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Immunoglobulin allotypes in rheumatoid arthritis
1University of Manchester Rheumatic Diseases Centre, Hope Hospital, Salford, UK.
Experimental and Clinical Immunogenetics
|January 1, 1989
Summary
Genetic factors beyond the HLA region influence rheumatoid arthritis (RA) susceptibility. Immunoglobulin heavy chain allotypes (Gm) may interact with HLA genes, particularly in DR4-positive RA patients.
Area of Science:
- Immunogenetics
- Rheumatology
- Human Genetics
Background:
- Rheumatoid arthritis (RA) genetic predisposition is complex, with the Human Leukocyte Antigen (HLA) region on chromosome 6 contributing significantly but not exclusively.
- Previous research suggests a role for immunoglobulin heavy chain allotypes (Gm), encoded by genes on chromosome 14, in RA susceptibility.
- Immunoglobulin light chain allotypes (Km) on chromosome 2 have not shown consistent associations with RA.
Purpose of the Study:
- To review the evidence for the association of Gm allotypes with rheumatoid arthritis.
- To investigate potential interactions between Gm allotypes and HLA genes in RA pathogenesis.
- To explore the role of Gm allotypes in specific RA subgroups, such as those with anti-type II collagen antibodies.
Main Methods:
- Literature review of genetic association studies in rheumatoid arthritis.
- Analysis of evidence linking Gm allotypes, particularly G1m(x)-bearing haplotypes, to RA.
- Examination of studies investigating Gm associations in DR4-positive versus DR4-negative RA patients.
- Review of family studies assessing genetic linkage between Gm and RA susceptibility.
Main Results:
- Evidence suggests G1m(x)-bearing haplotypes are associated with DR4-positive RA, but not DR4-negative RA.
- Conflicting Gm associations have been reported in RA patients with antibodies to native type II collagen, indicating a potential distinct genetic subgroup.
- A family study found no evidence of genetic linkage between Gm allotypes and RA susceptibility.
- Immunoglobulin light chain allotypes (Km) show no consistent association with RA.
Conclusions:
- Gm allotypes, or linked genes on chromosome 14, may influence RA susceptibility through interaction with HLA region genes.
- The genetic contribution to RA is multifactorial, involving genes outside the HLA region.
- Further research is needed to elucidate the precise mechanisms of Gm involvement in RA pathogenesis, potentially in specific patient subgroups.