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Ochoa E.,Institute Parasitologia y Biomedicina Lopez Neyra | Martin J.-E.,Institute Parasitologia y Biomedicina Lopez Neyra | Assassi S.,University of Texas Health Science Center at Houston | Beretta L.,systemIC | And 69 more authors.
Clinical and Experimental Rheumatology | Year: 2015

Objective. The current knowledge of the influence of systemic sclerosis (SSc) risk loci in the clinical sub-phenotypes is still limited. The main limitation lies in the low frequency of some sub-phenotypes which could be solved by replication studies in independent cohorts and meta-analysis between studies. In this regard, CCR6 gene variants have been recently associated with anti-topoisomerase I positive (ATA+) production in SSc patients in a candidate gene study. This gene has been proposed to have a critical role in IL-17-driven autoimmunity in human diseases. Methods. In order to confirm the association between CCR6 and ATA+ SSc patients, we performed an independent replication study in populations of European ancestry. We studied two CCR6 genetic variants (rs968334 and rs3093024) in a total of 901 ATA+ SSc cases, 3,258 ATA- SSc cases and 7,865 healthy controls and compared allelic frequencies for those SNPs in ATA+ SSc with healthy controls and also with ATA- SSc patients. Results. The comparison performed between ATA+ SSc patients and healthy controls showed significant association with SNP rs968334 (p=4.88 x 10-2, OR=1.11). When we compared ATA+ SSc cases with ATA- SSc, both SNPs, rs3093024 and rs968334, showed significant associations (p=2.89 x 10-2, OR=1.13; p=1.69 x 10-2, OR=1.15). Finally, in order to increase even more sample size and statistical power, we meta-analysed our study with the previous reported and found a significant association between SNP rs3093024 and ATA+ SSc patients (p=1.00 x 10-4, OR=1.16) comparing with healthy controls. Conclusion. Our work confirms the association of CCR6 gene and ATA+ SSc patients. © Clinical and Experimental Rheumatology 2015.


Lopez-Isac E.,Institute of Parasitology and Biomedicine Lopez Neyra | Campillo-Davo D.,Institute of Parasitology and Biomedicine Lopez Neyra | Bossini-Castillo L.,Institute of Parasitology and Biomedicine Lopez Neyra | Guerra S.G.,University College London | And 70 more authors.
Annals of the Rheumatic Diseases | Year: 2015

Objectives TYK2 is a common genetic risk factor for several autoimmune diseases. This gene encodes a protein kinase involved in interleukin 12 (IL-12) pathway, which is a well-known player in the pathogenesis of systemic sclerosis (SSc). Therefore, we aimed to assess the possible role of this locus in SSc. Methods This study comprised a total of 7103 patients with SSc and 12 220 healthy controls of European ancestry from Spain, USA, Germany, the Netherlands, Italy and the UK. Four TYK2 single-nucleotide polymorphisms (V362F (rs2304256), P1104A (rs34536443), I684S (rs12720356) and A928V (rs35018800)) were selected for follow-up based on the results of an Immunochip screening phase of the locus. Association and dependence analyses were performed by the means of logistic regression and conditional logistic regression. Meta-analyses were performed using the inverse variance method. Results Genome-wide significance level was reached for TYK2 V362F common variant in our pooled analysis (p=3.08×10-13, OR=0.83), while the association of P1104A, A928V and I684S rare and low-frequency missense variants remained significant with nominal signals (p=2.28×10-3, OR=0.80; p=1.27×10-3, OR=0.59; p=2.63×10-5, OR=0.83, respectively). Interestingly, dependence and allelic combination analyses showed that the strong association observed for V362F with SSc, corresponded to a synthetic association dependent on the effect of the three previously mentioned TYK2 missense variants. Conclusions We report for the first time the association of TYK2 with SSc and reinforce the relevance of the IL-12 pathway in SSc pathophysiology. © 2015 BMJ Publishing Group Ltd & European League Against Rheumatism.


Lopez-Isac E.,Institute Parasitologia y Biomedicina Lopez Neyra | Bossini-Castillo L.,Institute Parasitologia y Biomedicina Lopez Neyra | Simeon C.P.,Servicio de Medicina Interna | Egurbide M.V.,Hospital Universitario Cruces | And 68 more authors.
Arthritis Research and Therapy | Year: 2014

Introduction: A recent genome-wide association study (GWAS) comprising a French cohort of systemic sclerosis (SSc) reported several non-HLA single-nucleotide polymorphisms (SNPs) showing a nominal association in the discovery phase. We aimed to identify previously overlooked susceptibility variants by using a follow-up strategy.Methods: Sixty-six non-HLA SNPs showing a P value <10-4 in the discovery phase of the French SSc GWAS were analyzed in the first step of this study, performing a meta-analysis that combined data from the two published SSc GWASs. A total of 2,921 SSc patients and 6,963 healthy controls were included in this first phase. Two SNPs, PPARG rs310746 and CHRNA9 rs6832151, were selected for genotyping in the replication cohort (1,068 SSc patients and 6,762 healthy controls) based on the results of the first step. Genotyping was performed by using TaqMan SNP genotyping assays.Results: We observed nominal associations for both PPARG rs310746 (PMH = 1.90 × 10-6, OR, 1.28) and CHRNA9 rs6832151 (PMH = 4.30 × 10-6, OR, 1.17) genetic variants with SSc in the first step of our study. In the replication phase, we observed a trend of association for PPARG rs310746 (P value = 0.066; OR, 1.17). The combined overall Mantel-Haenszel meta-analysis of all the cohorts included in the present study revealed that PPARG rs310746 remained associated with SSc with a nominal non-genome-wide significant P value (PMH = 5.00 × 10-7; OR, 1.25). No evidence of association was observed for CHRNA9 rs6832151 either in the replication phase or in the overall pooled analysis.Conclusion: Our results suggest a role of PPARG gene in the development of SSc. © 2014 López-Isac et al.; licensee BioMed Central Ltd.

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