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Chromatin opening by p53 is confined by Trim24 in a histone methylation-dependent manner [ATAC-seq]

ABSTRACT: Chromatin modifications are thought to provide additional context dependence for sequence-based gene activation. Binding sites of the transcription factor (TF) and important tumor suppressor p53 are unusually diverse with regards to their chromatin accessibility and histone modifications, suggesting different modes of binding. Here, we show that the ability of p53 to open chromatin and activate its target genes upon DNA damage is locally restricted by its cofactor Trim24. The histone-binding domains of Trim24 limit the role of p53 at closed chromatin but not at accessible chromatin where Trim24 is blocked by histone 3 methylation at lysine 4. In turn p53 regulates gene expression as a function of the naïve chromatin state prior to activation. These findings establish a set of p53 response genes in closed chromatin that are Trim24-regulated and illustrate how histone modification sensing cofactors bridge local chromatin state and TF potency.

ORGANISM(S): Mus musculus

PROVIDER: GSE200582 | GEO | 2023/04/30

REPOSITORIES: GEO

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Chromatin opening by p53 is confined by Trim24 in a histone methylation-dependent manner [RNA-seq]

Project description:Chromatin modifications are thought to provide additional context dependence for sequence-based gene activation. Binding sites of the transcription factor (TF) and important tumor suppressor p53 are unusually diverse with regards to their chromatin accessibility and histone modifications, suggesting different modes of binding. Here, we show that the ability of p53 to open chromatin and activate its target genes upon DNA damage is locally restricted by its cofactor Trim24. The histone-binding domains of Trim24 limit the role of p53 at closed chromatin but not at accessible chromatin where Trim24 is blocked by histone 3 methylation at lysine 4. In turn p53 regulates gene expression as a function of the naïve chromatin state prior to activation. These findings establish a set of p53 response genes in closed chromatin that are Trim24-regulated and illustrate how histone modification sensing cofactors bridge local chromatin state and TF potency.

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