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Theuriet J, Fernandez-Eulate G, Latour P, Stojkovic T, Masingue M, Vidoni L, Bernard E, Jacquier A, Schaeffer L, Salort-Campana E, Chanson JB, Pakleza AN, Kaminsky AL, Svahn J, Manel V, Bouhour F, Pegat A. Genetic characterization of non-5q proximal spinal muscular atrophy in a French cohort: the place of whole exome sequencing. Eur J Hum Genet 2024; 32:37-43. [PMID: 37337091 PMCID: PMC10772122 DOI: 10.1038/s41431-023-01407-8] [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: 12/06/2022] [Revised: 05/15/2023] [Accepted: 06/07/2023] [Indexed: 06/21/2023] Open
Abstract
Proximal spinal muscular atrophy (SMA) is defined by a degeneration of the anterior horn cells resulting in muscle weakness predominantly in the proximal lower limbs. While most patients carry a biallelic deletion in the SMN1 gene (localized in chromosome 5q), little is known regarding patients without SMN1-mutation, and a genetic diagnosis is not always possible. Here, we report a cohort of 24 French patients with non-5q proximal SMA from five neuromuscular centers who all, except two, had next-generation sequencing (NGS) gene panel, followed by whole exome sequencing (WES) if gene panel showed a negative result. The two remaining patients benefited directly from WES or whole genome sequencing (WGS). A total of ten patients with causative variants were identified, nine of whom were index cases (9/23 families = 39%). Eight variants were identified by gene panel: five variants in DYNC1H1, and three in BICD2. Compound heterozygous causative variants in ASAH1 were identified directly by WES, and one variant in DYNC1H1 was identified directly by WGS. No causative variant was found using WES in patients with a previous panel with negative results (14 cases). We thus recommend using primarily NGS panels in patients with non-5q-SMA and using WES, especially when several members of the same family are affected and/or when trio analyses are possible, or WGS as second-line testing if available.
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Affiliation(s)
- Julian Theuriet
- Hôpital Neurologique Pierre Wertheimer, Service d'électroneuromyographie et de Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France.
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France.
| | - Gorka Fernandez-Eulate
- Nord/Est/Ile-De-France Neuromuscular Reference Center, Institut de Myologie, Hôpital Pitié-Salpêtrière, Assistance Publique des Hôpitaux de Paris, Paris, France
| | - Philippe Latour
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France
- Unité Fonctionnelle de Neurogénétique Moléculaire, Hospices Civils de Lyon, Groupement Est, Bron, France
| | - Tanya Stojkovic
- Nord/Est/Ile-De-France Neuromuscular Reference Center, Institut de Myologie, Hôpital Pitié-Salpêtrière, Assistance Publique des Hôpitaux de Paris, Paris, France
| | - Marion Masingue
- Nord/Est/Ile-De-France Neuromuscular Reference Center, Institut de Myologie, Hôpital Pitié-Salpêtrière, Assistance Publique des Hôpitaux de Paris, Paris, France
| | - Léo Vidoni
- Unité Fonctionnelle de Neurogénétique Moléculaire, Hospices Civils de Lyon, Groupement Est, Bron, France
| | - Emilien Bernard
- Hôpital Neurologique Pierre Wertheimer, Service d'électroneuromyographie et de Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France
- Hôpital Neurologique Pierre-Wertheimer, Service de Neurologie, Troubles du Mouvement et Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France
| | - Arnaud Jacquier
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France
- Centre de Biotechnologie Cellulaire, CBC Biotec, Hospices Civils de Lyon, Groupement Est, Bron, France
| | - Laurent Schaeffer
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France
- Centre de Biotechnologie Cellulaire, CBC Biotec, Hospices Civils de Lyon, Groupement Est, Bron, France
| | - Emmanuelle Salort-Campana
- Hôpital de la Timone, Maladies Neuromusculaires et SMA, Assistance Publique des Hôpitaux de Marseille, Marseille, France
| | - Jean-Baptiste Chanson
- Centre de Référence des Maladies Neuromusculaires Nord/Est/Ile-de-France, Service de Neurologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Aleksandra Nadaj Pakleza
- Centre de Référence des Maladies Neuromusculaires Nord/Est/Ile-de-France, Service de Neurologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Anne-Laure Kaminsky
- Service de Neurologie, Centre Référent des Maladies Neuromusculaires Rares, CHU de Saint Etienne, Saint-Etienne, France
| | - Juliette Svahn
- Hôpital Neurologique Pierre Wertheimer, Service d'électroneuromyographie et de Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France
- Hôpital Neurologique Pierre-Wertheimer, Service de Neurologie, Troubles du Mouvement et Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France
| | - Véronique Manel
- Hôpital Neurologique Pierre Wertheimer, Service d'électroneuromyographie et de Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France
- Hôpital Femme Mère Enfant, Service de Neuropédiatrie, Hospices Civils de Lyon, Groupement Est, Bron, France
| | - Françoise Bouhour
- Hôpital Neurologique Pierre Wertheimer, Service d'électroneuromyographie et de Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France
| | - Antoine Pegat
- Hôpital Neurologique Pierre Wertheimer, Service d'électroneuromyographie et de Pathologies Neuromusculaires, Hospices Civils de Lyon, Groupement Est, Bron, France
- Pathophysiology and Genetics of Neuron and Muscle, CNRS UMR 5261, INSERM U1315, Université Lyon1, Faculté de Médecine Lyon Est, Lyon, France
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Sabatelli M, Marangi G, Conte A, Tasca G, Zollino M, Lattante S. New ALS-Related Genes Expand the Spectrum Paradigm of Amyotrophic Lateral Sclerosis. Brain Pathol 2016; 26:266-75. [PMID: 26780671 DOI: 10.1111/bpa.12354] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 01/14/2016] [Indexed: 12/11/2022] Open
Abstract
Amyotrophic Lateral Sclerosis (ALS) is characterized by the degeneration of upper and lower motor neurons. Clinical heterogeneity is a well-recognized feature of the disease as age of onset, site of onset and the duration of the disease can vary greatly among patients. A number of genes have been identified and associated to familial and sporadic forms of ALS but the majority of cases remains still unexplained. Recent breakthrough discoveries have demonstrated that clinical manifestations associated with ALS-related genes are not circumscribed to motor neurons involvement. In this view, ALS appears to be linked to different conditions over a continuum or spectrum in which overlapping phenotypes may be identified. In this review, we aim to examine the increasing number of spectra, including ALS/Frontotemporal Dementia and ALS/Myopathies spectra. Considering all these neurodegenerative disorders as different phenotypes of the same spectrum can help to identify common pathological pathways and consequently new therapeutic targets in these incurable diseases.
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Affiliation(s)
- Mario Sabatelli
- Department of Geriatrics, Neurosciences and Orthopedics, Clinic Center NEMO-Roma. Institute of Neurology
| | - Giuseppe Marangi
- Institute of Medical Genetics, Catholic University School of Medicine, Rome, Italy
| | - Amelia Conte
- Department of Geriatrics, Neurosciences and Orthopedics, Clinic Center NEMO-Roma. Institute of Neurology
| | | | - Marcella Zollino
- Institute of Medical Genetics, Catholic University School of Medicine, Rome, Italy
| | - Serena Lattante
- Institute of Medical Genetics, Catholic University School of Medicine, Rome, Italy
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