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Ait El Cadi C, Dafrallah L, Amalou G, Charif M, Charoute H, Araqi-Houssaini A, Lakhiari H, Lenaers G, Barakat A. A case report of two Moroccan patients with hereditary neurological disorders and molecular modeling study on the S72L de novo PMP22 variant. Rev Neurol (Paris) 2023; 179:902-909. [PMID: 37296061 DOI: 10.1016/j.neurol.2023.01.728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 12/21/2022] [Accepted: 01/11/2023] [Indexed: 06/12/2023]
Abstract
Hereditary neurological disorders represent a wild group of hereditary illnesses affecting mainly the nervous system, the majority of which have a Mendelian inheritance pattern. Here we present the case of two Moroccan patients each affected by a different hereditary neurological disorder. In the first patient WES analysis revealed the presence of the p.Ser72Leu de novo mutation in the PMP22 gene reported for the first time in Africa, specifically in Morocco. This variant is predicted to be in a mutation "hot-spot" region causing Dejerine-Sottas syndrome called also Charcot-Marie-Tooth type 3. The molecular modeling study suggests an important alteration of hydrogen and hydrophobic interactions between the residue in position 72 of the PMP22 protein and its surrounding amino acids. On the other hand, the p.Ala177Thr mutation on the RNASEH2B gene, responsible of Aicardi-Goutières syndrome 2, was carried in a homozygous state by the second patient descending from a consanguineous family. This mutation is common among the Moroccan population as well as in other North African countries. The present results contributed to a better follow-up of both cases allowing better symptom management with convenient treatments.
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Affiliation(s)
- C Ait El Cadi
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; Laboratoire de virologie, microbiologie, qualité et biotechnologies/eco-toxicologie et biodiversité, faculté des sciences et techniques de Mohammedia, BP 146, 28806 Mohammedia, Morocco
| | - L Dafrallah
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; Laboratoire de virologie, microbiologie, qualité et biotechnologies/eco-toxicologie et biodiversité, faculté des sciences et techniques de Mohammedia, BP 146, 28806 Mohammedia, Morocco
| | - G Amalou
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - M Charif
- MitoLab team, institut MitoVasc, UMR CNRS 6015, Inserm U1083, université d'Angers, Angers, France; Laboratory of Physiology, Genetics and Ethnopharmacology, Faculty of Sciences, University Mohammed Premier, Oujda, Morocco
| | - H Charoute
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - A Araqi-Houssaini
- Cabinet neurologie Dr. Adil Araqi-Houssaini, résidence Infitah, 3, rue Nahass Nahoui Maarif, Casablanca, Morocco
| | - H Lakhiari
- Laboratoire de virologie, microbiologie, qualité et biotechnologies/eco-toxicologie et biodiversité, faculté des sciences et techniques de Mohammedia, BP 146, 28806 Mohammedia, Morocco
| | - G Lenaers
- MitoLab team, institut MitoVasc, UMR CNRS 6015, Inserm U1083, université d'Angers, Angers, France
| | - A Barakat
- Human Molecular Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco.
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2
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Moss KR, Bopp TS, Johnson AE, Höke A. New evidence for secondary axonal degeneration in demyelinating neuropathies. Neurosci Lett 2021; 744:135595. [PMID: 33359733 PMCID: PMC7852893 DOI: 10.1016/j.neulet.2020.135595] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 10/31/2020] [Accepted: 12/19/2020] [Indexed: 12/28/2022]
Abstract
Development of peripheral nervous system (PNS) myelin involves a coordinated series of events between growing axons and the Schwann cell (SC) progenitors that will eventually ensheath them. Myelin sheaths have evolved out of necessity to maintain rapid impulse propagation while accounting for body space constraints. However, myelinating SCs perform additional critical functions that are required to preserve axonal integrity including mitigating energy consumption by establishing the nodal architecture, regulating axon caliber by organizing axonal cytoskeleton networks, providing trophic and potentially metabolic support, possibly supplying genetic translation materials and protecting axons from toxic insults. The intermediate steps between the loss of these functions and the initiation of axon degeneration are unknown but the importance of these processes provides insightful clues. Prevalent demyelinating diseases of the PNS include the inherited neuropathies Charcot-Marie-Tooth Disease, Type 1 (CMT1) and Hereditary Neuropathy with Liability to Pressure Palsies (HNPP) and the inflammatory diseases Acute Inflammatory Demyelinating Polyneuropathy (AIDP) and Chronic Inflammatory Demyelinating Polyneuropathy (CIDP). Secondary axon degeneration is a common feature of demyelinating neuropathies and this process is often correlated with clinical deficits and long-lasting disability in patients. There is abundant electrophysiological and histological evidence for secondary axon degeneration in patients and rodent models of PNS demyelinating diseases. Fully understanding the involvement of secondary axon degeneration in these diseases is essential for expanding our knowledge of disease pathogenesis and prognosis, which will be essential for developing novel therapeutic strategies.
