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Next Generation Sequencing assesses E2F7-regulated gene expression profiling

ABSTRACT: Next Generation Sequencing assesses E2F7-regulated gene expression profiling

PROVIDER: PRJNA419342 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6312630.fastq.gz	Fastqsanger.gz
	SRR6312625.fastq.gz	Fastqsanger.gz
	SRR6312626.fastq.gz	Fastqsanger.gz
	SRR6312627.fastq.gz	Fastqsanger.gz
	SRR6312628.fastq.gz	Fastqsanger.gz

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Project description:Oncogene-induced senescence is an anti-proliferative stress response program that acts as a fail-safe mechanism to limit oncogenic transformation and is regulated by the retinoblastoma protein (RB) and p53 tumor suppressor pathways. We identify the atypical E2F family member E2F7 as the only E2F transcription factor potently upregulated during oncogene-induced senescence, a setting where it acts in response to p53 as a direct transcriptional target. Once induced, E2F7 binds and represses a series of E2F target genes and cooperates with RB to efficiently promote cell cycle arrest and limit oncogenic transformation. Disruption of RB triggers a further increase in E2F7, which induces a second cell cycle checkpoint that prevents unconstrained cell division despite aberrant DNA replication. Mechanistically, E2F7 compensates for the loss of RB in repressing mitotic E2F target genes.

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BW001: E2F7 represses a network of oscillating cell cycle genes to control S-phase progression

Project description:E2F transcription factors are known to be important for timely activation of G1/S and G2/M genes required for cell cycle progression, but transcriptional mechanisms for deactivation of cell cycle-regulated genes are unknown. Here, we show that E2F7 is highly expressed during mid to late S-phase, occupies promoters of G1/S-regulated genes and represses their transcription. ChIP-seq analysis revealed that E2F7 binds preferentially to genomic sites containing the TTCCCGCC motif, which closely resemble the E2F consensus site. We identified 89 target genes that carry E2F7 binding sites close to the transcriptional start site and that are directly repressed by short term induction of E2F7. Most of these target genes are known to be activated by E2Fs and are involved in DNA replication, metabolism and DNA repair. Importantly, induction of E2F7 during G0-G1/S resulted in S-phase arrest and DNA damage, whereas expression of E2F7 during G2/M failed to disturb cell cycle progression. These findings provide strong evidence that E2F7 directly controls the downswing of oscillating G1/S genes during S-phase progression.

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