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• W2782832103 abstract "Background: Dysregulated DNA methylation in lymphocytes has been linked to autoimmune disorders. The aims of this study were to identify global DNA methylation patterns in patients with autoimmune thyroid diseases and to observe methylation changes after treatment for these conditions. Methods: A cross-sectional study was conducted, including the following patients: 51 with newly diagnosed Graves' disease (GD), 28 with autoimmune hypothyroidism (AIT), 29 with positive thyroid autoantibodies, and 39 matched healthy volunteers. Forty GD patients treated with radioiodine or antithyroid drugs and 28 AIT patients treated with L-thyroxine were followed for three months. Serum free triiodothyronine, free thyroxine, thyrotropin, thyroid peroxidase antibodies, thyroglobulin antibodies, and thyrotropin receptor antibodies were assayed using electrochemiluminescent immunoassays. CD3+ T and CD19+ B cells were separated by flow cytometry for total DNA and RNA extraction. Global DNA methylation levels were determined by absorptiometry using a methylation quantification kit. DNA methyltransferase (DNMT) expression levels were detected by real-time polymerase chain reaction. Results: Hypomethylation and down-regulated DNMT1 expression in T and B lymphocytes were observed in the newly diagnosed GD patients. Neither the AIT patients nor the positive thyroid autoantibodies patients exhibited differences in their global DNA methylation status or DNMT mRNA levels compared with healthy controls. Antithyroid drugs restored global methylation and DNMT1 expression in both T and B lymphocytes, whereas radioiodine therapy affected only T cells. L-thyroxine replacement did not alter the methylation or DNMT expression levels in lymphocytes. The global methylation levels of B cells were negatively correlated with the serum thyroid peroxidase antibodies in patients with autoimmune thyroid diseases. Conclusions: Hyperthyroid patients with newly diagnosed GD had global hypomethylation and lower DNMT1 expression in T and B lymphocytes. The results provide the first demonstration that antithyroid drugs or radioiodine treatment restore global DNA methylation and DNMT1 expression with concurrent relief of hyperthyroidism." @default.
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• W2782832103 date "2018-03-01" @default.
• W2782832103 modified "2023-09-26" @default.
• W2782832103 title "Alterations of Global DNA Methylation and DNA Methyltransferase Expression in T and B Lymphocytes from Patients with Newly Diagnosed Autoimmune Thyroid Diseases After Treatment: A Follow-Up Study" @default.
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• W2782832103 doi "https://doi.org/10.1089/thy.2017.0301" @default.
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