RNAseq from neonatal mouse hindlimb muscles
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE75832 | GEO | 2015/12/10
SECONDARY ACCESSION(S): PRJNA305506
REPOSITORIES: GEO
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Project description:During neonatal development, skeletal muscle grows dramatically by myonuclei accretion to existing fibers and hypertophic growth of fibers with protein synthesis. To understand molecular mechanism underlying neonatal muscle growth, we used RNAseq to profile the global program of gene expressions especially involved in myoblast fusion, migration, and muscle fiber growth by itself. We used two biological replicates for each time point.
2015-12-10 | E-GEOD-75832 | biostudies-arrayexpress
Project description:During neonatal development, skeletal muscle grows dramatically by myonuclei accretion to existing fibers and hypertophic growth of fibers with protein synthesis. To understand molecular mechanism underlying neonatal muscle growth, we used microarray to profile the global program of gene expressions especially involved in myoblast fusion, migration, and muscle fiber growth by itself.
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Project description:During neonatal development, skeletal muscle grows dramatically by myonuclei accretion to existing fibers and hypertophic growth of fibers with protein synthesis. To understand molecular mechanism underlying neonatal muscle growth, we used microarray to profile the global program of gene expressions especially involved in myoblast fusion, migration, and muscle fiber growth by itself. Mouse hindlimb muscles at postnatal day (P) 2, 7, and 14 were isolated and used for RNA extraction and hybridyzation on microarrays. We used three biological replicates for each time point.
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Project description:Skeletal muscle fibers are large syncytia but it is currently unknown whether gene expression is coordinately regulated in their numerous nuclei. By snRNA-seq and snATAC-seq, we showed that slow, fast, myotendinous and neuromuscular junction myonuclei each have different transcriptional programs, associated with distinct chromatin states and combinations of transcription factors. In adult mice, identified myofiber types predominantly express either a slow or one of the three fast isoforms of Myosin heavy chain (MYH) proteins, while a small number of hybrid fibers can express more than one MYH. By snRNA-seq and FISH, we showed that the majority of myonuclei within a myofiber are synchronized, coordinately expressing only one fast Myh isoform with a preferential pane of muscle-specific genes. Importantly, this coordination of expression occurs early during post-natal development and depends on innervation. These findings highlight a unique mechanism of coordination of gene expression in a syncytium.
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