling reveals the ataxia protein sacsin is required for integrin trafficking and synaptic organization. Cell Rep 2022; 41:111580. [PMID: 36323248 PMCID: PMC9647044 DOI: 10.1016/j.celrep.2022.111580] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 06/30/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a childhood-onset cerebellar ataxia caused by mutations in SACS, which encodes the protein sacsin. Cellular ARSACS phenotypes include mitochondrial dysfunction, intermediate filament disorganization, and progressive death of cerebellar Purkinje neurons. It is unclear why the loss of sacsin causes these deficits or why they manifest as cerebellar ataxia. Here, we perform multi-omic profiling in sacsin knockout (KO) cells and identify alterations in microtubule dynamics and mislocalization of focal adhesion (FA) proteins, including multiple integrins. Deficits in FA structure, signaling, and function can be rescued by targeting PTEN, a negative regulator of FA signaling. ARSACS mice possess mislocalization of ITGA1 in Purkinje neurons and synaptic disorganization in the deep cerebellar nucleus (DCN). The sacsin interactome reveals that sacsin regulates interactions between cytoskeletal and synaptic adhesion proteins. Our findings suggest that disrupted trafficking of synaptic adhesion proteins is a causal molecular deficit in ARSACS.
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Affiliation(s)
- Lisa E L Romano
- Faculty of Medicine and Dentistry, William Harvey Research Institute, Queen Mary University of London, London EC1M 6BQ, UK
| | - Wen Yih Aw
- UNC Catalyst for Rare Diseases, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Kathryn M Hixson
- UNC Catalyst for Rare Diseases, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Tatiana V Novoselova
- Faculty of Medicine and Dentistry, William Harvey Research Institute, Queen Mary University of London, London EC1M 6BQ, UK; Department of Natural Sciences, Faculty of Science and Technology, Middlesex University, London NW4 4BT, UK
| | - Tammy M Havener
- UNC Catalyst for Rare Diseases, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Stefanie Howell
- UNC Catalyst for Rare Diseases, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Bonnie Taylor-Blake
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Charlotte L Hall
- Faculty of Medicine and Dentistry, William Harvey Research Institute, Queen Mary University of London, London EC1M 6BQ, UK
| | - Lei Xing
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Josh Beri
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; UNC Michael Hooker Proteomics Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Suran Nethisinghe
- Faculty of Medicine and Dentistry, William Harvey Research Institute, Queen Mary University of London, London EC1M 6BQ, UK
| | - Laura Perna
- Faculty of Medicine and Dentistry, William Harvey Research Institute, Queen Mary University of London, London EC1M 6BQ, UK
| | - Abubakar Hatimy
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6BT, UK
| | - Ginevra Chioccioli Altadonna
- Faculty of Medicine and Dentistry, William Harvey Research Institute, Queen Mary University of London, London EC1M 6BQ, UK
| | - Lee M Graves
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6BT, UK; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Laura E Herring
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; UNC Michael Hooker Proteomics Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Anthony J Hickey
- UNC Catalyst for Rare Diseases, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Konstantinos Thalassinos
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6BT, UK; Institute of Structural and Molecular Biology, Birkbeck College, University of London, London WC1E 7HX, UK
| | - J Paul Chapple
- Faculty of Medicine and Dentistry, William Harvey Research Institute, Queen Mary University of London, London EC1M 6BQ, UK.
| | - Justin M Wolter
- UNC Catalyst for Rare Diseases, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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13
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Morani F, Doccini S, Galatolo D, Pezzini F, Soliymani R, Simonati A, Lalowski MM, Gemignani F, Santorelli FM. Integrative Organelle-Based Functional Proteomics: In Silico Prediction of Impaired Functional Annotations in SACS KO Cell Model. Biomolecules 2022; 12:biom12081024. [PMID: 35892334 PMCID: PMC9331974 DOI: 10.3390/biom12081024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 02/07/2023] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is an inherited neurodegenerative disease characterized by early-onset spasticity in the lower limbs, axonal-demyelinating sensorimotor peripheral neuropathy, and cerebellar ataxia. Our understanding of ARSACS (genetic basis, protein function, and disease mechanisms) remains partial. The integrative use of organelle-based quantitative proteomics and whole-genome analysis proposed in the present study allowed identifying the affected disease-specific pathways, upstream regulators, and biological functions related to ARSACS, which exemplify a rationale for the development of improved early diagnostic strategies and alternative treatment options in this rare condition that currently lacks a cure. Our integrated results strengthen the evidence for disease-specific defects related to bioenergetics and protein quality control systems and reinforce the role of dysregulated cytoskeletal organization in the pathogenesis of ARSACS.
