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Homo sapiens strain:DNA | isolate:SA-Beta-beta-Galactosidase-CD34-Positive | breed:Whole Genome bisulfite sequencing

ABSTRACT: Active and senescent human hematopoietic stem and progenitor cell whole genome bisulfite sequencing

PROVIDER: PRJNA336432 | ENA |

REPOSITORIES: ENA

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Homo sapiens strain:Peripheral Blood | isolate:SA-Beta-beta-Galactosidase-CD34-Positive

Project description:Homo sapiens strain:Peripheral Blood | isolate:SA-Beta-beta-Galactosidase-CD34-Positive Raw sequence reads

| PRJNA336368 | ENA

Senescence‐associated β‐galactosidase reveals the abundance of senescent CD8+ T cells in aging humans

Project description:Aging leads to a progressive functional decline of the immune system, rendering the elderly increasingly susceptible to disease and infection. The degree to which immune cell senescence contributes to this decline remains unclear, however, since markers that label immune cells with classical features of cellular senescence accurately and comprehensively have not been identified. Using a second‐generation fluorogenic substrate for β‐galactosidase and multi‐parameter flow cytometry, we demonstrate here that peripheral blood mononuclear cells (PBMCs) isolated from healthy humans increasingly display cells with high senescence‐associated β‐galactosidase (SA‐βGal) activity with advancing donor age. The greatest age‐associated increases were observed in CD8+ T‐cell populations, in which the fraction of cells with high SA‐βGal activity reached average levels of 64% in donors in their 60 s. CD8+ T cells with high SA‐βGal activity, but not those with low SA‐βGal activity, were found to exhibit features of telomere dysfunction‐induced senescence and p16‐mediated senescence, were impaired in their ability to proliferate, developed in various T‐cell differentiation states, and had a gene expression signature consistent with the senescence state previously observed in human fibroblasts. Based on these results, we propose that senescent CD8+ T cells with classical features of cellular senescence accumulate to levels that are significantly higher than previously reported and additionally provide a simple yet robust method for the isolation and characterization of senescent CD8+ T cells with predictive potential for biological age.

2021-04-14 | GSE169009 | GEO

Micro bulk sequencing on murine Bleomycin-induced fibrotic lungs sorted on SA-β-Gal and GD3

Project description:Aging is marked by a progressive decline in physiological function, leading to an increased susceptibility to age-related diseases and cancer. On the cellular level, aging correlates with an accumulation of senescent cells, which play a dual role: they are critical for tissue homeostasis, yet their over-accumulation may drive pathological aging. We recently revealed that senescent cells could overexpress immunosuppressive molecules like the ganglioside GD3 at their cell surface to evade from immune surveillance and to facilitate their tolerogenicity. We investigate which cells expressed GD3 and whether this ganglioside could be considered as a new marker associated to senescence in a model of senescence associated disease: Bleomycin-induced lung fibrosis.

2024-04-04 | GSE262926 | GEO

Cowpea Bisulfite Epigenetics

Project description:Cowpea Bisulfite sequencing

| PRJEB52355 | ENA

Cowpea Bisulfite Epigenomics

Project description:Cowpea Bisulfite sequencing

| PRJEB52261 | ENA

Transcription factor occupancy is linked to DNA methylation turnover at active regulatory regions [Bisulfite-Seq]

Project description:Genome wide analysis revealed that distal regulatory elements form Low Methylated Regions (LMRs). Even though transcription factor binding is required for LMR formation, we show for the test case CTCF that actual occupancy does not distinguish DNA methylation states. However, in line with a dynamic model of binding and DNA methylation turnover, we find that the product of active demethylation, 5-hydroxymethylcytosine (5hmC), is enriched at LMRs. 5hmC is present at active regulatory regions in stem and somatic cells and as a result a substantial fraction of changes in 5hmC occurs at LMRs. This suggests that transcription factor binding mediates active turnover of DNA methylation as an integral part of reprogramming of regulatory regions. CTCF ChIP bisulfite sequencing in mouse embryonic stem cells and whole genome shotgun bisulfite sequencing of RESTko mouse embryonic stem (ES) cells

2013-12-24 | E-GEOD-39736 | biostudies-arrayexpress

High grade glioma methylation analysis using bisulfite and oxidative bisulfite-treatment

Project description:Bisulfite and oxidative bisulfite treated sample methylation analysis of IDH1 mutant and wild-type high grade human gliomas, to profile 5-methylcytosine (5mC) and 5-hydroxymethylcytosine (5hmC). Genomic DNA isolated directly from fresh-frozen human high grade glioma specimens.

2020-10-06 | GSE104723 | GEO

Single-base resolution analysis of active DNA demethylation using methylase-assisted bisulfite sequencing

Project description:Active DNA demethylation in mammals involves TET-mediated iterative oxidation of 5-methylcytosine (5mC)/5-hydroxymethylcytosine (5hmC) and subsequent excision repair of highly oxidized cytosine bases 5-formylcytosine (5fC)/5-carboxylcytosine (5caC) by Thymine DNA glycosylase (TDG). However, quantitative and high-resolution analysis of active DNA demethylation activity remains challenging. Here we describe M.SssI methylase-assisted bisulfite sequencing (MAB-seq), a method that directly maps 5fC/5caC at single-base resolution. Genome-wide MAB-seq allows systematic identification of 5fC/5caC in Tdg-depleted embryonic stem cells, thereby generating a base-resolution map of active DNA demethylome. A comparison of 5fC/5caC and 5hmC distribution maps indicates that catalytic processivity of TET enzymes correlates with local chromatin accessibility. MAB-seq also reveals strong strand asymmetry of active demethylation within palindromic CpGs. Integrating MAB-seq with other base-resolution mapping methods enables quantitative measurement of cytosine modification states at key transitioning steps of active demethylation pathway, and reveals a regulatory role of 5fC/5caC excision repair in active DNA demethylation cascade. Analysis of 5fC/5caC excision repair-dependent active DNA demethylome by MAB-seq in mouse embryonic stem cells.

2014-11-02 | E-GEOD-62631 | biostudies-arrayexpress

Differential expression of three alpha-galactosidase genes and a single beta-galactosidase gene from Aspergillus niger.

Project description: Not available

| S-EPMC91361 | biostudies-literature

Whole genome bisulfite sequencing of liver samples of five mammals (human, rhesus macaque, mouse, rat and dog)

Project description:This study aims to investigate the DNA methylation patterns at transcription factor binding regions and their evolutionary conservation with respect to binding activity divergence. We combined newly generated bisulfite-sequencing experiments in livers of five mammals (human, macaque, mouse, rat and dog) and matched publicly available ChIP-sequencing data for five transcription factors (CEBPA, HNF4a, CTCF, ONECUT1 and FOXA1). To study the chromatin contexts of TF binding subjected to distinct evolutionary pressures, we integrated publicly available active promoter, active enhancer and primed enhancer calls determined by profiling genome wide patterns of H3K27ac, H3K4me3 and H3K4me1.

2022-10-20 | E-MTAB-11946 | biostudies-arrayexpress

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