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Haque F, Honjo T, Begum NA. XLID syndrome gene Med12 promotes Ig isotype switching through chromatin modification and enhancer RNA regulation. SCIENCE ADVANCES 2022; 8:eadd1466. [PMID: 36427307 PMCID: PMC9699684 DOI: 10.1126/sciadv.add1466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The transcriptional coactivator Med12 regulates gene expression through its kinase module. Here, we show a kinase module-independent function of Med12 in CSR. Med12 is essential for super-enhancer activation by collaborating with p300-Jmjd6/Carm1 coactivator complexes. Med12 loss decreases H3K27 acetylation and eRNA transcription with concomitant impairment of AID-induced DNA breaks, S-S synapse formation, and 3'RR-Eμ interaction. CRISPR-dCas9-mediated enhancer activation reestablishes the epigenomic and transcriptional hallmarks of the super-enhancer and fully restores the Med12 depletion defects. Moreover, 3'RR-derived eRNAs are critical for promoting S region epigenetic regulation, synapse formation, and recruitment of Med12 and AID to the IgH locus. We find that XLID syndrome-associated Med12 mutations are defective in both 3'RR eRNA transcription and CSR, suggesting that B and neuronal cells may have cell-specific super-enhancer dysfunctions. We conclude that Med12 is essential for IgH 3'RR activation/eRNA transcription and plays a central role in AID-induced antibody gene diversification and genomic instability in B cells.
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Affiliation(s)
- Farazul Haque
- Department of Immunology and Genomic Medicine, Graduate School of Medicine, Kyoto University, Yoshida, Sakyo-Ku, Kyoto 606-8501, Japan
| | - Tasuku Honjo
- Department of Immunology and Genomic Medicine, Graduate School of Medicine, Kyoto University, Yoshida, Sakyo-Ku, Kyoto 606-8501, Japan
| | - Nasim A Begum
- Department of Immunology and Genomic Medicine, Graduate School of Medicine, Kyoto University, Yoshida, Sakyo-Ku, Kyoto 606-8501, Japan
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2
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Ferrad M, Ghazzaui N, Issaoui H, Drouineau E, Oblet C, Marchiol T, Cook-Moreau J, Denizot Y. Homozygous iMycCα transgenic mice as a model of plasma B-cell lymphomas. Leuk Lymphoma 2022; 63:2114-2125. [DOI: 10.1080/10428194.2022.2064989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Melissa Ferrad
- UMR CNRS 7276, INSERM U1262, Equipe Labellisée LIGUE 2018, Université de Limoges, Limoges, France
| | - Nour Ghazzaui
- UMR CNRS 7276, INSERM U1262, Equipe Labellisée LIGUE 2018, Université de Limoges, Limoges, France
| | - Hussein Issaoui
- UMR CNRS 7276, INSERM U1262, Equipe Labellisée LIGUE 2018, Université de Limoges, Limoges, France
| | - Emilie Drouineau
- I2BC, IBITEC-S, CEA, CNRS, Université Paris‐Sud, Université Paris‐Saclay, Gif-sur-Yvette, France
| | - Christelle Oblet
- UMR CNRS 7276, INSERM U1262, Equipe Labellisée LIGUE 2018, Université de Limoges, Limoges, France
| | - Tiffany Marchiol
- UMR CNRS 7276, INSERM U1262, Equipe Labellisée LIGUE 2018, Université de Limoges, Limoges, France
| | - Jeanne Cook-Moreau
- UMR CNRS 7276, INSERM U1262, Equipe Labellisée LIGUE 2018, Université de Limoges, Limoges, France
| | - Yves Denizot
- UMR CNRS 7276, INSERM U1262, Equipe Labellisée LIGUE 2018, Université de Limoges, Limoges, France
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3
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Kasprzyk ME, Sura W, Dzikiewicz-Krawczyk A. Enhancing B-Cell Malignancies-On Repurposing Enhancer Activity towards Cancer. Cancers (Basel) 2021; 13:3270. [PMID: 34210001 PMCID: PMC8269369 DOI: 10.3390/cancers13133270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/24/2021] [Accepted: 06/28/2021] [Indexed: 01/19/2023] Open
Abstract
B-cell lymphomas and leukemias derive from B cells at various stages of maturation and are the 6th most common cancer-related cause of death. While the role of several oncogenes and tumor suppressors in the pathogenesis of B-cell neoplasms was established, recent research indicated the involvement of non-coding, regulatory sequences. Enhancers are DNA elements controlling gene expression in a cell type- and developmental stage-specific manner. They ensure proper differentiation and maturation of B cells, resulting in production of high affinity antibodies. However, the activity of enhancers can be redirected, setting B cells on the path towards cancer. In this review we discuss different mechanisms through which enhancers are exploited in malignant B cells, from the well-studied translocations juxtaposing oncogenes to immunoglobulin loci, through enhancer dysregulation by sequence variants and mutations, to enhancer hijacking by viruses. We also highlight the potential of therapeutic targeting of enhancers as a direction for future investigation.
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4
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Bruzeau C, Moreau J, Le Noir S, Pinaud E. Panorama of stepwise involvement of the IgH 3' regulatory region in murine B cells. Adv Immunol 2021; 149:95-114. [PMID: 33993921 DOI: 10.1016/bs.ai.2021.03.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Among the multiple events leading to immunoglobulin (Ig) expression in B cells, stepwise activation of the Ig heavy chain locus (IgH) is of critical importance. Transcription regulation of the complex IgH locus has always been an interesting viewpoint to unravel the multiple and complex events required for IgH expression. First, regulatory germline transcripts (GLT) assist DNA remodeling events such as VDJ recombination, class switch recombination (CSR) and somatic hypermutation (SHM). Second, productive spliced transcripts restrict heavy chain protein expression associated either with the surface receptor of developing B cells or secreted in large amounts in plasma cells. One main transcriptional regulator for IgH lies at its 3' extremity and includes both a set of enhancers grouped in a large 3' regulatory region (3'RR) and a cluster of 3'CTCF-binding elements (3'CBEs). In this focused review, we will preferentially refer to evidence reported for the murine endogenous IgH locus, whether it is wt or carries deletions or insertions within the IgH 3' boundary and associated regulatory region.
