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Stehlíková K, Skálová D, Zídková J, Haberlová J, Voháňka S, Mazanec R, Mrázová L, Vondráček P, Ošlejšková H, Zámečník J, Honzík T, Zeman J, Magner M, Šišková D, Langová M, Gregor V, Godava M, Smolka V, Fajkusová L. Muscular dystrophies and myopathies: the spectrum of mutated genes in the Czech Republic. Clin Genet 2016; 91:463-469. [PMID: 27447704 DOI: 10.1111/cge.12839] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 07/12/2016] [Accepted: 07/14/2016] [Indexed: 01/12/2023]
Abstract
Inherited neuromuscular disorder (NMD) is a wide term covering different genetic disorders affecting muscles, nerves, and neuromuscular junctions. Genetic and clinical heterogeneity is the main drawback in a routine gene-by-gene diagnostics. We present Czech NMD patients with a genetic cause identified using targeted next-generation sequencing (NGS) and the spectrum of these causes. Overall 167 unrelated patients presenting NMD falling into categories of muscular dystrophies, congenital muscular dystrophies, congenital myopathies, distal myopathies, and other myopathies were tested by targeted NGS of 42 known NMD-related genes. Pathogenic or probably pathogenic sequence changes were identified in 79 patients (47.3%). In total, 37 novel and 51 known disease-causing variants were detected in 23 genes. In addition, variants of uncertain significance were suspected in 7 cases (4.2%), and in 81 cases (48.5%) sequence changes associated with NMD were not found. Our results strongly indicate that for molecular diagnostics of heterogeneous disorders such as NMDs, targeted panel testing has a high-clinical yield and should therefore be the preferred first-tier approach. Further, we show that in the genetic diagnostic practice of NMDs, it is necessary to take into account different types of inheritance including the occurrence of an autosomal recessive disorder in two generations of one family.
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Affiliation(s)
- K Stehlíková
- Centre of Molecular Biology and Gene Therapy, University Hospital Brno and Masaryk University, Brno, Czech Republic
| | - D Skálová
- Centre of Molecular Biology and Gene Therapy, University Hospital Brno and Masaryk University, Brno, Czech Republic
| | - J Zídková
- Centre of Molecular Biology and Gene Therapy, University Hospital Brno and Masaryk University, Brno, Czech Republic
| | - J Haberlová
- Department of Child Neurology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - S Voháňka
- Department of Neurology, University Hospital Brno, Brno, Czech Republic
| | - R Mazanec
- Department of Neurology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - L Mrázová
- Department of Child Neurology, University Hospital Brno, Brno, Czech Republic
| | - P Vondráček
- Department of Child Neurology, University Hospital Brno, Brno, Czech Republic
| | - H Ošlejšková
- Department of Child Neurology, University Hospital Brno, Brno, Czech Republic
| | - J Zámečník
- Department of Pathology and Molecular Medicine, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - T Honzík
- Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital, Prague, Czech Republic
| | - J Zeman
- Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital, Prague, Czech Republic
| | - M Magner
- Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital, Prague, Czech Republic
| | - D Šišková
- Child Neurology, Thomayer's Hospital, Prague, Czech Republic
| | - M Langová
- Department of Medical Genetics, Thomayer's Hospital, Prague, Czech Republic
| | - V Gregor
- Department of Medical Genetics, Thomayer's Hospital, Prague, Czech Republic
| | - M Godava
- Centre of Fetal Medicine and Genetics, Olomouc, Czech Republic
| | - V Smolka
- Department of Paediatrics, University Hospital Olomouc, Olomouc, Czech Republic
| | - L Fajkusová
- Centre of Molecular Biology and Gene Therapy, University Hospital Brno and Masaryk University, Brno, Czech Republic.,Central European Institute of Technology, Masaryk University, Brno, Czech Republic.,Laboratory of Functional Genomics and Proteomics, NCBR, Faculty of Science, Masaryk University, Brno, Czech Republic
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