Review
Cell Biology
Amanda Bello, Gianna Hirth, Stefanie Voigt, Sandra Tepper, Berit Jungnickel
Summary: This review summarizes the mechanisms and regulation of somatic hypermutation and class switch recombination in B cells, as well as the specific targeting to immunoglobulin genes and mistargeting to other cellular genes.
Article
Biochemistry & Molecular Biology
Giovanna M. Bernal, Longtao Wu, David J. Voce, Ralph R. Weichselbaum, Bakhtiar Yamini
Summary: This study found that the p52 subunit increases in the nucleus of cells during senescence, and factors in the conditioned media play a role in promoting p52 nuclear translocation. Additionally, mature p52 can induce cellular senescence. These findings support the observation of increased p52 in aged tissue and suggest that p52 contributes to organismal aging.
CELL AND BIOSCIENCE
(2022)
Review
Immunology
Clara Young, Angelica W. Y. Lau, Deborah L. Burnett
Summary: Germinal centers play a crucial role in balancing self-tolerance and foreign binding, with the outcomes depending on factors such as affinity and avidity. If self-reactive B cells cannot be repaired through mutation, self-tolerance prevails and restricts the antibody response to the foreign pathogen.
FRONTIERS IN IMMUNOLOGY
(2022)
Article
Cell Biology
Wenfei Pan, Limei Deng, Haitao Wang, Vivien Ya-Fan Wang
Summary: The NF-kappa B family of dimeric transcription factors regulate various biological functions. A study has revealed that the atypical I kappa B protein, Bcl3, plays a crucial role in enhancing the population of the p52:p52 homodimer within the NF-kappa B family. Bcl3 competes with other NF-kappa B subunits for efficient p52:p52 homodimer formation, leading to the upregulation of target genes involved in cell proliferation, migration, and inflammation. The aberrant activation of Bcl3 and p52 contributes to cancer.
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Katrin Boettcher, Kerstin Braunschmidt, Gianna Hirth, Karsten Schaerich, Tilman E. Klassert, Magdalena Stock, Janine Sorgatz, Sabine Fischer-Burkart, Steffen Ullrich, Samantha Frankenberger, Daniel Kritsch, Christian Kosan, Ralf Kueppers, Lothar J. Strobl, Hortense Slevogt, Ursula Zimber-Strobl, Berit Jungnickel
Summary: p53 plays a crucial role in maintaining genome stability by regulating DNA repair and translesion synthesis. Mice lacking p53 show altered translesion polymerase-mediated mutagenesis, suggesting a potential role of p53 in non-B cells affecting B cell mutations. Inhibition of p53 leads to increased somatic hypermutation in human B lymphoma cells, indicating that loss of p53 function may promote genetic instability in vivo during antibody diversification.
MOLECULAR IMMUNOLOGY
(2021)
Article
Oncology
Meng Wu, Jing Zhang, Yi Wang, Lan Mi, Xiaopei Wang, Weiping Liu, Jie Fu, Haifeng Song, Yuqin Song, Jun Zhu
Summary: This study provides evidence that the presence of residual malignant B cells is connected to the clonal diversity of the resulting BCR repertoire. The study suggests that the growth rate of a patient's peripheral B cell diversity after stem cell transplant can be used as a prognostic indicator for relapse. The study also highlights the impact of tumor cells on the replenishment of the peripheral BCR immune repertoire.
Review
Cell Biology
Gourisankar Ghosh, Vivien Ya-Fan Wang
Summary: The NF-kappa B family transcription factors, consisting of five monomers, play a critical role in regulating biological programs through DNA binding and transcriptional activation, despite their sequence and functional similarities, each member of the family displays distinct activities.
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
(2021)
Article
Immunology
Jana Koers, Casper Marsman, Juulke Steuten, Simon Tol, Ninotska I. L. Derksen, Anja ten Brinke, S. Marieke van Ham, Theo Rispens
Summary: In this study, the researchers used optimized in vitro culture conditions and in-depth assessment of B cell characteristics and signaling pathways to investigate the role of oxygen in regulating human naive B cell differentiation and class switch recombination. They found that normoxia promotes differentiation into functional antibody secreting cells, while a unique population of CD27(++) B cells is generated under hypoxia. Additionally, time-dependent transitions between hypoxic and normoxic oxygen levels during culture can direct different trajectories of human B cell differentiation and IgG class switch recombination.
