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Minimal expression of dysferlin prevents development of muscular dystrophy in dysferlin exon 40a knockout mice (second dataset)

ABSTRACT: Dysferlin is an essential muscle membrane repair protein and autosomal recessive mutations in its gene result in progressive muscular dystrophies collectively called dysferlinopathies. We previously showed that calpain-mediated cleavage within dysferlin exon 40a releases a 72kDa C-terminal minidysferlin recruited to injured sarcolemma. In the current study, we hypothesised that knocking out exon 40a will lead to defective membrane repair and development of muscular dystrophy over time. To address this hypothesis, we created three exon 40a knockout (40aKO) mouse lines with dysferlin protein levels ranging from ~80% of wildtype (WT) in 40aKO-3, ~50% in 40aKO-2 and ~10-20% in 40aKO-1 mice. Histopathological analysis of skeletal muscles harvested from all 12-month-old 40aKO mice showed little evidence of dystrophic features seen in dysferlin-null BLAJ mice. Lipidomics analysis on 18wk old quadriceps showed that all 40aKO lines had a similar lipidomic profile to WT and distinct from BLAJs. The proteomic profile of 40aKO lines was intermediate between that of WT and BLAJs. Laser membrane damage assays showed normal membrane repair capacity in all three 40aKO lines. These results collectively indicate that ~10-20% of dysferlin protein expression is sufficient for maintenance of the lipidome and membrane repair capacity, and crucially prevents development of muscular dystrophy.

INSTRUMENT(S):

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Thigh Muscle, Muscle Tissue

DISEASE(S): Limb-girdle Muscular Dystrophy

SUBMITTER: Chi Nam Ignatius Pang

LAB HEAD: Chi Nam Ignatius Pang

PROVIDER: PXD035918 | Pride | 2023-03-11

REPOSITORIES: Pride

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Minimal expression of dysferlin prevents development of dysferlinopathy in dysferlin exon 40a knockout mice.

Yasa Joe J Reed Claudia E CE Bournazos Adam M AM Evesson Frances J FJ Pang Ignatius I Graham Mark E ME Wark Jesse R JR Nijagal Brunda B Kwan Kim H KH Kwiatkowski Thomas T Jung Rachel R Weisleder Noah N Cooper Sandra T ST Lemckert Frances A FA

Acta neuropathologica communications 20230118 1

Dysferlin is a Ca<sup>2+</sup>-activated lipid binding protein implicated in muscle membrane repair. Recessive variants in DYSF result in dysferlinopathy, a progressive muscular dystrophy. We showed previously that calpain cleavage within a motif encoded by alternatively spliced exon 40a releases a 72 kDa C-terminal minidysferlin recruited to injured sarcolemma. Herein we use CRISPR/Cas9 gene editing to knock out murine Dysf exon 40a, to specifically assess its role in membrane repair and develo ...[more]

PMID: 36653852

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Project description:Transgenic overexpression of Galgt2 in the skeletal muscles of mdx mice inhibits the development of disease pathology associated with muscular dystrophy. This is the case both in transgenic mice, where Galgt2 overexpression occurs from embryonic timepoints onward and in mdx mice where Galgt2 is overexpressed in the early postnatal period using Adeno-associated virus (AAV). Here, we use gene expression profiling to compare transcriptional changes resulting from embryonic and postnatal Galgt2 overexpression in mdx skeletal muscle. A surprising number of changes were in genes known to ameliorate muscular dystrophy when overexpressed (agrin, integrin alpha 7, ADAM12, Bcl2) or to cause muscular dystrophy when mutated (collagen VI (alpha1,alpha2), plectin 1, dystroglycan, selenoprotein N1, integrin alpha7, biglycan, dysferlin). Several genes involved in calcium homeostasis were also changed. In Galgt2 transgenic mice, where embryonic overexpression of Galgt2 in skeletal muscles alters neuromuscular development and muscle growth, the number of gene expression changes was vastly greater, however, 14% of genes altered in postnatal AAV-Galgt2 infected mdx muscles were also changed with embryonic overexpression. These experiments suggest that postnatal overexpression of Galgt2 inhibits muscular dystrophy in mdx mice via induction of a group of genes that, in aggregate, can govern membrane stability, membrane repair, calcium homeostasis, and apoptosis. Transgenic overexpression of Galgt2 in the skeletal muscles of mdx mice inhibits the development of disease pathology associated with muscular dystrophy. This is the case both in transgenic mice, where Galgt2 overexpression occurs from embryonic timepoints onward and in mdx mice where Galgt2 is overexpressed in the early postnatal period using Adeno-associated virus (AAV). Here, we use gene expression profiling to compare transcriptional changes resulting from embryonic and postnatal Galgt2 overexpression in mdx skeletal muscle. A surprising number of changes were in genes known to ameliorate muscular dystrophy when overexpressed (agrin, integrin alpha7, ADAM12, Bcl2) or to cause muscular dystrophy when mutated (collagen VI (alpha1,alpha2), plectin 1, dystroglycan, selenoprotein N1, integrin alpha7, biglycan, dysferlin). Several genes involved in calcium homeostasis were also changed. In Galgt2 transgenic mice, where embryonic overexpression of Galgt2 in skeletal muscles alters neuromuscular development and muscle growth, the number of gene expression changes was vastly greater, however, 14% of genes altered in postnatal AAV-Galgt2 infected mdx muscles were also changed with embryonic overexpression. These experiments suggest that postnatal overexpression of Galgt2 inhibits muscular dystrophy in mdx mice via induction of a group of genes that, in aggregate, can govern membrane stability, membrane repair, calcium homeostasis, and apoptosis. Experiment Overall Design: Microarrays were done in three groups at a time. 1) Transgenic Overexpression of Galgt2 - comprised to Wild Type (WT), Galgt2 Transgenic (CT), Dystrophin-Deficient (mdx), and Galgt2 Transgenic and Dystrophin-Deficient (CTmdx) each in duplicate 2) AAV-Mediated Galgt2 Gene Delivery in to the mdx gastrocnemius muscle in the postnatal period - comprised of AAVGalgt2 and PBS each in duplicate, and 3) Myoblasts and myotubes - comptised of one sample each of C1C12 myoblasts and myotubes, C2C12 myoblasts and myotubes stably transfected with Galgt2

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	Deamidation__NQ_Sites.txt	Txt
	Dysf-f36-43.raw	Raw
	Dysf-f44-47.raw	Raw
	Dysf-f48-49.raw	Raw
	Dysf-f50-51.raw	Raw