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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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DNA Methylation in Autoimmune Thyroid Disease.

Nicole Lafontaine1,2, Scott G Wilson1,3, John P Walsh1,2

  • 1Department of Endocrinology & Diabetes, Sir Charles Gairdner Hospital, Nedlands, Western Australia 6009, Australia.

The Journal of Clinical Endocrinology and Metabolism
|November 24, 2022
PubMed
Summary

DNA methylation (DNAm) is crucial in autoimmune thyroid disease (AITD). Studies show altered DNAm in genes linked to AITD, but more research is needed to confirm findings and explore therapeutic potential.

Keywords:
DNA methylationGraves diseaseHashimoto diseaseautoimmune diseasesautoimmune thyroiditisepigenome

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Area of Science:

  • Endocrinology and Immunology: Focuses on the interplay between epigenetic modifications and the pathogenesis of autoimmune thyroid diseases (AITD).
  • Molecular Biology: Investigates the role of DNA methylation as a key epigenetic mechanism linking environmental factors to gene expression in AITD.

Background:

  • Autoimmune thyroid diseases (AITD), including Graves' and Hashimoto's diseases, result from complex genetic and environmental interactions.
  • Epigenetics, particularly DNA methylation (DNAm), is emerging as a critical mediator connecting environmental exposures to altered gene expression in autoimmunity.
  • Global leukocyte DNA hypomethylation is observed in various autoimmune disorders, suggesting a potential role for DNAm in AITD pathogenesis.

Approach:

  • Review of current literature on DNA methylation studies in AITD patients, analyzing findings from targeted and epigenome-wide approaches.
  • Examination of differential DNA methylation in candidate genes (e.g., TNF, IFNG, IL2RA, IL6, ICAM1, PTPN22) and their potential roles in AITD.
  • Analysis of recent epigenome-wide association studies (EWAS) identifying differentially methylated positions in immunoregulatory genes (e.g., NOTCH1, HLA-DRB1).

Key Points:

  • Targeted DNAm studies reveal altered methylation in genes implicated in AITD, though findings often require replication and functional validation.
  • Thyroid hormone levels can influence DNAm, necessitating consideration of reverse causation in study designs.
  • Iodine status correlates with DNAm patterns in candidate genes (e.g., ITGA6, PRKAA2, DAPK1), suggesting a mechanism for iodine's association with AITD.
  • Genome-wide studies highlight differentially methylated positions in key immunoregulatory genes, advancing understanding beyond candidate gene approaches.

Conclusions:

  • DNA methylation plays a significant role in the pathogenesis of autoimmune thyroid disease, influenced by genetic and environmental factors.
  • Current research highlights potential diagnostic and prognostic biomarkers, as well as therapeutic targets, within DNAm patterns in AITD.
  • Large-scale, epigenome-wide studies are essential to fully elucidate the pathophysiological significance of DNAm in AITD and translate findings into clinical applications.