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Transcriptome analysis of the extremophile tardigrade Hypsibius exemplaris exposed to the DNA-damaging agent bleomycin

ABSTRACT: Transcriptome analysis of the extremophile tardigrade Hypsibius exemplaris exposed to the DNA-damaging agent bleomycin

PROVIDER: PRJNA714591 | ENA |

REPOSITORIES: ENA

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Transcriptome analysis of the extremophile tardigrade Hypsibius exemplaris exposed to the DNA-damaging agent bleomycin

Project description:Transcriptome analysis of the extremophile tardigrade Hypsibius exemplaris exposed to the DNA-damaging agent bleomycin

2024-05-07 | GSE168917 | GEO

The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation [Bleo_RNA-seq]

Project description:Tardigrades can survive remarkable doses of ionizing radiation, up to about 1000 times the lethal dose for humans. How they do so is incompletely understood. We found that the tardigrade Hypsibius exemplaris suffers DNA damage upon gamma irradiation, but damage is repaired. We show that tardigrades have a specific and robust response to ionizing radiation: irradiation induces a rapid and dramatic upregulation of many DNA repair genes. By expressing tardigrade genes in bacteria, we validate that increased expression of some repair genes can suffice to increase radiation tolerance. We show that at least one such gene is necessary for tardigrade radiation tolerance. Tardigrades’ ability to sense ionizing radiation and massively upregulate specific DNA repair pathway genes may represent an evolved solution for maintaining DNA integrity.

2024-04-12 | GSE253470 | GEO

The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation [IR_RNA-seq]

Project description:Tardigrades can survive remarkable doses of ionizing radiation, up to about 1000 times the lethal dose for humans. How they do so is incompletely understood. We found that the tardigrade Hypsibius exemplaris suffers DNA damage upon gamma irradiation, but damage is repaired. We show that this tardigrade has a specific and robust response to ionizing radiation: irradiation induces a rapid upregulation of many DNA repair genes. This upregulation is unexpectedly extreme, making some DNA repair transcripts among the most abundant transcripts in the animal. By expressing tardigrade genes in bacteria, we validate that increased expression of some repair genes can suffice to increase radiation tolerance. We show that at least one such gene is important for tardigrade radiation tolerance. We hypothesize that tardigrades’ ability to sense ionizing radiation and massively upregulate specific DNA repair pathway genes may represent an evolved solution for maintaining DNA integrity.

2024-04-12 | GSE240501 | GEO

Hypsibius exemplaris

Project description:Hypsibius exemplaris overview

| PRJNA1099749 | ENA

Proteomic analysis of global response to ionizing radiation in Hypsibius exemplaris

Project description:Recent studies have shown that proteins unique to tardigrades are involved in the remarkable ability of these small animals to withstand desiccation and ionizing radiation (IR). For resistance to IR, only one tardigrade unique protein has been identified so far: Dsup, for DNA damage suppressor, found in R. varieornatus and H. exemplaris. Rv-Dsup protects from DNA damage by X-rays in human cells, suggesting that DNA protection is important for resistance to IR. Here, we chose to investigate the role of DNA repair and search for novel tardigrade unique genes involved in resistance to IR. For this, we performed an unbiased proteome analysis of H. exemplaris either untreated, or at 4h post-irradiation, 24h post-irradiation and after Bleomycin treatment.

2024-06-17 | PXD043897 | Pride

The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation

Project description:The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation

| PRJNA1065858 | ENA

The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation [IR_RNA-seq]

Project description:The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation [IR_RNA-seq]

| PRJNA1003921 | ENA

The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation [Bleo_RNA-seq]

Project description:The tardigrade Hypsibius exemplaris dramatically upregulates DNA repair pathway genes in response to ionizing radiation [Bleo_RNA-seq]

| PRJNA1065867 | ENA

Ultrastructural analysis of the dehydrated tardigrade Hypsibius exemplaris unveils an anhydrobiotic-specific architecture.

Project description:Tardigrades can cope with adverse environmental conditions by turning into anhydrobiotes with a characteristic tun shape. Tun formation is an essential morphological adaptation for tardigrade entry into the anhydrobiotic state. The tun cell structure and ultrastructure have rarely been explored in tardigrades in general and never in Hypsibius exemplaris. We used transmission electron microscopy to compare cellular organization and ultrastructures between hydrated and anhydrobiotic H. exemplaris. Despite a globally similar cell organelle structure and a number of cells not significantly different between hydrated and desiccated tardigrades, reductions in the sizes of both cells and mitochondria were detected in dehydrated animals. Moreover, in anhydrobiotes, secretory active cells with a dense endoplasmic reticulum network were observed. Interestingly, these anhydrobiote-specific cells are in a close relationship with a specific extracellular structure surrounding each cell. It is possible that this rampart-like extracellular structure resulted from the accumulation of anhydrobiotic-specific material to protect the cells. Interestingly, after five hours of rehydration, the number of secretory cells decreased, and the specific extracellular structure began to disappear. Twenty-four hours after the beginning of rehydration, the cellular structure and ultrastructure were comparable to those observed in hydrated tardigrades.

| S-EPMC7062702 | biostudies-literature

RNA-Seq analysis of developmental, juvenile, and anhydrobiotic stages of Hypsibius dujardini and Ramazzottius varieornatus

Project description:Limno-terrestrial tardigrades enter a state called anhydrobiosis when exposed to desiccation, and acquire tolerance against various extreme environments. The anhydrobiotic tardigrade Hypsibius dujardini, is a non-pigmented tardigrade easy to culture and RNAi method have been established, therefore making it a model tardigrade for tardigrade molecular research. Previous genome assemblies of this tardigrade had increased size due to heterozygosity. Here, we have sequenced the genome of H. dujardini using single individual Illumina DNA-Seq data and PacBio long read data, and employed a heterozygosity aware assembly method to assemble a near-complete high quality genome. In order to annotate the genome with gene predictions, we conducted RNA-Sequencing of various stages of developmental, juvenile, adult, and anhydrobiotic stage H. dujardini and Ramazzottius varieornatus, a tardigrade capable of rapid anhydrobiosis entry, and used these data for gene prediction with BRAKER v1.9 or differential gene expression analysis of the active and anhydrobiotic stages.

2017-02-28 | GSE94295 | GEO

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