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Immunoglobulin lambda light chain orphons on human chromosome 8q11.2

J P Frippiat1, P Dard, S Marsh

  • 1Centre for Protein Engineering, MRC, Cambridge, GB. frippiat@scbiol.u-nancy.fr

European Journal of Immunology
|May 1, 1997
PubMed
Summary

Researchers discovered two novel V lambda genes on chromosome 8q11.2, distinct from the main lambda locus. These genes, identified in humans and gorillas, suggest ancient gene duplication and translocation events in immunoglobulin lambda light chain evolution.

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Area of Science:

  • Immunogenetics
  • Evolutionary Biology
  • Human Genetics

Background:

  • The human immunoglobulin lambda light chain locus is primarily located on chromosome 22q11.2.
  • Understanding the full repertoire and evolutionary history of immunoglobulin genes is crucial for immune system research.

Purpose of the Study:

  • To identify and characterize novel V lambda genes located outside the established major lambda locus.
  • To investigate the evolutionary origins and distribution of these newly identified V lambda genes.

Main Methods:

  • Hybridization studies using V lambda probes to screen human genomic DNA.
  • DNA sequencing of identified gene candidates.
  • Population genetics analysis across diverse human populations and comparative genomics with non-human primates.

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Main Results:

  • Two V lambda genes, named Orphée1 and Orphée2, were identified on chromosome 8q11.2.
  • Orphée1, belonging to the V lambda 8 family, was present in all 140 individuals tested and also found in gorillas.
  • Orphée2 showed weak hybridization, suggesting it may be a pseudogene or less conserved.

Conclusions:

  • The identified V lambda genes likely arose from duplication and translocation of V lambda 8 genes from the major locus prior to human-gorilla divergence.
  • The human lambda locus appears to have undergone less evolutionary rearrangement compared to the kappa light chain and heavy chain loci.