Heterogeneity of synovial molecular patterns in patients with arthritis
Bernard R Lauwerys, Daniel Hernández-Lobato, Pierre Gramme, Julie Ducreux, Adrien Dessy, Isabelle Focant, Jérôme Ambroise, Bertrand Bearzatto, Adrien Nzeusseu Toukap, Benoît J Van den Eynde, Dirk Elewaut, Jean-Luc Gala, Patrick Durez, Frédéric A Houssiau, Thibault Helleputte, Pierre Dupont, Bernard R Lauwerys, Daniel Hernández-Lobato, Pierre Gramme, Julie Ducreux, Adrien Dessy, Isabelle Focant, Jérôme Ambroise, Bertrand Bearzatto, Adrien Nzeusseu Toukap, Benoît J Van den Eynde, Dirk Elewaut, Jean-Luc Gala, Patrick Durez, Frédéric A Houssiau, Thibault Helleputte, Pierre Dupont
Abstract
Objectives: Early diagnosis of rheumatoid arthritis (RA) is an unmet medical need in the field of rheumatology. Previously, we performed high-density transcriptomic studies on synovial biopsies from patients with arthritis, and found that synovial gene expression profiles were significantly different according to the underlying disorder. Here, we wanted to further explore the consistency of the gene expression signals in synovial biopsies of patients with arthritis, using low-density platforms.
Methods: Low-density assays (cDNA microarray and microfluidics qPCR) were designed, based on the results of the high-density microarray data. Knee synovial biopsies were obtained from patients with RA, spondyloarthropathies (SA) or osteoarthritis (OA) (n = 39), and also from patients with initial undifferentiated arthritis (UA) (n = 49).
Results: According to high-density microarray data, several molecular pathways are differentially expressed in patients with RA, SA and OA: T and B cell activation, chromatin remodelling, RAS GTPase activation and extracellular matrix regulation. Strikingly, disease activity (DAS28-CRP) has a significant influence on gene expression patterns in RA samples. Using the low-density assays, samples from patients with OA are easily discriminated from RA and SA samples. However, overlapping molecular patterns are found, in particular between RA and SA biopsies. Therefore, prediction of the clinical diagnosis based on gene expression data results in a diagnostic accuracy of 56.8%, which is increased up to 98.6% by the addition of specific clinical symptoms in the prediction algorithm. Similar observations are made in initial UA samples, in which overlapping molecular patterns also impact the accuracy of the diagnostic algorithm. When clinical symptoms are added, the diagnostic accuracy is strongly improved.
Conclusions: Gene expression signatures are overall different in patients with OA, RA and SA, but overlapping molecular signatures are found in patients with these conditions. Therefore, an accurate diagnosis in patients with UA requires a combination of gene expression and clinical data.
Conflict of interest statement
Competing Interests: A patent application (12/528,615 based on PCT Application N° PCT/EP2008/052532: « Method for the determination and the classification of rheumatic conditions) was deposited by the Université catholique de Louvain (BRL, FAH and BJVdE). This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials. TH is CEO and PD is founder of DNAlytics, a spin-off company of the Université catholique de Louvain that currently develops a diagnostic application based on the results presented in this manuscript. PG is a collaborator of DNAlytics. All other authors declare that they have no competing interests.
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Source: PubMed