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Caenorhabditis elegans

ABSTRACT: Adult-specific trimethylation of histone H3 lysine 4 is prone to dynamic changes with aging in C. elegans somatic cells

PROVIDER: PRJNA396031 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5875890.fastq.gz	Fastqsanger.gz
	SRR5875900.fastq.gz	Fastqsanger.gz
	SRR5875910.fastq.gz	Fastqsanger.gz
	SRR5875891.fastq.gz	Fastqsanger.gz
	SRR5875901.fastq.gz	Fastqsanger.gz

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Adult-specific trimethylation of histone H3 lysine 4 is prone to dynamic changes with aging in C. elegans somatic cells

Project description:In this study, we profiled genome-wide pattern of tri-methylation of lysine 4 on histone H3 (H3K4me3) in the somatic cells of young and old C. elegans to investigate the changes of H3K4me3 during aging. In addition, we profiled H3K4me3 pattern in developmental stage L3. We found that H3K4me3 pattern in L3 is largely maintained in adults and the age-dynamic H3K4me3 are mainly adult stage specific. We profiled gene expression in young and old C. elegans somatic cells with ribo-RNAseq. The changes of H3K4me3 and RNA abundance are positively correlated.

2017-12-20 | GSE101964 | GEO

Caenorhabditis elegans

Project description:Tri-methylation of lysine 36 on H3 restricts gene expression variation during aging and impacts lifespan

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Project description:Amplification of siRNA in Caenorhabditis elegans generates a transgenerational sequence-targeted histone H3 lysine 9 methylation footprint

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Histone Demethylase UTX-1 Regulates the Caenorhabditis elegans Lifespan by Targeting the Insulin/IGF-1 Signaling Pathway

Project description:Epigenetic modifications are thought to be important for gene expression changes during development and aging. However, besides the Sir2 histone deacetylase in somatic tissues and H3K4 trimethylation in germlines, there is scant evidence implicating epigenetic regulations in aging. The insulin/IGF-1 signaling (IIS) pathway is a major lifespan regulatory pathway. Here we show that progressive increases in gene expression and loss of H3K27me3 on IIS components are due, at least in part, to increased activity of the H3K27 demethylase UTX-1 during aging. RNAi of the utx-1 gene extended the mean lifespan of C. elegans by ~30%, dependent on DAF-16 activity and not additive in daf-2 mutants. The loss of utx-1 increased H3K27me3 on the Igf1r/daf-2 gene and decreased IIS activity leading to a more "naive" epigenetic state. Like stem cell reprogramming, our results suggest that reestablishing epigenetic marks lost during aging might help "reset" the developmental age of animal cells. Examination of H3K27me3 in young and old worms without or with Utx-1 RNAi.

2011-11-22 | E-GEOD-29896 | biostudies-arrayexpress

Transgenerational epigenetic inheritance of longevity in Caenorhabditis elegans

Project description:Chromatin modifiers regulate lifespan in several organisms, raising the question of whether changes in chromatin states in the parental generation could be incompletely reprogrammed in the next generation and thereby affect the lifespan of descendents. The histone H3 lysine 4 trimethylation (H3K4me3) complex composed of ASH-2, WDR-5, and the histone methyltransferase SET-2 regulates C. elegans lifespan. Here we show that deficiencies in the H3K4me3 chromatin modifiers ASH-2, WDR-5, or SET-2 in the parental generation extend the lifespan of descendents up until the third generation. The transgenerational inheritance of lifespan extension by members of the ASH-2 complex is dependent on the H3K4me3 demethylase RBR-2, and requires the presence of a functioning germline in the descendents. Transgenerational inheritance of lifespan is specific for the H3K4me3 methylation complex and is associated with epigenetic changes in gene expression. Thus, manipulation of specific chromatin modifiers only in parents can induce an epigenetic memory of longevity in descendents.

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Caenorhabditis elegans

Project description:Endogenous germline nuclear RNAi-mediated transcriptional silencing and histone H3 lysine 9 methylation in defined regions of the Caenorhabditis elegans genome

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Histone Demethylase UTX-1 Regulates the Caenorhabditis elegans Lifespan by Targeting the Insulin/IGF-1 Signaling Pathway

2011-11-22 | GSE29896 | GEO

Caenorhabditis elegans

Project description:Genome-wide expression analysis during aging in C. elegans

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Endogenous siRNAs promote proteostasis and longevity in germline-less Caenorhabditis elegans

Project description:How lifespan and the rate of aging are set is a key problem in biology. Small RNAs are conserved molecules that impact diverse biological processes through the control of gene expression. However, in contrast to miRNAs, the role of endo-siRNAs in aging remains unexplored. Here, by combining deep sequencing and genomic and genetic approaches in C.CaenorhabditisC. elegans elegans, we reveal an unprecedented role for endo-siRNA molecules in the maintenance of proteostasis and lifespan extension in germline-less animals. Furthermore, we identify an endo-siRNA-regulated tyrosine phosphatase, which limits the longevity of germline-less animals by restricting the activity of the heat shock transcription factor HSF-1. Altogether, our findings point to endo-siRNAs as a link between germline removal and the HSF-1 proteostasis and longevity-promoting somatic pathway. This establishes a role for endo siRNAs in the aging process and identifies downstream genes and physiological processes that are regulated by the endo siRNAs to affect longevity.

2020-04-03 | GSE128935 | GEO

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