THE CONNECTION BETWEEN HLA MICROSATELLITES AND HLA-B*27 GENE IN PATIENTS WITH PSORIATIC ARTHRITIS IN CROATIAN POPULATION

Broj: 1, 2011 Rubrika: Znanstveni rad Autori: Davor Štimac, Zorana Grubić, Katarina Štingl, Porin Perić, Božidar Ćurković, Renata Žunec

Istraživana je raznovrsnost četiri mikrosatelita HLA (D6S248, D6S2674, D6S2811 i D6S273) u skupini bolesnika s psorijatičnim artritisom (PsA) (N=22) i zdravim osobama (K; N=94) pozitivnima za gen HLAB*27, te povezanost haplotipskih veza gena HLA-B*27 s PsA. Svi ispitanici bili su prethodno tipizirani za gene HLA-A i -B metodom PCR-SSP i bili su HLA-B*27 pozitivni. Mikrosateliti HLA su analizirani metodom PCRSTR i elektroforezom u ALFexpress sekvenceru. Analiza raspodjele alela mikrosatelita HLA pokazala je statistički značajne razlike za alele D6S273-3 (PsA 21,1 % naspram K-4,9 %; P=0,0013) i D6S273-4 (PsA-15,8 % naspram K-32,1 %; P=0,0180), dok je analiza haplotipskih veza pokazala da je kombinacija HLA-B*27/D6S273-4 bila statistički značajno smanjena u skupini bolesnika s PsA u odnosu na kontrolnu skupinu (10,5 % i 40,2 %; P=0,0164). Dobiveni rezultati navode na pretpostavku da je u blizini mikrosatelita D6S273 smješten gen koji igra ulogu u etiopatogenezi PsA, no za konačnu potvrdu nužno je povećati skupinu bolesnika.

The polymorphism at HLA microsatellites (D6S248, D6S2674, D6S2811 and D6S273) among patients with psoriatic arthritis (PsA) (N=22) and healthy control subjects (K; N=94), as well as haplotypic associations between tested loci were analysed in this study. All subjects were previously typed for HLA-A and -B by PCR-SSP method and were HLA-B*27 positive. HLA microsatellites were analysed using PCR-STR method and electrophoresis in an ALFexpress sequencer. The results demonstrated statistically significant P value for following alleles: D6S273-3 (PsA-21.1 % vs. K-4.9 %; P=0.0013) and D6S273-4 (PsA-15.8 % vs. K-32.1 %; P=0.0180). Analysis of haplotypic associations showed the only statistically significant difference for combination HLA-B*27/D6S273-4 (PsA-10.5 % vs. K-40.2 %; P=0.0164). The results presented in this study lead to the assumption that some other gene/s involved in ethiology of PsA are located in the proximity of D6S273 microsatellite, but in order to reach a final conclusion, an increase in the number of patients is necessary.

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