Abstract
In vitro DNAase I footprinting and gel mobility shift assays have shown that the activities of several nuclear factors (GATA-1, Sp1) that bind to the promoter and downstream enhancer regions of the chicken histone H5 gene are reduced in mature erythrocytes relative to those in immature erythrocytes. In this study we investigated site occupancy in the promoter and downstream enhancer regions of the H5 gene in mature and immature erythrocytes. The ligation-mediated polymerase chain reaction was used to detect DNAase I footprints generated in situ. Most of the sites that bound to Sp1 and/or Sp1-like proteins and GATA-1 in the promoter and enhancer were occupied in situ in mature and immature erythrocytes. However, the level of protection at Sp1/Sp1-like binding sites in the H5 enhancer region of mature erythroid cells was generally less than that observed for immature cells, suggesting that for any given mature cell not all of the Sp1/Sp1-like binding sites are occupied. Nevertheless, the results of this study suggest that the enhancer and promoter of the H5 gene in mature erythrocytes should be functional, agreeing with nuclear runon studies showing transcriptional activity of the H5 gene in mature permeabilized cells.
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Sun, JM., Ferraiuolo, R. & Davie, J.R. In situ footprinting of chicken histone H5 gene in mature and immature erythrocytes reveals common factor-binding sites. Chromosoma 104, 504–510 (1996). https://doi.org/10.1007/BF00352114
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DOI: https://doi.org/10.1007/BF00352114