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Affiliation(s)
- Federica Morani
- Department of Biology, University of Pisa, 56126 Pisa, Italy; (F.M.); (F.G.)
| | - Stefano Doccini
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit—IRCCS Stella Maris, 56128 Pisa, Italy; (S.D.); (D.G.)
| | - Daniele Galatolo
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit—IRCCS Stella Maris, 56128 Pisa, Italy; (S.D.); (D.G.)
| | - Francesco Pezzini
- Department of Surgery, Dentistry, Paediatrics and Gynaecology, University of Verona, 37129 Verona, Italy; (F.P.); (A.S.)
| | - Rabah Soliymani
- HiLIFE, Meilahti Clinical Proteomics Core Facility, Faculty of Medicine, University of Helsinki, FI-00014 Helsinki, Finland; (R.S.); (M.M.L.)
| | - Alessandro Simonati
- Department of Surgery, Dentistry, Paediatrics and Gynaecology, University of Verona, 37129 Verona, Italy; (F.P.); (A.S.)
| | - Maciej M. Lalowski
- HiLIFE, Meilahti Clinical Proteomics Core Facility, Faculty of Medicine, University of Helsinki, FI-00014 Helsinki, Finland; (R.S.); (M.M.L.)
- Institute of Bioorganic Chemistry, PAS, Department of Biomedical Proteomics, 61-704 Poznań, Poland
| | - Federica Gemignani
- Department of Biology, University of Pisa, 56126 Pisa, Italy; (F.M.); (F.G.)
| | - Filippo M. Santorelli
- Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit—IRCCS Stella Maris, 56128 Pisa, Italy; (S.D.); (D.G.)
- Correspondence: ; Tel.: +39-050-886311
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14
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Çakar A, İnci M, Özdağ Acarlı AN, Çomu S, Candayan A, Battaloğlu E, Tekgül Ş, Başak AN, Durmuş H, Parman Y. Phenotypical spectrum of SACS variants: Neuromuscular perspective of a complex neurodegenerative disorder. Acta Neurol Scand 2022; 145:619-626. [PMID: 35130357 DOI: 10.1111/ane.13592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 01/05/2022] [Accepted: 01/24/2022] [Indexed: 12/28/2022]
Abstract
OBJECTIVES Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is caused by the SACS gene variants. Main clinical features include early-onset and progressive cerebellar ataxia, spasticity, sensorimotor polyneuropathy. However, the phenotypic spectrum expanded with the increased availability of next-generation sequencing methods. MATERIALS AND METHODS Herein, we describe the clinical features of nine patients from seven unrelated families with SACS variants from the cohort of the Neuromuscular Disorders Unit of the Neurology Department of the Istanbul University, Istanbul Faculty of Medicine. RESULTS Seven patients were male. Seven patients in our cohort had disease onset in the first decade of life. Eight patients were born to consanguineous marriages. Distal weakness in the lower limbs was a prominent feature in all of our patients. Seven patients had ataxia, and six patients had spasticity. Interestingly, one patient showed an isolated Charcot-Marie-Tooth-like phenotype. Five patients showed sensorimotor demyelinating polyneuropathy in the nerve conduction studies. Linear pontine hypointensity was the most frequent cranial magnetic resonance imaging (MRI) abnormality. Two patients with a later disease onset had a homozygous c.11542_11544delATT (p.Ile3848del) variant. The rest of the identified variants were scattered throughout the SACS gene. CONCLUSIONS Atypical clinical features in our patients highlight that the phenotypic spectrum of ARSACS can be observed in a wide range.
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Affiliation(s)
- Arman Çakar
- Neuromuscular Unit Department of Neurology Istanbul Faculty of Medicine Istanbul University Istanbul Turkey
| | - Meltem İnci
- Neuromuscular Unit Department of Neurology Istanbul Faculty of Medicine Istanbul University Istanbul Turkey
| | - Ayşe Nur Özdağ Acarlı
- Neuromuscular Unit Department of Neurology Istanbul Faculty of Medicine Istanbul University Istanbul Turkey
| | - Sinan Çomu
- Department of Pediatrics Division of Pediatric Neurology Sisli, Memorial Hospital Istanbul Turkey
| | - Ayşe Candayan
- Department of Molecular Biology and Genetics Bogazici University Istanbul Turkey
| | - Esra Battaloğlu
- Department of Molecular Biology and Genetics Bogazici University Istanbul Turkey
| | - Şeyma Tekgül
- Suna and Inan Kıraç Foundation Neurodegeneration Research Laboratory KUTTAM Koc University School of Medicine Istanbul Turkey
| | - Ayşe Nazlı Başak
- Suna and Inan Kıraç Foundation Neurodegeneration Research Laboratory KUTTAM Koc University School of Medicine Istanbul Turkey
| | - Hacer Durmuş
- Neuromuscular Unit Department of Neurology Istanbul Faculty of Medicine Istanbul University Istanbul Turkey
| | - Yeşim Parman
- Neuromuscular Unit Department of Neurology Istanbul Faculty of Medicine Istanbul University Istanbul Turkey
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15
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Murtinheira F, Migueis M, Letra-Vilela R, Diallo M, Quezada A, Valente CA, Oliva A, Rodriguez C, Martin V, Herrera F. Sacsin Deletion Induces Aggregation of Glial Intermediate Filaments. Cells 2022; 11:299. [PMID: 35053415 PMCID: PMC8773934 DOI: 10.3390/cells11020299] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 01/07/2022] [Accepted: 01/13/2022] [Indexed: 12/14/2022] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a neurodegenerative disorder commonly diagnosed in infants and characterized by progressive cerebellar ataxia, spasticity, motor sensory neuropathy and axonal demyelination. ARSACS is caused by mutations in the SACS gene that lead to truncated or defective forms of the 520 kDa multidomain protein, sacsin. Sacsin function is exclusively studied on neuronal cells, where it regulates mitochondrial network organization and facilitates the normal polymerization of neuronal intermediate filaments (i.e., neurofilaments and vimentin). Here, we show that sacsin is also highly expressed in astrocytes, C6 rat glioma cells and N9 mouse microglia. Sacsin knockout in C6 cells (C6Sacs-/-) induced the accumulation of the glial intermediate filaments glial fibrillary acidic protein (GFAP), nestin and vimentin in the juxtanuclear area, and a concomitant depletion of mitochondria. C6Sacs-/- cells showed impaired responses to oxidative challenges (Rotenone) and inflammatory stimuli (Interleukin-6). GFAP aggregation is also associated with other neurodegenerative conditions diagnosed in infants, such as Alexander disease or Giant Axonal Neuropathy. Our results, and the similarities between these disorders, reinforce the possible connection between ARSACS and intermediate filament-associated diseases and point to a potential role of glia in ARSACS pathology.
