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. 1993 Oct 11;21(20):4824–4829. doi: 10.1093/nar/21.20.4824

In vivo footprinting of the human IL-2 gene reveals a nuclear factor bound to the transcription start site in T cells.

M W Brunvand 1, A Krumm 1, M Groudine 1
PMCID: PMC331512  PMID: 8233832

Abstract

The IL-2 gene is a T cell specific gene that is expressed early during the activation-specific T lymphocyte development program. Electrophoretic mobility shift assay (EMSA) and DNase I footprinting assays have defined DNA/protein interactions at the IL-2 promoter cis-elements in vitro. To determine if the trans-activators documented in T cell nuclear extracts actually bind the IL-2 promoter in vivo, ligation mediated PCR (LMPCR) genomic footprinting was performed on the IL-2 promoter in both activated and non-activated T cells and HL60 promyelocytes, which do not express the IL-2 gene. The in vivo footprints indicate that the IL-2 gene transcription start site and TATA sequence are protected in both activated and resting T cells, prior to the appearance of detectable IL-2 steady state message. The distal NF-AT and the NF kappa B sites are each footprinted and the Oct/OAP site contains hypersensitive residues in the unstimulated T lymphocytes. Additional residues are protected in each of these sites after T cell activation. The proximal NF-AT site (NF-IL-2B) and the AP-1 site at -150 are protected in activated Jurkat T lymphocytes, but these two sites are not protected in activated Jurkat lymphocytes stably transfected a gene construct containing multiple NFAT binding sites.

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Selected References

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