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Bertini A, Gentile L, Cavallaro T, Tozza S, Saveri P, Russo M, Massucco S, Falzone YM, Bellone E, Taioli F, Geroldi A, Occhipinti G, Ferrarini M, Cavalca E, Crivellari L, Mandich P, Balistreri F, Magri S, Taroni F, Previtali SC, Schenone A, Grandis M, Manganelli F, Fabrizi GM, Mazzeo A, Pareyson D, Pisciotta C. Phenotypic spectrum of myelin protein zero-related neuropathies: a large cohort study from five mutation clusters across Italy. J Neurol Neurosurg Psychiatry 2024:jnnp-2024-333842. [PMID: 38839277 DOI: 10.1136/jnnp-2024-333842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Accepted: 05/22/2024] [Indexed: 06/07/2024]
Abstract
BACKGROUND We aimed to investigate the clinical features of a large cohort of patients with myelin protein zero (MPZ)-related neuropathy, focusing on the five main mutation clusters across Italy. METHODS We retrospectively gathered a minimal data set of clinical information in a series of patients with these frequent mutations recruited among Italian Charcot-Marie-Tooth (CMT) registry centres, including disease onset/severity (CMTES-CMT Examination Score), motor/sensory symptoms and use of orthotics/aids. RESULTS We collected data from 186 patients: 60 had the p.Ser78Leu variant ('classical' CMT1B; from Eastern Sicily), 42 the p.Pro70Ser (CMT2I; mainly from Lombardy), 38 the p.Thr124Met (CMT2J; from Veneto), 25 the p.Ser44Phe (CMT2I; from Sardinia) and 21 the p.Asp104ThrfsX13 (mild CMT1B; from Apulia) mutation. Disease severity (CMTES) was higher (p<0.001) in late-onset axonal forms (p.Thr124Met=9.2±6.6; p.Ser44Phe=7.8±5.7; p.Pro70Ser=7.6±4.8) compared with p.Ser78Leu (6.1±3.5) patients. Disease progression (ΔCMTES/year) was faster in the p.Pro70Ser cohort (0.8±1.0), followed by p.Ser44Phe (0.7±0.4), p.Thr124Met (0.4±0.5) and p.Ser78Leu (0.2±0.4) patients. Disease severity (CMTES=1.2±1.5), progression (ΔCMTES/year=0.1±0.4) and motor involvement were almost negligible in p.Asp104ThrfsX13 patients, who, however, frequently (78%, p<0.001) complained of neuropathic pain. In the other four clusters, walking difficulties were reported by 69-85% of patients, while orthotic and walking aids use ranged between 40-62% and 16-28%, respectively. CONCLUSIONS This is the largest MPZ (and late-onset CMT2) cohort ever collected, reporting clinical features and disease progression of 186 patients from five different clusters across Italy. Our findings corroborate the importance of differentiating between 'classical' childhood-onset demyelinating, late-onset axonal and mild MPZ-related neuropathy, characterised by different pathomechanisms, in view of different therapeutic targets.
