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Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy

ABSTRACT: Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy

PROVIDER: PRJNA509642 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11684416.fastq.gz	Fastqsanger.gz
	SRR8313500_1.fastq.gz	Fastqsanger.gz
	SRR8313500_2.fastq.gz	Fastqsanger.gz
	SRR8313510.fastq.gz	Fastqsanger.gz
	SRR8313501_1.fastq.gz	Fastqsanger.gz

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Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy [ChIP-seq]

Project description:Polycomb group of proteins (PcG) and the nuclear Lamin A are key factors in the maintenance of chromatin higher order structures required for preserving cell identity. Mutations in the Lamin A/C gene cause several diseases, belonging to the class of laminopathies, including Emery-Dreifuss Muscular Dystrophy. Nevertheless, epigenetic mechanisms involved in the pathogenesis of lamin-dependent dystrophy are still largely unknown. We show that Lamin A loss causes deregulated PcG positioning in muscular stem cells followed by upregulation of adipogenic markers and induction of the senescence’s driver p16INK4a from Cdkn2a locus. This aberrant transcriptional programme causes impairment in self-renewal, loss of cell identity and premature exhaustion of quiescent satellite cell pool. Genetic ablation of Cdkn2a locus restores muscle growth and muscle stem cell properties in Lamin A/C null dystrophic mice. In conclusion, our findings suggest that Lamin A has an essential role in preserving satellite cell self-renewal capacity and indicate that Lamin A-dependent muscular dystrophy can be ascribed to intrinsic epigenetic dysfunctions of muscle stem cells

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Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy [RNA-seq]

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Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy [RNA-seq]

Project description:Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy [RNA-seq]

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Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy [ChIP-seq]

Project description:Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy [ChIP-seq]

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Dysfunctional polycomb transcriptional repression contributes to lamin A/C-dependent muscular dystrophy.

Project description:Lamin A is a component of the inner nuclear membrane that, together with epigenetic factors, organizes the genome in higher order structures required for transcriptional control. Mutations in the lamin A/C gene cause several diseases belonging to the class of laminopathies, including muscular dystrophies. Nevertheless, molecular mechanisms involved in the pathogenesis of lamin A-dependent dystrophies are still largely unknown. The polycomb group (PcG) of proteins are epigenetic repressors and lamin A interactors, primarily involved in the maintenance of cell identity. Using a murine model of Emery-Dreifuss muscular dystrophy (EDMD), we show here that lamin A loss deregulated PcG positioning in muscle satellite stem cells, leading to derepression of non-muscle-specific genes and p16INK4a, a senescence driver encoded in the Cdkn2a locus. This aberrant transcriptional program caused impairment in self-renewal, loss of cell identity, and premature exhaustion of the quiescent satellite cell pool. Genetic ablation of the Cdkn2a locus restored muscle stem cell properties in lamin A/C-null dystrophic mice. Our findings establish a direct link between lamin A and PcG epigenetic silencing and indicate that lamin A-dependent muscular dystrophy can be ascribed to intrinsic epigenetic dysfunctions of muscle stem cells.

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Transcription profiling of human Facioscapulohumeral muscular dystrophy (FSHD) muscle profiles

Project description:Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal dominant disorder linked to contractions of the D4Z4 repeat array in the subtelomeric region of chromosome 4q. By comparing genome-wide gene expression data from muscle biopsies of patients with FSHD to those of 11 other neuromuscular disorders, we intend to identify disease-specific changes which are more likely to be involved in the early stages of the disease progression. The data will help to identify pathological mechanisms involved in FSHD. Experiment Overall Design: Comparison of the profiles of FSHD to 13 other conditions for disease-specific changes. The 13 conditions are NHM (Normal healthy muscle) n=15; JDM (Juvenile dermatomyositis) n=25; HSP (Human spastic paraplegia) n=4; FSHD (facioscapulohumeral dystrophy) unaffected n=5, affected n=9; FKRP (Fukutin related protein deficiency) n=7; ED-L (Emery-Dreifuss muscular dystrophy, lamin A/C deficiency) n=4; ED-E (Emery-Dreifuss muscular dystrophy, emerin deficiency) n=4; DYSF (dysferlinopathy) n=10; DMD (Duchenne Muscular Dystrophy) n=10; CALP (Calpain-3 deficiency) n=10; BMD (Becker Muscular Dystrophy) n=5; AQM (Acute quadriplegic myopathy) n=5; ALS (Amyotrophic lateral sclerosis) n=9.

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Polycomb dysfunctional transcriptional repression in muscle stem cells contributes to lamin dependent muscular dystrophy

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-02-04 | GSE123725 | GEO

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Laminin-deficient muscular dystrophy, dy/dy diaphragm

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