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

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

PROVIDER: PRJNA595947 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10704335_1.fastq.gz	Fastqsanger.gz
	SRR10704335_2.fastq.gz	Fastqsanger.gz
	SRR10704336_1.fastq.gz	Fastqsanger.gz
	SRR10704336_2.fastq.gz	Fastqsanger.gz
	SRR10704337_1.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 [ChIP-Seq]

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

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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]

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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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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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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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