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Related Experiment Videos

Immunoproteins in evolution.

J J Marchalonis1, S F Schluter

  • 1University Department of Microbiology and Immunology, University of Arizona, Tucson 85724.

Developmental and Comparative Immunology
|January 1, 1989
PubMed
Summary

This study explores the evolution of immune system genes in vertebrates, finding that joining (J) gene segments are highly conserved, crucial for immunoglobulin gene formation. Variable (V) regions are also conserved, while constant (C) regions show less conservation across species.

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Area of Science:

  • Evolutionary immunology
  • Comparative genomics
  • Molecular evolution

Background:

  • Vertebrates possess ancient recognition molecules like C-reactive protein (CRP) alongside adaptive immune components.
  • Immunoglobulins (Igs) and T cell receptors (TCRs) are key to adaptive immunity, with their diversity generated through gene rearrangement.
  • Understanding the evolutionary conservation of Ig and TCR gene segments provides insights into immune system development.

Purpose of the Study:

  • To investigate the evolutionary conservation of immunoglobulin (Ig) and T cell receptor (TCR) gene segments across vertebrate species.
  • To analyze the role of gene rearrangement in the generation of antibody diversity throughout vertebrate evolution.
  • To compare the conservation patterns of variable (V), joining (J), and constant (C) gene regions in Ig and TCRs.

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Main Methods:

  • Utilized antibodies against synthetic joining region peptides to study rearranging Igs in evolution.
  • Employed recombinant DNA technology to examine T cell receptor V beta genes in a goldfish genomic library.
  • Isolated and characterized a gene fragment encoding the sandbar shark light chain C region.

Main Results:

  • Joining (J) region segments demonstrate the highest evolutionary conservation, essential for Ig gene formation via rearrangement.
  • Framework segments of variable (V) regions are highly conserved in both TCRs and Igs across vertebrate evolution.
  • Constant (C) region segments of light chains in lower vertebrates are homologous to mammalian counterparts, but show less phylogenetic conservation than V regions.

Conclusions:

  • J region segments are critical for Ig gene assembly, explaining their high conservation.
  • V region framework segments are conserved due to functional constraints in antigen recognition for both Igs and TCRs.
  • Phylogenetic trees can be constructed using C region sequences, but not reliably using V regions, due to differing evolutionary pressures.