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Related Concept Videos

Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
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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.
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,...
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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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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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Diversity of Antigen Receptors01:28

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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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Isolation and Ex Vivo Culture of V&#948;1+CD4+&#947;&#948; T Cells, an Extrathymic &#945;&#946;T-cell Progenitor
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Origin and evolution of adaptive immunity.

Thomas Boehm1, Jeremy B Swann

  • 1Max Planck Institute of Immunobiology and Epigenetics, 79108 Freiburg, Germany; email: boehm@immunbio.mpg.de , swann@immunbio.mpg.de.

Annual Review of Animal Biosciences
|November 11, 2014
PubMed
Summary
This summary is machine-generated.

The evolution of vertebrates involved a complex immune system with B- and T-like cells. However, the mechanisms for diversifying antigen receptors likely evolved later, with memory formation appearing convergently across diverse organisms.

Keywords:
antigen receptorlymphocytelymphoid organsomatic diversification

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Area of Science:

  • Evolutionary biology
  • Immunology
  • Comparative genomics

Background:

  • Vertebrate adaptive immunity relies on lymphocyte antigen receptors.
  • Jawless and jawed vertebrates utilize distinct antigen receptor systems.
  • This suggests a shared, yet divergent, evolutionary path for immune systems.

Purpose of the Study:

  • To investigate the evolutionary origins of the vertebrate adaptive immune system.
  • To understand the ancestral state of lymphocyte lineages and immune organs.
  • To explore the evolution of somatic diversification mechanisms and memory formation.

Main Methods:

  • Comparative analysis of immune system components across vertebrate lineages.
  • Phylogenetic reconstruction of immune gene evolution.
  • Examination of immune memory in both innate and adaptive responses.

Main Results:

  • The common vertebrate ancestor likely possessed B- and T-like lymphocytes and primary lymphoid organs (e.g., thymus).
  • Somatic diversification mechanisms for antigen receptors were likely acquired after the divergence of jawless and jawed vertebrates.
  • Immune memory is not exclusive to adaptive immunity and shows convergent evolution in innate immunity and even unicellular organisms.

Conclusions:

  • The fundamental architecture of the vertebrate adaptive immune system predates specialized somatic diversification.
  • Convergent evolution played a significant role in shaping immune memory and other adaptive immunity features.
  • Understanding these evolutionary pathways provides insights into the development and function of modern immune systems.