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Sequence and evolution of the human germline V lambda repertoire

S C Williams1, J P Frippiat, I M Tomlinson

  • 1MRC Centre for Protein Engineering Hills Road, Cambridge, UK.

Journal of Molecular Biology
|November 29, 1996
PubMed
Summary
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Researchers mapped the human immunoglobulin lambda (IGL) locus, identifying approximately 30 functional V lambda genes across ten families. These findings advance our understanding of the IGL locus and immune system diversity.

Area of Science:

  • Immunogenetics
  • Human genomics

Background:

  • The human immunoglobulin lambda (IGL) locus on chromosome 22q11.2 contains variable (V) lambda genes crucial for adaptive immunity.
  • Previous work mapped the IGL locus, revealing a clustered arrangement of V lambda genes from different families.

Purpose of the Study:

  • To sequence all V lambda genes within the human IGL locus.
  • To determine the number of functional V lambda genes and their family distribution.
  • To compare the IGL gene repertoire with expressed lambda light chains.

Main Methods:

  • High-throughput sequencing of the human IGL locus.
  • Bioinformatic analysis to identify and annotate V lambda genes.
  • Comparison with expressed immunoglobulin repertoires to assess functionality.

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Main Results:

  • Approximately 30 functional V lambda genes were identified, distributed across ten distinct V lambda families.
  • Specific counts for each family include: V lambda 1 (5), V lambda 2 (5), V lambda 3 (8), V lambda 4 (3), V lambda 5 (3), V lambda 6 (1), V lambda 7 (2), V lambda 8 (1), V lambda 9 (1), and V lambda 10 (1).
  • V lambda genes belonging to major families (V lambda 1, V lambda 2, V lambda 3) are predominant in species primarily expressing lambda light chains.

Conclusions:

  • The human IGL locus comprises a defined set of functional V lambda genes, contributing to the diversity of the antibody repertoire.
  • The identified gene repertoire provides a foundation for understanding IGL locus variation and its implications in immune responses.
  • The predominance of certain V lambda families in lambda-expressing species highlights evolutionary conservation and functional selection.