期刊
FEBS JOURNAL
卷 274, 期 23, 页码 6065-6073出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1742-4658.2007.06128.x
关键词
coregulator; globin genes; locus control region; transcription
资金
- NIDDK NIH HHS [R01 DK052356, R01 DK052356-10, R01 DK052356-15A1, DK 52356] Funding Source: Medline
Upstream stimulatory factor and TFII-I are ubiquitously expressed helix-loop-helix transcription factors that interact with E-box sequences and or initiator elements. We previously demonstrated that upstream stimulatory factor is an activator of beta-globin gene expression whereas TFII-I is a repressor. In the present study, we demonstrate that upstream stimulatory factor interacts with the coactivator p300 and that this interaction is restricted to erythroid cells expressing the adult beta-globin gene. Furthermore, we demonstrate that Suz12, a component of the polycomb repressor complex 2, is recruited to the beta-globin gene. Reducing expression of Suz12 significantly activates beta-globin gene expression in an erythroid cell line with an embryonic phenotype. Suz12 also interacts with the adult beta-globin gene during early stages of erythroid differentiation of mouse embryonic stem cells. Our data suggest that TFII-I contributes to the recruitment of the polycomb repressor complex 2 complex to the beta-globin gene. Together, these data demonstrate that the antagonistic activities of upstream stimulatory factor and TFII-I on beta-globin gene expression are mediated at least in part by protein complexes that render the promoter associated chromatin accessible or inaccessible for the transcription complex.
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