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Next Generation Sequencing Analysis of Wild Type and SRSF1-MKO Skeletal Muscle Transcriptomes

ABSTRACT: Next Generation Sequencing Analysis of Wild Type and SRSF1-MKO Skeletal Muscle Transcriptomes

PROVIDER: PRJNA437841 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6825052_1.fastq.gz	Fastqsanger.gz
	SRR6825052_2.fastq.gz	Fastqsanger.gz
	SRR6825053_1.fastq.gz	Fastqsanger.gz
	SRR6825053_2.fastq.gz	Fastqsanger.gz

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Next Generation Sequencing Analysis of Wild Type and SRSF1-MKO Skeletal Muscle Transcriptomes

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RNAseq analysis of skeletal muscle transcriptomes from wild-type and LONP1 skeletal muscle specific knockout (LONP1-MKO) mice

Project description:Mitochondria serve diverse functions and are essential organelles that require continuous surveillance to maintaintheir integrity and function. LONP1 is an evolutionarily conservedserine peptidase that safeguards mitochondrial protein quality from yeast to human.To investigatethe physiological role of LONP1-mediated mitochondrial quality-control in skeletal musclein vivo, we generated skeletal muscle-specificLonp1-knockout mice (referred to as LONP1 MKO). We performedtranscriptome analysis by whole-genome gene expression profiling experiments in gastrocnemius (GC) muscle from both wild-type (WT) and LONP1-MKO mice. Knockout of LONP1 in skeletal muscle resulted in deregulation of 457 genes in 2-week-old mice and of 1922 genes in 6-week-old mice. Gene ontology analysis revealed that LONP1 deficiency triggers unfolded protein response (UPR) in skeletal muscle.Moreover, GSEA analysis of transcriptomic datain 6-week-old micefurther revealed that genes deregulated by LONP1 deficiency were significantly enriched during aging.Together, the transcriptional profiling results suggest a critical role of LONP1 in regulating skeletal muscle metabolism and health.

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RNAseq analysis of skeletal muscle transcriptomes from wild-type, LONP1 skeletal muscle specific knockout (LONP1 mKO) and LONP1ATF4 skeletal muscle double-knockout (LONP1ATF4 DmKO) mice.

Project description:Studying the molecular basis for the skeletal muscle mitochondrial stress response could potentially be targeted to counteract metabolic disorders such as obesity. We uncovered a crucial role for the mitochondrial protease LONP1 in controlling the muscle mitochondrial proteostasis stress response that governs systemic metabolic homeostasis. Skeletal muscle-specific ablation of LONP1 led to broad genomic reprogramming of muscle and protected the mice from HFD-induced obesity. To thoroughly analyze pathways that are affected by ATF4 deficiency in the context of LONP1 mKO, we performed RNA-Seq transcriptome analysis of skeletal muscles from WT, LONP1 mKO and LONP1ATF4 DmKO mice. We identified a total of 3017 differentially expressed genes with a cutoff of 1.5-fold, and p < 0.05. Surprisingly, we found that ATF4 loss blunted a subset of regulated genes in LONP1 mKO muscles, whereas the majority of differentially regulated genes in LONP1 mKO muscles were not affected by ATF4 ablation. GO analysis of ATF4-dependent genes regulated by LONP1 ablation revealed significant enrichment in amino acid metabolic processes, Interestingly, however, LONP1 deficiency induced activation of muscle UPR and UPR-related RNA processing as well as myokine pathways were not affected by ATF4 ablation. Therefore, our results highlight a ATF4-independent mechanism in mediating the UPRmt in mammals.

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