Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA189287 | ENA |
REPOSITORIES: ENA
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Project description:Certain mouse strains such as CBA, C3H and RFM, have high incidence of radiation-induced acute myeloid leukemia (AML). The data in this serie was generated by using spleen DNA from CBA mice which were irraidated with either gamma-rays or heavy ion (HZE) particles. Spleen DNA with radiation-induced AML was compared with DNA from normal CBA mice. Comparison of spleen DNA from CBA mice with radiation-induced AML vs genomic DNA from normal CBA mice
2012-10-05 | E-GEOD-37233 | biostudies-arrayexpress
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Project description:Transcriptional profiling of human lymphoblastoid TK6 cells comparing mock irradiated cells with cells exposed 24 hours previously to 1.67 Gy HZE (1 GeV/amu iron ions accelerated at the NASA Space Research Laboratory (NSRL) of Brookhaven National Laboratory) or 2.5 Gy 137Cs gamma rays.
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Project description:Gene expression analysis was carried out in human T-lymphoma Jurkat cells in order to identify candidate genes showing significant gene expression alterations allowing robust discrimination of the Auger emitter 123I, incorporated into the DNA as 123I-iododeoxyuridine (123IUdR), compared to α- and γ-radiation, which may be useful for biodosimetry purposes. Comparative gene expression analysis was performed employing whole human genome DNA microarrays. The gene expression of all candidate genes was validated by quantitative real-time PCR. 155, 316 and 982 genes were exclusively regulated after exposure to 123IUdR, α-particles and γ-rays, at equi-effect doses/activity, respectively. Applying the stringent requirements for candidate genes, four , one and one gene(s) were identified allowing a reliable discrimination between γ- versus 123IUdR exposure, γ- versus α-radiation and α- versus 123IUdR exposure, respectively. Gene expression analysis might be an effective tool for the general discrimination of radiation qualities and might help to elucidate different biological effectiveness on the mechanistic level.
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Project description:Plants exhibit a robust transcriptional response to gamma radiation which includes the induction of transcripts required for homologous recombination and the suppression of transcripts that promote cell cycle progression. Various DNA damaging agents induce different spectra of DNA damage as well as M-bM-^@M-^\collateralM-bM-^@M-^] damage to other cellular components and therefore are not expected to provoke identical responses by the cell. Here we study the effects of two different types of ionizing radiation (IR) treatment, HZE (1 GeV Fe26+ high mass, high charge, and high energy relativistic particles) and gamma photons, on the transcriptome of Arabidopsis thaliana seedlings. Both types of IR induce small clusters of radicals that can result in the formation of double strand breaks (DSBs), but HZE also produces linear arrays of extremely clustered damage. We performed these experiments across a range of time points (1.5-24 h after irradiation) in both wild-type plants and in mutants defective in the DSB-sensing protein kinase ATM. The two types of IR exhibit a shared double strand break-repair-related damage response, although they differ slightly in the timing, degree, and ATM-dependence of the response. The ATM-dependent, DNA metabolism-related transcripts of the M-bM-^@M-^\DSB responseM-bM-^@M-^] were also induced by other DNA damaging agents, but were not induced by conventional stresses. Both Gamma and HZE irradiation induced, at 24 h post-irradiation, ATM-dependent transcripts associated with a variety of conventional stresses; these were overrepresented for pathogen response, rather than DNA metabolism. In contrast, only HZE-irradiated plants, at 1.5 h after irradiation, exhibited an additional and very extensive transcriptional response, shared with plants experiencing M-bM-^@M-^\extended night.M-bM-^@M-^] This response was not apparent in gamma-irradiated plants. We treated 5-day-old WT and atm-1 seedlings of Arabidopsis thaliana with 100 Gy of Gamma radiation (over a span of 15 minutes) or 30 Gy of HZE (over a span of approximately 12 minutes). Gamma irradiations were completed at 8:40 am, while HZE irradiations were conducted in two runs (due to space limitations) which were completed at 1:09 and 1:28pm respectively. Gamma treated seedlings were sampled at 10:10 am, 11:40 am, 2:55 pm, 8:40 pm, and 8:40 am. HZE treated seedlings were sampled at 2:39 pm, 4:09 pm, 7:24 pm, 1:09 am, and 1:09 pm. Un-irradiated WT and atm-1 control seedlings were sampled at 10:45 am on Day #1 and 9:15 am on Day #2. There are a total of 22 experimental or control conditions, with two replicates per condition, yielding 44 samples overall.
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