Transcription factor motif enrichment in whole transcriptome analysis identifies STAT4 and BCL6 as the most prominent binding motif in systemic juvenile idiopathic arthritis

• Published in: Arthritis research & therapy 2018-05, Vol.20 (1), p.98-98, Article 98
• Main Authors: Hügle, Boris, Schippers, Anastasia, Fischer, Nadine, Ohl, Kim, Denecke, Bernd, Ticconi, Fabio, Vastert, Bas, Costa, Ivan G, Haas, Johannes-Peter, Tenbrock, Klaus
• Format: Article
• Language: English
• Subjects: Adolescent; Antigens; Arthritis; Arthritis, Juvenile - diagnosis; Arthritis, Juvenile - genetics; Arthritis, Juvenile - metabolism; Autoimmunity; CD177; CD74; Child; Child, Preschool; Cohort Studies; Development and progression; Female; Fever; Gene expression; Gene Expression Profiling - methods; Health aspects; HLA-DRB1; Humans; Immunologic research; Infant; Juvenile arthritis; Juvenile idiopathic arthritis; Juvenile systemic arthritis; Longitudinal Studies; Male; Neutrophils; Patients; Pediatrics; Protein Binding - physiology; Proto-Oncogene Proteins c-bcl-6 - genetics; Proto-Oncogene Proteins c-bcl-6 - metabolism; Retrospective Studies; Rheumatoid arthritis; Rheumatology; RNA expression; RNA polymerase; STAT proteins; STAT4 Transcription Factor - genetics; STAT4 Transcription Factor - metabolism; Systemic diseases; Transcription Factors - genetics; Transcription Factors - metabolism; Zinc finger proteins
• ISSN: 1478-6362; 1478-6354; 1478-6362
• DOI: 10.1186/s13075-018-1603-2

The term systemic juvenile idiopathic arthritis (sJIA) describes an autoinflammatory condition characterized by arthritis and severe systemic inflammation, which in later stages can transform into interleukin (IL)-17-driven autoimmune arthritis. IL-1 antagonists have been used with good efficacy in the early stages of sJIA. A whole transcriptome analysis of peripheral blood RNA samples was performed in six patients with sJIA and active systemic disease, before initiating treatment with the IL-1β receptor antagonist anakinra, and after induction of inactive disease, compared with a single-sample control cohort of 21 patients in several clinical stages of sJIA activity. Whole transcriptomes were compared longitudinally and interindividually including gene ontology and motif enrichment analysis of differentially expressed genes. There were 741 transcripts were identified using a threshold with a p value  2. HLADRB1 and CD74 were identified as the most strongly upregulated genes in inactive compared to active disease; CD177 expression was significantly enhanced in active disease compared to inactive disease. Motif enrichment analysis revealed STAT4, BCL6, and STAT3 as the most prominent transcription factors that were present during active disease. In addition, strong upregulation of the major histocompatability complex II (MHCII) ligand CD74 was found in both active and inactive sJIA compared to healthy controls. Using transcription factor motif enrichment, this study identifies novel putative pathways in sJIA (STAT4, BCL6) implicating B cell activation at an earlier stage than predicted in refractory disease. The implication of BCL-6 dependent pathways argues for occurrence of autoimmunity early within the process of sJIA chronification. Transcriptional regulation of HLA-DRB1, a recently described independent genetic risk factor, in combination with its cooperating partner CD74 in patients where sJIA is confirmed, supports pathogenic involvement in alterations in antigen presentation during sJIA.