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Affiliation(s)
- Kathryn R Moss
- Department of Neurology, Neuromuscular Division, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Taylor S Bopp
- Department of Neurology, Neuromuscular Division, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Anna E Johnson
- Department of Neurology, Neuromuscular Division, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Ahmet Höke
- Department of Neurology, Neuromuscular Division, Johns Hopkins School of Medicine, Baltimore, MD, United States.
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3
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Wu R, Fu J, Meng L, Lv H, Wang Z, Zhirong J, Yuan Y. Homozygous splice‐site mutation c.78 + 5G>A in
PMP22
causes congenital hypomyelinating neuropathy. Neuropathology 2019; 39:441-446. [PMID: 31777123 DOI: 10.1111/neup.12604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/24/2019] [Accepted: 08/25/2019] [Indexed: 01/10/2023]
Affiliation(s)
- Rui Wu
- Department of NeurologyPeking University First Hospital Beijing China
| | - Jun Fu
- Department of NeurologyPeking University First Hospital Beijing China
| | - Lingchao Meng
- Department of NeurologyPeking University First Hospital Beijing China
| | - He Lv
- Department of NeurologyPeking University First Hospital Beijing China
| | - Zhaoxia Wang
- Department of NeurologyPeking University First Hospital Beijing China
| | - Jia Zhirong
- Department of NeurologyPeking University First Hospital Beijing China
| | - Yun Yuan
- Department of NeurologyPeking University First Hospital Beijing China
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Jouaud M, Mathis S, Richard L, Lia AS, Magy L, Vallat JM. Rodent models with expression of PMP22: Relevance to dysmyelinating CMT and HNPP. J Neurol Sci 2019; 398:79-90. [PMID: 30685714 DOI: 10.1016/j.jns.2019.01.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 12/26/2018] [Accepted: 01/16/2019] [Indexed: 02/02/2023]
Abstract
BACKGROUND Charcot-Marie-Tooth diseases (CMT) are due to abnormalities of many genes, the most frequent being linked to PMP22 (Peripheral Myelin Protein 22). In the past, only spontaneous genetic anomalies occurring in mouse mutants such as Trembler (Tr) mice were available; more recently, several rodent models have been generated for exploration of the pathophysiological mechanisms underlying these neuropathies. METHODS Based on the personal experience of our team, we describe here the pathological hallmarks of most of these animal models and compare them to the pathological features observed in some CMT patient nerves (CMT types 1A and E; hereditary neuropathy with liability to pressure palsies, HNPP). RESULTS We describe clinical data and detailed pathological analysis mainly by electron microscopy of the sciatic nerves of these animal models conducted in our laboratory; lesions of PMP22 deficient animals (KO and mutated PMP22) and PMP22 overexpressed models are described and compared to ultrastructural anomalies of nerve biopsies from CMT patients due to PMP22 gene anomalies. It is of note that while there are some similarities, there are also significant differences between the lesions in animal models and human cases. Such observations highlight the complex roles played by PMP22 in nerve development. CONCLUSION It should be borne in mind that we require additional correlations between animal models of hereditary neuropathies and CMT patients to rationalize the development of efficient drugs.