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Affiliation(s)
- Fernanda Murtinheira
- Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1649-004 Lisbon, Portugal; (F.M.); (M.M.); (R.L.-V.); (M.D.); (A.Q.)
- Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
| | - Mafalda Migueis
- Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1649-004 Lisbon, Portugal; (F.M.); (M.M.); (R.L.-V.); (M.D.); (A.Q.)
- Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
| | - Ricardo Letra-Vilela
- Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1649-004 Lisbon, Portugal; (F.M.); (M.M.); (R.L.-V.); (M.D.); (A.Q.)
- Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
| | - Mickael Diallo
- Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1649-004 Lisbon, Portugal; (F.M.); (M.M.); (R.L.-V.); (M.D.); (A.Q.)
- Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
- Instituto de Tecnologia Quimica e Biologica (ITQB-NOVA), Universidade Nova de Lisboa, 2780-157 Oeiras, Portugal;
| | - Andrea Quezada
- Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1649-004 Lisbon, Portugal; (F.M.); (M.M.); (R.L.-V.); (M.D.); (A.Q.)
- Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
| | - Cláudia A. Valente
- Instituto de Farmacologia e Neurociências, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal;
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - Abel Oliva
- Instituto de Tecnologia Quimica e Biologica (ITQB-NOVA), Universidade Nova de Lisboa, 2780-157 Oeiras, Portugal;
| | - Carmen Rodriguez
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Facultad de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain; (C.R.); (V.M.)
- Departamento de Morfología y Biología Celular, Facultad de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Vanesa Martin
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Facultad de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain; (C.R.); (V.M.)
- Departamento de Morfología y Biología Celular, Facultad de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Federico Herrera
- Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1649-004 Lisbon, Portugal; (F.M.); (M.M.); (R.L.-V.); (M.D.); (A.Q.)
- Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
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16
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Bagaria J, Bagyinszky E, An SSA. Genetics of Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay (ARSACS) and Role of Sacsin in Neurodegeneration. Int J Mol Sci 2022; 23:552. [PMID: 35008978 PMCID: PMC8745260 DOI: 10.3390/ijms23010552] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 12/30/2021] [Accepted: 12/30/2021] [Indexed: 12/14/2022] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is an early-onset neurodegenerative disease that was originally discovered in the population from the Charlevoix-Saguenay-Lac-Saint-Jean (CSLSJ) region in Quebec. Although the disease progression of ARSACS may start in early childhood, cases with later onset have also been observed. Spasticity and ataxia could be common phenotypes, and retinal optic nerve hypermyelination is detected in the majority of patients. Other symptoms, such as pes cavus, ataxia and limb deformities, are also frequently observed in affected individuals. More than 200 mutations have been discovered in the SACS gene around the world. Besides French Canadians, SACS genetics have been extensively studied in Tunisia or Japan. Recently, emerging studies discovered SACS mutations in several other countries. SACS mutations could be associated with pathogenicity either in the homozygous or compound heterozygous stages. Sacsin has been confirmed to be involved in chaperon activities, controlling the microtubule balance or cell migration. Additionally, sacsin may also play a crucial role in regulating the mitochondrial functions. Through these mechanisms, it may share common mechanisms with other neurodegenerative diseases. Further studies are needed to define the exact functions of sacsin. This review introduces the genetic mutations discovered in the SACS gene and discusses its pathomechanisms and its possible involvement in other neurodegenerative diseases.
