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Nat Immunol. 2003 Mar;4(3):235-40. Epub 2003 Jan 27.

Selective, stable demethylation of the interleukin-2 gene enhances transcription by an active process.

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Laboratory of Cellular and Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-0420, USA.


A role for DNA demethylation in transcriptional regulation of genes expressed in differentiated somatic cells remains controversial. Here, we define a small region in the promoter-enhancer of the interleukin-2 (Il2) gene that demethylates in T lymphocytes following activation, and remains demethylated thereafter. This epigenetic change was necessary and sufficient to enhance transcription in reporter plasmids. The demethylation process started as early as 20 minutes after stimulation and was not prevented by a G1 to S phase cell cycle inhibitor that blocks DNA replication. These results imply that this demethylation process proceeds by an active enzymatic mechanism.

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