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Related Experiment Videos

Targeting and selection of mutations in human Vlambda rearrangements.

N L Monson1, T Dörner, P E Lipsky

  • 1Department of Internal Medicine and Harold C. Simmons Arthritis Research Center, University of Texas Southwestern Medical Center at Dallas, USA.

European Journal of Immunology
|July 18, 2000
PubMed
Summary

Somatic hypermutation impacts B cell receptor diversity. Mutations target specific DNA motifs, particularly in the complementarity-determining region, influencing B cell repertoire development.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Somatic hypermutation (SHM) is a key process shaping the antibody repertoire.
  • Understanding SHM in B cells with and without selection is crucial for B cell development.

Purpose of the Study:

  • To analyze the impact of SHM on the lambda light chain repertoire of individual IgM+ peripheral B cells.
  • To compare mutation patterns in nonproductive and productive VlambdaJlambda rearrangements under selective pressures.

Main Methods:

  • Analysis of VlambdaJlambda rearrangements from individual peripheral B cells.
  • Quantification of mutational frequency in complementarity-determining regions (CDR) and framework regions (FR).
  • Identification of mutation hotspots and targeted motifs (RGYW/WRCY).

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Main Results:

  • Higher mutation frequency in CDR compared to FR for nonproductive rearrangements.
  • Significantly greater mutations in both CDR and FR for productive rearrangements.
  • Targeting of mutations to RGYW/WRCY motifs, with positive selection observed in productive rearrangements.

Conclusions:

  • Mutation targeting and selection in specific motifs significantly influence nucleotide changes in VlambdaJlambda rearrangements.
  • SHM machinery and selection processes are critical for shaping the B cell repertoire.
  • These findings provide insights into the mechanisms governing antibody diversity.