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EDMD-causing emerin mutant myogenic progenitors exhibit impaired differentiation using similar mechanisms

ABSTRACT: RNA sequencing was performed on proliferating and differentiating emerin-null myogenic progenitors expressing emerin and EDMD-causing emerin mutants to identify molecular pathways implicated in Emery-Dreifuss Muscular Dystrophy.

ORGANISM(S): Mus musculus

PROVIDER: GSE152226 | GEO | 2020/07/01

REPOSITORIES: GEO

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EDMD-causing emerin mutant myogenic progenitors exhibit impaired differentiation using similar mechanisms

Project description:EDMD-causing emerin mutant myogenic progenitors exhibit impaired differentiation using similar mechanisms

| PRJNA638664 | ENA

Expression profiling of differentiating emerin-null myogenic progenitor identifies molecular pathways implicated in their impaired differentiation

Project description:RNA sequencing was performed on proliferating and differentiating wildtype and emerin-null myogenic progenitors to identify molecular pathways implicated in Emery-Dreifuss Muscular Dystrophy.

2017-10-31 | GSE104560 | GEO

EDMD-Causing Emerin Mutant Myogenic Progenitors Exhibit Impaired Differentiation Using Similar Mechanisms.

Project description:Mutations in the gene encoding emerin (EMD) cause Emery-Dreifuss muscular dystrophy (EDMD1), an inherited disorder characterized by progressive skeletal muscle wasting, irregular heart rhythms and contractures of major tendons. The skeletal muscle defects seen in EDMD are caused by failure of muscle stem cells to differentiate and regenerate the damaged muscle. However, the underlying mechanisms remain poorly understood. Most EDMD1 patients harbor nonsense mutations and have no detectable emerin protein. There are three EDMD-causing emerin mutants (S54F, Q133H, and D95-99) that localize correctly to the nuclear envelope and are expressed at wildtype levels. We hypothesized these emerin mutants would share in the disruption of key molecular pathways involved in myogenic differentiation. We generated myogenic progenitors expressing wildtype emerin and each EDMD1-causing emerin mutation (S54F, Q133H, D95-99) in an emerin-null (EMD-/y) background. S54F, Q133H, and D95-99 failed to rescue EMD-/y myogenic differentiation, while wildtype emerin efficiently rescued differentiation. RNA sequencing was done to identify pathways and networks important for emerin regulation of myogenic differentiation. This analysis significantly reduced the number of pathways implicated in EDMD1 muscle pathogenesis.

| S-EPMC7349064 | biostudies-literature

DamID: Loss of a heterochromatin anchor rescues altered genome organization and EDMD muscle defects triggered by a laminopathy mutation

Project description:Point mutations in nuclear structural protein laminA produce rare and generally tissue-specific diseases called laminopathies. The introduction of a human Emery Dreifuss Muscular Dystrophy (EDMD)-inducing mutation (laminA-Y45C) into C. elegans lamin (LMN-Y59C), recapitulates many EDMD phenotypes, and results in hyper-sequestration of heterochromatic arrays at the nuclear periphery. Using muscle-specific Emerin Dam-ID we show that the LMN-Y59C mutation also leads to misorganization of endogenous chromatin. We find increased perinuclear anchoring primarily along chromosome arms, and enhanced release of chromosomal cores. Coincidentally, Y59C worms have reduced locomotion and compromised sarcomere integrity. By coupling this mutation with deletion of the perinuclear chromodomain protein CEC-4, which tethers H3K9-methylated chromatin, we rescue the EDMD-like physiology and ultrastructural defects in sarcomeres. It further counteracts the altered spatial organization of chromosomal sequences, particularly along chromosomal arms. The data in this submission refer to the identification of chromatin enriched at the nuclear periphery (as measured by interaction with Dam::EMR-1) in muscle cells of L3/L4 control animals or cec-4 mutants expressing either GFP::LMN-1 (wild type lamin) or GFP::LMN-1(Y59C).

