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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Ann+Rheum+Dis
2016 ; 75
(11
): 2029-2036
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Genome-wide DNA methylation analysis in multiple tissues in primary Sjögren s
syndrome reveals regulatory effects at interferon-induced genes
#MMPMID26857698
Imgenberg-Kreuz J
; Sandling JK
; Almlöf JC
; Nordlund J
; Signér L
; Norheim KB
; Omdal R
; Rönnblom L
; Eloranta ML
; Syvänen AC
; Nordmark G
Ann Rheum Dis
2016[Nov]; 75
(11
): 2029-2036
PMID26857698
show ga
OBJECTIVES: Increasing evidence suggests an epigenetic contribution to the
pathogenesis of autoimmune diseases, including primary Sjögren's Syndrome (pSS).
The aim of this study was to investigate the role of DNA methylation in pSS by
analysing multiple tissues from patients and controls. METHODS: Genome-wide DNA
methylation profiles were generated using HumanMethylation450K BeadChips for
whole blood, CD19+ B cells and minor salivary gland biopsies. Gene expression was
analysed in CD19+ B cells by RNA-sequencing. Analysis of genetic regulatory
effects on DNA methylation at known pSS risk loci was performed. RESULTS: We
identified prominent hypomethylation of interferon (IFN)-regulated genes in whole
blood and CD19+ B cells, including at the genes MX1, IFI44L and PARP9,
replicating previous reports in pSS, as well as identifying a large number of
novel associations. Enrichment for genomic overlap with histone marks for
enhancer and promoter regions was observed. We showed for the first time that
hypomethylation of IFN-regulated genes in pSS B cells was associated with their
increased expression. In minor salivary gland biopsies we observed
hypomethylation of the IFN-induced gene OAS2. Pathway and disease analysis
resulted in enrichment of antigen presentation, IFN signalling and
lymphoproliferative disorders. Evidence for genetic control of methylation levels
at known pSS risk loci was observed. CONCLUSIONS: Our study highlights the role
of epigenetic regulation of IFN-induced genes in pSS where replication is needed
for novel findings. The association with altered gene expression suggests a
functional mechanism for differentially methylated CpG sites in pSS aetiology.