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Related Experiment Videos

Novel insight into antibody diversification from cattle.

A Kaushik1, F Shojaei, S S Saini

  • 1Department of Pathobiology, University of Guelph, Guelph, Ont., Canada N1G 2W1. akaushik@uoguelph.ca

Veterinary Immunology and Immunopathology
|June 20, 2002
PubMed
Summary

Cattle generate diverse antibodies without maternal antibodies by creating exceptionally long CDR3H regions in IgM. This unique antibody diversification strategy complements limited germline sequences and somatic mutations.

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Area of Science:

  • Immunology
  • Veterinary Science
  • Molecular Biology

Background:

  • The bovine immune system develops without maternal antibodies due to a syndesmochorial placenta.
  • Limited germline diversity at heavy and light chain loci restricts antibody combinatorial diversity in cattle.

Purpose of the Study:

  • To investigate the antibody diversification strategies employed by cattle in the absence of maternal antibody influence.
  • To understand how cattle achieve a broad antibody repertoire despite genetic constraints.

Main Methods:

  • Analysis of VDJ rearrangements in adult cattle.
  • Characterization of antibody molecular structures, focusing on CDR3H regions.
  • Functional assessment of antibodies recognizing diverse antigens.

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Main Results:

  • Identification of large IgM antibody molecules with exceptionally long CDR3H regions (up to 61 amino acids).
  • Demonstration that these elongated CDR3H IgM antibodies are functional and can recognize structurally dissimilar antigens.
  • Evidence that antibody diversification in cattle involves both long CDR3H generation and somatic hypermutation.

Conclusions:

  • Cattle utilize exceptionally long CDR3H regions as a key mechanism for antibody diversification.
  • This strategy compensates for limited germline diversity and the absence of maternal antibody priming.
  • The bovine antibody repertoire is shaped by unique structural adaptations in IgM antibodies.