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Affiliation(s)
- Charlotte Bruzeau
- CNRS, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, Limoges, France; INSERM, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 1262, Limoges, France; Université de Limoges, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, UMR 1262, Limoges, France
| | - Jeanne Moreau
- CNRS, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, Limoges, France; INSERM, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 1262, Limoges, France; Université de Limoges, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, UMR 1262, Limoges, France
| | - Sandrine Le Noir
- CNRS, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, Limoges, France; INSERM, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 1262, Limoges, France; Université de Limoges, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, UMR 1262, Limoges, France
| | - Eric Pinaud
- CNRS, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, Limoges, France; INSERM, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 1262, Limoges, France; Université de Limoges, Contrôle de la Réponse Immune B et des Lymphoproliférations, UMR 7276, UMR 1262, Limoges, France.
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5
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Ghazzaui N, Issaoui H, Ferrad M, Carrion C, Cook-Moreau J, Denizot Y, Boyer F. Eμ and 3'RR transcriptional enhancers of the IgH locus cooperate to promote c-myc-induced mature B-cell lymphomas. Blood Adv 2020; 4:28-39. [PMID: 31899800 PMCID: PMC6960469 DOI: 10.1182/bloodadvances.2019000845] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 11/12/2019] [Indexed: 01/18/2023] Open
Abstract
Numerous B-cell lymphomas feature translocations linking oncogenes to different locations in the immunoglobulin heavy chain (IgH) locus. During Burkitt lymphoma (BL), IgH breakpoints for c-myc translocation stand either close to JH segments or within switch regions. Transcription, accessibility, and remodeling of the IgH locus are under the control of the 2 potent cis-acting enhancer elements: Eμ and the 3' regulatory region (3'RR). To ensure their respective contributions to oncogene deregulation in the context of the endogenous IgH locus, we studied transgenic mice harboring a knock-in of c-myc in various positions of the IgH locus (3' to JH segments, 5' to Cμ with Eμ deletion and Cα). The observed spectrum of tumors, kinetics of emergence, and transcriptome analysis provide strong evidence that both Eμ and 3'RR deregulate c-myc and cooperate together to promote B-cell lymphomagenesis. Transgenics mimicking endemic BL (with c-myc placed 3' to JH segments) exhibited the highest rate of B-cell lymphoma emergence, the highest Ki67 index of proliferation, and the highest transcriptomic similarities to human BL. The 3'RR enhancer alone deregulated c-myc and initiated the development of BL-like lymphomas, suggesting that its targeting would be of therapeutic interest to reduce c-myc oncogenicity in vivo.
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Affiliation(s)
- Nour Ghazzaui
- Unité Mixte de Recherche Centre National de la Recherche Scientifique 7276, Institut National de la Santé et de la Recherche Médicale U1262, Equipe Labellisée Ligue 2018, Université de Limoges, Limoges, France
| | - Hussein Issaoui
- Unité Mixte de Recherche Centre National de la Recherche Scientifique 7276, Institut National de la Santé et de la Recherche Médicale U1262, Equipe Labellisée Ligue 2018, Université de Limoges, Limoges, France
| | - Mélissa Ferrad
- Unité Mixte de Recherche Centre National de la Recherche Scientifique 7276, Institut National de la Santé et de la Recherche Médicale U1262, Equipe Labellisée Ligue 2018, Université de Limoges, Limoges, France
| | - Claire Carrion
- Unité Mixte de Recherche Centre National de la Recherche Scientifique 7276, Institut National de la Santé et de la Recherche Médicale U1262, Equipe Labellisée Ligue 2018, Université de Limoges, Limoges, France
| | - Jeanne Cook-Moreau
- Unité Mixte de Recherche Centre National de la Recherche Scientifique 7276, Institut National de la Santé et de la Recherche Médicale U1262, Equipe Labellisée Ligue 2018, Université de Limoges, Limoges, France
| | - Yves Denizot
- Unité Mixte de Recherche Centre National de la Recherche Scientifique 7276, Institut National de la Santé et de la Recherche Médicale U1262, Equipe Labellisée Ligue 2018, Université de Limoges, Limoges, France
| | - François Boyer
- Unité Mixte de Recherche Centre National de la Recherche Scientifique 7276, Institut National de la Santé et de la Recherche Médicale U1262, Equipe Labellisée Ligue 2018, Université de Limoges, Limoges, France
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6
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Issaoui H, Ghazzaui N, Ferrad M, Lecardeur S, Denizot Y. [Cis-regulatory elements of the IgH locus and B1 and B2 B-cell maturation]. Med Sci (Paris) 2019; 35:295-297. [PMID: 31038104 DOI: 10.1051/medsci/2019060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Affiliation(s)
- Hussein Issaoui
- UMR CNRS 7276, Inserm U1262, Équipe labellisée Ligue 2018, Université de Limoges, CBRS, Rue Professeur Descottes, 87025 Limoges, France
| | - Nour Ghazzaui
- UMR CNRS 7276, Inserm U1262, Équipe labellisée Ligue 2018, Université de Limoges, CBRS, Rue Professeur Descottes, 87025 Limoges, France
| | - Mélissa Ferrad
- UMR CNRS 7276, Inserm U1262, Équipe labellisée Ligue 2018, Université de Limoges, CBRS, Rue Professeur Descottes, 87025 Limoges, France
| | - Sandrine Lecardeur
- UMR CNRS 7276, Inserm U1262, Équipe labellisée Ligue 2018, Université de Limoges, CBRS, Rue Professeur Descottes, 87025 Limoges, France
| | - Yves Denizot
- UMR CNRS 7276, Inserm U1262, Équipe labellisée Ligue 2018, Université de Limoges, CBRS, Rue Professeur Descottes, 87025 Limoges, France
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7
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The immunoglobulin heavy chain 3' regulatory region superenhancer controls mouse B1 B-cell fate and late VDJ repertoire diversity. Blood Adv 2019; 2:252-262. [PMID: 29437640 DOI: 10.1182/bloodadvances.2017014423] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 12/27/2017] [Indexed: 01/18/2023] Open
Abstract
The immunoglobulin heavy chain (IgH) 3' regulatory region (3'RR) superenhancer controls B2 B-cell IgH transcription and cell fate at the mature stage but not early repertoire diversity. B1 B cells represent a small percentage of total B cells differing from B2 B cells by several points such as precursors, development, functions, and regulation. B1 B cells act at the steady state to maintain homeostasis in the organism and during the earliest phases of an immune response, setting them at the interface between innate and acquired immunity. We investigated the role of the 3'RR superenhancer on B1 B-cell fate. Similar to B2 B cells, the 3'RR controls μ transcription and cell fate in B1 B cells. In contrast to B2 B cells, 3'RR deletion affects B1 B-cell late repertoire diversity. Thus, differences exist for B1 and B2 B-cell 3'RR control during B-cell maturation. For the first time, these results highlight the contribution of the 3'RR superenhancer at this interface between innate and acquired immunity.
