Investigating the Role of HLA Genes in Psoriatic Arthritis
Author Information
Author(s): Ho P Y P C, Barton A, Worthington J, Plant D, Griffiths C E M, Young H S, Bradburn P, Thomson W, Silman A J, Bruce I N
Primary Institution: University of Manchester
Hypothesis
The study aims to investigate the role of HLA-Cw*06 and HLA-DRB1 genes in susceptibility to psoriatic arthritis compared to psoriasis and undifferentiated inflammatory arthritis.
Conclusion
HLA-Cw*06 and HLA-DRB1*07 are associated with patients with psoriatic arthritis having type I psoriasis, indicating a genetic difference based on the age of onset of psoriasis.
Supporting Evidence
- HLA-Cw*06 is strongly associated with type I psoriasis.
- HLA-DRB1*07 is associated with patients with psoriatic arthritis having type I psoriasis.
- The primary association of HLA-Cw*06 is with type I psoriasis rather than psoriatic arthritis itself.
- Patients with psoriatic arthritis with type I psoriasis have a different genetic background compared to those with type II psoriasis.
Takeaway
This study found that certain genes are linked to a type of arthritis that comes with psoriasis, especially when psoriasis starts early in life.
Methodology
A case-control association study comparing HLA-Cw*06 and HLA-DRB1 phenotype frequencies among patients with psoriatic arthritis, psoriasis, and healthy controls.
Potential Biases
Potential misclassification of patients could introduce bias in the association results.
Limitations
The study may have misclassified some patients with rheumatoid arthritis as having psoriatic arthritis due to broad inclusion criteria.
Participant Demographics
Participants were predominantly white Caucasians of British descent, with a near-equal gender distribution in the psoriatic arthritis cohort.
Statistical Information
P-Value
4.39×10−13
Confidence Interval
95% CI 3.2, 7.9
Statistical Significance
p<0.00001
Digital Object Identifier (DOI)
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