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NicE-C efficiently reveals open chromatin-associated chromosome interactions at high resolution.

ABSTRACT: Enhancer-promoter communication is known to regulate spatiotemporal dynamics of gene expression. Several methods are available to capture enhancer-promoter interactions, but they either require large amounts of starting materials and are costly, or provide a relative low resolution in chromatin contact maps. Here, we present nicking enzyme-assisted open chromatin interaction capture (NicE-C), a method that leverages nicking enzyme-mediated open chromatin profiling and chromosome conformation capture to enable robust and cost-effective detection of open chromatin interactions at high resolution, especially enhancer-promoter interactions. Using TNF stimulation and mouse kidney aging as models, we applied NicE-C to reveal characteristics of dynamic enhancer-promoter interactions.

SUBMITTER: Luo Z

PROVIDER: S-EPMC8896462 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature

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NicE-C efficiently reveals open chromatin-associated chromosome interactions at high resolution.

Luo Zhengyu Z Zhang Ran R Hu Tengfei T Zhu Yuting Y Wu Yueming Y Li Wenfei W Zhang Zhi Z Yao Xuebiao X Liang Haiyi H Song Xiaoyuan X

Genome research 20220201 3

Enhancer-promoter communication is known to regulate spatiotemporal dynamics of gene expression. Several methods are available to capture enhancer-promoter interactions, but they either require large amounts of starting materials and are costly, or provide a relative low resolution in chromatin contact maps. Here, we present nicking enzyme-assisted open chromatin interaction capture (NicE-C), a method that leverages nicking enzyme-mediated open chromatin profiling and chromosome conformation cap ...[more]

PMID: 35105668

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NicE-C efficiently reveals open chromatin associated chromosome interactions at high resolution

Project description:Enhancer-promoter communication is known to regulate spatiotemporal gene expression. Here, we present NicE-C, a method that leverages nicking enzyme mediated open chromatin profiling and chromosome conformation capture to enable robust and cost-effective detection of chromatin interactions among open chromatin regions (e.g., between enhancers and promoters). Demonstrating its application utility, NicE-C revealed dynamic enhancer-promoter interactions associated with gene expression changes after TNFɑ stimulation in HeLa cells and during aging process in mice kidney.

2022-01-18 | GSE176066 | GEO

NicE-C efficiently reveals open chromatin associated chromosome interactions at high resolution

Project description:NicE-C efficiently reveals open chromatin associated chromosome interactions at high resolution

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NicE-seq: high resolution open chromatin profiling.

Project description:Open chromatin profiling integrates information across diverse regulatory elements to reveal the transcriptionally active genome. Tn5 transposase and DNase I sequencing-based methods prefer native or high cell numbers. Here, we describe NicE-seq (nicking enzyme assisted sequencing) for high-resolution open chromatin profiling on both native and formaldehyde-fixed cells. NicE-seq captures and reveals open chromatin sites (OCSs) and transcription factor occupancy at single nucleotide resolution, coincident with DNase hypersensitive and ATAC-seq sites at a low sequencing burden. OCSs correlate with RNA polymerase II occupancy and active chromatin marks, while displaying a contrasting pattern to CpG methylation. Decitabine-mediated hypomethylation of HCT116 displays higher numbers of OCSs.

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NicE-seq: high resolution open chromatin profiling

Project description:Mammalian chromatin is dynamic and contains structural information that leads to transcriptional regulation of genes by recruiting transcription factors and altering nucleosome positioning. Here, we describe open chromatin mapping using Nicking Enzyme assisted sequencing (NicE-seq) for integrative epigenomic analysis. NicE-seq captures open chromatin sites in both fixed and native cells and reveals the genomic location of open chromatin sites (OCS) and transcription factor occupancy at single nucleotide resolution, with as few as 250 HCT116 cells. In HCT116 cells a large percentage of the OCS were coincident with DHS (DNaseI hypersensitive site) and ATAC-seq sites. OCSs correlated well with RNA pol II occupancy and transcriptionally active chromatin marks, while displaying a pattern contrasting to CpG methylation. ChIP CTCF peaks common to OCS and DHS displayed a strong correlation with H3K4me3 and H3K27ac marks. Further peaks unique to OCS and ChIP CTCF peaks also correlated strongly with H3K4me3, H3K27ac and higher transcription. Similar results were also obtained for Max and Sp1 transcription factors. Using NicE-seq we have demonstrated that HCT116 cells, treated with anti cancer drug decitabine, displayed time dependent accumulation of OCS coinciding with hypomethylation of the genome, particularly in SINE and satellite repetitive DNA. Differentially methylated regions (DMRs) were more pronounced in promoters, 5’UTR, CpG islands and exons. In summary, sequence specificity offered by a nicking enzyme allows a means to study open chromatin structure and hypomethylation of genomes, revealing the open chromatin landscape in cellular context.

2017-05-24 | GSE97889 | GEO

High-resolution genetic mapping of putative causal interactions between regions of open chromatin.

