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Related Concept Videos

B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Affinity and Avidity01:41

Affinity and Avidity

Overview
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...

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Related Experiment Video

Updated: May 23, 2026

Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
09:35

Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches

Published on: April 20, 2021

Affinity-based selection and the germinal center response.

Tyani D Chan1, Robert Brink

  • 1Immunology Research Program, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia.

Immunological Reviews
|April 17, 2012
PubMed
Summary
This summary is machine-generated.

B-cell antigen receptor (BCR) diversity is generated through gene rearrangement and somatic hypermutation (SHM). Affinity for foreign antigens guides B-cell selection in germinal centers (GCs), but SHM risks creating self-reactive cells.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • B-cell antigen receptors (BCRs) exhibit unparalleled diversity due to unique immunoglobulin (Ig) gene rearrangements.
  • Further diversification occurs via somatic hypermutation (SHM) in germinal centers (GCs) after antigen activation.

Purpose of the Study:

  • To review the role of antigen affinity/avidity in B-cell development and GC responses.
  • To examine the emergence of self-reactivity during the GC response and its implications.

Main Methods:

  • Review of existing literature on BCR-ligand interactions.
  • Analysis of B-cell gene rearrangement and SHM processes.
  • Examination of affinity-based selection mechanisms in GCs.

Main Results:

  • BCR affinity for foreign antigens is critical for B-cell survival and differentiation in GCs.
  • SHM diversifies BCRs but can lead to self-reactivity and autoantibody production.
  • Cross-reactive GC B cells pose a threat by binding both self and foreign antigens.

Conclusions:

  • Antigen affinity is a key regulator of B-cell fate during immune responses.
  • Mechanisms controlling BCR self-reactivity are crucial for preventing autoimmunity.
  • Understanding BCR dynamics in GCs is vital for immune health and disease research.