Abstract
Purpose
Protein tyrosine phosphatase non-receptor type 22 (PTPN22) is an inhibitor of T-cell activation, regulating intracellular signal transduction and thereby being implicated in the pathogenesis of autoimmune thyroid disease (AITD). The exact molecular mechanisms have not been fully elucidated. The aim of the present study was to quantitate DNA methylation within the PTPN22 gene promoter in children and adolescents with AITD and healthy controls.
Methods
60 Patients with Hashimoto thyroiditis (HT), 25 patients with HT and type 1 diabetes (HT + T1D), 9 patients with Graves’ disease (GD) and 55 healthy controls without any individual or family history of autoimmune disease were enrolled. Whole blood DNA extraction, DNA modification using sodium bisulfate and quantification of DNA methylation in the PTPN22 gene promoter, based on melting curve analysis of the selected DNA fragment using a Real-Time PCR assay, were implemented.
Results
DNA methylation in the PTPN22 gene promoter was found to be significantly higher in HT patients (39.9 ± 3.1%) in comparison with other study groups (20.3 ± 2.4% for HT + T1D, 32.6 ± 7.8% for GD, 27.1 ± 2.4% for controls, p < 0.001). PTPN22 gene promoter DNA methylation was also associated marginally with thyroid autoimmunity in general (p = 0.059), as well as considerably with thyroid volume (p = 0.004) and the presence of goiter (p = 0.001) but not thyroid function tests.
Conclusions
This study demonstrates for the first time that a relationship between autoimmune thyroiditis and PTPN22 gene promoter DNA methylation state is present, thus proposing another possible etiological association between thyroiditis and abnormalities of PTPN22 function. Further expression studies are required to confirm these findings.
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Data availability
The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.
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This study was supported by the Research Committee of the Aristotle University of Thessaloniki (Grant Number 89650).
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IK, GT and AGT conceived and designed the study. IK and SG performed collection of samples and clinical data. IK and AF performed laboratory analyses. IK and AF analyzed and interpreted the data. IK and SG drafted the manuscript. AF, GT and AGT revised it critically for important intellectual content. All authors read and approved the final manuscript.
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All procedures performed in studies involving human participants were in accordance with the Ethical Standards of the Institutional and/or National Research Committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Bioethics Committee of the Medical School of the Aristotle University of Thessaloniki (No. 62/17-2-2014).
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Kyrgios, I., Giza, S., Fragou, A. et al. DNA hypermethylation of PTPN22 gene promoter in children and adolescents with Hashimoto thyroiditis. J Endocrinol Invest 44, 2131–2138 (2021). https://doi.org/10.1007/s40618-020-01463-7
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DOI: https://doi.org/10.1007/s40618-020-01463-7