Project description:Physical interaction of regulatory elements in three-dimensional space poses a challenge for studies of disease because non-coding risk variants may be great distances from the genes they regulate. Experimental methods to capture these interactions, such as chromosome conformation capture, usually cannot assign causal direction of effect between regulatory elements, an important component of fine-mapping studies. We developed a Bayesian hierarchical approach that uses two-stage least squares and applied it to an ATAC-seq (assay for transposase-accessible chromatin using sequencing) data set from 100 individuals, to identify over 15,000 high-confidence causal interactions. Most (60%) interactions occurred over <20 kb, where chromosome conformation capture-based methods perform poorly. For a fraction of loci, we identified a single variant that alters accessibility across multiple regions, and experimentally validated the BLK locus, which is associated with multiple autoimmune diseases, using CRISPR genome editing. Our study highlights how association genetics of chromatin state is a powerful approach for identifying interactions between regulatory elements.

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Universal NicE-seq for high-resolution accessible chromatin profiling for formaldehyde-fixed and FFPE tissues.

Project description:Accessible chromatin plays a central role in gene expression and chromatin architecture. Current accessible chromatin approaches depend on limited digestion/cutting and pasting adaptors at the accessible DNA, thus requiring additional materials and time for optimization. Universal NicE-seq (UniNicE-seq) is an improved accessible chromatin profiling method that negates the optimization step and is suited to a variety of mammalian cells and tissues. Addition of 5-methyldeoxycytidine triphosphate during accessible chromatin labeling and an on-bead library making step substantially improved the signal to noise ratio while protecting the accessible regions from repeated nicking in cell lines, mouse T cells, mouse kidney, and human frozen tissue sections. We also demonstrate one tube UniNicE-seq for the FFPE tissue section for direct NGS library preparation without sonication and DNA purification steps. These refinements allowed reliable mapping of accessible chromatin for high-resolution genomic feature studies.

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High-resolution mapping of open chromatin in the rice genome.

Project description:Gene expression is controlled by the complex interaction of transcription factors binding to promoters and other regulatory DNA elements. One common characteristic of the genomic regions associated with regulatory proteins is a pronounced sensitivity to DNase I digestion. We generated genome-wide high-resolution maps of DNase I hypersensitive (DH) sites from both seedling and callus tissues of rice (Oryza sativa). Approximately 25% of the DH sites from both tissues were found in putative promoters, indicating that the vast majority of the gene regulatory elements in rice are not located in promoter regions. We found 58% more DH sites in the callus than in the seedling. For DH sites detected in both the seedling and callus, 31% displayed significantly different levels of DNase I sensitivity within the two tissues. Genes that are differentially expressed in the seedling and callus were frequently associated with DH sites in both tissues. The DNA sequences contained within the DH sites were hypomethylated, consistent with what is known about active gene regulatory elements. Interestingly, tissue-specific DH sites located in the promoters showed a higher level of DNA methylation than the average DNA methylation level of all the DH sites located in the promoters. A distinct elevation of H3K27me3 was associated with intergenic DH sites. These results suggest that epigenetic modifications play a role in the dynamic changes of the numbers and DNase I sensitivity of DH sites during development.

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High-resolution mapping and characterization of open chromatin across the genome.

Project description:Mapping DNase I hypersensitive (HS) sites is an accurate method of identifying the location of genetic regulatory elements, including promoters, enhancers, silencers, insulators, and locus control regions. We employed high-throughput sequencing and whole-genome tiled array strategies to identify DNase I HS sites within human primary CD4+ T cells. Combining these two technologies, we have created a comprehensive and accurate genome-wide open chromatin map. Surprisingly, only 16%-21% of the identified 94,925 DNase I HS sites are found in promoters or first exons of known genes, but nearly half of the most open sites are in these regions. In conjunction with expression, motif, and chromatin immunoprecipitation data, we find evidence of cell-type-specific characteristics, including the ability to identify transcription start sites and locations of different chromatin marks utilized in these cells. In addition, and unexpectedly, our analyses have uncovered detailed features of nucleosome structure.

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Super-resolution chromatin tracing reveals domains and cooperative interactions in single cells.

Project description:The spatial organization of chromatin is pivotal for regulating genome functions. We report an imaging method for tracing chromatin organization with kilobase- and nanometer-scale resolution, unveiling chromatin conformation across topologically associating domains (TADs) in thousands of individual cells. Our imaging data revealed TAD-like structures with globular conformation and sharp domain boundaries in single cells. The boundaries varied from cell to cell, occurring with nonzero probabilities at all genomic positions but preferentially at CCCTC-binding factor (CTCF)- and cohesin-binding sites. Notably, cohesin depletion, which abolished TADs at the population-average level, did not diminish TAD-like structures in single cells but eliminated preferential domain boundary positions. Moreover, we observed widespread, cooperative, multiway chromatin interactions, which remained after cohesin depletion. These results provide critical insight into the mechanisms underlying chromatin domain and hub formation.

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