High-throughput immunoglobulin repertoire analysis distinguishes between human IgM memory and switched memory B-cell populations

• Published in: Blood Vol. 116; no. 7; pp. 1070 - 1078
• Main Authors: Wu, Yu-Chang, Kipling, David, Leong, Hui Sun, Martin, Victoria, Ademokun, Alexander A., Dunn-Walters, Deborah K.
• Format: Journal Article
• Language: English
• Published: Washington, DC Elsevier Inc 19.08.2010; Americain Society of Hematology; American Society of Hematology
• Series: Immunobiology
• Subjects: Adult; B-cell receptor; B-Lymphocytes - immunology; Biological and medical sciences; Blood; Cells, Cultured; Clonal selection; Gene Rearrangement; Germinal centers; Heavy chains; Hematologic and hematopoietic diseases; Humans; Immunobiology; Immunoglobulin D - genetics; Immunoglobulin D - immunology; Immunoglobulin M; Immunoglobulin M - genetics; Immunoglobulin M - immunology; Immunoglobulin Variable Region - genetics; Immunoglobulin Variable Region - immunology; Immunoglobulins; Immunologic Memory - physiology; Immunological memory; Leukocytes, Mononuclear; Lymphocytes B; Medical sciences; Memory cells; Polymerase Chain Reaction; somatic hypermutation; Tumor Necrosis Factor Receptor Superfamily, Member 7 - genetics; Tumor Necrosis Factor Receptor Superfamily, Member 7 - immunology; Young Adult; Human; Immunoglobulins; Hematology; B-Lymphocyte; Immunologic repertoire; IgM; Memory lymphocyte
• DOI: 10.1182/blood-2010-03-275859
• ISSN: 0006-4971; 1528-0020

B-cell receptor (BCR) diversity is achieved centrally by rearrangement of Variable, Diversity, and Joining genes, and peripherally by somatic hypermutation and class-switching of the rearranged genes. Peripheral B-cell populations are subject to both negative and positive selection events in the course of their development that have the potential to shape the BCR repertoire. The origin of IgM+IgD+CD27+ (IgM memory) cells is controversial. It has been suggested that they may be a prediversified, antigen-independent, population of cells or that they are a population of cells that develop in response to T-independent antigens. Most recently, it was suggested that the majority of IgM memory cells are directly related to switched memory cells and are early emigrants from the germinal center reaction. Advances in sequencing technology have enabled us to undertake large scale IGH repertoire analysis of transitional, naive, IgM memory and switched memory B-cell populations. We find that the memory B-cell repertoires differ from the transitional and naive repertoires, and that the IgM memory repertoire is distinct from that of class-switched memory. Thus we conclude that a large proportion of IgM memory cells develop in response to different stimuli than for class-switched memory cell development.