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Affiliation(s)
- Alessandro Bertini
- Unità di Malattie Neurologiche Rare, Dipartimento di Neuroscienze Cliniche, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Luca Gentile
- Unità di Neurologia e Malattie Neuromuscolari, Dipartimento di Medicina Clinica e Sperimentale, Università di Messina, Messina, Italy
| | - Tiziana Cavallaro
- Dipartimento di Neuroscienze, Biomedicina e Movimento, Università di Verona, Verona, Italy
| | - Stefano Tozza
- Dipartimento di Neuroscienze, Scienze Riproduttive ed Odontostomatologiche, Università Federico II di Napoli, Naples, Italy
| | - Paola Saveri
- Unità di Malattie Neurologiche Rare, Dipartimento di Neuroscienze Cliniche, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Massimo Russo
- Unità di Neurologia e Malattie Neuromuscolari, Dipartimento di Medicina Clinica e Sperimentale, Università di Messina, Messina, Italy
| | - Sara Massucco
- Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze materno-infantili, Università di Genova, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Yuri Matteo Falzone
- INSPE and Division of Neuroscience, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Emilia Bellone
- Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze materno-infantili, Università di Genova, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Federica Taioli
- Dipartimento di Neuroscienze, Biomedicina e Movimento, Università di Verona, Verona, Italy
| | - Alessandro Geroldi
- Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze materno-infantili, Università di Genova, Genoa, Italy
| | - Giuseppe Occhipinti
- Unità di Neurologia e Malattie Neuromuscolari, Dipartimento di Medicina Clinica e Sperimentale, Università di Messina, Messina, Italy
| | - Moreno Ferrarini
- Dipartimento di Neuroscienze, Biomedicina e Movimento, Università di Verona, Verona, Italy
| | - Eleonora Cavalca
- Unità di Malattie Neurologiche Rare, Dipartimento di Neuroscienze Cliniche, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Luca Crivellari
- Unità di Malattie Neurologiche Rare, Dipartimento di Neuroscienze Cliniche, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Paola Mandich
- Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze materno-infantili, Università di Genova, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Francesca Balistreri
- Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Stefania Magri
- Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Franco Taroni
- Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | | | - Angelo Schenone
- Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze materno-infantili, Università di Genova, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Marina Grandis
- Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze materno-infantili, Università di Genova, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Fiore Manganelli
- Dipartimento di Neuroscienze, Scienze Riproduttive ed Odontostomatologiche, Università Federico II di Napoli, Naples, Italy
| | - Gian Maria Fabrizi
- Dipartimento di Neuroscienze, Biomedicina e Movimento, Università di Verona, Verona, Italy
| | - Anna Mazzeo
- Unità di Neurologia e Malattie Neuromuscolari, Dipartimento di Medicina Clinica e Sperimentale, Università di Messina, Messina, Italy
| | - Davide Pareyson
- Unità di Malattie Neurologiche Rare, Dipartimento di Neuroscienze Cliniche, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Chiara Pisciotta
- Unità di Malattie Neurologiche Rare, Dipartimento di Neuroscienze Cliniche, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
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Lei L, Xiaobo L, Zhiqiang L, Yongzhi X, Shunxiang H, Huadong Z, Beisha T, Ruxu Z. Genotype-phenotype characteristics and baseline natural history of Chinese myelin protein zero gene related neuropathy patients. Eur J Neurol 2023; 30:1069-1079. [PMID: 36692866 DOI: 10.1111/ene.15700] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/24/2022] [Accepted: 12/30/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND AND PURPOSE The aim was to characterize the phenotypic and genotypic features of myelin protein zero (MPZ) related neuropathy and provide baseline data for longitudinal natural history studies or drug clinical trials. METHOD Clinical, neurophysiological and genetic data of 37 neuropathy patients with MPZ mutations were retrospectively collected. RESULTS Nineteen different MPZ mutations in 23 unrelated neuropathy families were detected, and the frequency of MPZ mutations was 5.84% in total. Mutations c.103_104InsTGGTTTACACCG, c.513dupG, c.521_557del and c.696_699delCAGT had not been reported previously. Hot spot mutation p.Thr124Met was detected in four unrelated families, and seven patients carried de novo mutations. The onset age indicated a bimodal distribution: prominent clustering in the first and fourth decades. The infantile-onset group included 12 families, the childhood-onset group consisted of two families and the adult-onset group included nine families. The Charcot-Marie-Tooth Disease Neuropathy Score ranged from 3 to 25 with a mean value of 15.85 ± 5.88. Mutations that changed the cysteine residue (p.Arg98Cys, p.Cys127Trp, p.Ser140Cys and p.Cys127Arg) in the extracellular region were more likely to cause severe early-onset Charcot-Marie-Tooth disease type 1B (CMT1B) or Dejerine-Sottas syndrome. Nonsense-mediated mRNA decay mutations p.Asp35delInsVVYTD, p.Leu174Argfs*66 and p.Leu172Alafs*63 were related to severe infantile-onset CMT1B or Dejerine-Sottas syndrome; however, mutation p.Val232Valfs*19 was associated with a relatively milder childhood-onset CMT1 phenotype. CONCLUSION Four novel MPZ mutations are reported that expand the genetic spectrum. De novo mutations accounted for 30.4% and were most related to a severe infantile-onset phenotype. Genetic and clinical data from this cohort will provide the baseline data necessary for clinical trials and natural history studies.