2020-12-31 | GSE135850 | GEO

RNA-seq: Loss of a heterochromatin anchor rescues altered genome organization and EDMD muscle defects triggered by a laminopathy mutation

Project description:Point mutations in nuclear structural protein lamin A produce rare, tissue-specific diseases called laminopathies. The introduction of a human Emery Dreifuss Muscular Dystrophy (EDMD)-inducing mutation (lamin A-Y45C) into C. elegans lamin (LMN-Y59C), recapitulates many EDMD phenotypes, and correlates with hyper-sequestration of heterochromatic arrays at the nuclear periphery. Using muscle-specific emerin Dam-ID, we also document the misorganization of endogenous chromatin in the LMN-Y59C mutant. We score increased perinuclear positioning along chromosome arms, and enhanced release within chromosomal cores. Coincidentally, Y59C worms have reduced locomotion and compromised sarcomere integrity. By coupling the Y59C mutation with deletion of the perinuclear chromodomain protein CEC-4, which tethers H3K9-methylated chromatin, we rescue the EDMD-like physiology and ultrastructural defects in sarcomeres. Deletion of cec-4 also rescued the Y59C-induced changes in chromatin organization. The promoters of genes that change position in the LMN-Y59C mutant, are enriched for E2F (EFL-1/-2) binding sites, consistent with previous studies implicating the Rb-E2F interaction with lamin A in muscle dysfunction. Gene expression changes provoked by LMN-Y59C are also largely reversed by cec-4 deletion. In summary, the ablation of a perinuclear H3K9me-anchor can counteract the dominant muscle-specific defects provoked by a laminopathic mutation, implicating peripheral chromatin organization in the control of muscle integrity.

2020-12-31 | GSE136576 | GEO

The nuclear envelope protein Net39 is essential for muscle nuclear integrity and chromatin organization

Project description:Lamins and transmembrane proteins within the nuclear envelope regulate nuclear structure and chromatin organization. Nuclear Envelope Transmembrane Protein 39 (Net39) is muscle nuclear envelope protein whose functions in vivo have not been explored. We show that mice lacking Net39 succumb to severe myopathy and juvenile lethality, with concomitant disruption in nuclear integrity, chromatin accessibility, gene expression and metabolism. These abnormalities resemble those of Emery-Dreifuss muscular dystrophy (EDMD), caused by mutations in A-type Lamins (LMNA) and other genes, like Emerin (EMD). We observe that Net39 is downregulated in EDMD patients, implicating Net39 in the pathogenesis of this disorder. Our findings highlight the role of Net39 at the nuclear envelope in maintaining muscle chromatin organization, gene expression and function, and its potential contribution to the molecular etiology of EDMD.

2020-11-23 | GSE154850 | GEO

The nuclear envelope protein Net39 is essential for nuclear integrity, chromatin organization, and muscle growth (RNA-Seq)

Project description:Lamins and transmembrane proteins within the nuclear envelope are regulators of nuclear structure and chromatin organization. Nuclear Envelope Transmembrane Protein 39 (Net39) is a muscle-restricted nuclear envelope protein. We show that mice lacking Net39 succumb to severe myopathy and neonatal lethality, with concomitant disruption in nuclear integrity, chromatin accessibility, gene expression and metabolism. These abnormalities resemble those of Emery-Dreifuss muscular dystrophy (EDMD), caused by mutations in A-type Lamins (LMNA) and other genes, like Emerin (EMD). We observe that Net39 is downregulated in EDMD patients, implicating Net39 in the pathogenesis of this disorder. Our findings reveal an intimate role for the nuclear envelope in maintaining muscle chromatin organization, gene expression and function, and highlight the importance of Net39 in these processes and in the molecular etiology of EDMD.

2020-11-24 | GSE154849 | GEO

The nuclear envelope protein Net39 is essential for nuclear integrity, chromatin organization, and muscle growth (ChIP-Seq)

2020-11-24 | GSE154848 | GEO

The nuclear envelope protein Net39 is essential for nuclear integrity, chromatin organization, and muscle growth (ATAC-Seq)

2020-11-24 | GSE154847 | GEO

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.

2008-06-16 | E-GEOD-9397 | biostudies-arrayexpress

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