Details

Autor(en) / Beteiligte

• Imgenberg-Kreuz, Juliana
• Carlsson Almlöf, Jonas
• Leonard, Dag
• Alexsson, Andrei
• Nordmark, Gunnel
• Eloranta, Maija-Leena
• Rantapää-Dahlqvist, Solbritt
• Bengtsson, Anders A
• Jönsen, Andreas
• Padyukov, Leonid
• Gunnarsson, Iva
• Svenungsson, Elisabet
• Sjöwall, Christopher
• Rönnblom, Lars
• Syvänen, Ann-Christine
• Sandling, Johanna K

Titel

DNA methylation mapping identifies gene regulatory effects in patients with systemic lupus erythematosus

Ist Teil von

• Annals of the rheumatic diseases, 2018-05, Vol.77 (5), p.736

Ort / Verlag

England

Erscheinungsjahr

2018

Quelle

MEDLINE

Beschreibungen/Notizen

• Systemic lupus erythematosus (SLE) is a chronic autoimmune condition with heterogeneous presentation and complex aetiology where DNA methylation changes are emerging as a contributing factor. In order to discover novel epigenetic associations and investigate their relationship to genetic risk for SLE, we analysed DNA methylation profiles in a large collection of patients with SLE and healthy individuals. DNA extracted from blood from 548 patients with SLE and 587 healthy controls were analysed on the Illumina HumanMethylation 450 k BeadChip, which targets 485 000 CpG sites across the genome. Single nucleotide polymorphism (SNP) genotype data for 196 524 SNPs on the Illumina ImmunoChip from the same individuals were utilised for methylation quantitative trait loci ( -meQTLs) analyses. We identified and replicated differentially methylated CpGs (DMCs) in SLE at 7245 CpG sites in the genome. The largest methylation differences were observed at type I interferon-regulated genes which exhibited decreased methylation in SLE. We mapped -meQTLs and identified genetic regulation of methylation levels at 466 of the DMCs in SLE. The meQTLs for DMCs in SLE were enriched for genetic association to SLE, and included seven SLE genome-wide association study (GWAS) loci: (CD45), , , , , and . In addition, we observed association between genotype and variance of methylation at 20 DMCs in SLE, including at the locus. Our results suggest that several of the genetic risk variants for SLE may exert their influence on the phenotype through alteration of DNA methylation levels at regulatory regions of target genes.