학술논문
SNUPN deficiency causes a recessive muscular dystrophy due to RNA mis-splicing and ECM dysregulation
Document Type
Original Paper
Author
Nashabat, Marwan; Nabavizadeh, Nasrinsadat; Saraçoğlu, Hilal Pırıl; Sarıbaş, Burak; Avcı, Şahin; Börklü, Esra; Beillard, Emmanuel; Yılmaz, Elanur; Uygur, Seyide Ecesu; Kayhan, Cavit Kerem; Bosco, Luca; Eren, Zeynep Bengi; Steindl, Katharina; Richter, Manuela Friederike; Bademci, Guney; Rauch, Anita; Fattahi, Zohreh; Valentino, Maria Lucia; Connolly, Anne M.; Bahr, Angela; Viola, Laura; Bergmann, Anke Katharina; Rocha, Maria Eugenia; Peart, LeShon; Castro-Rojas, Derly Liseth; Bültmann, Eva; Khan, Suliman; Giarrana, Miriam Liliana; Teleanu, Raluca Ioana; Gonzalez, Joanna Michelle; Pini, Antonella; Schädlich, Ines Sophie; Vill, Katharina; Brugger, Melanie; Zuchner, Stephan; Pinto, Andreia; Donkervoort, Sandra; Bivona, Stephanie Ann; Riza, Anca; Streata, Ioana; Gläser, Dieter; Baquero-Montoya, Carolina; Garcia-Restrepo, Natalia; Kotzaeridou, Urania; Brunet, Theresa; Epure, Diana Anamaria; Bertoli-Avella, Aida; Kariminejad, Ariana; Tekin, Mustafa; von Hardenberg, Sandra; Bönnemann, Carsten G.; Stettner, Georg M.; Zanni, Ginevra; Kayserili, Hülya; Oflazer, Zehra Piraye; Escande-Beillard, Nathalie
Source
Nature Communications. 15(1)
Subject
Language
English
ISSN
2041-1723
Abstract
SNURPORTIN-1, encoded by SNUPN, plays a central role in the nuclear import of spliceosomal small nuclear ribonucleoproteins. However, its physiological function remains unexplored. In this study, we investigate 18 children from 15 unrelated families who present with atypical muscular dystrophy and neurological defects. Nine hypomorphic SNUPN biallelic variants, predominantly clustered in the last coding exon, are ascertained to segregate with the disease. We demonstrate that mutant SPN1 failed to oligomerize leading to cytoplasmic aggregation in patients’ primary fibroblasts and CRISPR/Cas9-mediated mutant cell lines. Additionally, mutant nuclei exhibit defective spliceosomal maturation and breakdown of Cajal bodies. Transcriptome analyses reveal splicing and mRNA expression dysregulation, particularly in sarcolemmal components, causing disruption of cytoskeletal organization in mutant cells and patient muscle tissues. Our findings establish SNUPN deficiency as the genetic etiology of a previously unrecognized subtype of muscular dystrophy and provide robust evidence of the role of SPN1 for muscle homeostasis.
SNURPORTIN-1, encoded by the SNUPN gene, plays a key role in the nuclear import of spliceosomal small nuclear ribonucleoproteins, however its physiological function remains unclear. Here the authors report that recessive SNUPN mutations cause a distinct subtype of childhood muscular dystrophy and reveal SNURPORTIN-1’s role in muscle homeostasis, offering insights for new therapeutic strategies.
SNURPORTIN-1, encoded by the SNUPN gene, plays a key role in the nuclear import of spliceosomal small nuclear ribonucleoproteins, however its physiological function remains unclear. Here the authors report that recessive SNUPN mutations cause a distinct subtype of childhood muscular dystrophy and reveal SNURPORTIN-1’s role in muscle homeostasis, offering insights for new therapeutic strategies.