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Project description:Comparative effects of Duchenne Muscular Dystrophy (DMD) and Aging in skeletal muscle Expression profiling established by microarray technology provides a powerful tool by which complex pathways can be assembled. The pathophysiology of Duchenne Muscular Dystrophy (DMD) is a complex process involving many pathways downstream of the primary genetic insult (lack of dystrophin). Similarly, the mechanisms implicated in muscle aging are only partially understood. The objective of the present study was to compare the muscle transcriptional response downstream of lack of dystrophin with the molecular events associated with aging using a muscle-dedicated microarray. Defining a common transcriptional profile in a range of wasting diseases should increase our understanding of the critical adaptations associated with muscle atrophy independent of the cause of the muscle wasting.
2011-11-01 | GSE32720 | GEO
Project description:Duchenne muscular dystrophy (DMD) is a fatal muscle-wasting disorder caused by mutations in the Dystrophin gene with no therapeutic option. To bridge the gap between preclinical and therapeutic evaluation studies, we have generated a rat model for DMD that carries an exon 52 deletion (R DMDdel52) causing a complete lack of dystrophin protein. Here we show that R DMDdel52 animals recapitulated human DMD pathophysiological trajectory more faithfully than the mdx mouse model. We report that R DMDdel52 rats displayed progressive and severe skeletal muscle loss associated with fibrotic deposition, fat infiltration and fibre type switch. Early fibrosis was also apparent in the cardiac muscle. These histological modifications led to severe muscle, respiratory and cardiac functional impairments leading to premature death around one year. Moreover, DMD muscle exhibited systemic inflammation with a mixed M1/M2 phenotype. A comparative single cell RNAseq analysis of the diaphragm muscle was performed, revealing cellular populations alteration and molecular modifications in all muscle cell types. We show that DMD fibroadipogenic progenitors produced elevated levels of cartilage oligomeric matrix protein (COMP), a glycoprotein responsible for modulating homeostasis of extracellular matrix, and whose increased concentration correlated with muscle fibrosis both in R DMDdel52 rats and human patients. Fibrosis is a component of tissue remodelling impacting the whole musculature of DMD patients, at the tissue level but most importantly at the functional level. We therefore propose that this specific biomarker can optimize the prognostic monitoring of functional improvement of patients included in clinical trials.
2022-03-14 | GSE198237 | GEO
Project description:Comparative effects of Duchenne Muscular Dystrophy (DMD) and Aging in skeletal muscle Expression profiling established by microarray technology provides a powerful tool by which complex pathways can be assembled. The pathophysiology of Duchenne Muscular Dystrophy (DMD) is a complex process involving many pathways downstream of the primary genetic insult (lack of dystrophin). Similarly, the mechanisms implicated in muscle aging are only partially understood. The objective of the present study was to compare the muscle transcriptional response downstream of lack of dystrophin with the molecular events associated with aging using a muscle-dedicated microarray. Defining a common transcriptional profile in a range of wasting diseases should increase our understanding of the critical adaptations associated with muscle atrophy independent of the cause of the muscle wasting. RNA samples from 4 DMD and 4 AGE skeletal muscle tissues were analyzed by hybridization against control samples. This hybridization was done on microarrays containing quadruplicate 50-mer oligonucleotides corresponding to 3,588 muscle relevant genes. Two hybridizations were per-formed for each subject. Thus, eight values per gene were obtained for each subject. These stringent conditions conferred powerful significance to our results.
2011-11-01 | E-GEOD-32720 | biostudies-arrayexpress
Project description:Duchenne muscular dystrophy is an X-linked monogenic disease caused by mutations in the dystrophin gene (DMD) and characterized by progressive muscle weakness leading to loss of ambulation and significantly decreased life expectancy. Since the current standard of care for Duchenne muscular dystrophy is to merely treat symptoms, there is a dire need for novel treatment modalities that can correct the underlying genetic mutations. While several gene replacement therapies are being explored in clinical trials, one emerging approach that can directly correct mutations in genomic DNA is base editing. We have recently developed CRISPR-SKIP, a base editing strategy to induce permanent exon skipping by introducing C>T or A>G mutations at splice acceptors in genomic DNA, which can be utilized therapeutically to recover dystrophin expression when a genomic deletion leads to an out-of-frame DMD transcript. We now demonstrate that CRISPR-SKIP can be adapted to correct some forms of Duchenne muscular dystrophy by disrupting the splice acceptor in human DMD exon 45 with high efficiency, which enables open reading frame recovery and restoration of dystrophin expression. We also demonstrate that AAV-delivered split-intein base editors edit the splice acceptor of DMD exon 45 in cultured human cells and in vivo, highlighting the therapeutic potential of this strategy.
