Single-cell nascent RNA sequencing using click-chemistry unveils coordinated transcription
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ABSTRACT:
PROVIDER: PRJNA1011911 | ENA |
REPOSITORIES: ENA
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Project description:Transcription is the primary regulatory step in gene expression coordinating the coding and non-coding genomic regions across space and time. Divergent initiation of transcription from promoters and enhancers produces stable RNAs from genes and unstable RNAs from enhancers. Nascent RNA capture and sequencing assays simultaneously measure gene and enhancer activity from cell populations. However, the lack of single-cell resolved view of active transcription has left fundamental questions in gene regulation unanswered. In this study, we present scGRO-seq - a single-cell nascent RNA sequencing assay using copper-catalyzed azide-alkyne cycloaddition - unveiling the coordinated regulation of dynamic transcription throughout the genome. scGRO-seq demonstrates the episodic nature of transcription and provides estimates of burst size and frequency by directly quantifying transcribing RNA polymerases. It reveals the co-transcription of functionally related genes and leverages the transcription of replication-dependent non-polyadenylated histone genes to elucidate cell-cycle dynamics. The single-nucleotide spatiotemporal resolution of scGRO-seq characterizes networks of enhancers and genes and indicates the bursting of transcription at super-enhancers before the activation of burst from associated genes. Our method offers insights into the dynamic nature of transcription, functional architecture of the genome, and serves as a powerful tool to investigate the role of the non-coding genome in gene regulation.
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Project description:The success of targeted therapies hinges on our ability to understand the molecular and cellular mechanism of action of these agents. Here we modify various BET bromodomain inhibitors, an exemplar novel targeted therapy, to create functionally conserved compounds that are amenable to click-chemistry and can be used as molecular probes in vitro and in vivo. Using click-proteomics and click-sequencing we provide new mechanistic insights to explain the gene regulatory function of BRD4 and the transcriptional changes invoked by BET inhibitors. In mouse models of acute leukaemia, we use high resolution microscopy and flow cytometry to highlight the underappreciated heterogeneity of drug activity within tumour cells located in different tissue compartments. We also demonstrate the differential distribution and effects of the drug in normal and malignant cells in vivo. These data provide critical insights that reveal the cellular and molecular details for the efficacy and limitations of these agents. This study provides a framework for the pre-clinical assessment of other conventional and targeted therapies.
2017-07-13 | GSE88749 | GEO
Project description:The success of targeted therapies hinges on our ability to understand the molecular and cellular mechanism of action of these agents. Here we modify various BET bromodomain inhibitors, an exemplar novel targeted therapy, to create functionally conserved compounds that are amenable to click-chemistry and can be used as molecular probes in vitro and in vivo. Using click-proteomics and click-sequencing we provide new mechanistic insights to explain the gene regulatory function of BRD4 and the transcriptional changes invoked by BET inhibitors. In mouse models of acute leukaemia, we use high resolution microscopy and flow cytometry to highlight the underappreciated heterogeneity of drug activity within tumour cells located in different tissue compartments. We also demonstrate the differential distribution and effects of the drug in normal and malignant cells in vivo. These data provide critical insights that reveal the cellular and molecular details for the efficacy and limitations of these agents. This study provides a framework for the pre-clinical assessment of other conventional and targeted therapies.
2017-07-13 | GSE88748 | GEO
Project description:The success of targeted therapies hinges on our ability to understand the molecular and cellular mechanism of action of these agents. Here we modify various BET bromodomain inhibitors, an exemplar novel targeted therapy, to create functionally conserved compounds that are amenable to click-chemistry and can be used as molecular probes in vitro and in vivo. Using click-proteomics and click-sequencing we provide new mechanistic insights to explain the gene regulatory function of BRD4 and the transcriptional changes invoked by BET inhibitors. In mouse models of acute leukaemia, we use high resolution microscopy and flow cytometry to highlight the underappreciated heterogeneity of drug activity within tumour cells located in different tissue compartments. We also demonstrate the differential distribution and effects of the drug in normal and malignant cells in vivo. These data provide critical insights that reveal the cellular and molecular details for the efficacy and limitations of these agents. This study provides a framework for the pre-clinical assessment of other conventional and targeted therapies.
2017-07-13 | GSE88750 | GEO
Project description:The success of targeted therapies hinges on our ability to understand the molecular and cellular mechanism of action of these agents. Here we modify various BET bromodomain inhibitors, an exemplar novel targeted therapy, to create functionally conserved compounds that are amenable to click-chemistry and can be used as molecular probes in vitro and in vivo. Using click-proteomics and click-sequencing we provide new mechanistic insights to explain the gene regulatory function of BRD4 and the transcriptional changes invoked by BET inhibitors. In mouse models of acute leukaemia, we use high resolution microscopy and flow cytometry to highlight the underappreciated heterogeneity of drug activity within tumour cells located in different tissue compartments. We also demonstrate the differential distribution and effects of the drug in normal and malignant cells in vivo. These data provide critical insights that reveal the cellular and molecular details for the efficacy and limitations of these agents. This study provides a framework for the pre-clinical assessment of other conventional and targeted therapies.
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Project description:The success of targeted therapies hinges on our ability to understand the molecular and cellular mechanism of action of these agents. Here we modify various BET bromodomain inhibitors, an exemplar novel targeted therapy, to create functionally conserved compounds that are amenable to click-chemistry and can be used as molecular probes in vitro and in vivo. Using click-proteomics and click-sequencing we provide new mechanistic insights to explain the gene regulatory function of BRD4 and the transcriptional changes invoked by BET inhibitors. In mouse models of acute leukaemia, we use high resolution microscopy and flow cytometry to highlight the underappreciated heterogeneity of drug activity within tumour cells located in different tissue compartments. We also demonstrate the differential distribution and effects of the drug in normal and malignant cells in vivo. These data provide critical insights that reveal the cellular and molecular details for the efficacy and limitations of these agents. This study provides a framework for the pre-clinical assessment of other conventional and targeted therapies.
2017-07-13 | GSE88747 | GEO
Project description:Click chemistry enables comprehensive preclinical evaluation of targeted epigenetic therapies
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Project description:DNA alterations are drivers of aging, neurodegeneration, carcinogenesis, and chemotherapy drug action. To understand the functional genomic roles of DNA modifications, it is critical to accurately map their diverse chemical forms with single-nucleotide precision in complex genomes, which however remains challenging. Click-code-seq is the click-chemistry-aided single-nucleotide-resolution method introduced to map oxidation in yeast DNA. Here, we upgraded click-code-seq to enable its first application for sequencing DNA oxidation and depurination in the human genome. For this, we developed a companion fluorescence tagging assay, click-fluoro-quant, to rapidly quantify common modifications. Moreover, we devised novel adapters to minimize false modification detection and assess modification frequency in cell populations. We uncovered that endogenous DNA oxidation in a human cell line has a highly similar pattern to the cancer mutational signatures associated with the effects of reactive oxygen species. We established that the chemotherapy drug irofulven preferentially depurinates ApA dimers and promoter regions. Intriguingly, we revealed that oxidized guanines and apurinic sites, both irofulven-induced and endogenous, are depleted in the transcribed strand of genes, and the strand bias widens with increasing gene expressions. This work advances click-code-seq for deciphering the impacts of key DNA modifications in the human genome on cellular physiology and toxicological responses.
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