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Oncohistone mutations occur at functional sites of regulatory ADP-ribosylation: the role of oncohistone mutations in transcriptional regulation

ABSTRACT: Oncohistone mutations occur at functional sites of regulatory ADP-ribosylation: the role of oncohistone mutations in transcriptional regulation

PROVIDER: PRJNA748361 | ENA |

REPOSITORIES: ENA

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Oncohistone mutations occur at functional sites of regulatory ADP-ribosylation: the role of oncohistone mutations in transcriptional regulation [ChIP-Seq]

Project description:Oncohistone mutations occur at functional sites of regulatory ADP-ribosylation: the role of oncohistone mutations in transcriptional regulation [ChIP-Seq]

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Genome-wide analysis of ADP-ribosylation by ADPr-ChAP reveals its association with chromatin after oxidative stress

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Project description:A key determinant of the pro-inflammatory responses in macrophages is the Signal Transducers and Activators of Transcription (STAT) family member, STAT1α. STAT1α activation by interferon-gamma (IFNγ) leads to induction of a transcriptional program that is coordinated in a large part by post-translational modifications such as phosphorylation. Poly(ADP-ribose) Polymerases (PARPs), which include PARP-1, catalyze the addition of ADP-ribose moieties (ADP-ribosylation) to target proteins and modulate their function. We found that PARP-1 mediates IFNγ-stimulated transcription by regulating genome-wide binding of STAT1α and its IFNγ-dependent phosphorylation. We identified STAT1α as a target of PARP-1 and found sites of ADP-ribosylation on its DNA-binding (DBD) and Transcription Activation (TA) domains. Surprisingly, ADP-ribosylation on the DBD and TA domains had distinct functional consequences on STAT1α transcriptional activity. Moreover, loss of ADP-ribosylation on either site led to diminished pro-inflammatory responses. These results suggest that PARP-1-driven ADP-ribosylation of STAT1α is a critical mediator of inflammation in macrophages.

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