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Affiliation(s)
- Jaya Bagaria
- Department of Bionano Technology, Gachon University, Seongnam 13120, Korea;
| | - Eva Bagyinszky
- Department of Industrial and Environmental Engineering, Graduate School of Environment, Gachon University, Seongnam 13120, Korea
| | - Seong Soo A. An
- Department of Bionano Technology, Gachon University, Seongnam 13120, Korea;
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17
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Toscano Márquez B, Cook AA, Rice M, Smileski A, Vieira-Lomasney K, Charron F, McKinney RA, Watt AJ. Molecular Identity and Location Influence Purkinje Cell Vulnerability in Autosomal-Recessive Spastic Ataxia of Charlevoix-Saguenay Mice. Front Cell Neurosci 2022; 15:707857. [PMID: 34970120 PMCID: PMC8712330 DOI: 10.3389/fncel.2021.707857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 11/03/2021] [Indexed: 11/13/2022] Open
Abstract
Patterned cell death is a common feature of many neurodegenerative diseases. In patients with autosomal-recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) and mouse models of ARSACS, it has been observed that Purkinje cells in anterior cerebellar vermis are vulnerable to degeneration while those in posterior vermis are resilient. Purkinje cells are known to express certain molecules in a highly stereotyped, patterned manner across the cerebellum. One patterned molecule is zebrin, which is expressed in distinctive stripes across the cerebellar cortex. The different zones delineated by the expression pattern of zebrin and other patterned molecules have been implicated in the patterning of Purkinje cell death, raising the question of whether they contribute to cell death in ARSACS. We found that zebrin patterning appears normal prior to disease onset in Sacs–/– mice, suggesting that zebrin-positive and -negative Purkinje cell zones develop normally. We next observed that zebrin-negative Purkinje cells in anterior lobule III were preferentially susceptible to cell death, while anterior zebrin-positive cells and posterior zebrin-negative and -positive cells remained resilient even at late disease stages. The patterning of Purkinje cell innervation to the target neurons in the cerebellar nuclei (CN) showed a similar pattern of loss: neurons in the anterior CN, where inputs are predominantly zebrin-negative, displayed a loss of Purkinje cell innervation. In contrast, neurons in the posterior CN, which is innervated by both zebrin-negative and -positive puncta, had normal innervation. These results suggest that the location and the molecular identity of Purkinje cells determine their susceptibility to cell death in ARSACS.
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Affiliation(s)
| | - Anna A Cook
- Department of Biology, McGill University, Montreal, QC, Canada
| | - Max Rice
- Department of Biology, McGill University, Montreal, QC, Canada
| | - Alexia Smileski
- Department of Biology, McGill University, Montreal, QC, Canada
| | | | - François Charron
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - R Anne McKinney
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Alanna J Watt
- Department of Biology, McGill University, Montreal, QC, Canada
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18
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Hsp90 Inhibition: A Promising Therapeutic Approach for ARSACS. Int J Mol Sci 2021; 22:ijms222111722. [PMID: 34769152 PMCID: PMC8584178 DOI: 10.3390/ijms222111722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 10/11/2021] [Accepted: 10/19/2021] [Indexed: 12/30/2022] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a neurodegenerative disease caused by mutations in the SACS gene, encoding the 520 kDa modular protein sacsin, which comprises multiple functional sequence domains that suggest a role either as a scaffold in protein folding or in proteostasis. Cells from patients with ARSACS display a distinct phenotype including altered organisation of the intermediate filament cytoskeleton and a hyperfused mitochondrial network where mitochondrial respiration is compromised. Here, we used vimentin bundling as a biomarker of sacsin function to test the therapeutic potential of Hsp90 inhibition with the C-terminal-domain-targeted compound KU-32, which has demonstrated mitochondrial activity. This study shows that ARSACS patient cells have significantly increased vimentin bundling compared to control, and this was also present in ARSACS carriers despite them being asymptomatic. We found that KU-32 treatment significantly reduced vimentin bundling in carrier and patient cells. We also found that cells from patients with ARSACS were unable to maintain mitochondrial membrane potential upon challenge with mitotoxins, and that the electron transport chain function was restored upon KU-32 treatment. Our preliminary findings presented here suggest that targeting the heat-shock response by Hsp90 inhibition alleviates vimentin bundling and may represent a promising area for the development of therapeutics for ARSACS.
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19
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Huusko JM, Tiensuu H, Haapalainen AM, Pasanen A, Tissarinen P, Karjalainen MK, Zhang G, Christensen K, Ryckman KK, Jacobsson B, Murray JC, Kingsmore SF, Hallman M, Muglia LJ, Rämet M. Integrative genetic, genomic and transcriptomic analysis of heat shock protein and nuclear hormone receptor gene associations with spontaneous preterm birth. Sci Rep 2021; 11:17115. [PMID: 34429451 PMCID: PMC8384995 DOI: 10.1038/s41598-021-96374-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 08/09/2021] [Indexed: 12/13/2022] Open
Abstract
Heat shock proteins are involved in the response to stress including activation of the immune response. Elevated circulating heat shock proteins are associated with spontaneous preterm birth (SPTB). Intracellular heat shock proteins act as multifunctional molecular chaperones that regulate activity of nuclear hormone receptors. Since SPTB has a significant genetic predisposition, our objective was to identify genetic and transcriptomic evidence of heat shock proteins and nuclear hormone receptors that may affect risk for SPTB. We investigated all 97 genes encoding members of the heat shock protein families and all 49 genes encoding nuclear hormone receptors for their potential role in SPTB susceptibility. We used multiple genetic and genomic datasets including genome-wide association studies (GWASs), whole-exome sequencing (WES), and placental transcriptomics to identify SPTB predisposing factors from the mother, infant, and placenta. There were multiple associations of heat shock protein and nuclear hormone receptor genes with SPTB. Several orthogonal datasets supported roles for SEC63, HSPA1L, SACS, RORA, and AR in susceptibility to SPTB. We propose that suppression of specific heat shock proteins promotes maintenance of pregnancy, whereas activation of specific heat shock protein mediated signaling may disturb maternal–fetal tolerance and promote labor.
