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Saccharomyces cerevisiae

ABSTRACT: CAN1 Arginine Permease Deficiency Extends Yeast Replicative Lifespan via Translational Activation of Stress Response Genes

PROVIDER: PRJNA336542 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR4000290.fastq.gz	Fastqsanger.gz
	SRR4000300.fastq.gz	Fastqsanger.gz
	SRR4000291.fastq.gz	Fastqsanger.gz
	SRR4000301.fastq.gz	Fastqsanger.gz
	SRR4000292.fastq.gz	Fastqsanger.gz

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CAN1 Arginine Permease Deficiency Extends Yeast Replicative Lifespan via Translational Activation of Stress Response Genes

Project description:Transcriptional regulation plays an important role in the control of gene expression during aging. However, translation efficiency likely plays an equally important role in determining protein abundance, but has been relatively under studied in this context. Here we used RNA-seq and ribosome profiling to investigate the role of translational regulation in lifespan extension by CAN1 gene deletion in yeast. Through comparison of the transcriptional and translational changes in cells lacking CAN1 with other long-lived mutants, we were able to identify critical regulatory factors, including transcription factors and mRNA-binding proteins, that coordinate transcriptional and translational responses. Together, our data support a model in which deletion of CAN1 extends replicative lifespan through increased translation of proteins that facilitate cellular response to stress. This study extends our understanding of the importance of translational control in regulating stress resistance and longevity.

2017-02-20 | GSE85198 | GEO

RNAseq and ribosome profiling of yeast cells grown under glucose restriction condition.

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Multifarious translational regulation during replicative aging in yeast

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Ssd1 and Gcn2 suppress global translational efficiency in replicatively aged yeast, while their activation in young cells extends lifespan

Project description:Using ribosome profiling, we find globally reduced translation efficiency during mitotic / replicative aging in budding yeast. Two mechanisms contribute to this: Firstly, the mRNA binding protein Ssd1 is induced during aging, sequestering mRNAs to P-bodies and stress granules that are abundant in old cells. Indeed, overexpression of Ssd1 reduced protein synthesis in young cells and extended lifespan, while loss of Ssd1 reduced the translational deficit of old cells and shortened lifespan. Secondly, the Gcn2 kinase is activated in old cells, phosphorylating and inactivating the translational initiation factor eIF2α. Accordingly, deletion of GCN2 reduced the translational defect of old cells. Furthermore, overexpressing an uncharged tRNA to fully activate Gcn2, or overexpression of its downstream mediator, Gcn4, extended replicative lifespan in a manner that was mostly dependent on autophagy without inhibiting the TOR pathway. As such, Ssd1 induction, activation of the integrated stress response or autophagy are favorable TOR-independent therapeutic targets for lifespan extension.

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Deficiency of the RNA-binding protein Cth2 extends yeast replicative lifespan by alleviating its repressive effects on mitochondrial function

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Ssd1 and Gcn2 suppress global translational efficiency in replicatively aged yeast, while their activation in young cells extends lifespan

Project description:Ssd1 and Gcn2 suppress global translational efficiency in replicatively aged yeast, while their activation in young cells extends lifespan

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Project description:Here, we analyzed 76 ecologically diverse wild yeast isolates and discovered a wide diversity of replicative lifespan. Phylogenetic analyses pointed to genes and environmental factors that strongly interact to modulate the observed aging patterns. We then identified genetic networks causally associated with natural variation in replicative lifespan across wild yeast isolates, as well as genes, metabolites and pathways, many of which have never been associated with yeast lifespan in laboratory settings. In addition, a combined analysis of lifespan-associated metabolic and transcriptomic changes revealed unique adaptations to interconnected amino acid biosynthesis, glutamate metabolism and mitochondrial function in long-lived strains. Overall, our multi-omic and lifespan analyses across diverse isolates of the same species shows how gene-environment interactions shape cellular processes involved in phenotypic variation such as lifespan.

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