Analysis of ctDNA methylation induced by ionizing to different ograns
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ABSTRACT:
PROVIDER: PRJNA687485 | ENA |
REPOSITORIES: ENA
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Project description:This study aims to compared ctDNA methylation status induced by ionizing to different ograns. SD rats were irradiated with local radaition to brain, lung or skin. Serum was collected and subjiected to ctDNA extraction. ctDNA were then treated by methylation-sensive bisulfite and sequencing.
2021-12-23 | GSE163763 | GEO
Project description:To develop diagnostic and prognostic biomarkers, we compared methylation profiles of HCC tissues and normal blood by analyzing 485,000 CpG markers and identified a HCC enriched methylation marker panel compared to that of normal blood. We found there was a highly correlation of methylation profiles between DNA from HCC cancer tissue and matched plasma ctDNA within the same patient. We then selected 10 markers from this panel and created a combined diagnosis score (cd-score) which showed high diagnostic specificity and sensitivity in both a training cohort and an independent validation cohort. We also showed the cd-score correlate highly with tumor load, treatment response and stage and is superior to that by AFP. We also showed the cd-score correlate highly with tumor load, treatment response and stage and is superior to that by AFP. Additional, we generated 8 markers from unicox and LASSO-cox analysis and created a combined prognosis score (cp-score) which could predict prognosis and survival. Together, these findings demonstrated the utility of ctDNA methylation markers in the diagnosis, treatment evaluation and prognosis of HCC.
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Project description:This is a prospective, multicenter, observational, single-blinded controlled study. Dynamic monitoring of patients with resectable colorectal cancer was performed using the previously established colorectal tumor-specific plasma ctDNA methylation markers (Multigene methylation detection). Dynamic monitoring of plasma ctDNA methylation before and after treatment and at regular follow-up in patients with colorectal cancer after radical resection of tumor, to explore the predictive effect of postoperative plasma ctDNA methylation on postoperative recurrence and whether dynamic monitoring of postoperative ctDNA methylation could be earlier than imaging examination to indicate tumor recurrence.
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Project description:To investigate DNA methylation patterns in rat mammary carcinomas induced by ionizing radiation.
2018-02-14 | GSE96565 | GEO
Project description:Ionizing radiation is known to cause DNA damage, yet the mechanisms underlying potential transgenerational effects of exposure have been scarcely studied. Previously, we observed effects in offspring of zebrafish exposed to gamma radiation during gametogenesis. Here, we hypothesize that these effects are accompanied by changes of DNA methylation possibly inherited by subsequent generations. We assessed DNA methylation in F1 embryos (5.5 hours post fertilization) with whole genome bisulfite sequencing following parental exposure to 8.7 mGy/h for 27 days and found 5658 differentially methylated regions (DMRs). DMRs were predominantly located at known regulatory regions, such as gene promoters and enhancers. Pathway analysis indicated the involvement of DMRs related to similar pathways found with gene expression analysis, such as development, apoptosis and cancers, which could be linked to previous observed developmental defects and genomic instability in the offspring. Follow up of 19 F1 DMRs in F2 and F3 embryos revealed persistent effects up to the F3 generation at 5 regions. These results indicate that ionizing radiation related effects in offspring can be linked to DNA methylation changes that partly can persist over generations. Monitoring DNA methylation could serve as a biomarker to provide an indication of ancestral exposures to ionizing radiation.
2017-12-08 | GSE100470 | GEO
Project description:This is a multicenter, clinical study. This study is to evaluate the sensitivity of plasma ctDNA methylation haplotypes in detecting colorectal cancer, adenoma and the specificity in healthy individuals.
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Project description:This is a prospective, clinical study. This study is to evaluate the sensitivity of plasma ctDNA methylation haplotypes in detecting local residual or lymph node metastasis.
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Project description:Both exposure to ionizing radiation and obesity have been associated with various pathologies including cancer. There is a crucial need in better understanding the interactions between ionizing radiation effects (especially at low doses) and other risk factors, such as obesity. In order to evaluate radiation responses in obese animals, C3H and C57BL/6 mice fed a control low fat or a high fat (HF) diet were exposed to fractionated doses of X-rays (4×0.75 Gy). Bone marrow micronucleus assays did not suggest a modulation of radiation-induced genotoxicity by HF diet. Both HF diet and irradiation resulted in increased oxidative damage, H2AX levels and proliferation in C57BL/6 mouse liver. Using methylation-specific PCR, we observed that the promoters of p16 and Dapk genes were methylated in the livers of C57BL/6 mice fed a HF diet (irradiated and non-irradiated); Mgmt promoter was methylated in irradiated and/or HF diet-fed mice. In addition, methylation PCR arrays identified Ep300 and Socs1 (whose promoters exhibited higher methylation levels in non-irradiated HF diet-fed mice) as potential targets for further studies. We then compared microRNA regulations after radiation exposure in the livers of C57BL/6 mice fed a normal or an HF diet, using microRNA arrays. Interestingly, radiation-triggered microRNA regulations observed in normal mice were not observed in obese mice. All together, our results suggested the existence of dietary effects on radiation responses (especially epigenetic regulations) in mice, possibly in relationship with obesity-induced chronic oxidative stress. C57BL/6J mice were fed a normal or a high-fat diet and exposed to 4 x 0.75 Gy X-rays. miRNA expression was measured in the livers of 3 mice for each experimental group.
2013-11-09 | E-GEOD-47956 | biostudies-arrayexpress
Project description:Ionizing Radiation-induced Acute Damage in the Salivary Gland
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