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8
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Trans-silencing effect of the 3'RR immunoglobulin heavy chain enhancer on Igκ transcription at the pro-B cell stage. Cell Mol Immunol 2018; 16:668-670. [PMID: 30523346 DOI: 10.1038/s41423-018-0189-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 11/07/2018] [Indexed: 01/18/2023] Open
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9
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Mediator contributes to IgH locus VDJ rearrangements by promoting usage of most distal V segments. Cell Mol Immunol 2018; 17:407-409. [PMID: 30405149 DOI: 10.1038/s41423-018-0175-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 10/08/2018] [Indexed: 11/08/2022] Open
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10
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Ghazzaui N, Issaoui H, Boyer F, Martin OA, Saintamand A, Denizot Y. 3'RR and 5'E μ immunoglobulin heavy chain enhancers are independent engines of locus remodeling. Cell Mol Immunol 2018; 16:198-200. [PMID: 30305688 DOI: 10.1038/s41423-018-0171-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 09/17/2018] [Indexed: 02/06/2023] Open
Affiliation(s)
- Nour Ghazzaui
- CNRS UMR 7276, Inserm U1262, Université de Limoges, Limoges, France
| | - Hussein Issaoui
- CNRS UMR 7276, Inserm U1262, Université de Limoges, Limoges, France
| | - François Boyer
- CNRS UMR 7276, Inserm U1262, Université de Limoges, Limoges, France
| | | | - Alexis Saintamand
- CNRS UMR 7276, Inserm U1262, Université de Limoges, Limoges, France.,Inserm U1236, Université Rennes 1, Rennes, France
| | - Yves Denizot
- CNRS UMR 7276, Inserm U1262, Université de Limoges, Limoges, France.
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11
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Lin SG, Ba Z, Alt FW, Zhang Y. RAG Chromatin Scanning During V(D)J Recombination and Chromatin Loop Extrusion are Related Processes. Adv Immunol 2018; 139:93-135. [PMID: 30249335 DOI: 10.1016/bs.ai.2018.07.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An effective adaptive immune system depends on the ability of developing B and T cells to generate diverse immunoglobulin (Ig) and T cell receptor repertoires, respectively. Such diversity is achieved through a programmed somatic recombination process whereby germline V, D, and J segments of antigen receptor loci are assembled to form the variable region V(D)J exons of Ig and TCRs. Studies of this process, termed V(D)J recombination, have provided key insights into our understanding of a variety of general gene regulatory and DNA repair processes over the last several decades. V(D)J recombination is initiated by the RAG endonuclease which generates DNA double-stranded breaks at the borders of V, D, and J segments. In this review, we cover recent work that has elucidated RAG structure and work that revealed that RAG has a novel chromatin scanning activity, likely mediated by chromatin loop extrusion, that contributes to its ability to locate V, D, J gene segment substrates within large chromosomal loop domains bounded by CTCF-binding elements (CBEs). This latter function, coupled with the role CBE-based chromatin loop domains and subdomains within them play in focusing V(D)J recombination activity within antigen receptor loci, provide mechanistic explanations for long-standing questions regarding V(D)J segment usage diversification and in limiting potentially deleterious off-target RAG-initiated recombination events genome-wide. This review will focus mainly on studies of the mouse Ig heavy chain locus, but the principles described also apply to other Ig loci and to TCR loci in mice and humans.
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Affiliation(s)
- Sherry G Lin
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, and Department of Genetics, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, United States
| | - Zhaoqing Ba
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, and Department of Genetics, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, United States
| | - Frederick W Alt
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, and Department of Genetics, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, United States.
| | - Yu Zhang
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, and Department of Genetics, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, United States
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12
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Deletion of the immunoglobulin heavy chain 3' regulatory region super-enhancer affects somatic hypermutation in B1 B cells. Cell Mol Immunol 2018; 16:195-197. [PMID: 30127379 DOI: 10.1038/s41423-018-0091-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 07/04/2018] [Indexed: 01/18/2023] Open
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13
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The IgH 3' regulatory region and c-myc-induced B-cell lymphomagenesis. Oncotarget 2018; 8:7059-7067. [PMID: 27729620 PMCID: PMC5351691 DOI: 10.18632/oncotarget.12535] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/05/2016] [Indexed: 01/18/2023] Open
Abstract
Deregulation and mutations of c-myc have been reported in multiple mature B-cell malignancies such as Burkitt lymphoma, myeloma and plasma cell lymphoma. After translocation into the immunoglobulin heavy chain (IgH) locus, c-myc is constitutively expressed under the control of active IgH cis-regulatory enhancers. Those located in the IgH 3 regulatory region (3RR) are master control elements of transcription. Over the past decade numerous convincing demonstrations of 3RRs contribution to mature c-myc-induced lymphomagenesis have been made using transgenic models with various types of IgH-c-myc translocations and transgenes. This review highlights how IgH 3RR physiological functions play a critical role in c-myc deregulation during lymphomagenesis.
