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• W2030475456 startingPage "961" @default.
• W2030475456 abstract "Studying the chicken α-globin domain as a model system of gene regulation, we have previously identified contiguous silencer-enhancer elements located on the 3′-side of the domain. To better characterize the enhancer we performed a systematic functional analysis to define its expression influence range and the ubiquitous and stage-specific transcriptional regulators interacting with this control element. In contrast to previous reports, we found that, in addition to a core element that includes three GATA-1 binding sites, the enhancer incorporates a 120 base-pair DNA fragment where EKLF, NF-E2 and a fourth GATA-1 factor could interact. Functional experiments demonstrate that the enhancer activity over the adult αD promoter is differentially regulated. We found that the transcriptional factor Ying Yang 1 (YY1) binds to the 120 base-pair DNA fragment and its effect over the enhancer activity is GATA-1-dependent. In addition, we characterize a novel physical interaction between GATA-1 and YY1 that influences the enhancer function. Experiments using a histone deacetylation inhibitor indicate that, in pre-erythroblasts, the enhancer down-regulation could be influenced by a closed chromatin conformation. Our observations show that the originally defined enhancer possesses a more complex composition than previously assumed. We propose that its activity is modulated through differential nuclear factor interactions and chromatin modifications at distinct erythroid stages." @default.
• W2030475456 created "2016-06-24" @default.
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• W2030475456 date "2005-06-01" @default.
• W2030475456 modified "2023-10-18" @default.
• W2030475456 title "YY1 and GATA-1 Interaction Modulate the Chicken 3′-Side α-Globin Enhancer Activity" @default.
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• W2030475456 doi "https://doi.org/10.1016/j.jmb.2005.04.040" @default.
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