Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Multivalent binding of the tardigrade Dsup protein to chromatin promotes yeast survival and longevity upon exposure to oxidative damage

ABSTRACT: Tardigrades are remarkable in their ability to survive extreme environments. The damage suppressor (Dsup) protein is thought to contribute to their extreme resistance to reactive oxygen species (ROS) generated by irradiation. Here we show that expression of Ramazzottius varieornatus Dsup in Saccharomyces cerevisiae reduces oxidative DNA damage and extends lifespan in response to chronic oxidative genotoxicity. Dsup uses multiple modes of engagement with the nucleosomal H2A/H2B acidic patch, H3/H4 histone tails and DNA to bind across the yeast genome without bias. Effective chromatin binding and genome protection requires the Dsup HMGN-like motif and C-terminal sequences. These findings give precedent and mechanistic understanding for engineering an organism by physically shielding its genome to promote survival and longevity in the face of oxidative damage.

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE294019 | GEO | 2025/04/08

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Multivalent binding of the tardigrade Dsup protein to heterologous chromatin promotes yeast survival and longevity upon exposure to oxidative damage

Project description:Tardigrades are remarkable in their ability to survive extreme environments. The damage suppressor (Dsup) protein is thought responsible for their extreme resistance to reactive oxygen species (ROS) generated by irradiation. Here we show that expression of Ramazzottius varieornatus Dsup in Saccharomyces cerevisiae reduces oxidative DNA damage and extends the lifespan of budding yeast with chronic oxidative damage. This protection from ROS requires either the Dsup HMGN-like domain or sequences C-terminal to same. Dsup associates with no apparent bias across the yeast genome, using multiple modes of nucleosome binding; the HMGN-like region interacts with both the H2A/H2B acidic patch and H3/H4 histone tails, while the C-terminal region binds DNA. These findings give precedent for engineering an organism by physically shielding its genome to promote survival and longevity in the face of oxidative damage.

2024-01-14 | GSE237436 | GEO

Proteomics reveals how the tardigrade damage suppressor protein teaches transfected human cells to survive UV-C stress

Project description:The genome sequencing of the tardigrade Ramazzottius varieornatus revealed a unique nucleo-some-binding protein, named Damage Suppressor (Dsup), which resulted to be crucial for the extraordinary abilities of tardigrades in surviving extreme stresses, such as UV. Evidence in Dsup transfected human cells suggests that Dsup mediates an overall response of DNA damage signaling, DNA repair and cell cycle regulation resulting in an acquired resistance to stress. Given these promising outcomes, our study attempts to provide a wider comprehension of the molecular mechanisms modulated by Dsup in human cells, and to explore the Dsup-activated molecular pathways under stress. We performed a differential proteomic analysis of Dsup-transfected and control human cells, under basal condition and at 24-hour recovery after exposure to UV-C. We demonstrate by enrichment and network analyses, for the first time, that even in the absence of external stimuli and more significantly after stress, Dsup activates mech-anisms involved with the Unfolded Protein Response, the mRNA processing and stability, cyto-plasmic stress granules, the DNA Damage Response and the telomere maintenance. In conclu-sion, our results shed new light on Dsup-mediated protective mechanisms, and increase our knowledge of the molecular machineries of extraordinary protection against UV-C stress.

2023-07-31 | PXD037439 | Pride

RNA-Seq analysis of juvenile stages of Ramazzottius varieornatus

Project description:Tardigrades are microscopic organisms, famous for their tolerance against extreme environments. The establishment of rearing systems of multiple species has allowed for comparison of tardigrade physiology, in particular in embryogenesis. Interestingly, in-lab cultures of limnic species showed smaller variation in hatching timing than terrestrial species, suggesting a hatching regulation mechanism acquired by adaptation to their habitat. To this end, we screened for coordinated gene expression during the development of two species of tardigrades, Hypsibius exemplaris and Ramazzottius varieornatus, and observed induction of the arthropod molting pathway. Exposure of ecdysteroids and juvenile hormone analog affected egg hatching but not embryonic development in only the limnic H. exemplaris. These observations suggest a hatching regulation mechanism by the molting pathway in H. exemplaris.

2019-10-31 | GSE130111 | GEO

Transcriptome analysis of the extremotolerant Ramazzottius varieornatus exposed to 60Co gamma ray

Project description:Transcriptome sequencing of Ramazzottius varieornatus exposed to 500Gy gamma ray.

2021-04-21 | GSE166661 | GEO

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

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

Time-course RNA-Seq analysis of UVC exposed Ramazzottius varieornatus.

Project description:Time-course RNA-Seq analysis of Ramazzottius varieornatus exposed to UVC for up to 72 hours

2022-03-25 | GSE152753 | GEO