Project description:This SuperSeries is composed of the following subset Series: GSE36741: In vivo and in vitro investigations of heterozygous nebulin knock-out mice reveal similarities with mild human form of nemaline myopathy [miRNA] GSE36743: In vivo and in vitro investigations of heterozygous nebulin knock-out mice reveal similarities with mild human form of nemaline myopathy [mRNA] Refer to individual Series
Project description:The aim of the study was to investigate whether the trefoil peptide genes, in concerted action with a miRNA regulatory network, were contributing to nutritional maintrenance. Using a Tff3 knock-out mouse model, 21 specific miRNAs were noted to be significantly deregulated when compared to the wild type strain.
Project description:The aim of the study was to investigate whether the trefoil peptide genes, in concerted action with a miRNA regulatory network, were contributing to nutritional maintrenance. Using a Tff2 knock-out mouse model, 48 specific miRNAs were noted to be significantly deregulated when compared to the wild type strain.
Project description:Nemaline myopathy (NM) is a genetically and clinically heterogeneous disease that is diagnosed based on the presence of nemaline rods on skeletal muscle biopsy. While NM has typically been classified by causative genes, disease severity or prognosis cannot be predicted well. The common pathological endpoint of nemaline rods (despite diverse genetic causes) and an unexplained range of muscle weakness suggests that shared secondary processes contributed to the pathogenesis of NM. We speculated that these processes could be identified through a proteome wide interrogation utilizing a mouse model of severe NM in combination with pathway validation and structural/functional analyses. A proteomic analysis was performed using skeletal muscle tissue from the Neb cKO, KI.Acta1H40Y, and TgACTA1D286G mouse models of nemaline myopathy as compared to their respective wild-type counterparts (Neb WT, WT.Acta1H40Y, and C57) to identify pathophysiologically relevant biological processes that might impact disease severity or provide new treatment targets. Downstream analyses utilizing Scaffold, RStudio, and Ingenuity Pathway Analysis identified mitochondrial dysfunction and stress-related signaling as being enriched in NM mouse datasets. Pathway validation revealed that proteins in mitochondrial and stress-related signaling pathways aggregated in NM muscle in a severity dependent manner and an increase in protein content was generally associated with more severe disease. Structural and functional mitochondrial analyses revealed that mitochondrial dysfunction also grades with disease severity. RCI measured by respirometry, ATP/ADP/phosphate content, and mitochondrial transmembrane potential were affected in a severity dependent manner with the Neb cKOs being the most abnormal, KI.Acta1H40Y being mildly affected, and the TgACTA1D286G being minimally affected. These studies identify mitochondrial dysfunction as a secondary process impacting disease severity in NM.
Project description:Nemaline myopathy (NM) is a genetic muscle disorder, notably caused by mutations in the NEB gene (NEB-NM). Here we investigated the efficacy of a four-week Mavacamten (myosin ATPase inhibitor) treatment using a NEB-NM mouse model. After the four weeks, soleus muscles were extracted, muscle fibres were isolated, and a global untargeted proteomics approach was employed. As presented in the data set, a lot of various proteins were affected by the treatment.
Project description:The aim of this study was to investigate the molecular mechanisms implicated in this mouse model of nemaline myopathy, and to further compare the molecular disease response in different skeletal muscles. For this purpose, snap frozen skeletla muscle specimens from wild type and transgenic for alpha tropomyosin slow mice were studied. Five different muscle types were used (diaphragm, plantaris, extensor digitorum longus, tibialis anterior, gastrocnemus). Mice were sacrificed between 7 and 10 months. RNA pools from 3-5 animals were created and each pool was hybridized to a U74Av2 Affymetrix GeneChip. Datasets from 36 GeneChips were included in this study. Keywords: disease mouse model analysis