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Romanian Journal of Rheumatology, Volume XXV, No. 1, 2016
ISSN 1843-0791  |  e-ISSN 2069-6086
ISSN-L 1843-0791
DOI: 10.37897/RJR

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INTERLEUKIN 1A GENE POLYMORPHISMS IN ROMANIAN PATIENTS WITH SERONEGATIVE SPONDYLOARTHROPATHIES

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ABSTRACT

Objective. The aim of this study was to investigate whether two IL1A gene polymorphisms, rs17561 and rs1800587, influence disease susceptibility for seronegative spondyloarthropathies (SpA) in Romanians. Subsequently, we analysed separately ankylosing spondylitis (AS) and psoriatic arthritis (PsA) subgroups in relation with the two IL1A gene variants.

Methods. The study included 240 SpA patients (140 AS and 100 PsA patients) and 160 healthy controls. Real-time polymerase chain reaction (RT-PCR) was used to genotype the two single nucleotide polymorphisms (SNPs). Allele, genotype and haplotype frequencies of each SNP were compared between SpA patients and controls and also between AS and PsA cohorts and controls. The PLINK 1.9 software package was used to assess the potential associations; p values ≤ 0.05 were considered significant.

Results. The minor allele T frequency for rs17561 polymorphism was similar in general SpA cohort (31.4%) compared with controls (32.8%), the statistical analyses confirming the lack of association (p=0.67). Almost identical results were found for rs1800587: minor allele T frequency was 29.1% in SpA patients and 29.7% in controls (p=0.85). The same pattern persisted for the separate analysis of HLA-B27 positive SpA patients or AS and PsA cases against controls.

Conclusions. The IL1A gene polymorphisms (rs17561 and rs1800587) do not influence the disease predisposition for seronegative spondyloarthropathies in general, nor for ankylosing spondylitis and psoriatic arthritis in particular, in Romanians.

Keywords: IL1A gene, seronegative spondyloarthropathies (SpA), ankylosing spondylitis (AS), psoriatic arthritis (PsA), single nucleotide polymorphisms (SNPs)

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