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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.
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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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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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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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AID in Antibody Diversification: There and Back Again.

Yuqing Feng1, Noé Seija2, Javier M Di Noia2

  • 1Department of Immunology, University of Toronto, Toronto, ON, Canada.

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Activation-Induced cytidine Deaminase (AID) drives antibody diversity by deaminating DNA, enabling somatic hypermutation and class switch recombination for pathogen clearance. This review covers AID

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Activation-Induced cytidine Deaminase (AID) is crucial for adaptive immunity, initiating antibody affinity maturation and isotype switching.
  • AID deaminates deoxycytidines in immunoglobulin genes, leading to somatic hypermutation (SHM) and class switch recombination (CSR).
  • Understanding AID's function is vital for comprehending humoral immune responses and potential therapeutic strategies.

Purpose of the Study:

  • To review the current understanding of Activation-Induced cytidine Deaminase (AID) function on its 20th anniversary.
  • To elucidate the biochemical mechanisms of AID, including its interplay with DNA repair pathways.
  • To discuss the regulatory mechanisms governing AID's genomic targeting and its distinct roles in mutagenesis versus gene sparing.

Main Methods:

  • Literature review and synthesis of existing research on AID.
  • Analysis of biochemical studies on AID activity and DNA repair.
  • Discussion of genetic and epigenetic factors influencing AID targeting and function.

Main Results:

  • AID utilizes error-free DNA repair pathways to prioritize mutagenesis over accuracy during antibody diversification.
  • The regulation of DNA double-strand break (DSB) repair pathways is critical during CSR.
  • Genomic targeting of AID is a complex, multilayered process involving chromatin, cis/trans-acting factors, and determining mutagenesis distinct from AID occupancy.

Conclusions:

  • AID's precise regulation ensures effective antibody diversification and pathogen clearance.
  • The interplay between AID and DNA repair mechanisms highlights a sophisticated strategy for immune adaptation.
  • Further research into AID regulation can inform strategies for autoimmune diseases and cancer therapies.