FRONTIERS IN IMMUNOLOGY
(2022)
Article
Multidisciplinary Sciences
Liat Stoler-Barak, Ethan Harris, Ayelet Peres, Hadas Hezroni, Mirela Kuka, Pietro Di Lucia, Amalie Grenov, Neta Gurwicz, Meital Kupervaser, Bon Ham Yip, Matteo Iannacone, Gur Yaari, John D. Crispino, Ziv Shulman
Summary: The protein kinase DYRK1A is essential for B cell-mediated protection from viral infection and effective vaccination by regulating class switch recombination (CSR). It plays a crucial role in B cell immune responses, including attenuating B cell proliferation and promoting the production of pathogen-eliminating antibodies.
NATURE COMMUNICATIONS
(2023)
Review
Biochemistry & Molecular Biology
Kefei Yu
Summary: This mini review discusses recent advances in understanding the function and regulation of AID in B cells, including its molecular structure, advances in high throughput techniques, and the mechanism of AID-mediated class switch recombination. These studies have provided insights into the biochemical properties and function of AID.
ACTA BIOCHIMICA ET BIOPHYSICA SINICA
(2022)
Article
Immunology
Doaa Waly, Aradana Muthupandian, Chia-Wei Fan, Harrison Anzinger, Brad G. G. Magor
Summary: This study reveals the existence of Aicda(+) cell clusters in fish that functionally resemble germinal centers in mammals. These clusters undergo B-cell clonal expansion and VDJ somatic hypermutation to achieve antibody affinity maturation. The study also provides evidence for positive selection for replacement mutations in regions encoding the antigen contact loops, leading to functional antibody modification. Additionally, melano-macrophages in the clusters trap antigens used for post-mutation B-cell selection, serving a role similar to follicular dendritic cells in mammalian germinal centers.
FRONTIERS IN IMMUNOLOGY
(2022)
Review
Immunology
Domenick E. Kennedy, Marcus R. Clark
Summary: Recent advancements have shed new light on the coordinated development of high affinity antibody responses through germinal centers (GCs), highlighting the importance of distinct cell states in GC B cell function, selection, proliferation, and somatic hypermutation (SHM). This new model presents opportunities for understanding the evolution of immunity in infectious, autoimmune, and neoplastic diseases.
FRONTIERS IN IMMUNOLOGY
(2021)
Article
Biology
Nicholas Sim, Yinghui Li
Summary: p52-induced ETS1 overexpression in glioma cells remodels the genome-wide regulatory network of p52 and ETS1 to transcriptionally drive cancer progression. Chronic inflammation promotes glioma progression by activating NF-kappa B signalling, which promotes cancer cell invasion and angiogenesis. Non-canonical NF-kappa B activation directly regulates p52 at the ETS1 promoter, leading to its overexpression and impacting the genomic landscape of ETS1 in a glioma-specific manner.
COMMUNICATIONS BIOLOGY
(2023)
Article
Immunology
Morgane Thomas, Charlotte Bruzeau, Ophelie Alyssa Martin, Justine Pollet, Sebastien Bender, Claire Carrion, Sandrine Le Noir, Eric Pinaud
Summary: SATB1 is a cell type-specific factor that plays an essential role in the genetic network of developing T cells and neurons. However, its involvement in B-cell differentiation needs further clarification. Our study using a SATB1 knockout mouse model reveals that SATB1 is dispensable for B-cell development and the establishment of a broad IgH repertoire. We also find that SATB1 has a dual function in mature B cells, acting as a positive regulator in naive cells and a negative regulator in activated cells.
CELLULAR & MOLECULAR IMMUNOLOGY
(2023)
Article
Immunology
Qian Hao, Chuanzong Zhan, Chaoyang Lian, Simin Luo, Wenyi Cao, Binbin Wang, Xia Xie, Xiaofei Ye, Tuantuan Gui, Claudia Voena, Chiara Pighi, Yanyan Wang, Ying Tian, Xin Wang, Pengfei Dai, Yanni Cai, Xiaojing Liu, Shengqun Ouyang, Shiqi Sun, Qianwen Hu, Jun Liu, Youqiong Ye, Jingkun Zhao, Aiguo Lu, Ji-Yang Wang, Chuanxin Huang, Bing Su, Fei-Long Meng, Roberto Chiarle, Qiang Pan-Hammarstrom, Leng-Siew Yeap
Summary: Insertions and deletions (indels) are low-frequency deleterious genomic DNA alterations, and indels leading to long CDR3 are crucial for antibody functions. The mechanism that generates indels during immunoglobulin diversification remains poorly understood. Through deep profiling of indels in mouse models, the study unveils the prevalent +/- 1-bp indels that bias deleterious outcomes and the rare longer in-frame indels. The research also reveals the involvement of DNA repair and processing factors in indel generation and suggests potential strategies for generating antibodies with long CDR3.
SCIENCE IMMUNOLOGY
(2023)