Ontology highlight
ABSTRACT:
PROVIDER: PRJNA873787 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:External ionizing Irradiation of pregnant mice at E13.5 4 Gy, gene expression at E17.5 On E13.5, female C57Bl/6HN mice were irradiated (total body) at 0 Gy (sham) or 4 Gy using a Gamma Cell cesium irradiator (JL Shepherd, San Fernando, CA), with a dose rate of 70 cGy/min. The mice were monitored for 4 days, and on E17.5, they were sacrificed, and placentas were procured and processed for RNA extrtaction.
2013-08-16 | E-GEOD-49923 | biostudies-arrayexpress
Project description:The delta smelt (Hypomesus transpacificus) is a pelagic fish species endemic to the Sacramento-San Joaquin Estuary in Northern California, listed as endangered under both the USA Federal and Californian State Endangered Species Acts and acts as an indicator of ecosystem health in its habitat range. Interrogative tools are required to successfully monitor effects of contaminants upon the delta smelt, and to research potential causes of population decline in this species. We used microarray technology to investigate genome-wide effects in 57-day old larvae after a 4-day exposure to ammonia; one of multiple contaminants arising from wastewater treatment plants and agricultural runoff. Genomic assessments were carried out between larvae exposed to 10 mg/L total ammonium; the lowest observed effect concentration (LOEC), and controls.
2011-05-05 | GSE29089 | GEO
Project description:The delta smelt (Hypomesus transpacificus) is a pelagic fish species endemic to the Sacramento-San Joaquin Estuary in Northern California, listed as endangered under both the USA Federal and Californian State Endangered Species Acts and acts as an indicator of ecosystem health in its habitat range. Interrogative tools are required to successfully monitor effects of contaminants upon the delta smelt, and to research potential causes of population decline in this species. We used microarray technology to investigate genome-wide effects in 47-day old larvae after a 7-day exposure to ambient water samples from the Sacramento River at a monitoring field station (Hood) situated 8 miles downstream of the Sacramento regional Wastewater Treatment Plant. Genomic assessments were carried out on surviving organisms and contrasted to laboratory controls.
2012-09-20 | GSE40991 | GEO
Project description:The mutually exclusive expression of virulence genes is critical for the immune evasion and pathogenesis of malaria parasites, Plasmodium falciparum, in human host. The three-dimensional genome structure has emerged as a new factor involved in transcriptional regulation of virulence gene families in the parasites. However, the mechanism controlling this epigenetic regulation pathway remains elusive. Here, we have identified the highly conserved high mobility group protein HMGB1 as a critical architectural regulator in establishment of high-order genome structure via interaction with centromeres in P. falciparum. Genetic manipulation of Pfhmgb1 gene and Hi-C analysis showed that the boundary of telomere and centromere clusters in an opposite spatial relationship in the nucleus was disrupted upon hmgb1 knockout. The collapse of euchromatic centromere cluster from nuclear periphery towards the opposite heterochromatic telomere cluster triggered relocation of the original active var gene, which resulted in complete silence of the entire repertoire of var gene family. ChIP-seq and fluorescence assay analysis confirmed the specific interaction between PfHMGB1 and centromeres. Meanwhile, as in other eukaryotes, PfHMGB1 was also widely present on the promoter regions of a variety of genes and co-regulated transcription, including other non-var variant gene families, suggesting multiple dimensions of epigenetic gene regulation by PfHMGB1. Finally, the natural genome organization could be reconstructed by hmgb1 gene complementation, which rescued the mutually exclusive expression of virulence genes. Taken together, our work provides new insight into the evolution of biological functions of the HMG architectural superfamily in eukaryotes.
2021-04-14 | GSE141761 | GEO
Project description:The mutually exclusive expression of virulence genes is critical for the immune evasion and pathogenesis of malaria parasites, Plasmodium falciparum, in human host. The three-dimensional genome structure has emerged as a new factor involved in transcriptional regulation of virulence gene families in the parasites. However, the mechanism controlling this epigenetic regulation pathway remains elusive. Here, we have identified the highly conserved high mobility group protein HMGB1 as a critical architectural regulator in establishment of high-order genome structure via interaction with centromeres in P. falciparum. Genetic manipulation of Pfhmgb1 gene and Hi-C analysis showed that the boundary of telomere and centromere clusters in an opposite spatial relationship in the nucleus was disrupted upon hmgb1 knockout. The collapse of euchromatic centromere cluster from nuclear periphery towards the opposite heterochromatic telomere cluster triggered relocation of the original active var gene, which resulted in complete silence of the entire repertoire of var gene family. ChIP-seq and fluorescence assay analysis confirmed the specific interaction between PfHMGB1 and centromeres. Meanwhile, as in other eukaryotes, PfHMGB1 was also widely present on the promoter regions of a variety of genes and co-regulated transcription, including other non-var variant gene families, suggesting multiple dimensions of epigenetic gene regulation by PfHMGB1. Finally, the natural genome organization could be reconstructed by hmgb1 gene complementation, which rescued the mutually exclusive expression of virulence genes. Taken together, our work provides new insight into the evolution of biological functions of the HMG architectural superfamily in eukaryotes.
2021-04-14 | GSE141760 | GEO
Project description:The sinoatrial node (SAN) is the primary pacemaker of the heart. The human SAN is poorly understood due to limited primary tissue access and lack of robust in vitro derivation methods. We developed an efficient strategy, using a dual SHOX2:GFP; MYH6:mCherry knock-in reporter line, to generate and purify human pluripotent stem cell-derived SAN cells (hPSC-SAN), displaying molecular and electrophysiological characteristics of bona-fide nodal cells. We modeled cell type specific toxicity upon treatment with doxorubicin (DOXO) using hPSC-SAN generated from a library of induced pluripotent stem cells (iPSCs). We discovered 3 new genetic loci associated with increased sensitivity to DOXO-induced hPSC-SAN death. Genetic variants in these loci were associated with significantly higher early arrhythmia risk in patients receiving DOXO, confirmed by an unbiased PheWAS analysis. Finally, the in vitro DOXO assay enabled an unbiased drug screening platform and identification of physcion as a candidate therapeutic that can partially block DOXO-mediated cardiac toxicity.
2021-07-01 | GSE118086 | GEO