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Related Experiment Videos

Various V-J rearrangement efficiencies shape the mouse lambda B cell repertoire

P Boudinot1, D Rueff-Juy, A M Drapier

  • 1Département d'Immunologie, Institut Pasteur (URA CNRS 1961), Paris, France.

European Journal of Immunology
|September 1, 1995
PubMed
Summary

The lambda light chain repertoire in C kappa knockout mice is dominated by lambda 1 due to a high probability of V1-J1 rearrangement and low probability of productive V1J3 junctions, influencing B cell diversity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • B cell repertoire diversity is crucial for adaptive immunity.
  • C kappa knockout mice exhibit limited B cell diversity due to reliance on lambda light chains.
  • Four lambda light chain subtypes (lambda 1, 2, 3) exist, with varying expression levels in spleen B cells.

Purpose of the Study:

  • To investigate the mechanistic pressures influencing lambda light chain subtype distribution.
  • To analyze the impact of V lambda J lambda rearrangements on B cell differentiation and subtype expression.
  • To understand the genetic basis for the dominance of lambda 1 and under-expression of lambda 3.

Main Methods:

  • Analysis of lambda rearrangement proportions in B cell subpopulations.

Related Experiment Videos

  • Sequencing of V lambda J lambda junction sequences at different B cell differentiation stages (pre-B, immature, mature).
  • Comparison of productive and non-productive VJ junction ratios across lambda subtypes.

    • Main Results:

    • The ratio of productive/non-productive VJ junctions is dependent on the specific lambda segments rearranged.
    • Non-productive V1-J1 rearrangements are prevalent in lambda 1-negative peripheral B cells.
    • V1J3 junctions are frequently non-productive across all analyzed cell types.

    Conclusions:

    • A high probability of initiating V1-J1 rearrangement and a low probability of a productive V1J3 junction drive lambda 1 dominance and lambda 3 under-expression.
    • The intermediate proportion of lambda 2(V2) is likely due to a balance between rearrangement initiation and productive joint formation probabilities.
    • The proportion of lambda 2(Vx) cells is not solely explained by these rearrangement parameters.