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Related Experiment Videos

Human immunoglobulin C lambda 6 gene encodes the Kern+Oz-lambda chain and C lambda 4 and C lambda 5 are pseudogenes.

P Dariavach1, G Lefranc, M P Lefranc

  • 1Laboratoire d'Immunogénétique, Université des Sciences et Techniques du Languedoc, Montpellier, France.

Proceedings of the National Academy of Sciences of the United States of America
|December 1, 1987
PubMed
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Researchers sequenced downstream immunoglobulin lambda constant region genes. They identified a new isotype (C lambda 6) and two pseudogenes, revealing complexity in human lambda gene clusters.

Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Human Genetics

Background:

  • Six nonallelic immunoglobulin lambda constant region genes (C lambda 1-C lambda 6) are located within a 40-kilobase DNA region.
  • The nucleotide sequences and encoded isotypic regions (Mcg, Kern-Oz-, Kern-Oz+) of the upstream genes (C lambda 1-C lambda 3) have been previously determined.
  • The human lambda locus is known for its polymorphism and complexity, with at least three isotypic differences identified.

Purpose of the Study:

  • To determine the nucleotide sequences of the three downstream immunoglobulin lambda constant region genes (C lambda 4-C lambda 6).
  • To identify functional genes and pseudogenes within this cluster.
  • To characterize the potential functional role of the downstream genes in human lambda chain diversity.

Main Methods:

Related Experiment Videos

  • DNA sequencing of the downstream gene cluster (C lambda 4-C lambda 6).
  • Sequence analysis to identify gene structure and potential pseudogenes.
  • Comparison of encoded amino acid sequences with known lambda proteins and Bence Jones proteins.

Main Results:

  • Two of the downstream genes, C lambda 4 and C lambda 5, were identified as pseudogenes.
  • The C lambda 6 gene encodes a Kern+Oz- chain, representing a fourth described isotype.
  • A potentially active J lambda (joining) segment was located upstream of C lambda 6, suggesting a functional rearrangement site.

Conclusions:

  • The human immunoglobulin lambda locus exhibits significant complexity due to the presence of pseudogenes and multiple functional isotypes.
  • The C lambda 6 gene expands the known diversity of human lambda constant regions.
  • The identified J lambda segment indicates potential for generating novel lambda chain variants through V-J recombination.