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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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