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Homo sapiens

ABSTRACT: Transcriptome of EBV-infected gastric cancer cell lines

PROVIDER: PRJNA259709 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1560840_1.fastq.gz	Fastqsanger.gz
	SRR1560840_2.fastq.gz	Fastqsanger.gz
	SRR1560841_1.fastq.gz	Fastqsanger.gz
	SRR1560841_2.fastq.gz	Fastqsanger.gz
	SRR1560842_1.fastq.gz	Fastqsanger.gz

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Transcriptome of EBV-infected gastric cancer cell lines

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Project description:Aberrant promoter methylation is known to be deeply involved in human gastric carcinogenesis, while association of Epstein-Barr virus (EBV) to the aberrant methylation has not been fully clarified. We analyzed promoter methylation in clinical gastric cancer cases using illumina's Infinium beadarray, and hierarchical clustering analysis classified gastric cancer into three subgroups: low and high methylation epigenotypes in EBV-negative cases, and markedly higher methylation epigenotype that was completely matched to EBV-positive cases. Three epigenotypes were characterized by three groups of genes: genes methylated specifically in the EBV-positive epigenotype (EBV(+)-markers, e.g. CXXC4, TIMP2, PLXND1), genes methylated both in EBV-positive and high epigenotypes (High-markers, e.g. COL9A2, EYA1, ZNF365), and genes methylated all in EBV-positive, high and low epigenotypes of gastric cancer (Common-markers, e.g. AMPH, SORCS3, AJAP1). Polycomb repressive complex (PRC)-target genes in ES cells were significantly enriched in High- and Common-markers (P=2x10-15 and 2x10-34, respectively), but not in EBV(+)-markers (P=0.2), suggesting a different cause for EBV(+)-marker methylation. Recombinant EBV was infected to low epigenotype gastric cancer cell, MKN7. In all the three independently established clones, DNA methylation was induced in High- and EBV(+)-markers after 18 weeks, demonstrating that EBV-positive epigenotype should involve methylation of Common-, High-, and EBV(+)-markers simultaneously. The de novo methylated genes were overlapped well among the three clones, and the methylation caused gene repression. In summary, gastric cancer was classified into three DNA methylation epigenotypes, EBV-positive gastric cancer showed markedly high methylation epigenotype expanding to non-PRC target genes, and EBV infection per se could induce the EBV-positive epigenotype.

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