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14
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Efficient role of IgH 3' regulatory region deficient B-cells in the development of oil granulomas. Oncotarget 2018; 7:38741-38749. [PMID: 27231852 PMCID: PMC5122425 DOI: 10.18632/oncotarget.9588] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Accepted: 04/29/2016] [Indexed: 01/18/2023] Open
Abstract
Functional B-cells are essential for the formation of oil granulomas. The IgH 3′ regulatory region (3′RR) activates important check-points during B-cell maturation. We investigated if 3′RR-deficient B-cells remain efficient to develop oil granulomas in response to pristine. B-cells expressing an IgH 3′RR-deficient allele were similarly recruited to wild type allele expressing B-cells in the granuloma. No differences were observed between 3′RR-deficient mice and control mice for granuloma numbers, cellular composition and ability to express mRNA transcripts for several pro- and anti-inflammatory cytokines. Altogether these results suggest a normal role for 3′RR-deficient B-cells in the development of an acute B-cell-mediated inflammatory response.
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15
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Saintamand A, Ghazzaui N, Issaoui H, Denizot Y. [The IgH 3'RR: Doctor Jekyll and Mister Hyde of B-cell maturation and lymphomagenesis]. Med Sci (Paris) 2017; 33:963-970. [PMID: 29200394 DOI: 10.1051/medsci/20173311013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The four transcriptional enhancers located in the 3' regulatory region (3'RR) of the IgH locus control the late phases of B-cell maturation, namely IgH locus transcription, somatic hypermutation and class switch recombination. Doctor Jekyll by nature, the 3'RR acts as Mister Hyde in case of oncogenic translocation at the IgH locus taking under its transcriptional control the translocated oncogene. The aim of this review is to show this duality on the basis of the latest scientific advances in the structure and function of the 3'RR and to hIghlight the targeting of the 3'RR as a potential therapeutic approach in mature B-cell lymphomas.
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Affiliation(s)
- Alexis Saintamand
- UMR CNRS 7276, Université de Limoges, rue Pr Descottes, 87025 Limoges, France
| | - Nour Ghazzaui
- UMR CNRS 7276, Université de Limoges, rue Pr Descottes, 87025 Limoges, France
| | - Hussein Issaoui
- UMR CNRS 7276, Université de Limoges, rue Pr Descottes, 87025 Limoges, France
| | - Yves Denizot
- UMR CNRS 7276, Université de Limoges, rue Pr Descottes, 87025 Limoges, France
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16
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Le Noir S, Boyer F, Lecardeur S, Brousse M, Oruc Z, Cook-Moreau J, Denizot Y, Cogné M. Functional anatomy of the immunoglobulin heavy chain 3΄ super-enhancer needs not only core enhancer elements but also their unique DNA context. Nucleic Acids Res 2017; 45:5829-5837. [PMID: 28369649 PMCID: PMC5449612 DOI: 10.1093/nar/gkx203] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 03/22/2017] [Indexed: 01/04/2023] Open
Abstract
Cis-regulatory elements feature clustered sites for transcription factors, defining core enhancers and have inter-species homology. The mouse IgH 3΄ regulatory region (3'RR), a major B-cell super-enhancer, consists of four of such core enhancers, scattered throughout more than 25 kb of packaging 'junk DNA', the sequence of which is not conserved but follows a unique palindromic architecture which is conserved in all mammalian species. The 3'RR promotes long-range interactions and potential IgH loops with upstream promoters, controlling class switch recombination (CSR) and somatic hypermutation (SHM). It was thus of interest to determine whether this functional architecture also involves the specific functional structure of the super-enhancer itself, potentially promoted by its symmetric DNA shell. Since many transgenic 3'RR models simply linked core enhancers without this shell, it was also important to compare such a 'core 3'RR' (c3'RR) with the intact full-length super-enhancer in an actual endogenous IgH context. Packaging DNA between 3'RR core enhancers proved in fact to be necessary for optimal SHM, CSR and IgH locus expression in plasma cells. This reveals that packaging DNA can matter in the functional anatomy of a super-enhancer, and that precise evaluation of such elements requires full consideration of their global architecture.
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Affiliation(s)
- Sandrine Le Noir
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France
| | - François Boyer
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France
| | - Sandrine Lecardeur
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France
| | - Mylène Brousse
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France
| | - Zeliha Oruc
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France
| | - Jeanne Cook-Moreau
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France
| | - Yves Denizot
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France
| | - Michel Cogné
- UMR 7276 CNRS and Université de Limoges: Contrôle de la Réponse Immune B et Lymphoprolifération, 2 rue du Dr. Descottes, 87025 Limoges, France.,Institut Universitaire de France, Paris, France
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17
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Inducible CTCF insulator delays the IgH 3' regulatory region-mediated activation of germline promoters and alters class switching. Proc Natl Acad Sci U S A 2017; 114:6092-6097. [PMID: 28533409 DOI: 10.1073/pnas.1701631114] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Class switch recombination (CSR) plays an important role in adaptive immune response by enabling mature B cells to switch from IgM expression to the expression of downstream isotypes. CSR is preceded by inducible germline (GL) transcription of the constant genes and is controlled by the 3' regulatory region (3'RR) in a stimulus-dependent manner. Why the 3'RR-mediated up-regulation of GL transcription is delayed to the mature B-cell stage is presently unknown. Here we show that mice devoid of an inducible CTCF binding element, located in the α constant gene, display a marked isotype-specific increase of GL transcription in developing and resting splenic B cells and altered CSR in activated B cells. Moreover, insertion of a GL promoter downstream of the CTCF insulator led to premature activation of the ectopic promoter. This study provides functional evidence that the 3'RR has a developmentally controlled potential to constitutively activate GL promoters but that this activity is delayed, at least in part, by the CTCF insulator, which borders a transcriptionally active domain established by the 3'RR in developing B cells.