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Affiliation(s)
- Johanna M Huusko
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland.,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland.,Division of Human Genetics, Center for Prevention of Preterm Birth, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, March of Dimes Prematurity Research Center Ohio Collaborative, Cincinnati, OH, USA
| | - Heli Tiensuu
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland.,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
| | - Antti M Haapalainen
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland.,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
| | - Anu Pasanen
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland.,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
| | - Pinja Tissarinen
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland.,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
| | - Minna K Karjalainen
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland.,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
| | - Ge Zhang
- Division of Human Genetics, Center for Prevention of Preterm Birth, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, March of Dimes Prematurity Research Center Ohio Collaborative, Cincinnati, OH, USA
| | - Kaare Christensen
- Institute of Public Health, University of Southern Denmark, Odense, Denmark
| | - Kelli K Ryckman
- Department of Epidemiology, College of Public Health and Department of Pediatrics, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Bo Jacobsson
- Department of Obstetrics and Gynecology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Department of Genetics and Bioinformatics, Area of Health Data and Digitalisation, Norwegian Institute of Public Health, Oslo, Norway
| | - Jeffrey C Murray
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA
| | - Stephen F Kingsmore
- Rady Children's Institute for Genomic Medicine, Rady Children's Hospital, San Diego, CA, USA
| | - Mikko Hallman
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland.,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
| | - Louis J Muglia
- Division of Human Genetics, Center for Prevention of Preterm Birth, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, March of Dimes Prematurity Research Center Ohio Collaborative, Cincinnati, OH, USA.,Burroughs Wellcome Fund, Research Triangle Park, NC, USA
| | - Mika Rämet
- PEDEGO Research Unit and Medical Research Center Oulu, University of Oulu, Oulu, Finland. .,Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland. .,Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.
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20
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Bomont P. The dazzling rise of neurofilaments: Physiological functions and roles as biomarkers. Curr Opin Cell Biol 2021; 68:181-191. [PMID: 33454158 DOI: 10.1016/j.ceb.2020.10.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 10/13/2020] [Accepted: 10/19/2020] [Indexed: 12/15/2022]
Abstract
In the last two years, neurofilaments (NFs) have become one of the most blazing topics in clinical neuroscience. NFs are major cytoskeletal constituents of neurons, can be detected in body fluids, and have recently emerged as universal biomarkers of neuronal injury and neurological diseases. This review will examine the evolving landscape of NFs, from their specific cellular functions within neurons to their broad clinical value as biomarkers. Particular attention will be given to the dynamic nature of the NF network and its novel roles in microtubule regulation, neurotransmission, and nanomedicine. Building from the initial evidence of causative mutations in NF genes in Charcot-Marie-Tooth diseases, the latest advances at the frontiers of basic and clinical sciences have expanded the scope and relevance of NFs for human health remarkably and have poised to fuel innovation in cell biology and neuroscience.
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Affiliation(s)
- Pascale Bomont
- ERC team, INMG, INSERM U1217, CNRS UMR5310, University of Lyon 1, University of Lyon, Lyon, France.
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21
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Gafson AR, Barthélemy NR, Bomont P, Carare RO, Durham HD, Julien JP, Kuhle J, Leppert D, Nixon RA, Weller RO, Zetterberg H, Matthews PM. Neurofilaments: neurobiological foundations for biomarker applications. Brain 2020; 143:1975-1998. [PMID: 32408345 DOI: 10.1093/brain/awaa098] [Citation(s) in RCA: 155] [Impact Index Per Article: 38.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 12/20/2019] [Accepted: 01/20/2020] [Indexed: 12/11/2022] Open
Abstract
Interest in neurofilaments has risen sharply in recent years with recognition of their potential as biomarkers of brain injury or neurodegeneration in CSF and blood. This is in the context of a growing appreciation for the complexity of the neurobiology of neurofilaments, new recognition of specialized roles for neurofilaments in synapses and a developing understanding of mechanisms responsible for their turnover. Here we will review the neurobiology of neurofilament proteins, describing current understanding of their structure and function, including recently discovered evidence for their roles in synapses. We will explore emerging understanding of the mechanisms of neurofilament degradation and clearance and review new methods for future elucidation of the kinetics of their turnover in humans. Primary roles of neurofilaments in the pathogenesis of human diseases will be described. With this background, we then will review critically evidence supporting use of neurofilament concentration measures as biomarkers of neuronal injury or degeneration. Finally, we will reflect on major challenges for studies of the neurobiology of intermediate filaments with specific attention to identifying what needs to be learned for more precise use and confident interpretation of neurofilament measures as biomarkers of neurodegeneration.
