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B-cell development in the amphibian Xenopus.

L Du Pasquier1, J Robert, M Courtet

  • 1Basel Institute for Immunology, Switzerland. dupasquier@dial.eunet.ch

Immunological Reviews
|August 10, 2000
PubMed
Summary

Xenopus and mammals share immunoglobulin gene organization, but Xenopus B-cell development is faster and less diverse due to developmental pressures and simpler lymphoid structures, impacting immune response heterogeneity.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Comparative Genomics

Background:

  • Mammalian and amphibian immunoglobulin gene loci share organizational similarities, including V(D)J recombination.
  • Significant differences exist in B-cell development kinetics, cell numbers, and lymphoid organ architecture between Xenopus and mammals.

Purpose of the Study:

  • To investigate the distinct features of B-cell development and immune diversification in Xenopus compared to mammals.
  • To understand the genetic and developmental factors influencing immune repertoire heterogeneity in Xenopus.

Main Methods:

  • Comparative analysis of immunoglobulin gene loci organization and usage.
  • Examination of B-cell development kinetics and lymphoid organ architecture in Xenopus.
  • Analysis of immune response heterogeneity, including N diversity and somatic mutation selection.

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Main Results:

  • Xenopus B-cell development is rapid and genetically pre-programmed, with limited clonal amplification and N-diversity in larval rearrangements.
  • V(H) gene utilization in Xenopus appears family-based, influenced by DNA structure rather than locus position.
  • Somatic mutants are generated but poorly selected in Xenopus due to simpler lymphoid organs, leading to reduced affinity maturation.
  • Isotype switching in Xenopus involves A-T rich switch regions with conserved microsites, differing from mammalian counterparts.

Conclusions:

  • Developmental kinetics, cell numbers, and lymphoid organ architecture are key determinants of B-cell development differences between Xenopus and mammals.
  • Xenopus exhibits a unique, genetically controlled immune diversification strategy shaped by early developmental pressures and metamorphosis.
  • The simpler Xenopus immune system results in distinct larval and adult immune responses with limited affinity maturation compared to mammals.