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18
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Saintamand A, Vincent-Fabert C, Marquet M, Ghazzaui N, Magnone V, Pinaud E, Cogné M, Denizot Y. E μ and 3'RR IgH enhancers show hierarchic unilateral dependence in mature B-cells. Sci Rep 2017; 7:442. [PMID: 28348365 PMCID: PMC5428668 DOI: 10.1038/s41598-017-00575-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 03/03/2017] [Indexed: 01/18/2023] Open
Abstract
Enhancer and super-enhancers are master regulators of cell fate. While they act at long-distances on adjacent genes, it is unclear whether they also act on one another. The immunoglobulin heavy chain (IgH) locus is unique in carrying two super-enhancers at both ends of the constant gene cluster: the 5'Eμ super-enhancer promotes VDJ recombination during the earliest steps of B-cell ontogeny while the 3' regulatory region (3'RR) is essential for late differentiation. Since they carry functional synergies in mature B-cells and physically interact during IgH locus DNA looping, we investigated if they were independent engines of locus remodelling or if their function was more intimately intermingled, their optimal activation then requiring physical contact with each other. Analysis of chromatin marks, enhancer RNA transcription and accessibility in Eμ- and 3'RR-deficient mice show, in mature activated B-cells, an unilateral dependence of this pair of enhancers: while the 3'RR acts in autonomy, Eμ in contrast likely falls under control of the 3'RR.
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Affiliation(s)
- A Saintamand
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France. .,INSERM U1236, Université Rennes 1, Rennes, France.
| | | | - M Marquet
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France
| | - N Ghazzaui
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France
| | - V Magnone
- CNRS et Université de Nice Sophia Antipolis, Institut de Pharmacologie Moléculaire et Cellulaire, UMR 6097, Sophia, Antipolis, France
| | - E Pinaud
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France
| | - M Cogné
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France
| | - Y Denizot
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France.
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19
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Bolland DJ, Koohy H, Wood AL, Matheson LS, Krueger F, Stubbington MJT, Baizan-Edge A, Chovanec P, Stubbs BA, Tabbada K, Andrews SR, Spivakov M, Corcoran AE. Two Mutually Exclusive Local Chromatin States Drive Efficient V(D)J Recombination. Cell Rep 2016; 15:2475-87. [PMID: 27264181 PMCID: PMC4914699 DOI: 10.1016/j.celrep.2016.05.020] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 03/01/2016] [Accepted: 05/02/2016] [Indexed: 12/02/2022] Open
Abstract
Variable (V), diversity (D), and joining (J) (V(D)J) recombination is the first determinant of antigen receptor diversity. Understanding how recombination is regulated requires a comprehensive, unbiased readout of V gene usage. We have developed VDJ sequencing (VDJ-seq), a DNA-based next-generation-sequencing technique that quantitatively profiles recombination products. We reveal a 200-fold range of recombination efficiency among recombining V genes in the primary mouse Igh repertoire. We used machine learning to integrate these data with local chromatin profiles to identify combinatorial patterns of epigenetic features that associate with active VH gene recombination. These features localize downstream of VH genes and are excised by recombination, revealing a class of cis-regulatory element that governs recombination, distinct from expression. We detect two mutually exclusive chromatin signatures at these elements, characterized by CTCF/RAD21 and PAX5/IRF4, which segregate with the evolutionary history of associated VH genes. Thus, local chromatin signatures downstream of VH genes provide an essential layer of regulation that determines recombination efficiency. VDJ-seq enables precise quantification of antibody V(D)J recombination products Two distinct cis-regulatory designs characterize actively recombining V genes Putative recombination regulatory elements map downstream of mouse Igh V genes Recombination regulatory architecture reflects the V genes’ evolutionary history
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Affiliation(s)
- Daniel J Bolland
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Hashem Koohy
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Andrew L Wood
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Louise S Matheson
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Felix Krueger
- Bioinformatics Group, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Michael J T Stubbington
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Amanda Baizan-Edge
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Peter Chovanec
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Bryony A Stubbs
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Kristina Tabbada
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Simon R Andrews
- Bioinformatics Group, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Mikhail Spivakov
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK.
| | - Anne E Corcoran
- Nuclear Dynamics Programme, Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK.
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20
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Saintamand A, Rouaud P, Garot A, Saad F, Carrion C, Oblet C, Cogné M, Pinaud E, Denizot Y. The IgH 3' regulatory region governs μ chain transcription in mature B lymphocytes and the B cell fate. Oncotarget 2016; 6:4845-52. [PMID: 25742787 PMCID: PMC4467119 DOI: 10.18632/oncotarget.3010] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 12/21/2014] [Indexed: 12/11/2022] Open
Abstract
We report that the IgH 3' regulatory region (3'RR) has no role on μ chain transcription and pre-BCR expression in B cell progenitors. In contrast, analysis of heterozygous IgH aΔ3'RR/bwt mice indicated that the 3'RR controls μ chain transcripts in mature splenocytes and impacts membrane IgM density without obvious effect on BCR signals (colocalisation with lipid rafts and phosphorylation of Erk and Akt after BCR crosslinking). Deletion of the 3'RR modulates the B cell fate to less marginal zone B cells. In conclusion, the 3'RR is dispensable for pre-BCR expression and necessary for optimal commitments toward the marginal zone B cell fate. These results reinforce the concept of a dual regulation of the IgH locus transcription and accessibility by 5' elements at immature B cell stages, and by the 3'RR as early as the resting mature B cell stage and then along further activation and differentiation.
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Affiliation(s)
| | | | | | | | | | | | - Michel Cogné
- CNRS, CRIBL, UMR 7276, Limoges, France.,Université de Limoges, CRIBL, UMR 7276, Limoges, France.,Institut Universitaire de France, Paris, France
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21
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Saintamand A, Vincent-Fabert C, Garot A, Rouaud P, Oruc Z, Magnone V, Cogné M, Denizot Y. Deciphering the importance of the palindromic architecture of the immunoglobulin heavy-chain 3' regulatory region. Nat Commun 2016; 7:10730. [PMID: 26883548 PMCID: PMC4757795 DOI: 10.1038/ncomms10730] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 01/15/2016] [Indexed: 01/16/2023] Open
Abstract
The IgH 3' regulatory region (3'RR) controls class switch recombination (CSR) and somatic hypermutation (SHM) in B cells. The mouse 3'RR contains four enhancer elements with hs1,2 flanked by inverted repeated sequences and the centre of a 25-kb palindrome bounded by two hs3 enhancer inverted copies (hs3a and hs3b). hs4 lies downstream of the palindrome. In mammals, evolution maintained this unique palindromic arrangement, suggesting that it is functionally significant. Here we report that deconstructing the palindromic IgH 3'RR strongly affects its function even when enhancers are preserved. CSR and IgH transcription appear to be poorly dependent on the 3'RR architecture and it is more or less preserved, provided 3'RR enhancers are present. By contrast, a ‘palindromic effect' significantly lowers VH germline transcription, AID recruitment and SHM. In conclusion, this work indicates that the IgH 3'RR does not simply pile up enhancer units but also optimally exposes them into a functional architecture of crucial importance. The IgH 3' regulatory region contains an evolutionarily conserved palindromic sequence flanking important enhancer elements. Here the authors show that the palindrome is required for generating antibody diversity.
