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SLAM-seq defines direct gene-regulatory functions of the BRD4-MYC axis [ChIP-Seq]

ABSTRACT: Defining direct targets of transcription factors and regulatory pathways is key to understanding their role in physiology and disease. Here we combine SLAM-seq, a novel method for direct quantification of newly synthesized mRNAs, with pharmacological and rapid chemical-genetic perturbation to interrogate primary transcriptional targets of BRD4 and MYC and define the response to BET bromodomain inhibitors (BETi). While BRD4 acts as a global co-activator of Pol2-dependent transcription in a BET bromodomain-dependent manner, therapeutic BETi doses deregulate a small set of hypersensitive target genes. In contrast to BRD4, MYC primarily acts as a selective transcriptional activator that controls basic metabolic processes such as ribosome biogenesis and de-novo purine synthesis across diverse cancer contexts. Beyond defining primary regulatory functions of BRD4 and MYC in cancer, our study establishes a simple, robust and scalable approach to dissect direct transcriptional targets of any gene or pathway.

ORGANISM(S): Homo sapiens

PROVIDER: GSE111460 | GEO | 2018/04/05

REPOSITORIES: GEO

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SLAM-seq defines direct gene-regulatory functions of the BRD4-MYC axis [SLAM-seq]

Project description:Defining direct targets of transcription factors and regulatory pathways is key to understanding their role in physiology and disease. Here we combine SLAM-seq, a novel method for direct quantification of newly synthesized mRNAs, with pharmacological and rapid chemical-genetic perturbation to interrogate primary transcriptional targets of BRD4 and MYC and define the response to BET bromodomain inhibitors (BETi). While BRD4 acts as a global co-activator of Pol2-dependent transcription in a BET bromodomain-dependent manner, therapeutic BETi doses deregulate a small set of hypersensitive target genes. In contrast to BRD4, MYC primarily acts as a selective transcriptional activator that controls basic metabolic processes such as ribosome biogenesis and de-novo purine synthesis across diverse cancer contexts. Beyond defining primary regulatory functions of BRD4 and MYC in cancer, our study establishes a simple, robust and scalable approach to dissect direct transcriptional targets of any gene or pathway.

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