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Laššuthová P, Vill K, Erdem-Ozdamar S, Schröder JM, Topaloglu H, Horvath R, Müller-Felber W, Bansagi B, Schlotter-Weigel B, Gläser D, Neupauerová J, Sedláčková L, Staněk D, Mazanec R, Weis J, Seeman P, Senderek J. Novel SBF2 mutations and clinical spectrum of Charcot-Marie-Tooth neuropathy type 4B2. Clin Genet 2018; 94:467-472. [PMID: 30028002 DOI: 10.1111/cge.13417] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 07/04/2018] [Accepted: 07/17/2018] [Indexed: 12/27/2022]
Abstract
Biallelic SBF2 mutations cause Charcot-Marie-Tooth disease type 4B2 (CMT4B2), a sensorimotor neuropathy with autosomal recessive inheritance and association with glaucoma. Since the discovery of the gene mutation, only few additional patients have been reported. We identified seven CMT4B2 families with nine different SBF2 mutations. Revisiting genetic and clinical data from our cohort and the literature, SBF2 variants were private mutations, including exon-deletion and de novo variants. The neuropathy typically started in the first decade after normal early motor development, was predominantly motor and had a rather moderate course. Electrophysiology and nerve biopsies indicated demyelination and excess myelin outfoldings constituted a characteristic feature. While neuropathy was >90% penetrant at age 10 years, glaucoma was absent in ~40% of cases but sometimes developed with age. Consequently, SBF2 mutation analysis should not be restricted to individuals with coincident neuropathy and glaucoma, and CMT4B2 patients without glaucoma should be followed for increased intraocular pressure. The presence of exon-deletion and de novo mutations demands comprehensive mutation scanning and family studies to ensure appropriate diagnostic approaches and genetic counseling.
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Affiliation(s)
- P Laššuthová
- DNA Laboratory, Department of Pediatric Neurology, Charles University and University Hospital Motol, Prague, Czech Republic
| | - K Vill
- Department of Pediatric Neurology, Dr. v. Hauner Children's Hospital, LMU Munich, Munich, Germany
| | - S Erdem-Ozdamar
- Department of Neurology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - J M Schröder
- Institute of Neuropathology, RWTH Aachen University Hospital, Aachen, Germany
| | - H Topaloglu
- Department of Pediatric Neurology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - R Horvath
- Wellcome Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - W Müller-Felber
- Department of Pediatric Neurology, Dr. v. Hauner Children's Hospital, LMU Munich, Munich, Germany
| | - B Bansagi
- Wellcome Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - B Schlotter-Weigel
- Friedrich-Baur-Institute, Department of Neurology, University Hospital, LMU Munich, Munich, Germany
| | - D Gläser
- Genetikum, Center for Human Genetics, Neu-Ulm, Germany
| | - J Neupauerová
- DNA Laboratory, Department of Pediatric Neurology, Charles University and University Hospital Motol, Prague, Czech Republic
| | - L Sedláčková
- DNA Laboratory, Department of Pediatric Neurology, Charles University and University Hospital Motol, Prague, Czech Republic
| | - D Staněk
- DNA Laboratory, Department of Pediatric Neurology, Charles University and University Hospital Motol, Prague, Czech Republic
| | - R Mazanec
- Department of Neurology, Charles University and University Hospital Motol, Prague, Czech Republic
| | - J Weis
- Institute of Neuropathology, RWTH Aachen University Hospital, Aachen, Germany
| | - P Seeman
- DNA Laboratory, Department of Pediatric Neurology, Charles University and University Hospital Motol, Prague, Czech Republic
| | - J Senderek
- Friedrich-Baur-Institute, Department of Neurology, University Hospital, LMU Munich, Munich, Germany
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Laššuthová P, Beharka R, Krůtová M, Neupauerová J, Seeman P. COX6A1mutation causes axonal hereditary motor and sensory neuropathy - the confirmation of the primary report. Clin Genet 2015; 89:512-514. [DOI: 10.1111/cge.12649] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 07/10/2015] [Accepted: 07/28/2015] [Indexed: 11/28/2022]
Affiliation(s)
- P. Laššuthová
- Department of Paediatric Neurology, DNA Laboratory, 2nd Faculty of Medicine; Charles University in Prague and University Hospital Motol; Prague Czech Republic
| | - R. Beharka
- Department of Medical Genetics; The University Hospital Brno; Brno Czech Republic
| | - M. Krůtová
- Department of Paediatric Neurology, DNA Laboratory, 2nd Faculty of Medicine; Charles University in Prague and University Hospital Motol; Prague Czech Republic
| | - J. Neupauerová