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Affiliation(s)
| | | | - Armand Garot
- Université de Limoges, CRIBL, UMR CNRS 7276, Limoges 87025, France
| | - Pauline Rouaud
- Université de Limoges, CRIBL, UMR CNRS 7276, Limoges 87025, France
| | - Zeliha Oruc
- Université de Limoges, CRIBL, UMR CNRS 7276, Limoges 87025, France
| | - Virginie Magnone
- CNRS et Université de Nice Sophia Antipolis, Institut de Pharmacologie Moléculaire et Cellulaire, UMR 6097, Sophia Antipolis 06560, France
| | - Michel Cogné
- Université de Limoges, CRIBL, UMR CNRS 7276, Limoges 87025, France.,Institut Universitaire de France, Paris 75231, France
| | - Yves Denizot
- Université de Limoges, CRIBL, UMR CNRS 7276, Limoges 87025, France
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22
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Sequential activation and distinct functions for distal and proximal modules within the IgH 3' regulatory region. Proc Natl Acad Sci U S A 2016; 113:1618-23. [PMID: 26831080 DOI: 10.1073/pnas.1514090113] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
As a master regulator of functional Ig heavy chain (IgH) expression, the IgH 3' regulatory region (3'RR) controls multiple transcription events at various stages of B-cell ontogeny, from newly formed B cells until the ultimate plasma cell stage. The IgH 3'RR plays a pivotal role in early B-cell receptor expression, germ-line transcription preceding class switch recombination, interactions between targeted switch (S) regions, variable region transcription before somatic hypermutation, and antibody heavy chain production, but the functional ranking of its different elements is still inaccurate, especially that of its evolutionarily conserved quasi-palindromic structure. By comparing relevant previous knockout (KO) mouse models (3'RR KO and hs3b-4 KO) to a novel mutant devoid of the 3'RR quasi-palindromic region (3'PAL KO), we pinpointed common features and differences that specify two distinct regulatory entities acting sequentially during B-cell ontogeny. Independently of exogenous antigens, the 3'RR distal part, including hs4, fine-tuned B-cell receptor expression in newly formed and naïve B-cell subsets. At mature stages, the 3'RR portion including the quasi-palindrome dictated antigen-dependent locus remodeling (global somatic hypermutation and class switch recombination to major isotypes) in activated B cells and antibody production in plasma cells.
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23
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Saad F, Saintamand A, Cogné M, Denizot Y. The IgH 3' regulatory region influences lymphomagenesis in Igλ-Myc mice. Oncotarget 2015; 6:20302-11. [PMID: 25980500 PMCID: PMC4653006 DOI: 10.18632/oncotarget.3963] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 04/10/2015] [Indexed: 01/11/2023] Open
Abstract
The IgH 3′regulatory region (3′RR), encompassing the four transcriptional enhancers hs3a-hs1,2-hs3b-hs4, has a key role on class switch recombination, somatic hypermutation, IgH transcription and B-cell fate. In plasma cells, transcribed IgH and IgL loci often colocalized in transcription factories and an IgL transcription defect might translate into lowered IgH transcription. We explored whether the 3′RR would affect lymphomagenesis in Igλ-Myc transgenic mice prone to lymphoproliferations. Breeding Igλ-Myc transgenics in a background deficient for the 3′RR influences lymphomagenesis toward less mature lymphomas (16% vs 54%, p = 0.01, Z test for two population proportions). In a 3′RR-deficient background mature tumors less often expressed the CD43 antigen (54% vs 0%, p = 0.02), a membrane glycoprotein expressed on activated mature B-cells. In contrast, in a 3′RR-deficient background tumors more often expressed the CD5 antigen (32% vs 12%, p = 0.05) that may serve to control autoimmunity and that is suspected to play a role in leukemic transformation. Lymphoma myc transcript levels, the Ki67 index of proliferation, the clonality, the usage of V(D)J segments, and their somatic hypermutation status were not affected in the 3′RR-deficient background. In conclusion, most probably through its action during the maturation process, the 3′RR can influence lymphomagenesis even when not linked with an oncogene.
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Affiliation(s)
- Faten Saad
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France
| | | | - Michel Cogné
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France
| | - Yves Denizot
- CNRS UMR 7276, CRIBL, Université de Limoges, Limoges, France
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24
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Developmental Switch in the Transcriptional Activity of a Long-Range Regulatory Element. Mol Cell Biol 2015. [PMID: 26195822 DOI: 10.1128/mcb.00509-15] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Eukaryotic gene expression is often controlled by distant regulatory elements. In developing B lymphocytes, transcription is associated with V(D)J recombination at immunoglobulin loci. This process is regulated by remote cis-acting elements. At the immunoglobulin heavy chain (IgH) locus, the 3' regulatory region (3'RR) promotes transcription in mature B cells. This led to the notion that the 3'RR orchestrates the IgH locus activity at late stages of B cell maturation only. However, long-range interactions involving the 3'RR were detected in early B cells, but the functional consequences of these interactions were unknown. Here we show that not only does the 3'RR affect transcription at distant sites within the IgH variable region but also it conveys a transcriptional silencing activity on both sense and antisense transcription. The 3'RR-mediated silencing activity is switched off upon completion of VH-DJH recombination. Our findings reveal a developmentally controlled, stage-dependent shift in the transcriptional activity of a master regulatory element.
