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Related Experiment Videos

Intergenic exchange maintains identity between two human lambda light chain immunoglobulin gene intron sequences.

J A Udey1, B B Blomberg

  • 1Department of Microbiology and Immunology, University of Miami Medical School, FL 33101.

Nucleic Acids Research
|April 11, 1988
PubMed
Summary

Gene conversion in the human lambda light chain immunoglobulin locus is suggested by sequence data. This recombinational event may maintain homogeneity within the human lambda gene family.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Human Genetics

Background:

  • The human lambda light chain immunoglobulin locus contains duplicated genes.
  • Understanding recombination mechanisms is crucial for immunoglobulin gene evolution.

Purpose of the Study:

  • To investigate evidence for gene conversion or unequal double crossover in the human lambda light chain immunoglobulin locus.
  • To elucidate the mechanisms maintaining sequence homogeneity within gene families.

Main Methods:

  • Sequence analysis of J2C2-J3C3 intron cross-hybridization.
  • Comparison of J lambda 2 and J lambda 3 coding and intron sequences.
  • Analysis of C lambda 2 and C lambda 3 coding regions for base differences.

Main Results:

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  • High J2C2-J3C3 intron cross-hybridization observed.
  • Identical J lambda 2 and J lambda 3 coding and intron sequences found.
  • Multiple base differences noted between C lambda 2 and C lambda 3 coding regions.
  • Both unconverted and converted alleles present in the normal gene pool.

Conclusions:

  • A recombinational event likely converted J lambda 2 sequences to J lambda 3.
  • Intergenic exchanges may maintain sequence homogeneity and functionality in the human lambda gene family.