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Affiliation(s)
- Liu Lei
- Health Management Center, Third Xiangya Hospital, Central South University, Changsha, China
| | - Li Xiaobo
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Lin Zhiqiang
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Xie Yongzhi
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Huang Shunxiang
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Zhao Huadong
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Tang Beisha
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Zhang Ruxu
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
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Duan X, Liu X, Wang G, Gu W, Xu M, Hao Y, Dong M, Sun Q, Sun S, Chen Y, Wang W, Li J, Zhang Y, Cao Z, Fan D, Wang R, Da Y. Characterization of genotype-phenotype correlation with MORC2 mutated Axonal Charcot-Marie-Tooth disease in a cohort of Chinese patients. Orphanet J Rare Dis 2021; 16:244. [PMID: 34059105 PMCID: PMC8166055 DOI: 10.1186/s13023-021-01881-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 05/21/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Charcot-Marie-Tooth (CMT) disease is an exciting field of study, with a growing number of causal genes and an expanding phenotypic spectrum. The microrchidia family CW-type zinc finger 2 gene (MORC2) was newly identified as a causative gene of CMT2Z in 2016. We aimed to describe the phenotypic-genetic spectrum of MORC2-related diseases in the Chinese population. METHODS With the use of Sanger sequencing and Next Generation Sequencing (NGS) technologies, we screened a cohort of 284 unrelated Chinese CMT2 families. Pathogenicity assessments of MORC2 variants were interpreted according to the ACMG guidelines. Potential pathogenic variants were confirmed by Sanger sequencing. RESULTS We identified 4 different heterozygous MORC2 mutations in four unrelated families, accounting for 1.4% (4/284). A novel mutation c.1397A>G p. D466G was detected in family 1 and all affected patients presented with later onset axonal CMT with hyperCKemia. The patient in family 2 showed a spinal muscular atrophy (SMA)-like disease with cerebellar hypoplasia and mental retardation, with a hot spot de novo mutation c.260C>T p. S87L. The twin sisters in family 3 were identified as having the most common mutation c.754C>T p. R252W and suffered from axonal motor neuropathy with high variability in disease severity and duration. The patient in family 4 developed an early onset axonal motor and sensory neuropathy, with a reported mutation c.1220G>A p.C407Y. All identified mutations associated with MORC2-related neuropathies are localized in the N-terminal ATPase module. CONCLUSIONS Our study confirmed that MORC2-related neuropathies exist in the Chinese population at a relatively high mutation rate. We revealed a complex genotype-phenotype correlation with MORC2 mutations. This report adds a new piece to the puzzle of the genetics of CMT and contributes to a better understanding of the disease mechanisms.
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Affiliation(s)
- Xiaohui Duan
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China.
| | - Xiaoxuan Liu
- Department of Neurology, Peking University Third Hospital, Beijing, 100191, People's Republic of China
| | - Guochun Wang
- Department of Rheumatology and Immunology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Weihong Gu
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Min Xu
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Chang Chun Street, Beijing, 100053, People's Republic of China
| | - Ying Hao
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Mingrui Dong
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Qing Sun
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Shaojie Sun
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Yuanyuan Chen
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Wei Wang
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Jing Li
- Department of Clinical Research Institute, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Yuting Zhang
- Department of Clinical Research Institute, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China
| | - Zhenhua Cao
- Running Gene Inc., Beijing, 100191, People's Republic of China
| | - Dongsheng Fan
- Department of Neurology, Peking University Third Hospital, Beijing, 100191, People's Republic of China
| | - Renbin Wang
- Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, People's Republic of China.
| | - Yuwei Da
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Chang Chun Street, Beijing, 100053, People's Republic of China.