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25
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Saintamand A, Rouaud P, Saad F, Rios G, Cogné M, Denizot Y. Elucidation of IgH 3′ region regulatory role during class switch recombination via germline deletion. Nat Commun 2015; 6:7084. [DOI: 10.1038/ncomms8084] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 04/01/2015] [Indexed: 02/06/2023] Open
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26
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Günal-Sadık G, Paszkowski-Rogacz M, Singaravelu K, Beyer A, Buchholz F, Jessberger R. Stage-specific binding profiles of cohesin in resting and activated B lymphocytes suggest a role for cohesin in immunoglobulin class switching and maturation. PLoS One 2014; 9:e111748. [PMID: 25375358 PMCID: PMC4222939 DOI: 10.1371/journal.pone.0111748] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 09/30/2014] [Indexed: 11/19/2022] Open
Abstract
The immunoglobulin heavy chain locus (Igh) features higher-order chromosomal interactions to facilitate stage-specific assembly of the Ig molecule. Cohesin, a ring-like protein complex required for sister chromatid cohesion, shapes chromosome architecture and chromatin interactions important for transcriptional regulation and often acts together with CTCF. Cohesin is likely involved in B cell activation and Ig class switch recombination. Hence, binding profiles of cohesin in resting mature murine splenic B lymphocytes and at two stages after cell activation were elucidated by chromatin immunoprecipitation and deep sequencing. Comparative genomic analysis revealed cohesin extensively changes its binding to transcriptional control elements after 48 h of stimulation with LPS/IL-4. Cohesin was clearly underrepresented at switch regions regardless of their activation status, suggesting that switch regions need to be cohesin-poor. Specific binding changes of cohesin at B-cell specific gene loci Pax5 and Blimp-1 indicate new cohesin-dependent regulatory pathways. Together with conserved cohesin/CTCF sites at the Igh 3'RR, a prominent cohesin/CTCF binding site was revealed near the 3' end of Cα where PolII localizes to 3' enhancers. Our study shows that cohesin likely regulates B cell activation and maturation, including Ig class switching.
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Affiliation(s)
- Gamze Günal-Sadık
- Institute of Physiological Chemistry, Faculty of Medicine Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Maciej Paszkowski-Rogacz
- Department of Medical Systems Biology, University Hospital and Medical Faculty Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Kalaimathy Singaravelu
- Cellular Networks and Systems Biology, Biotechnology Center, Dresden University of Technology, Dresden, Germany
| | - Andreas Beyer
- Cellular Networks and Systems Biology, Biotechnology Center, Dresden University of Technology, Dresden, Germany
- CECAD, Universität zu Köln, Köln, Germany
| | - Frank Buchholz
- Department of Medical Systems Biology, University Hospital and Medical Faculty Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Rolf Jessberger
- Institute of Physiological Chemistry, Faculty of Medicine Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
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27
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Targeting the oncogene B lymphoma deregulator IgH 3' regulatory region does not impede the in vivo inflammatory response in mice. Oncoscience 2014; 1:591-8. [PMID: 25594069 PMCID: PMC4278336 DOI: 10.18632/oncoscience.81] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 09/14/2014] [Indexed: 01/10/2023] Open
Abstract
The IgH 3′ regulatory region (3′RR), encompassing the four transcriptional enhancers hs3a-hs1,2-hs3b-hs4, is a potent lymphoma oncogene deregulator but its role in B cell-mediated inflammatory responses is unknown. We investigated the 3′RR involvement in the in vivo pristane-induced inflammatory response in BALB/c mice. The lack of the 3′RR in BALB/c mice had no wide effect on the incidence, the kinetic of development and the cellular composition of peritoneal ascites. Ascite pro-inflammatory cytokines levels (IL-6, IL-21, IL-12/23, TNF-α) were unchanged while anti-inflammatory cytokines levels (IL-10, interferon-γ) were slightly increased in 3′RR-deficient BALB/c mice as compared to wt BALB/c mice. In conclusion, the 3′RR is dispensable for the efficient recruitment of immune cells and the normal development of an inflammatory response in the in vivo pristane-induced inflammatory model. The 3′RR might be considered as a potential suitable target for anti-lymphoma pharmacological therapy without potent adverse effect on normal immune and inflammatory responses.
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28
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Marquet M, Garot A, Bender S, Carrion C, Rouaud P, Lecardeur S, Denizot Y, Cogné M, Pinaud E. The Eμ enhancer region influences H chain expression and B cell fate without impacting IgVH repertoire and immune response in vivo. THE JOURNAL OF IMMUNOLOGY 2014; 193:1171-83. [PMID: 24965776 DOI: 10.4049/jimmunol.1302868] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The IgH intronic enhancer region Eμ is a combination of both a 220-bp core enhancer element and two 310-350-bp flanking scaffold/matrix attachment regions named MARsEμ. In the mouse, deletion of the core-enhancer Eμ element mainly affects VDJ recombination with minor effects on class switch recombination. We carried out endogenous deletion of the full-length Eμ region (core plus MARsEμ) in the mouse genome to study VH gene repertoire and IgH expression in developing B-lineage cells. Despite a severe defect in VDJ recombination with partial blockade at the pro-B cell stage, Eμ deletion (core or full length) did not affect VH gene usage. Deletion of this regulatory region induced both a decrease of pre-B cell and newly formed B cell compartments and a strong orientation toward the marginal zone B cell subset. Because Igμ H chain expression was decreased in Eμ-deficient pre-B cells, we propose that modification of B cell homeostasis in deficient animals was caused by "weak" pre-B cell and BCR expression. Besides imbalances in B cell compartments, Ag-specific Ab responses were not impaired in animals carrying the Eμ deletion. In addition to its role in VDJ recombination, our study points out that the full-length Eμ region does not influence VH segment usage but ensures efficient Igμ-chain expression required for strong signaling through pre-B cells and newly formed BCRs and thus participates in B cell inflow and fate.
