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CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning

ABSTRACT: CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning

PROVIDER: PRJNA449766 | ENA |

REPOSITORIES: ENA

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CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 3]

Project description:CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 3]

| PRJNA449768 | ENA

CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 1]

Project description:CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 1]

| PRJNA448945 | ENA

CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 2]

Project description:CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 2]

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CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 3]

Project description:RAG endonuclease initiates antibody heavy chain variable region exon assembly from V, D, and J segments within a chromosomal V(D)J recombination center (RC) by cleaving between paired gene segments and flanking recombination signal sequences (RSSs). The IGCR1 control region promotes DJH intermediate formation by isolating Ds, JHs, and RC from upstream VHs in a chromatin loop anchored by CTCF-binding elements ("CBEs"). How VHs access the DJHRC for VH to DJH rearrangement was unknown. We report that CBEs immediately downstream of frequently rearranged VH-RSSs increase recombination potential of their associated VH far beyond that provided by RSSs alone. This CBE activity becomes particularly striking upon IGCR1 inactivation, which allows RAG, likely via loop extrusion, to linearly scan chromatin far upstream. VH-associated CBEs stabilize interactions of D-proximal VHs first encountered by the DJHRC during linear RAG scanning and, thereby, promote dominant rearrangement of these VHs by an unanticipated chromatin accessibility-enhancing CBE function.

2018-07-03 | GSE113022 | GEO

CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 2]

2018-07-03 | GSE112822 | GEO

CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning [dataset 1]

2018-07-03 | GSE112781 | GEO

CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning.

Project description: Not available

| S-EPMC6026039 | biostudies-literature

CTCF-Binding Elements Mediate Accessibility of RAG Substrates During Chromatin Scanning

Project description:This SuperSeries is composed of the SubSeries listed below.

2018-07-03 | GSE113023 | GEO

CTCF orchestrates long-range cohesin-driven V(D)J recombinational scanning [GRO-Seq]

Project description:RAG endonuclease initiates V(D)J recombination in progenitor (pro)-B cells. Upon binding a recombination center (RC)-based JH, RAG scans upstream chromatin via loop extrusion, potentially mediated by cohesin, to locate Ds and assemble a DJH-based RC. CTCF looping factor-bound elements (CBEs) within the IGCR1 element upstream of the Ds impede RAG-scanning; but their inactivation allows scanning to proximal VHs where additional CBEs activate rearrangement and impede scanning any further upstream. Distal VH utilization is thought to involve diffusional RC access following large-scale Igh locus contraction. Here, we test the potential of linear RAG-scanning to mediate distal VH usage in G1-arrested, v-Abl-pro-B cell lines, which undergo robust D-to-JH rearrangement, but little VH-to-DJH rearrangement, presumably due to lack of locus contraction. Through an auxin-induced approach, we degrade cohesin-component Rad21 or CTCF in these G1-arrested lines, which maintain substantial viability throughout four-day experiments. Rad21 degradation eliminated all V(D)J recombination and RAG-scanning-associated interactions, except RC-located DQ52-to-JH joining in which synapsis occurs by diffusion11. Remarkably, while CTCF degradation suppressed most CBE-based chromatin interactions, it promoted robust RC interactions with, and VH-to-DJH joining of, distal VHs, with patterns similar to those of "locus-contracted" primary pro-B cells. Thus, down-modulation of CTCF-bound scanning-impediment activity promotes cohesin-driven RAG-scanning across the 2.7Mb Igh locus.

2020-05-11 | GSE142780 | GEO

CTCF orchestrates long-range cohesin-driven V(D)J recombinational scanning [ChIP-Seq]

2020-05-11 | GSE142779 | GEO

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