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Jordan A, Nagaraj A, Hoyle JC, Stino AM, Arnold WD, Elsheikh B. Elevated Creatinine Kinase in Peripheral Neuropathy Is Associated With Muscle Cramping. Front Neurol 2021; 12:613599. [PMID: 33633669 PMCID: PMC7902013 DOI: 10.3389/fneur.2021.613599] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 01/11/2021] [Indexed: 12/12/2022] Open
Abstract
Introduction: Serum Creatinine Kinase (CK) is a non-specific marker of muscle damage. There has been limited investigation of the association between peripheral neuropathy and CK elevation (hyperCKemia). Methods: We performed a chart review to investigate the CK level in peripheral neuropathies. Demographics, clinical history, physical exam, electrodiagnostic data, CK level, statin use, etiology of neuropathy, and concomitant neuromuscular disorders were recorded. HyperCKemia was defined using our laboratory cutoff values of >180 U/L (women) and >220 U/L (men). Results: We identified 450 patients with peripheral neuropathy who had CK testing, 92 (20.4%) of whom had hyperCKemia. Sixty-one of those patients (13.5% of the total figure) had a concomitant etiology that could explain the CK elevation. Thirty-one patients (6.9%) had no other identifiable etiology for their hyperCKemia beyond the neuropathy. The average CK level in the latter cohort with hyperCKemia was 376 U/L (women: 312 U/L; men: 444 U/L). The frequency of cramping was greater in patients with elevated vs. normal CK (p < 0.0001). Discussion: HyperCKemia can occur in patients with peripheral neuropathy and appears to associate with cramping.
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Affiliation(s)
- Allison Jordan
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Arun Nagaraj
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - J Chad Hoyle
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Amro Maher Stino
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - W David Arnold
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Bakri Elsheikh
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
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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: 21] [Impact Index Per Article: 7.0] [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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Taniguchi T, Ando M, Okamoto Y, Yoshimura A, Higuchi Y, Hashiguchi A, Shiga K, Hayashida A, Hatano T, Ishiura H, Mitsui J, Hattori N, Mizuno T, Nakagawa M, Tsuji S, Takashima H. Genetic spectrum of Charcot-Marie-Tooth disease associated with myelin protein zero gene variants in Japan. Clin Genet 2020; 99:359-375. [PMID: 33179255 PMCID: PMC7898366 DOI: 10.1111/cge.13881] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 11/04/2020] [Accepted: 11/04/2020] [Indexed: 12/24/2022]
Abstract
We aimed to reveal the genetic features associated with MPZ variants in Japan. From April 2007 to August 2017, 64 patients with 23 reported MPZ variants and 21 patients with 17 novel MPZ variants were investigated retrospectively. Variation in MPZ variants and the pathogenicity of novel variants was examined according to the American College of Medical Genetics standards and guidelines. Age of onset, cranial nerve involvement, serum creatine kinase (CK), and cerebrospinal fluid (CSF) protein were also analyzed. We identified 64 CMT patients with reported MPZ variants. The common variants observed in Japan were different from those observed in other countries. We identified 11 novel pathogenic variants from 13 patients. Six novel MPZ variants in eight patients were classified as likely benign or uncertain significance. Cranial nerve involvement was confirmed in 20 patients. Of 30 patients in whom serum CK levels were evaluated, eight had elevated levels. Most of the patients had age of onset >20 years. In another subset of 30 patients, 18 had elevated CSF protein levels; four of these patients had spinal diseases and two had enlarged nerve root or cauda equina. Our results suggest genetic diversity across patients with MPZ variants.
