5C Chromatin interactions in the Igh locus in resting splenic B cells
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PROVIDER: PRJNA761346 | ENA |
REPOSITORIES: ENA
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Project description:These tracks include chromatin interaction data produced using the 5C (chromatin conformation capture carbon copy) method by the Kenter Lab located at the University of Illinois College of Medicine, Chicago, IL. These tracks show looping interactions across the Igh locus using alternating forward and reverse primer design scheme. The 3C method uses formaldehyde crosslinking to covalently associate interacting chromatin segments in intact cells. The cells are then lysed and chromatin is digested with the Hind III restriction enzyme. The digested fragments are ligated under dilute conditions to promote intra-molecular ligation. A genome-wide interaction library of ligation products corresponding to all possible chromatin interactions is produced by this method. In 5C assays, over 12,000 potential ligation products specific to the Igh locus are detected by PCR using multiplexed primer pairs. Here we focused on the 3’ end of the Igh locus to evaluate the status of the constant region domain of the locus in LPS+IL4 activated splenic B cells. We observe that the configuration of the 3’ end of the Igh locus spanning the CH region genes assumes a developmental stage specific configuration in B lineage B cells. We find that the interaction frequency and activation state of the 3’ enhancer increases as B cells mature.
2021-11-23 | GSE183574 | GEO
Project description:These tracks include chromatin interaction data produced using the 5C (chromatin conformation capture carbon copy) method by the Kenter Lab located at the University of Illinois College of Medicine, Chicago, IL. These tracks show looping interactions across the Igh locus using alternating forward and reverse primer design scheme. The 3C method uses formaldehyde crosslinking to covalently associate interacting chromatin segments in intact cells. The cells are then lysed and chromatin is digested with the Hind III restriction enzyme. The digested fragments are ligated under dilute conditions to promote intra-molecular ligation. A genome-wide interaction library of ligation products corresponding to all possible chromatin interactions is produced by this method. In 5C assays, over 12,000 potential ligation products specific to the Igh locus are detected by PCR using multiplexed primer pairs. Here we focused on the 3’ end of the Igh locus to evaluate the status of the constant region domain of the locus in LPS+IL4 activated splenic B cells. We observe that the configuration of the 3’ end of the Igh locus spanning the CH region genes assumes a developmental stage specific configuration in B lineage B cells. We find that the interaction frequency and activation state of the 3’ enhancer increases as B cells mature.
2021-11-23 | GSE183195 | GEO
Project description:These tracks include chromatin interaction data produced using the 5C (chromatin conformation capture carbon copy) method by the Kenter Lab located at the University of Illinois College of Medicine, Chicago, IL. These tracks show looping interactions across the Igh locus using alternating forward and reverse primer design scheme. The 3C method uses formaldehyde crosslinking to covalently associate interacting chromatin segments in intact cells. The cells are then lysed and chromatin is digested with the Hind III restriction enzyme. The digested fragments are ligated under dilute conditions to promote intra-molecular ligation. A genome-wide interaction library of ligation products corresponding to all possible chromatin interactions is produced by this method. In 5C assays, over 12,000 potential ligation products specific to the Igh locus are detected by PCR using multiplexed primer pairs. These studies have revealed three conserved topological sub-domains. Each topological folds encompasses a major VH gene family. The Pax5 transcription factor organizes the topological sub-domain that spans the VHJ558 gene family. In the absence of Pax5, the distal J558 VH genes fail to associate with the proximal VH genes, thus providing an explanation for reduced VHJ558 gene rearrangements in Pax5-deficient pro-B cells. We propose that Igh locus contraction is the cumulative effect of several independently controlled chromatin sub-domains that provide the structural infrastructure to coordinate optimal antigen receptor assembly (Montefiori et al. 2015). We also note that the configuration of the 3’ end of the Igh locus spanning the CH region genes assumes a developmental stage specific configuration in pro-B cells that appreas to skew class switch recombination to specific isotypes. This 3D spatial configuration is lost in resting splenic B cells that are capable of class switch recombination to all isotypes (Kumar et al. 2013).
