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ObjectiveThe genetic components contribute to the Systemic lupus erythematosus development. This study for the first time determined the distribution of the polymorphisms and linkage disequilibrium in HLA class II, MICA and PRL gene among patients suffering from SLE and healthy Czech individuals. Patients and Methods DNA ConclusionHLA class II-MICA combinations may increase/decrease a risk for SLE development.Multiple studies focusing on the ethnical differences as well as genetic-epigenetic relationships are necessary for better understanding SLE pathogenesis.

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Psoriatic arthritis (PsA) is a chronic inflammatory joint disease which affects patients suffering from psoriasis. The genetic background especially the susceptibility loci on the short arm of the chromosome six contribute to PsA development. In our study, we looked for the role of the MICA and HLA-Cw genes polymorphisms in PsA pathogenesis. We investigated 100 PsA patients and 94 healthy Czech individuals. We found an association between HLA-Cw*06 and PsA namely PsA with psoriasis type I (age of psoriasis onset before 40 years) compared to healthy individuals (P (corrected) < 0.05, OR 2.56, CI 95% 1.33-4.76 and P (corrected) = 0.01, OR 3.03, CI 95% 1.53-5.88, respectively). The MICA-A9 allele of the transmembrane microsatelite MICA polymorphism occurred more frequently in PsA with psoriasis type II group (age of psoriasis onset after 40 years) than in controls, 58.6 versus 38.0%, respectively however, this finding did not reach a statistical significance after correction (P (corrected) = 0.085).