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Affiliation(s)
- Arie R Gafson
- Department of Brain Sciences, Imperial College, London, UK
| | - Nicolas R Barthélemy
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
| | - Pascale Bomont
- ATIP-Avenir team, INM, INSERM, Montpellier University, Montpellier, France
| | - Roxana O Carare
- Clinical Neurosciences, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK
| | - Heather D Durham
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Québec, Canada
| | - Jean-Pierre Julien
- Department of Psychiatry and Neuroscience, Laval University, Quebec, Canada.,CERVO Brain Research Center, 2601 Chemin de la Canardière, Québec, QC, G1J 2G3, Canada
| | - Jens Kuhle
- Neurologic Clinic and Policlinic, Departments of Medicine, Biomedicine and Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - David Leppert
- Neurologic Clinic and Policlinic, Departments of Medicine, Biomedicine and Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Ralph A Nixon
- Center for Dementia Research, Nathan Kline Institute, Orangeburg, NY, 10962, USA.,Departments of Psychiatry, New York University School of Medicine, New York, NY, 10016, USA.,Neuroscience Institute, New York University School of Medicine, New York, NY, 10016, USA.,Department of Cell Biology, New York University School of Medicine, New York, NY, 10016, USA
| | - Roy O Weller
- Clinical Neurosciences, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK
| | - Henrik Zetterberg
- University College London Queen Square Institute of Neurology, London, UK.,UK Dementia Research Institute at University College London, London, UK.,Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.,Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Paul M Matthews
- Department of Brain Sciences, Imperial College, London, UK.,UK Dementia Research Institute at Imperial College, London
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22
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Habibzadeh P, Tabatabaei Z, Inaloo S, Nashatizadeh MM, Synofzik M, Ostovan VR, Faghihi MA. Case Report: Expanding the Genetic and Phenotypic Spectrum of Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay. Front Genet 2020; 11:585136. [PMID: 33414805 PMCID: PMC7784631 DOI: 10.3389/fgene.2020.585136] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 11/13/2020] [Indexed: 02/01/2023] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix–Saguenay (ARSACS) is a rare neurodegenerative disorder caused by biallelic mutations in the SACS gene. Once thought to be limited to Charlevoix–Saguenay region of Quebec, recent evidence has indicated that this disorder is present worldwide. It is classically characterized by the triad of ataxia, pyramidal involvement, and axonal-demyelinating sensorimotor neuropathy. However, diverse clinical features have been reported to be associated with this disorder. In this report, we present the first Iranian family affected by ARSACS with unique clinical features (mirror movements, hypokinesia/bradykinesia, and rigidity) harboring a novel deletion mutation in the SACS gene. Our findings expand the genetic and phenotypic spectrum of this disorder.
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Affiliation(s)
- Parham Habibzadeh
- Persian BayanGene Research and Training Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Zahra Tabatabaei
- Persian BayanGene Research and Training Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Soroor Inaloo
- Neonatal Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Muhammad Mahdi Nashatizadeh
- Parkinson's Disease and Movement Disorder Center, Department of Neurology, University of Kansas School of Medicine, Kansas, KS, United States
| | - Matthis Synofzik
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research and Center of Neurology, University of Tübingen, Tübingen, Germany.,German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Vahid Reza Ostovan
- Clinical Neurology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Ali Faghihi
- Persian BayanGene Research and Training Center, Shiraz University of Medical Sciences, Shiraz, Iran.,Center for Therapeutic Innovation, Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FL, United States
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23
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Bourcier D, Bélanger M, Côté I, Brais B, Synofzik M, Brisson JD, Rodrigue X, Gagnon MM, Mathieu J, Gagnon C. Documenting the psychometric properties of the scale for the assessment and rating of ataxia to advance trial readiness of Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay. J Neurol Sci 2020; 417:117050. [DOI: 10.1016/j.jns.2020.117050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/13/2020] [Accepted: 07/16/2020] [Indexed: 12/28/2022]
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24
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Lottes EN, Cox DN. Homeostatic Roles of the Proteostasis Network in Dendrites. Front Cell Neurosci 2020; 14:264. [PMID: 33013325 PMCID: PMC7461941 DOI: 10.3389/fncel.2020.00264] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 07/28/2020] [Indexed: 12/13/2022] Open
Abstract
Cellular protein homeostasis, or proteostasis, is indispensable to the survival and function of all cells. Distinct from other cell types, neurons are long-lived, exhibiting architecturally complex and diverse multipolar projection morphologies that can span great distances. These properties present unique demands on proteostatic machinery to dynamically regulate the neuronal proteome in both space and time. Proteostasis is regulated by a distributed network of cellular processes, the proteostasis network (PN), which ensures precise control of protein synthesis, native conformational folding and maintenance, and protein turnover and degradation, collectively safeguarding proteome integrity both under homeostatic conditions and in the contexts of cellular stress, aging, and disease. Dendrites are equipped with distributed cellular machinery for protein synthesis and turnover, including dendritically trafficked ribosomes, chaperones, and autophagosomes. The PN can be subdivided into an adaptive network of three major functional pathways that synergistically govern protein quality control through the action of (1) protein synthesis machinery; (2) maintenance mechanisms including molecular chaperones involved in protein folding; and (3) degradative pathways (e.g., Ubiquitin-Proteasome System (UPS), endolysosomal pathway, and autophagy. Perturbations in any of the three arms of proteostasis can have dramatic effects on neurons, especially on their dendrites, which require tightly controlled homeostasis for proper development and maintenance. Moreover, the critical importance of the PN as a cell surveillance system against protein dyshomeostasis has been highlighted by extensive work demonstrating that the aggregation and/or failure to clear aggregated proteins figures centrally in many neurological disorders. While these studies demonstrate the relevance of derangements in proteostasis to human neurological disease, here we mainly review recent literature on homeostatic developmental roles the PN machinery plays in the establishment, maintenance, and plasticity of stable and dynamic dendritic arbors. Beyond basic housekeeping functions, we consider roles of PN machinery in protein quality control mechanisms linked to dendritic plasticity (e.g., dendritic spine remodeling during LTP); cell-type specificity; dendritic morphogenesis; and dendritic pruning.