2016-02-02 | GSE76086 | GEO
Project description:5C Chromatin interactions in the Igh locus in activated splenic B cells
| PRJNA759597 | ENA
Project description:We report the application of 4C-seq for analysis of the 3’ end of he Igh locus during B cell development. We generated genome-wide 4C maps for BM derived Rag2-/- pro-B cells, resting splenic B cells, LPS+IL4 activated B cells and ConA stimulated splenic T cells using two viewpoints, Em and hs4 located in 3’Ea. We find that long range interactions are present only on B lineage cells reflecting enhancer activation status.
2021-11-23 | GSE183006 | GEO
Project description:Hemophagocytes are activated macrophages seen morphologically to have engulfed other hematopoietic cells. Their function is unknown. Attempts to induce these cells in vitro or purify them ex vivo have been unsuccessful. We isolated HPCs and resting splenic macrophages by laser capture microdissection. RNA was isolated from captured cells and microarray performed to compare the activation state of HPCs versus resting splenic macrophages.
2013-12-31 | GSE47430 | GEO
Project description:Hemophagocytes are activated macrophages seen morphologically to have engulfed other hematopoietic cells. Their function is unknown. Attempts to induce these cells in vitro or purify them ex vivo have been unsuccessful. We isolated HPCs and resting splenic macrophages by laser capture microdissection. RNA was isolated from captured cells and microarray performed to compare the activation state of HPCs versus resting splenic macrophages. We treated WT mice with PBS or CpG1826 and an IL-10receptor blocking antibody. Cells were captured from splenic touch preps on PEN-coated slides, RNA isolated by WT-Ovation One-Direct Amplification System and assayed on Affymetrix mouse gene ST 1.0 chips.
2013-12-31 | E-GEOD-47430 | biostudies-arrayexpress
Project description:We evaluated by RNA-seq obveral transcripts in B cells (resting and activated for 2 days with LPS) sorted from several KO mice models devoid of portion or all the IgH 3' Regulatory Region One RNA-seq point was realized per condition (resting or stimulated) and per genotype. Each point corresponds to a pool of equivalent number of B cells sorted from 4 animals
2016-03-02 | E-GEOD-76217 | biostudies-arrayexpress
Project description:We evaluated by RNA-seq obveral transcripts in B cells (resting and activated for 2 days with LPS) sorted from several KO mice models devoid of portion or all the IgH 3' Regulatory Region
2016-03-02 | GSE76217 | GEO
Project description:Amartya Sanyal mailto:amartya.sanyal@umassmed.edu (Wet Lab), Bryan R. Lajoie mailto:bryan.lajoie@umassmed.edu, Gaurav Jain mailto:gaurav.jain@umassmed.edu (Dry Lab), Job Dekker mailto:job.dekker@umassmed.edu (Principal Investigator) This track contains chromatin interaction data generated using the 5C (Chromatin Conformation Capture Carbon Copy) method by the ENCODE group (Dekker Lab) located at the University of Massachusetts, Worcester, MA. This track shows the significant looping interactions between transcriptional start sites (TSS) and distal regulatory elements in the context of the 44 ENCODE pilot regions spanning 1% of the human genome. Although the DNA is a linear sequence, the chromatin, which is packed and organized inside the nucleus, does not function linearly. This is most clearly illustrated by the fact that genes are often regulated by elements that are located hundreds of kilobases away in the linear genome. Imaging techniques have shown that regulatory elements can act over large genomic distances by engaging in direct physical interactions with target genes, resulting in the formation of chromatin loops. Based on these observations, we have envisaged that the spatial organization of the genome resembles a three-dimensional network that is driven by physical associations between genes and regulatory elements, both in cis (within the same chromosome) and in trans (between different chromosomes) (Dekker, 2006). Apart from imaging technology which is labor intensive and low-throughput, long-range chromatin looping interactions can be detected using the Chromosome Conformation Capture (3C) technology (Dekker et al., 2002). The 3C method employs formaldehyde cross-linking to covalently link interacting chromatin segments in intact cells. Cells are subsequently lysed and chromatin is digested with a restriction enzyme of choice. The digested fragments are then ligated under dilute conditions to facilitate intramolecular ligation. The result is a genome-wide interaction library of ligation products corresponding to all possible chromatin interactions. Specific ligation products can then be detected by PCR using specific primer pairs. The 5C method was developed to dramatically increase 3C throughput (Dostie et al., 2006; Dostie and Dekker, 2007). The 5C method greatly increases the scale of chromatin interaction detection by replacing the PCR detection step of 3C with ligation-mediated amplification (LMA). LMA is advantageous due to a much higher level of multiplexing by using thousands of primers in a single reaction to detect millions of chromatin interactions (ligation junctions) in parallel. The LMA step effectively "copies" 3C ligation products into much smaller 5C ligation products that precisely correspond to ligation junctions formed during the 3C procedure. The products of the multiplexed LMA reaction constitute the 5C library. The composition of the 5C library is determined using high-throughput DNA sequencing. For data usage terms and conditions, please refer to http://www.genome.gov/27528022 and http://www.genome.gov/Pages/Research/ENCODE/ENCODEDataReleasePolicyFinal2008.pdf The aim of the pilot study was to generate a "connectivity map" between transcription start sites (TSS) and distal regulatory elements within the 44 ENCODE PILOT regions. In the current scheme, 5C primers were designed for all HindIII restriction fragments. Reverse primers were designed on fragments containing the TSS of annotated genes. Forward primers were designed on all other fragments. This design allowed for the interrogation of all TSS with all other restriction fragments, thus generating an interaction map between TSS and regulatory elements. For gene desert ENCODE pilot regions (for example ENr313), an altered scheme of forward and reverse primers was designed. Primers were selected for relative uniqueness using a custom 15-mer frequency table and BLAST. A custom hexamer barcode was added to each primer to ensure the sequence was unique relative to the primer pool being used. Primers were also selected for the appropriate melting temperature and GC-content and a universal tail sequence for amplification. The 44 ENCODE regions were analyzed in two groups using two separate 5C primer pools. The first group (ENm) contained the manually-picked ENCODE regions, ENm001-014 and ENr313. The second group (ENr) contained the 30 randomly-picked ENCODE regions. The two 5C primer pools were made by pooling 5C primers for interrogating long-range interactions in the two groups of ENCODE regions. The primer pool for the ENm group contained a total of 3,150 primers (476 reverse 5C primers and 2674 forward 5C primers). This primer pool allowed interrogation of a total of 1,272,824 interactions. Of these, 83,427 interactions were between fragments that were both located in the same ENCODE region. This primer pool for the ENr group contained a total of 3,152 primers (505 reverse 5C primers and 2647 forward 5C primers). This primer pool allowed interrogation of a total of 1,336,735 interactions. Of these, 34,859 interactions were between fragments that were both located in the same ENCODE region. In total, 981 reverse primers and 5,321 forward primers were designed (corresponding to ~77.1% (6,302/8,174) of all HindIII fragments in the 44 ENCODE regions). Currently, data for two biological replicates have been generated for ENCODE Tier I (GM12878 and K562), Tier II (HeLa-S3), and H1 human embryonic stem cells (H1-hESC), spanning 14 ENCODE manual regions along with one random region (ENr313) as well as 30 random regions separately using high-throughput paired-end sequencing in the Illumina GA2 platform. The looping interactions, which are detected in both the biological replicates, are considered significant.
2012-07-18 | E-GEOD-39510 | biostudies-arrayexpress