| Title: |
Loss-of-function variants in the CAPN1 activator CD99L2 cause X-linked spastic ataxia |
| Authors: |
Menden, Benita; Incebacak Eltemur, Rana, D; Demidov, German; Sturm, Marc; Park, Joohyun; Huridou, Chrisovalantou; Fath, Florian; Nümann, Astrid; Baumann, Alexander; Diets, Illja, J; Dufke, Claudia; Regensburger, Martin; Rönnefarth, Maria; Wilke, Vera; van Os, Nienke; Vielhaber, Stefan; Rattay, Tim, W; Kohl, Zacharias; Peralta, Susana; Pereira Sena, Priscila; Kellner, Melanie; Weissert, Nadine; Traschütz, Andreas; Zeltner, Lena; Boelmans, Kai; Deininger, Natalie; Schütz, Leon; Gross, Caspar; Hinojosa Amaya, Ana Beatriz; Raupach, Katrin; Hengel, Holger; Harmuth, Florian; Admard, Jakob; Bader, Ingrid; Baumann, Sarah; Bender, Friedemann; Bevot, Andrea; Bischoff, Almut; Boschann, Felix; Buchert, Rebecca; Buchzik, Daniel; Casadei, Nicolas; Catarino, Claudia, B; Cordts, Isabell; Cremer, Kirsten; Doebler-Neumann, Marion; Ehmke, Nadja; Elbracht, Miriam; Falb, Ruth, J; Feindt, Thomas; Fleszar, Zofia; Gerstner, Lea; Gläser, Dieter; Grasshoff, Ute; Grosch, Sarah; Grundmann, Kathrin; Gutschalk, Alexander; Haaga, Manja; Hayer, Stefanie; Hehr, Ute; Hellenbroich, Yorck; Henn, Wolfram; Herr, Barbara; Herzog, Rebecca; Horber, Veronka; Deppe, Jonas; Kaiser, Nadja; Kehrer, Christiane; Kehrer, Martin; Kern, Jan; Keßler, Christoph; Khuller, Katharina; Klinkhammer, Hannah; Kotzaeridou, Urania; Krawitz, Peter; Kreiss, Martina; Küpper, Hanna; Kuster, Alice; Laugwitz, Lucia; Lesemann, Anne; Lichey, Nadine; Linden, Tobias; Macek, Boris; Magg, Janine; Mangold, Elisabeth; Manka, Eva; Marquardt, Iris; Mehnert, Karl; Mengel, David; Morlot, Susanne; Oehl-Jaschkowitz, Barbara; Pauly, Martje, G; Philipp, Melanie; Radelfahr, Florentine; Rautenberg, Maren; Riess, Angelika; Saft, Carsten; Schlotter-Weigel, Beate; Schmidt, Axel; Schwaibold, Eva, M C; Spahlinger, Veronika; Spranger, Stephanie; Steiner, Katharina Marie; Stendel, Claudia; Thieme, Andreas; Tzschach, Andreas; Velic, Ana; Wiethoff, Sarah; Wilke, Carlo; Züchner, Stephan; Zittel, Simone; van de Warrenburg, Bart; Husain, Ralf, A; Deschauer, Marcus; Distelmaier, Felix; Dufke, Andreas; Graessner, Holm; Hemmer, Bernhard; Jacobi, Heike; Klockgether, Thomas; Klopstock, Thomas; Kobeleva, Xenia; Korenke, Georg-Christoph; Kuechler, Alma; Kuhlenbäumer, Gregor; Kurth, Ingo; Nguyen, Huu Phuc; Wunderlich, Gilbert; Zeuner, Kirsten, E; Klebe, Stephan; Auer-Grumbach, Michaela; Butryn, Michaela; Winkler, Jürgen; Timmann, Dagmar; Synofzik, Matthis; Schüle, Rebecca; Schöls, Ludger; Ossowski, Stephan; Riess, Olaf; Weber, Jonasz, J; Haack, Tobias, B |
| Contributors: |
Institute of Medical Genetics and Applied Genomics Tübingen; Eberhard Karls Universität Tübingen = University of Tübingen; Physiopathologie des Adaptations Nutritionnelles (PhAN); Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Nantes Université - UFR de Médecine et des Techniques Médicales (Nantes Univ - UFR MEDECINE); Nantes Université - pôle Santé; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Santé; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ); Centre Hospitalier Universitaire de Nantes = Nantes University Hospital (CHU Nantes) |
| Source: |
ISSN: 2041-1723. |
| Publisher Information: |
CCSD; Nature Publishing Group |
| Publication Year: |
2026 |
| Collection: |
Université de Nantes: HAL-UNIV-NANTES |
| Subject Terms: |
[SDV]Life Sciences [q-bio] |
| Description: |
International audience ; Most patients with a rare movement disorder (MD) do not receive a molecular diagnosis, and the underlying genetic variants and mediating genes remain elusive. Here, we evaluate the diagnostic accuracy of conventional and next-generation sequencing-based genetic testing strategies in a cohort of 2,811 individuals with ataxia, spastic paraplegia and dystonia. Exome sequencing establishes genetic diagnoses in 19.3% of cases, and specificity of phenotypic features and age at testing are positive predictors. Genome analysis ‘beyond the exome’ increases the diagnostic yield by 7.5%, mostly due to the improved detection of structural variants and repeat expansions. Unsolved cases are included in the Solve-RD cohort and subjected to gene-burden analysis, providing evidence for loss-of-function variants in X-chromosomal CD99L2 causing spastic ataxia. Cellular studies show that the transmembrane protein CD99L2 occurs mainly in a ubiquitinated form and serves as an activating interactor of the calcium-dependent protease CAPN1. Ablation of cytoplasmic or extracellular domains of CD99L2 leads to its intracellular mislocalization and abrogation of its interplay with CAPN1. Transcriptome analysis in CD99L2 patient-derived fibroblasts reveals synaptic function-specific disturbances. Impaired CAPN1 activation and dysregulation of downstream neuronal pathways constitute the likely molecular cause for neurodegeneration. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1038/s41467-026-69337-9 |
| Availability: |
https://hal.inrae.fr/hal-05538810; https://hal.inrae.fr/hal-05538810v1/document; https://hal.inrae.fr/hal-05538810v1/file/Menden%20-%20Nature%20Communications%202026.pdf; https://doi.org/10.1038/s41467-026-69337-9 |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.26B01DD0 |
| Database: |
BASE |