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Metabolomic profiling reveals muscle metabolic changes following iliac arteriovenous fistula creation in mice (Aqueous)

ABSTRACT: In the present study, we hypothesize that the creation of an iliac AVF would result in significant alterations to the limb muscle metabolome. Recently, our group developed a new murine model to address the pathophysiology of access-related hand dysfunction (ARHD) in mice, where AVF creation is performed in the iliac artery/vein. Because of the anatomical location of the AVF creation, this model produces clinically relevant changes in the mouse hindlimb including hemodynamic alterations, muscle weakness, and mitochondrial function impairment.

ORGANISM(S): Mouse Mus Musculus

TISSUE(S): Muscle

SUBMITTER: Terence Ryan

PROVIDER: ST002189 | MetabolomicsWorkbench | Thu Feb 17 00:00:00 GMT 2022

REPOSITORIES: MetabolomicsWorkbench

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Project description:Alterations in RNA-splicing are a molecular hallmark of several neurological diseases, including muscular dystrophies where mutations in genes involved in RNA metabolism or characterised 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 magnetic resonance image (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 characterised by proximal weakness starting in childhood, restrictive respiratory dysfunction and prominent contractures, although interindividual 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 disorganisation. 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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Metabolomic profiling reveals muscle metabolic changes following iliac arteriovenous fistula creation in mice (Aqueous)

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