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EccDNA dataset from diploid Saccharomyces cerevisiae S288C BY

ABSTRACT: EccDNA preparation from biological B02-B05 samples. Each sample from 1x10^6 cells.

PROVIDER: PRJEB11638 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	ERR1193622_1.fastq.gz	Fastqsanger.gz
	ERR1193622_2.fastq.gz	Fastqsanger.gz
	ERR1193623_1.fastq.gz	Fastqsanger.gz
	ERR1193623_2.fastq.gz	Fastqsanger.gz
	ERR1193624_1.fastq.gz	Fastqsanger.gz

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eccDNA in maternal plasma

Project description:We developed a new bioinformatics method for detecting the eccDNA in plasma. We revealed that the biological properties between eccDNA and linear DNA are different. eccDNA could be potentially provided as a new class of circulating biomarker.

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Extrachromosomal circular SUZ12 amplicon dictates retinoblastoma progression through reprogramming H3K27 methylation [eccDNA-seq]

Project description:Extrachromosomal circular DNA (eccDNA) is double-stranded circular DNA that is derived from but independent of chromosomal DNA. Owing to its nonchromosomal inheritance, eccDNA facilitates the amplification of oncogenes and expedites the process of genome evolution in tumor. However, the role of eccDNA in RB remains enigmatic. We combined Circle-Seq and RNA-Seq to identified crucial extrachromosomal circular oncogene amplicons. Herein, we revealed that extrachromosomal circular SUZ12 amplicon regulates H3K27me3 modification during the oncogenic progression of retinoblastoma. Conclusively, our study initially delineated an integrated picture of the eccDNA landscape in retinoblastoma and unveiled a novel SUZ12-containing eccDNA/H3K27me3 oncogenic mechanism where eccDNA dictates retinoblastoma progression through regulating transcription levels of linear DNA.

2023-07-02 | GSE235888 | GEO

Whole-genome sequencing of Extrachromosomal circular DNA (eccDNA) of cerebrospinal fluid of Medulloblastoma

Project description:Background: Medulloblastoma (MB) is one of the malignant tumors of the central nervous system (CNS) with a poor prognosis and lack of effective detection. Extrachromosomal circular DNA (eccDNA) has been reported to be closely related to CNS tumors. However, there is still a gap in eccDNA of MB.Methods: Genomic features of eccDNAs were identified in MB tissues and matched cerebrospinal fluid (CSF) using a circle-map, compared with normal. The nucleotides on both sides of the eccDNAs breakpoint were analyzed to investigate the mechanisms of eccDNAs formation. Bioinformatics analysis combined with the GEO database identified reliable features of eccDNA-related genes in MB. Lasso Cox regression model, univariate and multivariate Cox regression analysis, time-dependent ROC, and Kaplan–Meier curve were used to assess the potential diagnostic and prognostic value of the Hub genes.Results: 35179 eccDNAs were identified, with the majority less than 1000 base pairs (bp). The distribution of eccDNAs on the genome was closely related to gene density. EccDNAs in CSF exhibited phase parallelism with matched MB tissues and were shown differently in tumors and normal. Ten core genes were identified in combination with GEO and showed reliable diagnostic and prognostic value in independent datasets through univariate and multivariate Cox regression. Nomogram included Hub-gene signatures was established and showed clinical benefit.Conclusions: This study described the characteristics and formation mechanism of eccDNAs in MB and CSF. The role of eccDNA in MB was revealed, and eccDNA-associated hub genes in CSF could be used as diagnostic and prognostic biomarkers for MB.

2022-10-20 | GSE205178 | GEO

Circle-seq reveals that eccDNA may be a key blood biomarker for HBV-associated liver cancer (4)

Project description:To explore the expression of eccDNA in patients with liver cirrhosis and liver cancer, focusing on their impact on disease development.

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Circle-seq reveals that eccDNA may be a key blood biomarker for HBV-associated liver cancer (2)

Project description:To explore the expression of eccDNA in patients with chronic hepatitis B and liver cirrhosis, focusing on their impact on disease development.

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eccDNA in Arabidopsis

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Circle-seq revealing eccDNA profiling of human bone marrow mesenchymal stem cells

Project description:Extrachromosomal circular DNAs (eccDNAs) have been discovered in various species and play a significant role in cancer development However, our understanding of eccDNAs in normal cells is limited. Here, we conducted eccDNA sequencing by Circle-seq in undifferentiated human bone marrow mesenchymal stem cells (uhBMSCs) and their differentiation into osteoblasts (OBs), chondrocytes (CCs), and adipocytes (ACs) to gain knowledge about eccDNAs in cell differentiation,

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eccDNA biogenesis and its role in innate immunity

Project description:Extrachromosomal circular DNA elements (EccDNAs) have been described in the literature for several decades and are known for their wide existence across species as well as their high heterogeneity in genomic origins. Due to their scarcity and lack of validation tools, their biogenesis as well as their functions are largely unknown. Here, by using a newly developed circular DNA enrichment method, we purified eccDNAs from different cells and mapped their genomic location using both Illumine and Nanopore sequencing. We found that eccDNAs are mapped to genome in a largely random fashion, suggesting a biogenesis mechanism of random ligation of genomic DNA fragments. Consistently, we found that apoptosis inducers can increase the eccDNA generation, which is dependent on DNase 1/3 and DNA ligase 3. Importantly, we demonstrate that eccDNAs function as potent innate immunostimulants in a sequence-independent, but circularization-dependent fashion.

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