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Affiliation(s)
- Erin N Lottes
- Neuroscience Institute, Georgia State University, Atlanta, GA, United States
| | - Daniel N Cox
- Neuroscience Institute, Georgia State University, Atlanta, GA, United States
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25
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de Freitas JL, Rezende Filho FM, Sallum JM, França MC, Pedroso JL, Barsottini OG. Ophthalmological changes in hereditary spastic paraplegia and other genetic diseases with spastic paraplegia. J Neurol Sci 2020; 409:116620. [DOI: 10.1016/j.jns.2019.116620] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 11/16/2019] [Accepted: 12/05/2019] [Indexed: 01/05/2023]
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26
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Moutaoufik MT, Malty R, Amin S, Zhang Q, Phanse S, Gagarinova A, Zilocchi M, Hoell L, Minic Z, Gagarinova M, Aoki H, Stockwell J, Jessulat M, Goebels F, Broderick K, Scott NE, Vlasblom J, Musso G, Prasad B, Lamantea E, Garavaglia B, Rajput A, Murayama K, Okazaki Y, Foster LJ, Bader GD, Cayabyab FS, Babu M. Rewiring of the Human Mitochondrial Interactome during Neuronal Reprogramming Reveals Regulators of the Respirasome and Neurogenesis. iScience 2019; 19:1114-1132. [PMID: 31536960 PMCID: PMC6831851 DOI: 10.1016/j.isci.2019.08.057] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 06/28/2019] [Accepted: 08/29/2019] [Indexed: 12/13/2022] Open
Abstract
Mitochondrial protein (MP) assemblies undergo alterations during neurogenesis, a complex process vital in brain homeostasis and disease. Yet which MP assemblies remodel during differentiation remains unclear. Here, using mass spectrometry-based co-fractionation profiles and phosphoproteomics, we generated mitochondrial interaction maps of human pluripotent embryonal carcinoma stem cells and differentiated neuronal-like cells, which presented as two discrete cell populations by single-cell RNA sequencing. The resulting networks, encompassing 6,442 high-quality associations among 600 MPs, revealed widespread changes in mitochondrial interactions and site-specific phosphorylation during neuronal differentiation. By leveraging the networks, we show the orphan C20orf24 as a respirasome assembly factor whose disruption markedly reduces respiratory chain activity in patients deficient in complex IV. We also find that a heme-containing neurotrophic factor, neuron-derived neurotrophic factor [NENF], couples with Parkinson disease-related proteins to promote neurotrophic activity. Our results provide insights into the dynamic reorganization of mitochondrial networks during neuronal differentiation and highlights mechanisms for MPs in respirasome, neuronal function, and mitochondrial diseases. Rewiring of mitochondrial (mt) protein interaction network in distinct cell states Dramatic changes in site-specific phosphorylation during neuronal differentiation C20orf24 is a respirasome assembly factor depleted in patients deficient in CIV NENF binding with DJ-1/PINK1 promotes neurotrophic activity and neuronal survival
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Affiliation(s)
| | - Ramy Malty
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Shahreen Amin
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Qingzhou Zhang
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Sadhna Phanse
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Alla Gagarinova
- Department of Biochemistry, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Mara Zilocchi
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Larissa Hoell
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Zoran Minic
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Maria Gagarinova
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Hiroyuki Aoki
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Jocelyn Stockwell
- Department of Surgery, Neuroscience Research Group, College of Medicine, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Matthew Jessulat
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Florian Goebels
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Kirsten Broderick
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Nichollas E Scott
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - James Vlasblom
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada
| | - Gabriel Musso
- Department of Medicine, Harvard Medical School and Cardiovascular Division, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - Bhanu Prasad
- Department of Medicine, Regina Qu'Appelle Health Region, Regina, SK S4P 0W5, Canada
| | - Eleonora Lamantea
- Medical Genetics and Neurogenetics Unit, Fondazione IRCCS Instituto Neurologico Carlo Besta, via L. Temolo, 4, 20126 Milan, Italy
| | - Barbara Garavaglia
- Medical Genetics and Neurogenetics Unit, Fondazione IRCCS Instituto Neurologico Carlo Besta, via L. Temolo, 4, 20126 Milan, Italy
| | - Alex Rajput
- Department of Medicine, Division of Neurology, College of Medicine, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Kei Murayama
- Department of Metabolism, Chiba Children's Hospital, 579-1 Heta-cho, Midori, Chiba 266-0007, Japan
| | - Yasushi Okazaki
- Graduate School of Medicine, Intractable Disease Research Center, Juntendo University, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Leonard J Foster
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Gary D Bader
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Francisco S Cayabyab
- Department of Surgery, Neuroscience Research Group, College of Medicine, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Mohan Babu
- Department of Biochemistry, University of Regina, Regina, SK S4S 0A2, Canada.
