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NET-CAGE Characterizes the Dynamics and Topology of Human Transcribed Cis-regulatory Elements

ABSTRACT: NET-CAGE Characterizes the Dynamics and Topology of Human Transcribed Cis-regulatory Elements

PROVIDER: PRJNA484341 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7641190.fastq.gz	Fastqsanger.gz
	SRR7641200.fastq.gz	Fastqsanger.gz
	SRR7641210.fastq.gz	Fastqsanger.gz
	SRR7641220.fastq.gz	Fastqsanger.gz
	SRR7641230.fastq.gz	Fastqsanger.gz

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NET-CAGE Characterizes the Dynamics and Topology of Human Transcribed Cis-regulatory Elements

Project description:Promoters and enhancers are key cis-regulatory elements, but how they operate to generate cell-type-specific transcriptomes is not fully understood. We developed a simple and robust approach to sensitively detect 5’-ends of nascent RNAs (NET-CAGE) in diverse cells and tissues, including unstable transcripts such as enhancer-derived RNAs. We studied RNA synthesis and degradation at the transcription start site (TSS) level, characterizing the impact of differential promoter usage on transcript stability. We quantified transcription from cis-regulatory elements without the influence of RNA turnover, and show that enhancer-promoter pairs are generally activated simultaneously upon stimulation. By integrating NET-CAGE data with chromatin interaction maps, we show that cis-regulatory elements are topologically connected according to their cell-type specificity. We identified new enhancers with high sensitivity, and delineated primary locations of transcription within super-enhancers. Our NET-CAGE dataset derived from human and mouse cells expands the FANTOM5 catalogue of transcribed enhancers, with broad applicability to biomedical research.

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Project description:The mammalian sex-determining gene Sry induces male development. Through analyzing transcriptome of pre-Sertoli cells, we identified a novel sequence transcribed within palindromic sequence surrounding Sry. To examine whether this sequence contains transcription start site, Cap analysis gene expression (CAGE) -seq analysis was performed, in which putative transcriptional start sites can be identified by sequencing the 3’ end of cDNA corresponding to 5’ end of RNA. CAGE seq revealed that Cap site was absent within the novel sequence, whereas Sry transcription start site found to locate in minus strand at chrY:2,663,800-2,663,900. Combining the result from long-read RNA seq, we concluded that this sequence is the second exon of mouse Sry.

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Project description:We developed SLIC-CAGE (Super-Low Input Carrier-CAGE) approach to capture 5'end of RNA polymerase II transcripts from as little as 5-10 ng of total RNA. The dramatic increase in sensitivity compared to existing CAGE methods is achieved by specially designed, selectively degradable carrier RNA. We tested SLIC-CAGE on Saccharomyces cerevisiae (BY4741 strain) and produced libraries from 1-100 ng of total cellular RNA. We also produced S. cerevisiae nAnT-iCAGE libraries as the current gold-standard CAGE libraries using the recommended 5 micrograms of total cellular RNA to assess the quality of SLIC-CAGE libraries produces with up to 1000-fold less material. We provide a direct comparison between SLIC-CAGE and the latest nanoCAGE protocol (libraries created using S. cerevisiae total RNA) and show that SLIC-CAGE produces unbiased libraries of higher complexity and quality than nanoCAGE. Finally, we provide SLIC-CAGE libraries on mouse embryonic stem cells (E14) using 5-100 ng of total cellular RNA as starting material.

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