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Related Concept Videos

B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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...
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T Cell Activation and Clonal Selection01:22

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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.
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Cells of the Adaptive Immune Response01:23

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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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Hybridoma technology is used for the large-scale production of monoclonal antibodies. Monoclonal antibodies bind to only a single antigenic determinant or epitope. Such antibodies are used in research, diagnostics, and disease therapy. The hybridoma technology established in 1975 by Georges Köhler and Cesar Milstein was awarded the Nobel Prize in Medicine in 1984 for revolutionizing research and therapy.
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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.
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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.
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Related Experiment Video

Updated: Apr 30, 2026

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma
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Reconstructing a B-Cell Clonal Lineage. II. Mutation, Selection, and Affinity Maturation.

Thomas B Kepler1, Supriya Munshaw2, Kevin Wiehe3

  • 1Department of Microbiology, Boston University School of Medicine , Boston, MA , USA ; Department of Mathematics and Statistics, Boston University , Boston, MA , USA.

Frontiers in Immunology
|May 6, 2014
PubMed
Summary
This summary is machine-generated.

Antibody affinity maturation, a key immune response, involves B-cell mutations and selection. This study shows mutation patterns and selection align, significantly boosting antibody effectiveness against influenza hemagglutinin.

Keywords:
antibody affinity maturationantibody selectionexperimental influenza infectionphylogeneticssomatic hypermutation

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Antibody affinity maturation is crucial for adaptive immunity, involving B-cell proliferation and immunoglobulin (Ig) gene mutations.
  • Somatic hypermutation rates are influenced by local DNA sequence and region-specific codon biases in Ig genes.
  • These biases lead to differential mutability, particularly in antigen-binding domains.

Purpose of the Study:

  • To investigate the relationship between mutation bias and selection during antibody affinity maturation.
  • To quantify the improvement in antibody affinity to influenza hemagglutinin (HA) over evolutionary time.
  • To determine if selection and mutation bias are concordant during maturation to a specific antigen.

Main Methods:

  • Isolated clonally related natural Ig heavy and light chain pairs from an influenza patient.
  • Inferred unmutated ancestral rearrangements and maturation intermediates.
  • Synthesized antibodies using recombinant methods for functional analysis.

Main Results:

  • Observed a uniform 1000-fold increase in effective affinity to HA from ancestor to mature antibodies.
  • Demonstrated concordance between selection and mutation bias at the level of single-antigen maturation.
  • Showed substantial affinity improvement occurred along mutationally preferred sequence paths.

Conclusions:

  • Local codon biases facilitate antibody affinity maturation by guiding mutations along favorable paths.
  • The findings provide insights into the mechanisms driving the evolution of high-affinity antibodies.
  • Understanding these processes can inform vaccine development and immunotherapy strategies.