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Related Experiment Videos

Genes encoding Xenopus laevis Ig L chains. Implications for the evolution of kappa and lambda chains.

D J Zezza1, S E Stewart, L A Steiner

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Journal of Immunology (Baltimore, Md. : 1950)
|December 15, 1992
PubMed
Summary

Xenopus laevis immunoglobulin (Ig) light (L) chains include rho (L1) and sigma (L2) types. Analysis of Xenopus genomic DNA suggests L1 L chain genes are part of the kappa gene family.

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Area of Science:

  • Immunogenetics
  • Comparative genomics
  • Amphibian immunology

Background:

  • Xenopus laevis immunoglobulins (Ig) possess two distinct light (L) chain types: rho (L1) and sigma (L2).
  • Understanding the genetic basis of these L chains is crucial for comparative immunology.

Purpose of the Study:

  • To analyze the genomic organization and sequence of Xenopus laevis L1 L chain genes.
  • To determine the evolutionary relationship of Xenopus L1 L chain genes to mammalian Ig gene families.

Main Methods:

  • Southern blotting of Xenopus genomic DNA using cDNA probes specific for L1 V and C regions.
  • Isolation and characterization of genomic clones containing L1 L chain gene segments (V, J, C).
  • Sequence analysis of identified gene segments and comparison with mammalian Ig sequences.

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Main Results:

  • Southern blots revealed multiple V gene fragments and few C gene fragments for L1.
  • Genomic clones contained C, J, and V gene segments with typical Ig gene features.
  • Xenopus L1 J and C segments showed greater similarity to mammalian kappa chains than lambda chains.
  • Four V gene segments were identified, exhibiting similarities to mammalian V kappa genes, including recombination signal sequences.

Conclusions:

  • The identified gene segments and their organization strongly suggest that Xenopus L1 L chain genes belong to the kappa gene family.
  • This finding provides insights into the evolution of Ig light chain genes in amphibians.