Biallelic variants in SNUPN cause a limb girdle muscular dystrophy with myofibrillar-like features

Iruzubieta, Pablo; Damborenea, Alberto; Ioghen, Mihaela; Bajew, Simon; Fernandez-Torrón, Roberto; Töpf, Ana; Herrero-Reiriz, Álvaro; Epure, Diana; Vill, Katharina; Hernández-Laín, Aurelio; Manterola, María; Azkargorta, Mikel; Pikatza-Menoio, Oihane; Pérez-Fernandez, Laura; García-Puga, Mikel; Gaina, Gisela; Bastian, Alexandra; Streata, Ioana; Walter, Maggie C.; Müller-Felber, Wolfgang; Thiele, Simone; Moragón, Saioa; Bastida-Lertxundi, Nerea; López-Cortajarena, Aitziber; Elortza, Felix; Gereñu, Gorka; Alonso-Martin, Sonia; Straub, Volker; de Sancho, David; Teleanu, Raluca; López de Munain, Adolfo; Blázquez, Lorea

doi:10.1093/brain/awae046

Title: Biallelic variants in SNUPN cause a limb girdle muscular dystrophy with myofibrillar-like features

Journal Article · 15 February 2024 · Brain

DOI: https://doi.org/10.1093/brain/awae046 · OSTI ID:2403611

; Damborenea, Alberto; Ioghen, Mihaela; Bajew, Simon; Fernandez-Torrón, Roberto; Töpf, Ana; Herrero-Reiriz, Álvaro; Epure, Diana; Vill, Katharina;

; Manterola, María;

; Pikatza-Menoio, Oihane; Pérez-Fernandez, Laura; García-Puga, Mikel; Gaina, Gisela; Bastian, Alexandra; Streata, Ioana; Walter, Maggie C.; Müller-Felber, Wolfgang more »

Abstract Alterations in RNA-splicing are a molecular hallmark of several neurological diseases, including muscular dystrophies, where mutations in genes involved in RNA metabolism or characterized by alterations in RNA splicing have been described. Here, we present five patients from two unrelated families with a limb-girdle muscular dystrophy (LGMD) phenotype carrying a biallelic variant in SNUPN gene. Snurportin-1, the protein encoded by SNUPN, plays an important role in the nuclear transport of small nuclear ribonucleoproteins (snRNPs), essential components of the spliceosome. We combine deep phenotyping, including clinical features, histopathology and muscle MRI, with functional studies in patient-derived cells and muscle biopsies to demonstrate that variants in SNUPN are the cause of a new type of LGMD according to current definition. Moreover, an in vivo model in Drosophila melanogaster further supports the relevance of Snurportin-1 in muscle. SNUPN patients show a similar phenotype characterized by proximal weakness starting in childhood, restrictive respiratory dysfunction and prominent contractures, although inter-individual variability in terms of severity even in individuals from the same family was found. Muscle biopsy showed myofibrillar-like features consisting of myotilin deposits and Z-disc disorganization. MRI showed predominant impairment of paravertebral, vasti, sartorius, gracilis, peroneal and medial gastrocnemius muscles. Conservation and structural analyses of Snurportin-1 p.Ile309Ser variant suggest an effect in nuclear-cytosol snRNP trafficking. In patient-derived fibroblasts and muscle, cytoplasmic accumulation of snRNP components is observed, while total expression of Snurportin-1 and snRNPs remains unchanged, which demonstrates a functional impact of SNUPN variant in snRNP metabolism. Furthermore, RNA-splicing analysis in patients’ muscle showed widespread splicing deregulation, in particular in genes relevant for muscle development and splicing factors that participate in the early steps of spliceosome assembly. In conclusion, we report that SNUPN variants are a new cause of limb girdle muscular dystrophy with specific clinical, histopathological and imaging features, supporting SNUPN as a new gene to be included in genetic testing of myopathies. These results further support the relevance of splicing-related proteins in muscle disorders.

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Sponsoring Organization:: USDOE

OSTI ID:: 2403611

Journal Information:: Brain, Journal Name: Brain; ISSN 0006-8950

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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