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Predictive value of interleukin 1 gene polymorphisms for surgery
A Crilly1, N Maiden, H A Capell
1University Department of Medicine, 10 Alexandra Parade, Glasgow Royal Infirmary, Glasgow G31 2ER, UK.
Annals of the Rheumatic Diseases
|September 8, 2000
Summary
Interleukin-1 beta (IL1beta) allele 2 is more common in rheumatoid arthritis patients needing major joint surgery and is linked to higher initial inflammation markers. This finding may help predict early surgery needs in some patients.
Area of Science:
- Immunogenetics
- Rheumatology
- Genetics
Background:
- Rheumatoid arthritis (RA) is an autoimmune disease characterized by joint inflammation.
- Genetic factors, including polymorphisms in cytokine genes, play a role in RA pathogenesis and disease severity.
- The need for major joint surgery is a significant indicator of severe RA progression.
Purpose of the Study:
- To investigate the association between polymorphisms in interleukin 1alpha (IL1alpha), IL1beta, and IL1 receptor antagonist genes and the need for major joint surgery in rheumatoid arthritis patients.
- To assess if these genetic variations influence disease outcome within 15 years of diagnosis.
Main Methods:
- A case-control study involving 50 RA patients requiring major joint surgery, 50 RA patients without major surgery, and 66 healthy controls.
- Genotyping for IL1alpha, IL1beta, and IL1 receptor antagonist gene polymorphisms using genomic DNA and polymerase chain reaction.
- Recording of HLA-DR beta1 gene status and initial erythrocyte sedimentation rate (ESR) for all RA patients.
Main Results:
- No significant differences in IL1alpha or IL1 receptor antagonist gene polymorphisms between patient groups and controls.
- IL1beta allele 2 was significantly overrepresented in RA patients who underwent major joint surgery compared to those who did not (40% vs. 27%, p=0.04).
- Patients with IL1beta allele 2 had a higher initial ESR (36 mm/1st h vs. 22 mm/1st h, p=0.04).
- IL1beta allele 2 was also more frequent in the surgery cohort among patients without two disease-associated HLA-DR beta1 alleles (42% vs. 25%, p=0.03).
Conclusions:
- The IL1beta allele 2 is associated with an increased likelihood of requiring major joint surgery in rheumatoid arthritis.
- Higher initial ESR in patients carrying IL1beta allele 2 suggests a link to greater inflammation.
- IL1beta allele 2 may serve as a predictive marker for early surgery in specific patient subgroups, particularly those without certain HLA-DR beta1 alleles.
- Further functional and epidemiological studies are warranted to validate these findings.