Abstract
The association of HLA-C and ERAP1 polymorphisms in early and late onset psoriasis and psoriatic arthritis patients of Hungary
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
- MTA-SZTE Dermatological Research Group, University of Szeged, Szeged, Hungary
- Department of Medical Genetics, University of Szeged, Szeged, Hungary
- Department of Rheumatology, University of Szeged, Szeged, Hungary
- Department of Rheumatology, Pándy Kálmán Békés County Hospital, Gyula, Hungary
- Department of Dermatology, Venereology and Oncodermatology, University of Pécs, Pécs, Hungary
Introduction
Single nucleotide polymorphisms (SNPs) of the HLA-C and ERAP1 genes were recently determined to contribute to psoriasis susceptibility. However, data regarding the association of these genes with specific subgroups of psoriasis are scarce. Aim: To examine the possible association of the HLA-C and ERAP-1 polymorphisms with early and late onset psoriasis and psoriatic arthritis.
Material and methods
Five ERAP1 SNPs and two HLA-C SNPs were genotyped in 105 psoriatic arthritis patients, 214 cutaneous psoriasis patients and 200 healthy individuals. Haplotypes were constructed for three ERAP1 SNPs (rs17482078, rs10050860, rs30187), and interaction between HLA-Cw*0602 and ERAP1 was also analysed.
Results
The HLA-Cw*0602 rs10484554 SNP was found to be a strong susceptibility factor for early onset cutaneous psoriasis and early onset psoriatic arthritis. ERAP1 SNPs (rs10050860, rs17482078, rs27525) appear to have a protective function for early onset psoriatic arthritis. The haplotype B was identified as a susceptibility factor for late onset psoriatic arthritis. In HLA-C positive individuals the rs27524 ERAP1 SNP was associated with a significantly increased risk of psoriatic arthritis development, whereas the rs27525 ERAP1 SNP had the opposite effect.
Conclusions
These results suggest that the HLA-C and ERAP1 genes contribute to the pathogenesis of psoriasis and psoriatic arthritis in an age-dependent manner.
Keywords
HLA-C, ERAP1, psoriasis, psoriatic arthritis, polymorphism
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