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Mol Cell Biol. 1990 June; 10(6): 2774-2786

Developmental regulation of topoisomerase II sites and DNase I-hypersensitive sites in the chicken beta-globin locus.

Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

ABSTRACT

We have mapped DNase I-hypersensitive sites and topoisomerase II (topo II) sites in the chicken beta-globin locus, which contains four globin genes (5'-rho-beta H-beta A-epsilon-3'). In the 65 kilobases (kb) mapped, 12 strong hypersensitive sites were found clustered within the 25-kb region from 10 kb upstream of rho to just downstream of epsilon. The strong sites were grouped into several classes based on their tissue distribution, developmental pattern, and location. (i) One site was present in all cells examined, both erythroid and nonerythroid. (ii) Three sites, located upstream of the rho-globin gene, were present at every stage of erythroid development, but were absent from nonerythroid cells. (iii) Four sites at the 5' ends of each of the four globin genes were hypersensitive only in the subset of erythroid cells that were transcribing or had recently transcribed the associated gene. (iv) Another three sites, whose pattern of hypersensitivity also correlated with expression of the associated gene, were found 3' of rho, beta H, and epsilon. (v) A site 3' of beta A and 5' of epsilon was erythroid cell specific and present at all developmental stages, presumably reflecting the activity of this enhancer throughout erythroid development. We also mapped the topo II sites in this locus, as determined by teniposide-induced DNA cleavage. All strong teniposide-induced cleavages occurred at DNase I-hypersensitive sites, while lesser amounts of cleavage were observed in transcribed regions of DNA. Most but not all of the DNase I-hypersensitive sites were topo II sites. These data are consistent with the hypothesis that, in vivo, topo II preferentially acts on nucleosome-free regions of DNA but suggest that additional topo II regulatory mechanisms must exist.

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