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Analysis of junctional diversity during B lymphocyte development.

K Meek1

  • 1Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235.

Science (New York, N.Y.)
|November 9, 1990
PubMed
Summary

Antibody diversity is shaped by nucleotide changes during gene recombination. Fetal B cells have limited antibody repertoires due to fewer added nucleotides compared to adult B cells.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Antibody diversity is crucial for adaptive immunity.
  • Immunoglobulin (IG) gene rearrangement generates this diversity through V(D)J recombination.
  • Junctional modifications during recombination influence the antibody repertoire.

Purpose of the Study:

  • To investigate the developmental differences in junctional modifications during immunoglobulin gene rearrangement.
  • To understand how these modifications impact the fetal and adult antibody repertoire.
  • To examine the reading frame bias in murine immunoglobulin heavy chain gene assembly.

Main Methods:

  • Analysis of junctional modifications in fetal and adult B cells.
  • Quantification of nucleotide addition and deletion at coding joints.
  • Examination of DNA sequences at the DHJH intermediate.

Main Results:

  • Nongermline-encoded nucleotide addition is more frequent in adult B cells than fetal B cells.
  • Nucleotide deletion occurs at similar rates in B cells across different developmental stages.
  • A bias for a specific DH segment reading frame is observed at the DHJH intermediate in mice.

Conclusions:

  • Junctional modifications, particularly nucleotide addition, contribute to repertoire limitation in fetal B cells.
  • Developmental stage influences the extent of junctional modifications, impacting antibody diversity.
  • Understanding these processes is key to comprehending adaptive immune system development.

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