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Affiliation(s)
- Takaki Taniguchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Masahiro Ando
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Yuji Okamoto
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.,Department of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
| | - Akiko Yoshimura
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Yujiro Higuchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Akihiro Hashiguchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Kensuke Shiga
- Department of Neurology, Matsushita Memorial Hospital, Osaka, Japan.,Department of Neurology, Kyoto prefectural University of Medicine, Kyoto, Japan
| | - Arisa Hayashida
- Department of Neurology, Juntendo University School of Medicine, Tokyo, Japan
| | - Taku Hatano
- Department of Neurology, Juntendo University School of Medicine, Tokyo, Japan
| | - Hiroyuki Ishiura
- Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Jun Mitsui
- Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Nobutaka Hattori
- Department of Neurology, Juntendo University School of Medicine, Tokyo, Japan
| | - Toshiki Mizuno
- Department of Neurology, Kyoto prefectural University of Medicine, Kyoto, Japan
| | - Masanori Nakagawa
- Department of Neurology, Kyoto prefectural University of Medicine, Kyoto, Japan.,North Medical Center, Kyoto prefectural University of Medicine, Kyoto, Japan
| | - Shoji Tsuji
- Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Institute of Medical Genomics, International University of Health and Welfare, Chiba, Japan
| | - Hiroshi Takashima
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
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LRSAM1 variants and founder effect in French families with ataxic form of Charcot-Marie-Tooth type 2. Eur J Hum Genet 2019; 27:1406-1418. [PMID: 30996334 DOI: 10.1038/s41431-019-0403-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 03/17/2019] [Accepted: 03/26/2019] [Indexed: 11/08/2022] Open
Abstract
Currently only 25-30% of patients with axonal forms of Charcot-Marie-Tooth disease (CMT) receive a genetic diagnosis. We aimed to identify the causative gene of CMT type 2 in 8 non-related French families with a distinct clinical phenotype. We collected clinical, electrophysiological, and laboratory findings and performed genetic analyses in four different French laboratories. Seventy-two patients with autosomal dominant inheritance were identified. The disease usually started in the fourth decade and the clinical picture was dominated by sensory ataxia (80%), neuropathic pain (38%), and length-dependent sensory loss to all modalities. Electrophysiological studies showed a primarily axonal neuropathy, with possible isolated sensory involvement in milder phenotypes. Disease severity varied greatly but the clinical course was generally mild. We identified 2 novel variants in LRSAM1 gene: a deletion of 4 amino acids, p.(Gln698_Gln701del), was found in 7 families and a duplication of a neighboring region of 10 amino acids, p.(Pro702_Gln711dup), in the remaining family. A common haplotype of ~450 kb suggesting a founder effect was noted around LRSAM1 in 4 families carrying the first variant. LRSAM1 gene encodes for an E3 ubiquitin ligase important for neural functioning. Our results confirm the localization of variants in its catalytic C-terminal RING domain and broaden the phenotypic spectrum of LRSAM1-related neuropathies, including painful and predominantly sensory ataxic forms.
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8
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Fabrizi GM, Tamburin S, Cavallaro T, Cabrini I, Ferrarini M, Taioli F, Magrinelli F, Zanette G. The spectrum of Charcot-Marie-Tooth disease due to myelin protein zero: An electrodiagnostic, nerve ultrasound and histological study. Clin Neurophysiol 2017; 129:21-32. [PMID: 29136549 DOI: 10.1016/j.clinph.2017.09.117] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 09/13/2017] [Accepted: 09/29/2017] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Nerve ultrasound (US) data on myelin protein zero (MPZ)-related Charcot-Marie-Tooth disease (CMT) are lacking. To offer a comprehensive perspective on MPZ-related CMTs, we combined nerve US with clinics, electrodiagnosis and histopathology. METHODS We recruited 36 patients (12 MPZ mutations), and correlated nerve US to clinical, electrodiagnostic measures, and sural nerve biopsy. RESULTS According to motor nerve conduction velocity (MNCV) criteria, nine patients were categorized as "demyelinating" CMT1B, 17 as "axonal" CMT2I/J, and 10 as dominant "intermediate" CMTDID. Sural nerve biopsy showed hypertrophic de-remyelinating neuropathy with numerous complex onion bulbs in one patient, de-remyelinating neuropathy with scanty/absent onion bulbs in three, axonal neuropathy in two, mixed demyelinating-axonal neuropathy in five. Electrodiagnosis significantly differed in CMT1B vs. CMT2I/J and CMTDID subgroups. CMT1B had slightly enlarged nerve cross sectional area (CSA) especially at proximal upper-limb (UL) sites. CSA was negatively correlated to UL MNCV and not increased at entrapment sites. Major sural nerve pathological patterns were uncorrelated to UL nerve US and MNCV. CONCLUSIONS Sural nerve biopsy confirmed the wide pathological spectrum of MPZ-CMT. UL nerve US identified two major patterns corresponding to the CMT1B and CMT2I/J-CMTDID subgroups. SIGNIFICANCE Nerve US phenotype of MPZ-CMT diverged from those in other demyelinating peripheral neuropathies and may have diagnostic value.
