Cited by 81T-cell and B-cell ImmunologyGenomics and Chromatin DynamicsLymphoma Diagnosis and Treatment

Transcription Factors IRF8 and PU.1 Are Required for Follicular B Cell Development and BCL6‐driven Germinal Center Responses

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Wang, Hongsheng, Jain, Shweta, Li, Peng, Lin, Jian-Xin, Oh, Jangsuk, Qi, Chenfeng, Gao, Yuanyuan, Sun, Jiafang +8 more·2019·Proceedings of the National Academy of Sciences

Abstract

The IRF and Ets families of transcription factors regulate the expression of a range of genes involved in immune cell development and function. However, the understanding of the molecular mechanisms of each family member has been limited due to their redundancy and broad effects on multiple lineages of cells. Here, we report that double deletion of floxed Irf8 and Spi1 (encoding PU.1) by Mb1-Cre (designated DKO mice) in the B cell lineage resulted in severe defects in the development of follicular and germinal center (GC) B cells. Class-switch recombination and antibody affinity maturation were also compromised in DKO mice. RNA-seq (sequencing) and ChIP-seq analyses revealed distinct IRF8 and PU.1 target genes in follicular and activated B cells. DKO B cells had diminished expression of target genes vital for maintaining follicular B cell identity and GC development. Moreover, our findings reveal that expression of B-cell lymphoma protein 6 (BCL6), which is critical for development of germinal center B cells, is dependent on IRF8 and PU.1 in vivo, providing a mechanism for the critical role for IRF8 and PU.1 in the development of GC B cells.

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Crossref · 10.1073/pnas.1901258116

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  • PU.1 functions as a pioneer transcriptional factor that establishes enhancer accessibility in myeloid lineage cells and directly induces expression of other transcriptional factors, such as IRF8 and MEF2C.

    “Especially, PU.1 functions as a pioneer transcriptional factor that establishes enhancer accessibility in myeloid lineage cells and directly induces expression of other transcriptional factors (e.g., IRF8, MEF2C) [29, 64, 69, 70].”

    From Targeting Microglial Transcriptional Reprogramming as a Therapy Strategy for Alzheimer's Disease (2026) · cites this paper as [69]

    In “Disrupted Germinal Center Responses in DKO Mice” (page unavailable), the paper identifies Mef2c as a direct target of IRF8 and PU.1 in follicular B cells. It does not establish that PU.1 acts as a pioneer factor to open enhancers in myeloid cells or that it directly induces IRF8 expression. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Authors
Wang, H., Jain, S., Li, P., Lin, J.-X., Oh, J., Qi, C., Gao, Y., Sun, J., Sakai, T., Naghashfar, Z., Abbasi, S., Kovalchuk, A. L., Bolland, S., Nutt, S. L., Leonard, W. J., & Morse, H. C.
Affiliations
  • National Institutes of Health (US)
  • Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852;
  • The University of Melbourne (AU)
Venue
Proceedings of the National Academy of Sciences
Published
2019-04-18
Volume
116
Issue
19
Pages
9511-9520
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2937775576
Cited by
81
References
76
Citations by year
2026: 14 · 2025: 10 · 2024: 11 · 2023: 11 · 2022: 9 · 2021: 10 · 2020: 11 · 2019: 5
FWCI
3.50
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • Medical Research Council
  • National Health and Medical Research Council (1054925, 1058238, 1054925, 1058238)
  • National Heart, Lung, and Blood Institute
  • National Institute of Allergy and Infectious Diseases
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Lymphoma Diagnosis and Treatment
Keywords
IRF8, PU.1, follicular B cells, germinal center, BCL6, class switch recombination, affinity maturation, transcription factor target genes, B cell development
MeSH terms
Interferon Regulatory Factor-8, Proto-Oncogene Protein Spi-1, Animals, B-Lymphocytes, Lymphocyte Activation, Proto-Oncogene Proteins, Trans-Activators, Immunoglobulin Class Switching, Mice, Knockout, Germinal Center, Interferon Regulatory Factors, Mice, Proto-Oncogene Proteins c-bcl-6

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