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Affiliation(s)
- Maxime Jouaud
- Equipe d'accueil 6309, Maintenance myélinique et Neuropathies périphériques, University of Limoges, 2 rue du Docteur Raymond Marcland, 87000 Limoges, France
| | - Stéphane Mathis
- Department of Neurology, Nerve-Muscle Unit, CHU Bordeaux (Pellegrin University Hospital), place Amélie Raba-Léon, 33000 Bordeaux, France; National Reference Center 'maladies neuromusculaires du Grand Sud-ouest', CHU Bordeaux (Pellegrin University Hospital), place Amélie Raba-Léon, 33000 Bordeaux, France
| | - Laurence Richard
- Department of Neurology, CHU Limoges, Dupuytren University Hospital, 2 avenue Martin Luther King, 87042 Limoges, France; National Reference Center for 'Rare Peripheral Neuropathies', CHU Limoges, Dupuytren University Hospital, 2 avenue Martin Luther King, 87042 Limoges, France
| | - Anne-Sophie Lia
- Equipe d'accueil 6309, Maintenance myélinique et Neuropathies périphériques, University of Limoges, 2 rue du Docteur Raymond Marcland, 87000 Limoges, France; Department of Biochemistry and Molecular Genetics, CHU Limoges, Dupuytren University Hospital, 2 avenue Martin Luther King, 87042 Limoges, France
| | - Laurent Magy
- Department of Neurology, CHU Limoges, Dupuytren University Hospital, 2 avenue Martin Luther King, 87042 Limoges, France; National Reference Center for 'Rare Peripheral Neuropathies', CHU Limoges, Dupuytren University Hospital, 2 avenue Martin Luther King, 87042 Limoges, France
| | - Jean-Michel Vallat
- Department of Neurology, CHU Limoges, Dupuytren University Hospital, 2 avenue Martin Luther King, 87042 Limoges, France; National Reference Center for 'Rare Peripheral Neuropathies', CHU Limoges, Dupuytren University Hospital, 2 avenue Martin Luther King, 87042 Limoges, France.
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Genotype–phenotype correlation of Charcot-Marie-Tooth type 1E patients with PMP22 mutations. Genes Genomics 2016. [DOI: 10.1007/s13258-016-0423-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Vital A, Sole G, Casenave P, Magdelaine C, Ferrer X, Vital C, Goizet C. Severe Charcot-Marie-Tooth disease type 1E caused by a novel p.Phe84Leufs*24 PMP22
point mutation. J Peripher Nerv Syst 2013; 18:181-4. [DOI: 10.1111/jns5.12028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Revised: 03/28/2013] [Accepted: 05/22/2013] [Indexed: 12/01/2022]
Affiliation(s)
- Anne Vital
- Institut des Maladies Neurodégénératives; CNRS UMR 5293, Université de Bordeaux; Bordeaux France
| | - Guilhem Sole
- Département de Neurologie et Maladies Neuromusculaires; CHU Bordeaux; Bordeaux France
- Laboratoire Maladies Rares: Génétique et Métabolisme (MRGM); Université de Bordeaux; Bordeaux France
| | - Philippe Casenave
- Département de Neurologie et Maladies Neuromusculaires; CHU Bordeaux; Bordeaux France
| | - Corinne Magdelaine
- Service de Biochimie et de Génétique Moléculaire; CHU Limoges; Limoges France
| | - Xavier Ferrer
- Département de Neurologie et Maladies Neuromusculaires; CHU Bordeaux; Bordeaux France
- Laboratoire Maladies Rares: Génétique et Métabolisme (MRGM); Université de Bordeaux; Bordeaux France
| | - Claude Vital
- Institut des Maladies Neurodégénératives; CNRS UMR 5293, Université de Bordeaux; Bordeaux France
| | - Cyril Goizet
- Laboratoire Maladies Rares: Génétique et Métabolisme (MRGM); Université de Bordeaux; Bordeaux France
- Service de Génétique Médicale; CHU Bordeaux; Bordeaux France
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Taniguchi JB, Elui VM, Osorio FL, Hallak JE, Crippa JA, Machado-de-Sousa JP, Kebbe LM, Lourenco CM, Scarel-Caminaga RM, Marques Jr W. Quality of life in patients with Charcot-Marie-Tooth disease type 1A. ARQUIVOS DE NEURO-PSIQUIATRIA 2013; 71:392-6. [DOI: 10.1590/0004-282x20130045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 11/01/2012] [Indexed: 11/22/2022]
Abstract
We assessed the functional impairment in Charcot-Marie-Tooth resulting from 17p11.2-p12 duplication (CMT1A) patients using the Short-Form Health Survey (SF-36), which is a quality of life questionnaire. Twenty-five patients of both genders aged ≥10 years with a positive molecular diagnosis of CMT1A were selected. Age- and gender-matched Control Group (without family history of neuropathy), and the sociodemographic and professional conditions similar to the patients' group were selected to compare the SF-36 results between them. The results showed that the majority quality of life impairments in CMT1A patients occurred in the social and emotional domains. Functional capacity also tended to be significantly affected; other indicators of physical impairment were preserved. In conclusion, social and emotional aspects are mostly neglected in the assistance provided to CMT1A Brazilian patients, and they should be better understood in order to offer global health assistance with adequate quality of life as a result.
