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Related Experiment Videos

Evolution of isotype switching.

Janet Stavnezer1, Chris T Amemiya

  • 1Department of Molecular Genetics and Microbiology, Program in Immunology and Virology, University of Massachusetts Medical School, 55 Lake Ave N, Worcester, MA 01655-0122, USA. janet.stavnezer@umassmed.edu

Seminars in Immunology
|November 4, 2004
PubMed
Summary
This summary is machine-generated.

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The evolution of immunoglobulin (Ig) class switch recombination (CSR) is linked to somatic hypermutation (SHM). While activation-induced cytidine deaminase (AID) is present in fish, CSR likely emerged later in amphibians.

Area of Science:

  • Immunology
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Immunoglobulin (Ig) class switch recombination (CSR) and somatic hypermutation (SHM) are crucial adaptive immune processes.
  • The evolution of these mechanisms provides insight into the development of antibody diversity and function.

Purpose of the Study:

  • To review the evolutionary trajectory of Ig heavy chain class switching.
  • To correlate the emergence of CSR with the appearance of SHM.
  • To examine the mechanisms of Ig heavy chain isotype expression across vertebrates.

Main Methods:

  • Comparative analysis of molecular mechanisms of CSR and SHM.
  • Review of genetic and protein expression data across diverse vertebrate species.
  • Tracing the evolutionary history of key enzymes like activation-induced cytidine deaminase (AID).

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Main Results:

  • Activation-induced cytidine deaminase (AID), essential for CSR and SHM, is present in fish.
  • While fish may undergo SHM, CSR is unlikely in this group.
  • CSR appears to have first emerged in amphibians, with distinct evolutionary paths in birds and mammals.

Conclusions:

  • The evolution of CSR is a stepwise process, with AID predating the full CSR mechanism.
  • Understanding the evolutionary timeline of CSR and SHM illuminates the development of adaptive immunity.
  • Comparative studies across species are vital for deciphering the origins of complex immunological processes.