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Molecular subtypes of systemic sclerosis in association with anti-centromere antibodies and digital ulcers

Abstract

The objective of this study was to identify molecular profiles that may distinguish clinical subtypes in systemic sclerosis (SSc). Large-scale gene expression profiling was performed on peripheral blood (PB) from 12 SSc patients and 6 healthy individuals. Significance analysis of microarrays, two-way hierarchical cluster analysis and PANTHER (Protein ANalysis THrough Evolutionary Relationships) ontology classification were used to analyze the data. Quantitative PCR was applied for validation in a cohort of 43 SSc patients. The results show that the expression of genes involved in immune defense, cell cycle and signal transduction was significantly elevated in PB of SSc patients (n=12) compared with healthy individuals (n=6). SSc patients could be stratified into subgroups based on differential expression of genes induced by type I interferon (IFN) and genes involved in antimicrobial (AM) activity. Differential expression of type I IFN or AM signature genes was validated and extended in an independent cohort of 31 patients by quantitative PCR. Low expression of IFN response genes was associated with the presence of anti-centromere antibodies, whereas increased expression was associated with the appearance of digital ulcers. In conclusion, patients with SSc can be classified on the basis of differential expression of immune defense genes. Differences in the activity of the type I IFN response program stratify patients into two clinically relevant subgroups.

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Acknowledgements

This study was supported in part by the AUTOROME (a European research network, representing Centers of Excellence in Europe, studying immune responses in rare autoimmune diseases to novel therapeutic intervention strategies) and Centre for Medical Systems Biology (a Center of Excellence approved by the Netherlands Genomics Initiative/Netherlands Organization for Scientific Research). These sponsors had no involvement in the study design, analysis or interpretation of the data and publications.

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Correspondence to C L Verweij.

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Supplementary Information accompanies the paper on Genes and Immunity website (http://www.nature.com/gene)

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Bos, C., van Baarsen, L., Timmer, T. et al. Molecular subtypes of systemic sclerosis in association with anti-centromere antibodies and digital ulcers. Genes Immun 10, 210–218 (2009). https://doi.org/10.1038/gene.2008.98

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