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Affiliation(s)
- Juliana B. Taniguchi
- Universidade de Sao Paulo, Brazil; Universidade Estadual Paulista Julio de Mesquita Filho, Brazil
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8
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Calia L, Marques W, Gouvea SP, Lourenço CM, de Oliveira ASB. Proptosis in a family with the p16 Leuc-to-Prol mutation in the PMP22 gene (CMT 1E). ARQUIVOS DE NEURO-PSIQUIATRIA 2013; 71:332-3. [PMID: 23689413 DOI: 10.1590/0004-282x20130031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Accepted: 11/12/2012] [Indexed: 11/21/2022]
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9
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Abstract
The prenatal and infantile neuropathies are an uncommon and complex group of conditions, most of which are genetic. Despite advances in diagnostic techniques, approximately half of children presenting in infancy remain without a specific diagnosis. This review focuses on inherited demyelinating neuropathies presenting in the first year of life. We clarify the nomenclature used in these disorders, review the clinical features of demyelinating forms of Charcot-Marie-Tooth disease with early onset, and discuss the demyelinating infantile neuropathies associated with central nervous system involvement. Useful clinical, neurophysiologic, and neuropathologic features in the diagnostic work-up of these conditions are also presented.
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Affiliation(s)
- Eppie M Yiu
- Children's Neuroscience Centre, Royal Children's Hospital, Flemington Road, Parkville, Victoria, Australia
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10
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Gess B, Schirmacher A, Young P. Reply. Muscle Nerve 2011. [DOI: 10.1002/mus.22122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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11
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Gouvea SP, S Borghetti VH, Bueno KC, Genari AB, Lourenço CM, Sobreira C, Barreira AA, Marques W. Compound Charcot-Marie-Tooth disease may determine unusual and milder phenotypes. Neurogenetics 2009; 11:135-8. [PMID: 19705173 DOI: 10.1007/s10048-009-0211-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Accepted: 07/29/2009] [Indexed: 10/20/2022]
Abstract
Compound forms of Charcot-Marie-Tooth (CMT) disease have been recently associated with unusually severe neuropathies, an observation that prompted the proposition that the additive effects of two mutations should be searched in patients whose clinical severity falls outside the common CMT phenotypes. In this report, we present a father and a daughter with a very mild and unusual disease that segregates with two mutations in PMP22 gene, the 17p11.2-p12 duplication and a Ser72Leu point mutation. We propose that the deleterious effects of each mutation are partially compensated by the functional effect of the other.
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Affiliation(s)
- Silmara P Gouvea
- Department of Neurosciences and Behavioral Sciences, School of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
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12
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Oliver PL, Bitoun E, Davies KE. Comparative genetic analysis: the utility of mouse genetic systems for studying human monogenic disease. Mamm Genome 2007; 18:412-24. [PMID: 17514509 PMCID: PMC1998876 DOI: 10.1007/s00335-007-9014-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2007] [Revised: 03/19/2007] [Accepted: 03/22/2007] [Indexed: 12/23/2022]
Abstract
One of the long-term goals of mutagenesis programs in the mouse has been to generate mutant lines to facilitate the functional study of every mammalian gene. With a combination of complementary genetic approaches and advances in technology, this aim is slowly becoming a reality. One of the most important features of this strategy is the ability to identify and compare a number of mutations in the same gene, an allelic series. With the advent of gene-driven screening of mutant archives, the search for a specific series of interest is now a practical option. This review focuses on the analysis of multiple mutations from chemical mutagenesis projects in a wide variety of genes and the valuable functional information that has been obtained from these studies. Although gene knockouts and transgenics will continue to be an important resource to ascertain gene function, with a significant proportion of human diseases caused by point mutations, identifying an allelic series is becoming an equally efficient route to generating clinically relevant and functionally important mouse models.
