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Related Experiment Videos

Distinct clonal Ig diversification patterns in young appendix compared to antigen-specific splenic clones.

Devinder Sehgal1, Harold Obiakor, Rose G Mage

  • 1Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|May 23, 2002
PubMed
Summary

The rabbit appendix generates diverse B cell receptors early in life. This process, crucial for the immune system, differs from spleen responses and may be influenced by gut microbes.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Microbiology

Background:

  • The young rabbit appendix is a key site for primary B cell repertoire development.
  • Understanding B cell diversification during clonal expansion is crucial for immune system development.

Purpose of the Study:

  • To investigate diversification patterns during clonal expansion in the young rabbit appendix.
  • To compare appendix B cell diversification with splenic germinal center responses.

Main Methods:

  • Collection and sequencing of rearranged heavy (H) and light (L) chain genes from single appendix B cells (3-9 weeks old).
  • Isolation of single cells using hydraulic micromanipulation or laser capture microdissection.
  • Cell lysis, PCR amplification, and direct sequencing of amplified products.

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Main Results:

  • Gene conversion-like changes were observed in H and L chain sequences by 3-4 weeks of age.
  • Somatic mutations were detected in D regions and likely in V genes.
  • Clonally related appendix B cells showed diverse amino acid sequences in complementarity-determining regions (CDRs), including CDR3, unlike spleen clones.

Conclusions:

  • Appendix B cell diversification generates a wide variety of combining sites, suggesting a role in generating the preimmune repertoire.
  • Diversification patterns in the appendix differ significantly from antigen-driven splenic responses.
  • Microbial components may indirectly influence appendix B cell expansion and selection, rather than direct recognition as foreign antigens.