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Related Experiment Videos

Gene conversion contributes to Ig light chain diversity in cattle

C L Parng1, S Hansal, R A Goldsby

  • 1Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst 01003, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|December 15, 1996
PubMed
Summary

Cattle diversify their primary antibody light chain repertoire through limited gene rearrangement and gene conversion, unlike humans and mice. This unique mechanism involves a high proportion of pseudogenes and a single joining gene segment.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • In humans and mice, extensive gene rearrangement diversifies the primary immunoglobulin (Ig) repertoire.
  • The mechanisms governing antibody repertoire diversification can vary significantly across species.

Purpose of the Study:

  • To investigate the mechanisms of light chain gene diversification in cattle.
  • To compare cattle antibody gene diversification with established patterns in humans and mice.

Main Methods:

  • Sequencing of germ-line and expressed Vlambda genes from cattle.
  • Analysis of Vlambda cDNA from ileal Peyer's patch B cells.
  • Identification and characterization of Vlambda pseudogenes and their role in diversification.

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Main Results:

  • Cattle exhibit sharply limited rearrangement in the light chain locus.
  • A significant proportion (70%) of identified germ-line Vlambda genes are pseudogenes due to various defects.
  • The light chain repertoire arises from a small number of V(J) rearrangements, utilizing only a single joining gene segment.
  • Gene conversion, involving pseudogene sequences, contributes significantly to Vlambda repertoire diversification.
  • Somatic mutation plays a role, but V gene rearrangement is not a major factor in cattle lambda diversification.

Conclusions:

  • Cattle employ a distinct strategy for primary lambda repertoire diversification, differing from humans and mice.
  • Limited V(J) rearrangement, extensive pseudogenization, and gene conversion are key features of cattle light chain diversification.
  • Gene conversion, rather than extensive V gene rearrangement, is crucial for expanding the functional antibody repertoire in cattle.