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Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice [ChIP-Seq]

ABSTRACT: Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice [ChIP-Seq]

PROVIDER: PRJNA595952 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10704348.fastq.gz	Fastqsanger.gz
	SRR10704349.fastq.gz	Fastqsanger.gz
	SRR10704350.fastq.gz	Fastqsanger.gz
	SRR10704351.fastq.gz	Fastqsanger.gz
	SRR10704352.fastq.gz	Fastqsanger.gz

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Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice

Project description:Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice

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Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice [RNA-Seq]

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Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice [ChIP-Seq]

Project description:Deletion of Lmna, encoding nuclear membrane protein LMNA, specifically in mouse cardiac myocytes activates BRD4 and leads to heart failure, arrhythmias, myocardial fibrosis, apoptosis, and premature death, which were partially rescued upon inhibition of BRD4.

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Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice [RNA-Seq]

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Inhibition of BRD4 Partially Rescues Dilated Cardiomyopathy and Cardiac Arrhythmias in Myocyte-Specific Lamin A/C Null Mice

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Deleterious assembly of the lamin A/C mutant p.S143P causes ER stress in familial dilated cardiomyopathy

Project description:Mutation of the LMNA gene, encoding nuclear lamin A and lamin C (hereafter lamin A/C), is a common cause of familial dilated cardiomyopathy (DCM). Among Finnish DCM patients, the founder mutation c.427T>C (p.S143P) is the most frequently reported genetic variant. Here, we show that p.S143P lamin A/C is more nucleoplasmic and soluble than wild-type lamin A/C and accumulates into large intranuclear aggregates in a fraction of cultured patient fibroblasts as well as in cells ectopically expressing either FLAG- or GFP-tagged p.S143P lamin A. In fluorescence loss in photobleaching (FLIP) experiments, non-aggregated EGFP-tagged p.S143P lamin A is significantly more dynamic. In in vitro association studies, p.S143P lamin A failed to form appropriate filament structures but instead assembled into disorganized aggregates similar to those observed in patient cell nuclei. A whole genome expression analysis revealed an elevated unfolded protein response (UPR) in cells expressing p.S143P lamin A/C. Additional endoplasmic reticulum (ER) stress induced by tunicamycin reduced the viability of mutant lamin expressing cells further. In summary, p.S143P lamin A/C affects normal lamina structure and influences the cellular stress response, homeostasis and viability. Total RNA obtained from 4 control and 7 patient cell lines

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Inhibition of BRD4 Rescues Cardiac phenotype in Myocyte-Specific Lamin A/C Null Mice

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Inhibition of BRD4 Rescues Cardiac phenotype in Myocyte-Specific Lamin A/C Null Mice

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TEAD1 trapping by the Q353R-Lamin A/C causes dilated cardiomyopathy.

Project description:• Mutations in the LMNA gene encoding Lamin A and C (Lamin A/C), major components of the nuclear lamina, cause laminopathies including dilated cardiomyopathy (DCM), but the underlying molecular mechanisms have not been fully elucidated. Here, by leveraging single-cell RNA-seq, ATAC-seq, protein array, and electron microscopy analysis, we show that insufficient structural maturation of cardiomyocytes owing to trapping of transcription factor TEAD1 by mutant Lamin A/C at the nuclear membrane underlies the pathogenesis of Q353R- LMNA-related DCM. Inhibition of the Hippo pathway rescued the dysregulation of cardiac developmental genes by TEAD1 in LMNA-mutant cardiomyocytes. Single-cell RNA-seq of cardiac tissues from DCM patients with the LMNA mutation confirmed the dysregulated expression of TEAD1 target genes. Our results propose an intervention for transcriptional dysregulation as a potential treatment of LMNA-related DCM.

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