PT  - JOURNAL ARTICLE
AU  - John Londono
AU  - Ana M Santos
AU  - Juan C Rueda
AU  - Enrique Calvo-Paramo
AU  - Ruben Burgos-Vargas
AU  - Gilberto Vargas-Alarcon
AU  - Nancy Martinez-Rodriguez
AU  - Sofia Arias-Correal
AU  - Guisselle-Nathalia Muñoz
AU  - Diana Padilla
AU  - Francy Cuervo
AU  - Viviana Reyes-Martinez
AU  - Santiago Bernal-Macías
AU  - Catalina Villota-Eraso
AU  - Luz M Avila-Portillo
AU  - Consuelo Romero
AU  - Juan F Medina
TI  - Association of ERAP2 polymorphisms in Colombian HLA-B27+ or HLA-B15+ patients with SpA and its relationship with clinical presentation: axial or peripheral predominance
AID  - 10.1136/rmdopen-2020-001250
DP  - 2020 Sep 01
TA  - RMD Open
PG  - e001250
VI  - 6
IP  - 2
4099  - http://rmdopen.bmj.com/content/6/2/e001250.short
4100  - http://rmdopen.bmj.com/content/6/2/e001250.full
SO  - RMD Open2020 Sep 01; 6
AB  - Objective To determine the association between endoplasmic reticulum aminopeptidase (ERAP)1 and ERAP2 single-nucleotide polymorphisms (SNPs) and human leukocyte antigens (HLA)-B27+ or HLA-B15+ patients with spondyloarthritis (SpA).Methods 104 patients with SpA according to Assessment of Spondyloarthritis International Society criteria were included in the study. HLA typing was performed by PCR. The polymorphisms were determined by real-time PCR on genomic DNA using customised probes for SNPs rs27044, rs17482078, rs10050860 and rs30187 in ERAP1, and rs2910686, rs2248374 and rs2549782 in ERAP2.Results 70 of the104 patients with SpA were HLA-B27+ and 34 were HLA-B15+. The distribution of ERAP1 and ERAP2 SNPs between the HLA-B15+ and HLA-B27+ patients with SpA did not reveal differences. Likewise, no differences in the frequencies of ERAP1 SNP haplotypes and alleles HLA-B15 or HLA-B27 were found. Interestingly, however, the frequencies of three particular haplotypes formed by ERAP2 SNPs rs2549782/rs2248374/rs2910686 varied between HLA-B15+ and HLA-B27+ patients: the ERAP2 SNPs haplotype TGT was more common in HLA-B15+ patients with SpA (OR 2.943, 95% CI 1.264 to 6.585; P=0.009), whereas the ERAP2 SNP haplotypes TGC and CAT were more associated with HLA-B27+ patients with SpA: (OR 4.483, 95% CI 1.524 to 13.187; p=0.003) and (OR 9.014, 95% CI 1.181 to 68.807; p=0.009), respectively.Conclusion An association was found between HLA-B15+ patients with SpA and haplotype TGT of ERAP2 SNPs. On the other hand, HLA-B27+ patients with SpA were associated with ERAP2 haplotypes TGC and CAT. These associations could be related to the clinical presentation of the disease, specifically with a peripheral or axial predominance, respectively.