2023-07-20 | GSE235673 | GEO
Project description:Duchenne muscular dystrophy (DMD) is a fatal X-linked disease caused by mutations in the dystrophin (DMD) gene, leading to the complete absence of DMD and progressive degeneration of skeletal and heart muscles. Expression of an internally shortened dystrophin in DMD subjects (DMDΔ52) can be achieved by skipping DMD exon 51 to reframe the transcript. To predict the best possible outcome of this therapeutic strategy, we generated transgenic pigs lacking DMD exon 51 and 52, additionally representing a new model for Becker muscular dystrophy (BMD). To inspect the proteome alterations caused by the different dystrophin mutations in an unbiased and comprehensive manner, we performed a label-free liquid chromatography-tandem mass spectrometry analysis (LC-MS/MS) of myocardial and skeletal muscle samples from wild-type (WT), DMDΔ52 and DMDΔ51-52 pigs.
2023-07-11 | PXD039533 | Pride
Project description:We have characterized the native urine derived stem cells (USCs) in order to understand if they could be an authologous, non-invasive, and cost effective in vitro model for research and diagnostic application in Duchenne muscular dystrophy disease
2021-11-10 | GSE162108 | GEO
Project description:Duchenne muscular dystrophy (DMD) is a fatal muscle disorder characterized by cycles of degeneration and regeneration of multinucleated myofibers and pathological activation of a variety of other associated cell types. Here, we describe the creation of a new mouse model of DMD caused by deletion of exon 51 of the dystrophin gene, which represents a prevalent mutation in humans. To understand the transcriptional abnormalities and heterogeneity associated with the nuclei of myofibers, as well as other mononucleated cell types that contribute to DMD disease pathogenesis, we performed single nucleus transcriptomics of skeletal muscle of mice with exon 51 deletion. Our results reveal distinctive and previously unrecognized myonuclear subtypes within dystrophic myofibers and uncover degenerative and regenerative transcriptional pathways underlying DMD pathogenesis. Our findings provide new insights into the molecular underpinnings of DMD, controlled by the transcriptional activity of different types of muscle and nonmuscle nuclei.
2020-11-05 | GSE156496 | GEO
Project description:Duchenne muscular dystrophy (DMD) is a fatal muscle disorder characterized by cycles of degeneration and regeneration of multinucleated myofibers and pathological activation of a variety of other associated cell types. Here, we describe the creation of a new mouse model of DMD caused by deletion of exon 51 of the dystrophin gene, which represents a prevalent mutation in humans. To understand the transcriptional abnormalities and heterogeneity associated with the nuclei of myofibers, as well as other mononucleated cell types that contribute to DMD disease pathogenesis, we performed single nucleus transcriptomics of skeletal muscle of mice with exon 51 deletion. Our results reveal distinctive and previously unrecognized myonuclear subtypes within dystrophic myofibers and uncover degenerative and regenerative transcriptional pathways underlying DMD pathogenesis. Our findings provide new insights into the molecular underpinnings of DMD, controlled by the transcriptional activity of different types of muscle and nonmuscle nuclei.
2020-11-05 | GSE156497 | GEO
Project description:Duchenne muscular dystrophy (DMD) is a genetic disease that results in the death of affected boys by early adulthood.The genetic defect responsible for DMD has been known for over 25 years, yet at present there is neither cure nor effective treatment for DMD. During early disease onset, the mdx mouse has been validated as an animal model for DMD and use of this model has led to valuable but incomplete insights into the disease process. For example, immune cells are thought to be responsible for a significant portion of muscle cell death in the mdx mouse; however, the role and time course of the immune response in the dystrophic process have not been well described. In this paper we constructed a simple mathematical model to investigate the role of the immune response in muscle degeneration and subsequent regeneration in the mdx mouse model of Duchenne muscular dystrophy. Our model suggests that the immune response contributes substantially to the muscle degeneration and regeneration processes. Furthermore, the analysis of the model predicts that the immune system response oscillates throughout the life of the mice, and the damaged fibers are never completely cleared.
2021-07-20 | BIOMD0000001015 | BioModels
Project description:Eosinophils are implicated in the development of many chronic diseases. However, their function in muscular dystrophy is understudied. Here we demonstrate that muscle hyper-eosinophilia could be a marker of poor outcomes in Duchenne Muscular Dystrophy.
2022-03-14 | GSE189846 | GEO