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Onecut transcription factor OC2 is a direct target of T-bet in type-1 T-helper cells

Abstract

T-box transcription factor, T-bet, has a central role in the differentiation of T-helper (Th) progenitor cells to Th1 or Th2 effector cells, partly by regulating the expression of genes such as interferon-γ (IFN-γ). However, the direct target genes, especially those mediating the transcriptional network initiated by T-bet, are not yet fully understood. By combining chromatin immunoprecipitation from Th1 cells with human cytosine-phosphate-guanine-island array analysis, Onecut 2 (OC2), which encodes a member of the ONECUT class of transcriptional activators, was identified as a direct target gene of T-bet. OC2 is expressed in Th1 but not Th2 cells and reporter assays showed that T-bet transactivates OC2 transcription through putative T-bet half-sites locating −451 to −347 of OC2 promoter region. Moreover, we found that OC2 binds and transactivates human T-bet promoter. These results suggest that not only cell-extrinsic regulation via the IFN-γ/STAT1 pathway, but also cell-intrinsic transcriptional positive feedback loop between T-bet and OC2 could be involved in Th1 development.

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Acknowledgements

We thank T Tanaka, T Akinaga, M Goto and M Ohnish for technical help. This work was supported by a Grant-in-Aid for Scientific Research in the priority area of Genome Biology, and by a grant from the 21st Center of Excellence Program from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Correspondence to K Yamamoto.

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Supplementary Information accompanies the paper on Genes and Immunity website (http://www.nature.com/gene)

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Furuno, K., Ikeda, K., Hamano, S. et al. Onecut transcription factor OC2 is a direct target of T-bet in type-1 T-helper cells. Genes Immun 9, 302–308 (2008). https://doi.org/10.1038/gene.2008.18

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