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Affiliation(s)
- Peter L. Oliver
- Department of Physiology, Anatomy and Genetics, MRC Functional Genetics Unit, University of Oxford, South Parks Road, Oxford, OX1 3QX UK
| | - Emmanuelle Bitoun
- Department of Physiology, Anatomy and Genetics, MRC Functional Genetics Unit, University of Oxford, South Parks Road, Oxford, OX1 3QX UK
| | - Kay E. Davies
- Department of Physiology, Anatomy and Genetics, MRC Functional Genetics Unit, University of Oxford, South Parks Road, Oxford, OX1 3QX UK
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13
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Marques VD, Barreira AA, Davis MB, Abou-Sleiman PM, Silva WA, Zago MA, Sobreira C, Fazan V, Marques W. Expanding the phenotypes of the Pro56Ser VAPB mutation: proximal SMA with dysautonomia. Muscle Nerve 2007; 34:731-9. [PMID: 16967488 DOI: 10.1002/mus.20657] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The phenotype of 16 members of a family affected by a late-onset, dominant, progressive, motor and autonomic disorder is described. The VAPB (Pro56Ser) mutation was detected in Brazilian families with different phenotypes of motor neuron disorders. In this family, proximal and axial muscle weakness and atrophy, associated with abdominal protrusion, defined the motor phenotype. Death occurred in 10-15 years due to respiratory insufficiency. Tone and tendon reflexes were decreased and a distal tremor was common. Sensation was preserved. Autonomic abnormalities were also present, including choking, chronic intestinal constipation, sexual dysfunction, and sudomotor abnormalities, and on nerve morphology there was involvement of unmyelinated fibers. Electromyography disclosed ongoing denervation and reinnervation. Isolated dysfunction of motor and autonomic neurons is unusual among the spinal muscular atrophies. On this basis, this condition seems to represent a new category of disease.
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Affiliation(s)
- Vanessa D Marques
- Department of Neurology, School of Medicine of Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900 Ribeirão Preto, São Paulo, 14049-900, Brazil
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14
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Meekins GD, Weiss MD. Electrodiagnostic Studies in a Murine Model of Demyelinating Charcot-Marie-Tooth Disease. Phys Med Rehabil Clin N Am 2005; 16:967-79, ix. [PMID: 16214054 DOI: 10.1016/j.pmr.2005.08.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Gregg D Meekins
- Department of Neurology, University of Washington School of Medicine, Box 356115, 1959 NE Pacific Street, Seattle, WA 98195, USA
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15
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Oliver PL, Davies KE. Analysis of human neurological disorders using mutagenesis in the mouse. Clin Sci (Lond) 2005; 108:385-97. [PMID: 15831088 DOI: 10.1042/cs20050041] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The mouse continues to play a vital role in the deciphering of mammalian gene function and the modelling of human neurological disease. Advances in gene targeting technologies have facilitated the efficiency of generating new mouse mutants, although this valuable resource has rapidly expanded in recent years due to a number of major random mutagenesis programmes. The phenotype-driven mutagenesis screen at the MRC Mammalian Genetics Unit has generated a significant number of mice with potential neurological defects, and our aim has been to characterize selected mutants on a pathological and molecular level. Four lines are discussed, one displaying late-onset ataxia caused by Purkinje cell loss and an allelic series of three tremor mutants suffering from hypomyelination of the peripheral nerve. Molecular analysis of the causative mutation in each case has provided new insights into functional aspects of the mutated proteins, illustrating the power of mutagenesis screens to generate both novel and clinically relevant disease models.
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Affiliation(s)
- Peter L Oliver
- MRC Functional Genetics Unit, Department of Human Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
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