{"database":"GEO","file_versions":[{"headers":{"Content-Type":["application/json"]},"body":{"files":{"Other":["ftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE261nnn/GSE261372/"]},"type":"primary"},"statusCode":"OK","statusCodeValue":200}],"scores":null,"additional":{"omics_type":["Genomics"],"species":["Mus musculus"],"gds_type":["Genome binding/occupancy profiling by high throughput sequencing"],"full_dataset_link":["https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE261372"],"repository":["GEO"],"entry_type":["GSE"],"additional_accession":[]},"is_claimable":false,"name":"Epigenetic control of T cells by vitamin C via DNA demethylation [CutRun-TCF7TET2]","description":"Maintenance of T cell naïve (Tn) state and restricting effector T cell differentiation upon basal level stimulations would be critical for immune homeostasis and prevention of autoimmunity. To understand how Tn state is regulated by nutrient cues in a cell-intrinsic manner, here we perform an in vivo CRISPR screening to identify required solute carrier (SLC) proteins that transport metabolites and ions into T cells. Among SLC proteins revealed by this experiment, vitamin C transporter Slc23a2 appears to play a role. Conditional ablation of Slc23a2 in T cells by genetic approaches reduces intracellular vitamin C levels by approximately 80%, accompanied by spontaneous activation and differentiation of Tn cells, autoantibody production, and autoimmune pathology in select organs. Slc23a2-deficient Tn cells exhibit profound DNA hypermethylation, dysregulation of genes controlling signaling transduction and transcription, and enhanced differentiation of helper T cells upon stimulation. These results define a broad regulatory space of vitamin C as a cofactor of Tet enzymes in controlling active DNA demethylation. In agreement, conditional deletion of Tet genes impairs Tn state and increases helper T cell differentiation. Thus, our study reveals a cell-intrinsic mechanism by which micronutrient vitamin C via Slc23a2 maintains Tn state and self-tolerance by promoting Tet-mediated DNA demethylation.","dates":{"publication":"2026/05/08"},"accession":"GSE261372","cross_references":{"GSM":["GSM8141556","GSM8141566","GSM8141555","GSM8141565","GSM8141554","GSM8141564","GSM8141563","GSM8141562","GSM8141561","GSM8141560","GSM8141559","GSM8141558","GSM8141557"],"GPL":["24247"],"GSE":["261372"],"taxon":["Mus musculus"]}}