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Global Inhibition with Specific Activation: How p53 and MYC Redistribute the Transcriptome in the DNA Double-Strand Break Response.

Molecular cell | Sep 21, 2017

In response to stresses, cells often halt normal cellular processes, yet stress-specific pathways must bypass such inhibition to generate effective responses. We investigated how cells redistribute global transcriptional activity in response to DNA damage. We show that an oscillatory increase of p53 levels in response to double-strand breaks drives a counter-oscillatory decrease of MYC levels. Using RNA sequencing (RNA-seq) of newly synthesized transcripts, we found that p53-mediated reduction of MYC suppressed general transcription, with the most highly expressed transcripts reduced to a greater extent. In contrast, upregulation of p53 targets was relatively unaffected by MYC suppression. Reducing MYC during the DNA damage response was important for cell-fate regulation, as counteracting MYC repression reduced cell-cycle arrest and elevated apoptosis. Our study shows that global inhibition with specific activation of transcriptional pathways is important for the proper response to DNA damage; this mechanism may be a general principle used in many stress responses.

Pubmed ID: 28867293 RIS Download

Mesh terms: Apoptosis | Binding Sites | Breast Neoplasms | CRISPR-Cas Systems | Cell Cycle Checkpoints | DNA Breaks, Double-Stranded | Female | Gene Expression Regulation, Neoplastic | HEK293 Cells | Humans | MCF-7 Cells | Promoter Regions, Genetic | Protein Binding | Proto-Oncogene Proteins c-myc | RNA Interference | RNA, Messenger | Schizosaccharomyces | Signal Transduction | Time Factors | Transcription, Genetic | Transcriptome | Transfection | Tumor Suppressor Protein p53

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