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27
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Lee S, Eyer J, Letournel F, Boumil E, Hall G, Shea TB. Neurofilaments form flexible bundles during neuritogenesis in culture and in mature axons in situ. J Neurosci Res 2019; 97:1306-1318. [PMID: 31304612 DOI: 10.1002/jnr.24482] [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: 02/16/2019] [Revised: 05/28/2019] [Accepted: 05/29/2019] [Indexed: 11/07/2022]
Abstract
Neurofilaments (NFs) undergo cation-dependent phospho-mediated associations with each other and other cytoskeletal elements that support axonal outgrowth. Progressive NF-NF associations generate a resident, bundled population that undergoes exchange with transporting NFs. We examined the properties of bundled NFs. Bundles did not always display a fully linear profile but curved and twisted at various points along the neurite length. Bundles retracted faster than neurites and retracted bundles did not expand following extraction with Triton, indicating that they coiled passively rather than due to pressure from the cell. Bundles consisted of helically wound NFs, which may provide flexibility necessary for turning of growing axons during pathfinding. Interactions between NFs and other cytoskeletal elements may be disrupted en masse during neurite retraction or regionally during remodeling. It is suggested that bundles within long axons that cannot be fully retracted into the soma could provide maintain proximal support yet still allow more distal flexibility for remodeling and changing direction during pathfinding.
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Affiliation(s)
- Sangmook Lee
- Laboratory for Neuroscience, Department of Biology Science, UMass Lowell, Lowell, Massachusetts
| | - Joel Eyer
- Institut de Biologie en Santé PBH-IRIS, Universitaire d'Angers, Angers, France
| | | | - Edward Boumil
- Center for Vision Research, SUNY Upstate, Syracuse, New York
| | - Garth Hall
- Laboratory for Neuroscience, Department of Biology Science, UMass Lowell, Lowell, Massachusetts
| | - Thomas B Shea
- Laboratory for Neuroscience, Department of Biology Science, UMass Lowell, Lowell, Massachusetts
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28
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Larivière R, Sgarioto N, Márquez BT, Gaudet R, Choquet K, McKinney RA, Watt AJ, Brais B. Sacs R272C missense homozygous mice develop an ataxia phenotype. Mol Brain 2019; 12:19. [PMID: 30866998 PMCID: PMC6416858 DOI: 10.1186/s13041-019-0438-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 02/25/2019] [Indexed: 12/29/2022] Open
Abstract
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS [MIM 270550]) is an early-onset neurodegenerative disorder caused by mutations in the SACS gene. Over 200 SACS mutations have been identified. Most mutations lead to a complete loss of a sacsin, a large 520 kD protein, although some missense mutations are associated with low levels of sacsin expression. We previously showed that Sacs knock-out mice demonstrate early-onset ataxic phenotype with neurofilament bundling in many neuronal populations. To determine if the preservation of some mutated sacsin protein resulted in the same cellular and behavioral alterations, we generated mice expressing an R272C missense mutation, a homozygote mutation found in some affected patients. Though SacsR272C mice express 21% of wild type brain sacsin and sacsin is found in many neurons, they display similar abnormalities to Sacs knock-out mice, including the development of an ataxic phenotype, reduced Purkinje cell firing rates, and somatodendritic neurofilament bundles in Purkinje cells and other neurons. Together our results support that Sacs missense mutation largely lead to loss of sacsin function.
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Affiliation(s)
- Roxanne Larivière
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Room 622, 3801, University Street, Montreal, Québec, H3A 2B4, Canada
| | - Nicolas Sgarioto
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Room 622, 3801, University Street, Montreal, Québec, H3A 2B4, Canada
| | | | - Rébecca Gaudet
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Room 622, 3801, University Street, Montreal, Québec, H3A 2B4, Canada
| | - Karine Choquet
- Department of Human Genetics, Montreal Neurological Institute, McGill University, Montreal, Qc, Canada
| | - R Anne McKinney
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Qc, Canada
| | - Alanna J Watt
- Department of Biology, McGill University, Montreal, Qc, Canada
| | - Bernard Brais
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Room 622, 3801, University Street, Montreal, Québec, H3A 2B4, Canada.
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