Similar Datasets
Project description:The RAG endonuclease initiates Igh locus V(D)J recombination in progenitor (pro)-B cells1. Upon binding a recombination centre-based JH, RAG scans upstream chromatin via loop extrusion, potentially mediated by cohesin, to locate Ds and assemble a DJH-based recombination centre2. CTCF looping factor-bound elements (CBEs) within IGCR1 upstream of Ds impede RAG scanning3-5; however, their inactivation allows scanning to proximal VHs, where additional CBEs activate rearrangement and impede scanning any further upstream5. Distal VH utilization is thought to involve diffusional access to the recombination centre following large-scale Igh locus contraction6-8. Here we test the potential of linear RAG scanning to mediate distal VH usage in G1-arrested v-Abl pro-B cell lines9, which undergo robust D-to-JH but little VH-to-DJH rearrangements, presumably owing to lack of locus contraction2,5. Through an auxin-inducible approach10, we degraded the cohesin component RAD2110-12 or CTCF12,13 in these G1-arrested lines. Degradation of RAD21 eliminated all V(D)J recombination and interactions associated with RAG scanning, except for reecombination centre-located DQ52-to-JH joining, in which synapsis occurs by diffusion2. Remarkably, while degradation of CTCF suppressed most CBE-based chromatin interactions, it promoted robust recombination centre interactions with, and robust VH-to-DJH joining of, distal VHs, with patterns similar to those of 'locus-contracted' primary pro-B cells. Thus, downmodulation of CTCF-bound scanning-impediment activity promotes cohesin-driven RAG scanning across the 2.7-Mb Igh locus.
| S-EPMC7554077 | biostudies-literature
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 | GSE142779 | GEO
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 | GSE142778 | GEO
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 | GSE142777 | GEO
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
Project description:CTCF orchestrates long-range cohesin-driven V(D)J recombinational scanning
| PRJNA598322 | ENA
Project description:CTCF orchestrates long-range cohesin-driven V(D)J recombinational scanning [3C-HTGTS]
| PRJNA598325 | ENA
Project description:CTCF orchestrates long-range cohesin-driven V(D)J recombinational scanning [ChIP-Seq]
| PRJNA598324 | ENA
Project description:CTCF orchestrates long-range cohesin-driven V(D)J recombinational scanning [LAM-HTGTS]
| PRJNA598326 | ENA
Project description:CTCF orchestrates long-range cohesin-driven V(D)J recombinational scanning [GRO-Seq]
| PRJNA598323 | ENA