Nucleus-Independent Transgenerational Small RNA Inheritance in Caenorhabditis elegans
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ABSTRACT:
PROVIDER: PRJNA1018494 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR26099146.fastq.gz | Fastqsanger.gz | |||
| SRR26099147.fastq.gz | Fastqsanger.gz | |||
| SRR26099148.fastq.gz | Fastqsanger.gz | |||
| SRR26099149.fastq.gz | Fastqsanger.gz | |||
| SRR26099150.fastq.gz | Fastqsanger.gz |
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Project description:In C. elegans worms, epigenetic information transmits transgenerationally. Still, it is unknown whether the effects transfer to the next generation inside or outside of the nucleus. Here we use the tractability of gene-specific double-stranded RNA-induced silencing to demonstrate that RNAi can be inherited independently of any nuclear factors via mothers that are genetically engineered to transmit only their ooplasm but not the oocytes’ nuclei to the next generation. We characterize the mechanisms and, utilizing RNA sequencing, chimeric worms and sequence polymorphism between different isolates, identify endogenous small RNAs which, similarly to exogenous siRNAs, are inherited in a nucleus-independent manner. From an historical perspective, these results might be regarded as partial vindication of discredited cytoplasmic inheritance theories from the 19th century, such as Darwin’s “pangenesis” theory.
2023-09-22 | GSE243434 | GEO
Project description:In Caenorhabditis elegans worms, epigenetic information transmits transgenerationally. Still, it is unknown whether the effects transfer to the next generation inside or outside of the nucleus. Here, we use the tractability of gene-specific double-stranded RNA-induced silencing to demonstrate that RNA interference can be inherited independently of any nuclear factors via mothers that are genetically engineered to transmit only their ooplasm but not the oocytes' nuclei to the next generation. We characterize the mechanisms and, using RNA sequencing, chimeric worms, and sequence polymorphism between different isolates, identify endogenous small RNAs which, similarly to exogenous siRNAs, are inherited in a nucleus-independent manner. From a historical perspective, these results might be regarded as partial vindication of discredited cytoplasmic inheritance theories from the 19th century, such as Darwin's "pangenesis" theory.
| S-EPMC10599617 | biostudies-literature
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. There are 35 samples in total. We found that genetically WT descendents from mutants of the H3K4me3 modifying complex had extended longevity up until the F4 generation. Their lifespan returned to WT levels in the F5 generation. We performed microarrays to examine what gene expression differences there were between N2(WT) worms, +/+ (from wdr-5 mutant) worms, and wdr-5/wdr-5 in the F4 and the F5 generation. We analyzed L3 samples from the first and second days of egg laying in triplicate each. Samples consist of ~1000 worms each.
2011-10-18 | E-GEOD-31043 | biostudies-arrayexpress
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.
2011-10-19 | GSE31043 | GEO
Project description:Biomolecular condensates, such as stress and germ granules, often contain sub-compartments. For instance, the Caenorhabditis elegans germ granule, which localizes near the outer nuclear membrane of germ cell nuclei, is composed of at least four ordered compartments, each housing distinct sets of proteins and RNAs. How these compartments form and why they are spatially ordered remains poorly understood. Here, we show that the conserved RNA helicase DDX-19 defines another compartment of the larger C. elegans germ granule, which we term the D compartment. The D compartment exhibits properties of a liquid condensate and forms between the outer nuclear pore filament and other compartments of the germ granule. Two nuclear pore proteins, NPP-14 and GLEL-1, are required for its formation, suggesting that the D compartment localizes adjacent to the outer nuclear membrane via interactions with the nuclear pore. The loss of DDX-19, NPP-14, or GLEL-1 leads to functional defects, including aberrant formation of the other four germ granule compartments, a loss of germline immortality, and dysregulation of small RNA-based transgenerational epigenetic inheritance programs. Hence, we propose that a function of the D compartment is to anchor larger germ granules to nuclear pores, enabling germ granule compartmentalization and promoting transgenerational RNA surveillance.
2025-02-09 | PXD056752 | Pride
Project description:Some epigenetic modifications are inherited from one generation to the next, providing a potential mechanism for the inheritance of environmentally acquired traits. Transgenerational inheritance of RNA interference phenotypes in C. elegans provides an excellent model to study this phenomenon, and whilst studies have implicated both chromatin modifications and small RNA pathways in heritable silencing their relative contributions remain unclear. Here we demonstrate that the histone methyltransferases SET-25 and SET-32 are required for the establishment of a transgenerational silencing signal, but not for long-term maintenance of this signal between subsequent generations suggesting that transgenerational epigenetic inheritance is a multi-step process, with distinct genetic requirements for establishment and maintenance of heritable silencing. Furthermore, small RNA sequencing reveals that the abundance of secondary siRNA (thought to be the effector molecules of heritable silencing) does not correlate with silencing phenotypes. Together, our results suggest that the current mechanistic models of epigenetic inheritance are incomplete.
2018-10-30 | PXD008754 | Pride
Project description:Chromatin epimutations in transgenerational epigenetic inheritance
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Project description:Transcriptome analysis in transgenerational epigenetic inheritance
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Project description:Stress Resets Transgenerational Small RNA Inheritance
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Project description:Environmental compounds can promote epigenetic transgenerational inheritance of adult-onset disease in subsequent generations following ancestral exposure during fetal gonadal sex determination. The current study examined the ability of dioxin (2,3,7,8-tetrachlorodibenzo[p]dioxin, TCDD) to promote epigenetic transgenerational inheritance of disease and DNA methylation epimutations in sperm. Gestating F0 generation females were exposed to dioxin during fetal day 8 to 14 and adult-onset disease was evaluated in F1 and F3 generation rats. The incidences of total disease and multiple disease increased in F1 and F3 generations. Prostate disease, ovarian primordial follicle loss and polycystic ovary disease were increased in F1 generation dioxin lineage. Kidney disease in males, pubertal abnormalities in females, ovarian primordial follicle loss and polycystic ovary disease were increased in F3 generation dioxin lineage animals. Analysis of the F3 generation sperm epigenome identified 50 differentially DNA methylated regions (DMR) in gene promoters. These DMR provide potential epigenetic biomarkers for transgenerational disease and ancestral environmental exposures. Observations demonstrate dioxin exposure of a gestating female promotes epigenetic transgenerational inheritance of adult onset disease and sperm epimutations. Methylated sperm DNA was isolated from rats ancestrally exposed to dioxin (Hip). Three independent samples from the treatment group were obtained. Differential DNA methylation between treatment groups was determined using Nimblegen microarrays. Treated samples were paired with control samples and hybridized together on arrays (Hip1/Cip1, Hip2/Cip2, and Hip3/Cip3), resulting in three arrays for the treatment.
2014-07-22 | E-GEOD-59552 | biostudies-arrayexpress