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Erosive polyarthritis and Crohn's disease. A case with HLA DRB1 determination
E Toussirot1, P Darmon, D Reviron
1Department of Internal Medicine, Centre Hospitalier, Ussel, France.
Insights
Erosive polyarthritis, a rare manifestation in inflammatory bowel diseases like Crohn's, may be linked to specific human leukocyte antigen (HLA) DR4 subtypes. Further research into HLA DR
Area of Science:
- Rheumatology
- Gastroenterology
- Immunogenetics
Background:
- Inflammatory bowel diseases (IBD) like Crohn's disease can present with extraintestinal manifestations, including arthritis.
- Erosive polyarthritis is an uncommon but severe joint complication associated with IBD.
- The genetic factors influencing erosive arthritis in IBD remain largely uncharacterized.
Observation:
- A case study of a 49-year-old woman with seronegative, peripheral, and asymmetrical polyarthritis with erosions who later developed Crohn's disease.
- The patient was diagnosed with erosive Crohn polyarthritis, with no evidence of rheumatoid arthritis.
- Genetic analysis revealed the patient was homozygous for HLA DR4, specifically with DRB1*0401/0404 subtypes.
Findings:
- The identified HLA DRB1*0401/0404 alleles are known susceptibility factors for rheumatoid arthritis, often associated with disease severity.
- This is the first reported instance of HLA DR typing in a patient with erosive Crohn polyarthritis.
- The patient's homozygosity for DR4 suggests a potential role for this genetic factor in the erosive nature of her arthritis.
Implications:
- The findings suggest that specific HLA DR alleles, particularly DR4, may contribute to the development of erosive arthritis in patients with Crohn's disease.
- This case highlights the need for further investigation into the role of human leukocyte antigen (HLA) in the pathogenesis of arthritic manifestations in inflammatory bowel diseases.
- Understanding these genetic links could inform diagnostic and therapeutic strategies for IBD-associated arthritis.
Abstract:
The authors report the case of a 49-year-old woman with an asymmetrical, seronegative and peripheral polyarthritis with erosions, who subsequently developed Crohn's disease. She was diagnosed as having an erosive Crohn polyarthritis as no evidence of rheumatoid arthritis was found. However, the patient was homozygote for DR4 and the HLA DRB1 oligotyping was 0401/0404. This corresponds to two susceptibility alleles for rheumatoid arthritis responsible for the severity of this disease. Erosive polyarthritis is rarely encountered in inflammatory bowel diseases. The underlying mechanism of the erosions in these conditions is unknown but granulomatous synovitis with contiguous erosive bone changes has been reported. HLA DR has not been previously reported in erosive Crohn polyarthritis. The homozygosity for DR4 with DRB1*0401/0404 subtypes suggests that DR4 could contribute to the erosive course in this patient. This question is of interest, and HLA DR must be further studied in inflammatory bowel diseases with erosive arthritic manifestations.