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Affiliation(s)
- Marie Marquet
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France
| | - Armand Garot
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France
| | - Sébastien Bender
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France; Centre Hospitalier Universitaire Dupuytren, Centre de Référence des Amyloses, 87042 Limoges, France; and
| | - Claire Carrion
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France
| | - Pauline Rouaud
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France
| | - Sandrine Lecardeur
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France
| | - Yves Denizot
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France
| | - Michel Cogné
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France; Institut Universitaire de France, 75005 Paris, France
| | - Eric Pinaud
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7276, Université de Limoges, 87025 Limoges, France;
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29
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Rouaud P, Saintamand A, Saad F, Carrion C, Lecardeur S, Cogné M, Denizot Y. Elucidation of the enigmatic IgD class-switch recombination via germline deletion of the IgH 3' regulatory region. ACTA ACUST UNITED AC 2014; 211:975-85. [PMID: 24752300 DOI: 10.1084/jem.20131385] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Classical class-switch recombination (cCSR) substitutes the Cμ gene with Cγ, Cε, or Cα, thereby generating IgG, IgE, or IgA classes, respectively. This activation-induced deaminase (AID)-driven process is controlled by the IgH 3' regulatory region (3'RR). Regulation of rare IgD CSR events has been enigmatic. We show that μδCSR occurs in mouse mesenteric lymph node (MLN) B cells and is AID-dependent. AID attacks differ from those in cCSR because they are not accompanied by extensive somatic hypermutation (SHM) of targeted regions and because repaired junctions exhibit features of the alternative end-joining (A-EJ) pathway. In contrast to cCSR and SHM, μδCSR is 3'RR-independent, as its absence affects neither breakpoint locations in Sμ- and Sδ-like (σ(δ)) nor mutation patterns at Sμ-σ(δ) junctions. Although mutations occur in the immediate proximity of the μδ junctions, SHM is absent distal to the junctions within both Sμ and rearranged VDJ regions. In conclusion, μδCSR is active in MLNs, occurs independently of 3'RR-driven assembly, and is even dramatically increased in 3'RR-deficient mice, further showing that its regulation differs from cCSR.
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Affiliation(s)
- Pauline Rouaud
- UMR CNRS 7276, Centre National de la Recherche Scientifique, Université de Limoges, 87025 Limoges, France
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30
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Birshtein BK. Epigenetic Regulation of Individual Modules of the immunoglobulin heavy chain locus 3' Regulatory Region. Front Immunol 2014; 5:163. [PMID: 24795714 PMCID: PMC4000994 DOI: 10.3389/fimmu.2014.00163] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Accepted: 03/27/2014] [Indexed: 11/18/2022] Open
Abstract
The Igh locus undergoes an amazing array of DNA rearrangements and modifications during B cell development. During early stages, the variable region gene is constructed from constituent variable (V), diversity (D), and joining (J) segments (VDJ joining). B cells that successfully express an antibody can be activated, leading to somatic hypermutation (SHM) focused on the variable region, and class switch recombination (CSR), which substitutes downstream constant region genes for the originally used Cμ constant region gene. Many investigators, ourselves included, have sought to understand how these processes specifically target the Igh locus and avoid other loci and potential deleterious consequences of malignant transformation. Our laboratory has concentrated on a complex regulatory region (RR) that is located downstream of Cα, the most 3′ of the Igh constant region genes. The ~40 kb 3′ RR, which is predicted to serve as a downstream major regulator of the Igh locus, contains two distinct segments: an ~28 kb region comprising four enhancers, and an adjacent ~12 kb region containing multiple CTCF and Pax5 binding sites. Analysis of targeted mutations in mice by a number of investigators has concluded that the entire 3′ RR enhancer region is essential for SHM and CSR (but not for VDJ joining) and for high levels of expression of multiple isotypes. The CTCF/Pax5 binding region is a candidate for influencing VDJ joining early in B cell development and serving as a potential insulator of the Igh locus. Components of the 3′ RR are subject to a variety of epigenetic changes during B cell development, i.e., DNAse I hypersensitivity, histone modifications, and DNA methylation, in association with transcription factor binding. I propose that these changes provide a foundation by which regulatory elements in modules of the 3′ RR function by interacting with each other and with target sequences of the Igh locus.
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Affiliation(s)
- Barbara K Birshtein
- Department of Cell Biology, Albert Einstein College of Medicine , Bronx, NY , USA
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Rouaud P, Vincent-Fabert C, Saintamand A, Fiancette R, Marquet M, Robert I, Reina-San-Martin B, Pinaud E, Cogné M, Denizot Y. The IgH 3' regulatory region controls somatic hypermutation in germinal center B cells. ACTA ACUST UNITED AC 2013; 210:1501-7. [PMID: 23825188 PMCID: PMC3727322 DOI: 10.1084/jem.20130072] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Somatic hypermutation in variable heavy chain rearranged regions is abrogated in the absence of the 3′ regulatory region enhancer, whereas transcription rate in the Ig heavy chain is only partially reduced. Interactions with cognate antigens recruit activated B cells into germinal centers where they undergo somatic hypermutation (SHM) in V(D)J exons for the generation of high-affinity antibodies. The contribution of IgH transcriptional enhancers in SHM is unclear. The Eμ enhancer upstream of Cμ has a marginal role, whereas the influence of the IgH 3′ regulatory region (3′RR) enhancers (hs3a, hs1,2, hs3b, and hs4) is controversial. To clarify the latter issue, we analyzed mice lacking the whole 30-kb extent of the IgH 3′RR. We show that SHM in VH rearranged regions is almost totally abrogated in 3′RR-deficient mice, whereas the simultaneous Ig heavy chain transcription rate is only partially reduced. In contrast, SHM in κ light chain genes remains unaltered, acquitting for any global SHM defect in our model. Beyond class switch recombination, the IgH 3′RR is a central element that controls heavy chain accessibility to activation-induced deaminase modifications including SHM.
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Affiliation(s)
- Pauline Rouaud
- Centre National de la Recherche Scientifique (CNRS) UMR 7276, Université de Limoges, 87025 Limoges, France
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Reynaud CA, Moutel S, Dieu-Nosjean MC, Laskov R, Teillaud JL. 1(st) French-Israeli International Conference on B Cells and therapeutic antibodies: October 23-25, 2011 Jerusalem, Israel. MAbs 2012; 4:426-33. [PMID: 22664457 PMCID: PMC3499337 DOI: 10.4161/mabs.20289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Claude-Agnès Reynaud
- INSERM U. 783, Paris Descartes University, Faculty of Medicine, Necker-Enfants Malades site, Paris, France
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