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Immunoglobulin lambda light chain genes in rheumatoid arthritis.

D Sidebottom1, D M Grennan, P A Sanders

  • 1University of Manchester Rheumatic Diseases Centre, Hope Hospital, Salford, UK.

Annals of the Rheumatic Diseases
|August 1, 1987
PubMed
Summary

Restriction fragment length polymorphisms in immunoglobulin lambda constant region genes were analyzed in rheumatoid arthritis patients. Specific gene variants were found to be more common in patients, suggesting a link to rheumatoid arthritis susceptibility.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Rheumatology

Background:

  • Rheumatoid arthritis (RA) is a chronic autoimmune disease with a complex etiology.
  • Genetic factors are known to play a role in RA susceptibility.
  • Immunoglobulin genes are potential candidates for influencing autoimmune diseases.

Purpose of the Study:

  • To investigate the association between immunoglobulin lambda constant region gene polymorphisms and rheumatoid arthritis.
  • To determine if specific RFLPs correlate with RA risk.

Main Methods:

  • Genomic DNA from rheumatoid arthritis patients and control subjects was analyzed.
  • Restriction fragment length polymorphisms (RFLPs) were detected using an immunoglobulin lambda constant region probe and Eco RI digests.

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  • Genotypes and allele frequencies were compared between groups.

    • Main Results:

    • Four polymorphic bands (8, 13, 18, and 23 kb) were identified.
    • The 8/8 genotype and 8 kb allele were significantly increased in the RA group.
    • The 8/18 genotype and 18 kb allele were decreased in the RA group, independent of HLA and Gm factors.

    Conclusions:

    • Genes linked to the immunoglobulin lambda constant region may influence susceptibility to rheumatoid arthritis.
    • Specific RFLPs in the immunoglobulin lambda constant region are associated with altered RA risk.
    • Further research into these genetic associations is warranted.