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B Cell Activation and Differentiation01:24

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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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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 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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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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Flow Cytometric Characterization of Murine B Cell Development
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Quantifying evolutionary constraints on B-cell affinity maturation.

Connor O McCoy1, Trevor Bedford2, Vladimir N Minin3

  • 1Computational Biology, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|July 22, 2015
PubMed
Summary

The human antibody repertoire evolves through B-cell receptor (BCR) mutation and selection. New statistical methods reveal conserved mutation patterns across individuals but highlight gene-specific variations and precise selection pressures on BCRs.

Keywords:
B cellaffinity maturationantibodyimmunoglobulinmolecular evolutionnatural selection

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Area of Science:

  • Immunology
  • Molecular Evolution
  • Bioinformatics

Background:

  • The antibody repertoire is shaped by B-cell receptor (BCR) mutation and selection.
  • High-throughput sequencing now allows detailed analysis of this evolutionary process.

Purpose of the Study:

  • To develop and apply advanced statistical methods for analyzing B-cell sequence data.
  • To investigate evolutionary constraints and selection pressures on BCRs.

Main Methods:

  • Application of modern statistical molecular evolution techniques.
  • Analysis of a deep short-read dataset of BCR sequences.
  • Development of a novel method using stochastic mapping and empirical Bayes estimators to differentiate selection from mutation, by comparing in-frame and out-of-frame rearrangements.

Main Results:

  • The BCR substitution process is conserved among individuals but varies significantly across different gene segments.
  • A per-residue map of selection on BCRs was derived, offering a detailed view of constraints on framework and variable regions.

Conclusions:

  • Statistical molecular evolution methods provide powerful insights into BCR repertoire dynamics.
  • Selection pressures on BCRs are complex, varying by gene segment and residue position.