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Updated: Jan 13, 2026

Phenotypic and Functional Analysis of Activated Regulatory T Cells Isolated from Chronic Lymphocytic Choriomeningitis Virus-infected Mice
Published on: June 22, 2016
Epigenetic Modulation of IL-7 and IL-10: Toward Personalized Immune Therapies in Viral Epidemics
Zerrin Yulugkural1, Mustafa Yildiz2, Ertugrul Topcu1
1Department of Infectious Diseases and Clinical Microbiology, Trakya University, Edirne, Türkiye, trakya.edu.tr.
Background:
Host immune responses, including cytokine production, shape the severity of viral epidemics. Epigenetic mechanisms such as DNA methylation regulate cytokine gene expression and may contribute to immune dysregulation in severe disease.
Methods:
This study analyzed interleukin-7 (IL-7), IL-8, and IL-10 promoter methylation in 145 COVID-19 patients (91 wards, 54 intensive care units (ICUs)), excluding 12 patients receiving epigenetically active drugs. Peripheral blood DNA underwent bisulfite conversion, followed by PCR and gel electrophoresis. Gene-specific methylation levels were quantified using beta values.
Results:
IL-7 was significantly hypermethylated overall (β = 0.835, p < 0.001), especially in ICU patients (β = 0.863, p = 0.001), independent of age, mortality, and malignancy. An interaction between age and ICU status indicated group-specific effects. IL-10 showed significant hypomethylation (β = 0.243, p < 0.001), while IL-8 methylation did not differ significantly (p = 0.373). ICU patients had higher mortality (26% vs 5.5%, p < 0.001).
Conclusion:
IL-7 hypermethylation may impair T-cell-mediated immunity in severe cases, while IL-10 hypomethylation may reflect enhanced immunosuppression. These findings suggest a role for epigenetic cytokine regulation in disease progression and may guide future immunomodulatory strategies.
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