- Department of Paediatric Neurology, DNA Laboratory, 2nd Faculty of Medicine; Charles University in Prague and University Hospital Motol; Prague Czech Republic
| | - P. Seeman
- Department of Paediatric Neurology, DNA Laboratory, 2nd Faculty of Medicine; Charles University in Prague and University Hospital Motol; Prague Czech Republic
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Laššuthová P, Brožková DŠ, Krůtová M, Neupauerová J, Haberlová J, Mazanec R, Dvořáčková N, Goldenberg Z, Seeman P. Mutations in HINT1 are one of the most frequent causes of hereditary neuropathy among Czech patients and neuromyotonia is rather an underdiagnosed symptom. Neurogenetics 2014; 16:43-54. [PMID: 25342199 DOI: 10.1007/s10048-014-0427-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 10/02/2014] [Indexed: 11/27/2022]
Abstract
Mutations in the HINT1 gene were recently discovered as being the major cause of autosomal recessive axonal neuropathy with neuromyotonia. This combination was clinically recognized and described previously in a few reports but is generally unknown. We aimed to establish the importance of HINT1 mutations as the cause of hereditary neuropathy and particularly hereditary motor neuropathy/axonal Charcot-Marie-Tooth (HMN/CMT2) among Czech patients. Overall, mutations in the HINT1 gene seem to be a surprisingly frequent cause of inherited neuropathy in our group of patients. Biallelic pathogenic mutations were found in 21 patients from 19 families. The prevalent mutation in the Czech population is the p.R37P (95% of pathogenic alleles). Clinically, all patients with biallelic mutations presented with early onset of symptoms at the end of the first decade. Foot/toe extension weakness to plegia was present in almost all patients. Neuromyotonia was present in all but two patients. However, it had been properly recognized in only three patients prior to molecular genetic diagnosis. HINT1 mutations seem to be one of the most frequent causes of inherited neuropathy and are probably the most frequent cause of HMN in Czech patients. We suggest all HMN/CMT2 patients be tested for the presence of the prevalent mutation, the p.R37P.
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Affiliation(s)
- P Laššuthová
- DNA Laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University in Prague and University Hospital Motol, V Úvalu 84, 150 06, Prague, Czech Republic,
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Mazanec R, Haberlová J, Šafka-Brožková D, Laššuthová P, Seeman P, Bojar M. 5. Electrophysiological features of peripheral and central nervous system in hereditary neuropathy Charcot Marie Tooth linked to X chromosome. Clin Neurophysiol 2014. [DOI: 10.1016/j.clinph.2013.12.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Abstract
Charcot-Marie-Tooth (CMT) neuropathy type 4C (CMT4C) is an autosomal recessive (AR), demyelinating neuropathy with early spine deformities caused by mutations in the SH3TC2 gene. To determine the spectrum of SH3TC2 mutations in the Czech population, the entire coding region of SH3TC2 was sequenced in 60 unrelated Czech patients. The prevalent mutation was shown to be the p.Arg954Stop. Therefore, 412 additional patients referred for CMT testing were tested for the presence of p.Arg954Stop only. Of 60 patients in whom the SH3TC2 gene was sequenced, at least one mutation was detected in 13 (21.7%) patients and biallelic pathogenic mutations were detected in 7 (11.6%) patients. Of the 412 patients tested for p.Arg954Stop, the mutation was found in 8 patients (1.94%), 6 were homozygous and 2 were heterozygous. The second causative mutation was detected by sequencing in one of the patients but not in the other. Nine novel sequence variants were detected. Their pathogenicity was further tested in silico and in control samples. Mutations in the SH3TC2 gene are a frequent cause of demyelinating hereditary neuropathy among Czech patients. In total, at least one mutation was found in 21 unrelated patients. CMT4C seems to be the most frequent type of AR CMT and one of the most frequent of all CMT types. Mutation p.Arg954Stop is highly prevalent in the Czech population. Patients with demyelinating neuropathy along with non-dominant mode of inheritance and negative for CMT1A/hereditary neuropathy with liability to pressure palsy should be tested for the presence of the p.Arg954Stop mutation or other mutations in the SH3TC2 gene.
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Affiliation(s)
- P Laššuthová
- DNA Laboratory, Department of Child Neurology, 2nd Medical School, University Hospital Motol, Prague, Czech Republic.
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