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Affiliation(s)
- Gian Maria Fabrizi
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy; Neurology Division, Department of Neuroscience, AOUI Verona, Verona, Italy
| | - Stefano Tamburin
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy; Neurology Division, Department of Neuroscience, AOUI Verona, Verona, Italy.
| | - Tiziana Cavallaro
- Neurology Division, Department of Neuroscience, AOUI Verona, Verona, Italy
| | - Ilaria Cabrini
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy; Neurology Division, Department of Neuroscience, AOUI Verona, Verona, Italy
| | - Moreno Ferrarini
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy; Neurology Division, Department of Neuroscience, AOUI Verona, Verona, Italy
| | - Federica Taioli
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy; Neurology Division, Department of Neuroscience, AOUI Verona, Verona, Italy
| | - Francesca Magrinelli
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy; Neurology Division, Department of Neuroscience, AOUI Verona, Verona, Italy
| | - Giampietro Zanette
- Neurology Division, Pederzoli Hospital, Peschiera del Garda, Verona, Italy
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Luigetti M, Fabrizi GM, Bisogni G, Romano A, Taioli F, Ferrarini M, Bernardo D, Rossini PM, Sabatelli M. Charcot-Marie-Tooth type 2 and distal hereditary motor neuropathy: Clinical, neurophysiological and genetic findings from a single-centre experience. Clin Neurol Neurosurg 2016; 144:67-71. [DOI: 10.1016/j.clineuro.2016.03.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 02/28/2016] [Accepted: 03/08/2016] [Indexed: 10/22/2022]
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10
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Nishiyama S, Sugeno N, Tateyama M, Aoki M. Late-onset Charcot–Marie–Tooth disease type 1B due to a novel mutation in the extracellular disulfide bridge of MPZ gene. Clin Neurol Neurosurg 2013; 115:208-9. [DOI: 10.1016/j.clineuro.2012.04.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Revised: 04/26/2012] [Accepted: 04/28/2012] [Indexed: 11/25/2022]
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11
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Luigetti M, Fabrizi G, Taioli F, Conte A, Del Grande A, Sabatelli M. Clinical, electrophysiological and pathological findings of a patient with CMT2 due to the p.Ala738Val mitofusin 2 mutation. J Neurol Sci 2011; 307:168-70. [DOI: 10.1016/j.jns.2011.04.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2011] [Revised: 04/21/2011] [Accepted: 04/25/2011] [Indexed: 10/18/2022]
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12
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Taioli F, Cabrini I, Cavallaro T, Simonati A, Testi S, Fabrizi GM. Déjerine-Sottas syndrome with a silent nucleotide change of myelin protein zero gene. J Peripher Nerv Syst 2011; 16:59-64. [DOI: 10.1111/j.1529-8027.2011.00319.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mondelli M, Fabrizi GM. Some considerations on atypical cases of Charcot-Marie-Tooth disease and use of genetic testing in idiopathic polyneuropathies. Clin Neurol Neurosurg 2010; 112:745-6. [PMID: 20800965 DOI: 10.1016/j.clineuro.2010.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 07/20/2010] [Accepted: 08/03/2010] [Indexed: 11/30/2022]
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