DNA methylation at IL32 in juvenile idiopathic arthritis

Juvenile idiopathic arthritis (JIA) is the most common autoimmune rheumatic disease of childhood. We recently showed that DNA methylation at the gene encoding the pro-inflammatory cytokine interleukin-32 ( IL32 ) is reduced in JIA CD4+ T cells. To extend this finding, we measured IL32 methylation in...

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Bibliographic Details
Published in:Scientific reports 2015-06, Vol.5 (1), p.11063-11063, Article 11063
Main Authors: Meyer, Braydon, Chavez, Raul A., Munro, Jane E., Chiaroni-Clarke, Rachel C., Akikusa, Jonathan D., Allen, Roger C., Craig, Jeffrey M., Ponsonby, Anne-Louise, Saffery, Richard, Ellis, Justine A.
Format: Article
Language:English
Subjects:
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Arthritis
Arthritis, Juvenile - genetics
CD4 antigen
CD4-Positive T-Lymphocytes - metabolism
CD8 antigen
Children
CpG islands
Deoxyribonucleic acid
DNA
DNA Methylation
Humanities and Social Sciences
Humans
Inflammation
Interleukins - metabolism
Isoforms
Lymphocytes T
multidisciplinary
Polymorphism, Single Nucleotide
Rheumatic diseases
Science
Single-nucleotide polymorphism
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Summary:Juvenile idiopathic arthritis (JIA) is the most common autoimmune rheumatic disease of childhood. We recently showed that DNA methylation at the gene encoding the pro-inflammatory cytokine interleukin-32 ( IL32 ) is reduced in JIA CD4+ T cells. To extend this finding, we measured IL32 methylation in CD4+ T-cells from an additional sample of JIA cases and age- and sex-matched controls and found a reduction in methylation associated with JIA consistent with the prior data (combined case-control dataset: 25.0% vs 37.7%, p = 0.0045). Further, JIA was associated with reduced IL32 methylation in CD8+ T cells (15.2% vs 25.5%, p = 0.034), suggesting disease-associated changes to a T cell precursor. Additionally, we measured regional SNPs, along with CD4+ T cell expression of total IL32 and the γ and β isoforms. Several SNPs were associated with methylation. Two SNPs were also associated with JIA and we found evidence of interaction such that methylation was only associated with JIA in minor allele carriers (e.g. rs10431961 p interaction  = 0.011). Methylation at one measured CpG was inversely correlated with total IL32 expression (Spearman r = −0.73, p = 0.0009), but this was not a JIA-associated CpG. Overall, our data further confirms that reduced IL32 methylation is associated with JIA and that SNPs play an interactive role.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep11063