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Research paper
Comprehensive analysis of the mutation spectrum in 301 German ALS families
  1. Kathrin Müller1,
  2. David Brenner1,
  3. Patrick Weydt1,2,
  4. Thomas Meyer3,
  5. Torsten Grehl4,
  6. Susanne Petri5,
  7. Julian Grosskreutz6,
  8. Joachim Schuster1,
  9. Alexander E Volk7,8,
  10. Guntram Borck7,
  11. Christian Kubisch7,8,
  12. Thomas Klopstock9,10,
  13. Daniel Zeller11,
  14. Sibylle Jablonka12,
  15. Michael Sendtner12,
  16. Stephan Klebe11,13,
  17. Antje Knehr1,
  18. Kornelia Günther1,
  19. Joachim Weis14,
  20. Kristl G Claeys14,15,16,17,
  21. Berthold Schrank18,
  22. Anne-Dorte Sperfeld19,
  23. Annemarie Hübers1,
  24. Markus Otto1,
  25. Johannes Dorst1,
  26. Thomas Meitinger20,21,22,
  27. Tim M Strom20,21,22,
  28. Peter M Andersen1,23,
  29. Albert C Ludolph1,
  30. Jochen H Weishaupt1
  31. the German ALS network MND-NET
    1. 1Department of Neurology, Ulm University, Ulm, Germany
    2. 2Department of Neurodegenerative Diseases and Gerontopsychiatry, Bonn University, Bonn, Germany
    3. 3Department of Neurology, Charité Hospital, Humboldt University, Berlin, Germany
    4. 4Department of Neurology, Alfried Krupp Hospital, Essen, Germany
    5. 5Department of Neurology, Hannover Medical School, Hannover, Germany
    6. 6Department of Neurology, Jena University Hospital, Jena, Germany
    7. 7Institute of Human Genetics, Ulm University, Ulm, Germany
    8. 8Institute of Human Genetics, UniversityHospital Hamburg-Eppendorf, Hamburg, Germany
    9. 9Department of Neurology, Friedrich-Baur-Institut, University of Munich, Munich, Germany
    10. 10German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
    11. 11Department of Neurology, University of Würzburg, Würzburg, Germany
    12. 12Institute of Clinical Neurobiology, University Hospital of Würzburg, Würzburg, Germany
    13. 13Department of Neurology, University Duisburg-Essen, Essen, Germany
    14. 14Institute of Neuropathology, RWTH Aachen University Hospital, Aachen, Germany
    15. 15Department of Neurology, RWTH Aachen University Hospital, Aachen, Germany
    16. 16Department of Neurology, University Hospitals Leuven, Leuven, Belgium
    17. 17Laboratory for Muscle Diseases and Neuropathies, Department ofNeurosciences, Experimental Neurology, KU Leuven - University of Leuven, Leuven, Belgium
    18. 18Department of Neurology, DKD HELIOS Klinik Wiesbaden, Wiesbaden, Germany
    19. 19Department of Neurology, Martin Luther University of Halle-Wittenberg, Halle/Saale, Germany
    20. 20Institute of Human Genetics, Technische Universität München, Munich, Germany
    21. 21Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg, Germany
    22. 22Munich Cluster for Systems Neurology (SNergy), Munich, Germany
    23. 23Department of Pharmacology and Clinical Neuroscience, Umeå University, Umeå, Sweden
    1. Correspondence to Prof Jochen H Weishaupt, Department of Neurology, Ulm University, Ulm 89081, Germany; jochen.weishaupt{at}uni-ulm.de

    Abstract

    Objectives Recent advances in amyotrophic lateral sclerosis (ALS) genetics have revealed that mutations in any of more than 25 genes can cause ALS, mostly as an autosomal-dominant Mendelian trait. Detailed knowledge about the genetic architecture of ALS in a specific population will be important for genetic counselling but also for genotype-specific therapeutic interventions.

    Methods Here we combined fragment length analysis, repeat-primed PCR, Southern blotting, Sanger sequencing and whole exome sequencing to obtain a comprehensive profile of genetic variants in ALS disease genes in 301 German pedigrees with familial ALS. We report C9orf72 mutations as well as variants in consensus splice sites and non-synonymous variants in protein-coding regions of ALS genes. We furthermore estimate their pathogenicity by taking into account type and frequency of the respective variant as well as segregation within the families.

    Results 49% of our German ALS families carried a likely pathogenic variant in at least one of the earlier identified ALS genes. In 45% of the ALS families, likely pathogenic variants were detected in C9orf72, SOD1, FUS, TARDBP or TBK1, whereas the relative contribution of the other ALS genes in this familial ALS cohort was 4%. We identified several previously unreported rare variants and demonstrated the absence of likely pathogenic variants in some of the recently described ALS disease genes.

    Conclusions We here present a comprehensive genetic characterisation of German familial ALS. The present findings are of importance for genetic counselling in clinical practice, for molecular research and for the design of diagnostic gene panels or genotype-specific therapeutic interventions in Europe.

    • amyotrophic lateral sclerosis
    • genetics
    • whole exome sequencing

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    Footnotes

    • Contributors KM and JHW conceived the study. DB, PW, TMey, TG, SP, JG, JS, AEV, GB, CK, TK, DZ, SJ, MS, SK, AK, KG, JW, KGC, BS, A-DS, AH, MO, JD, TMei, TMS, PMA and ACL helped with the implementation. All authors contributed to the refinement of the study protocol and approved the final manuscript.

    • Funding This work was supported by grants from the German Society for Patients with Neuromuscular Diseases (DGM) and German Federal Ministry of Education and Research (BMBF; STRENGTH project and the German ALS network (MND-NET)). The work of AEV was funded by the Deutsche Forschungsgemeinschaft (DFG, VO 2028/1-1).

    • Competing interests None declared.

    • Patient consent Obtained.

    • Ethics approval This study was approved by the local medical ethics committees.

    • Provenance and peer review Not commissioned; externally peer reviewed.

    • Collaborators Ute Weyen, Andreas Hermann, Martin Regensburger, Jürgen Winkler, Ralf Linker, Beate Winner, Tim Hagenacker, Jan Christoph Koch, Paul Lingor, Bettina Göricke, Stephan Zierz, Berit Jordan, Petra Baum, Joachim Wolf, Andrea Winkler, Peter Young, Ulrich Bogdahn, Johannes Prudlo, Jan Kassubek, Karin Danzer.

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