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. 1986 Dec 22;14(24):9827–9841. doi: 10.1093/nar/14.24.9827

DNase I hypersensitivity and methylation of the 5'-flanking region of the alpha 1-fetoprotein gene during developmental and glucocorticoid-induced repression of its activity in rat liver.

B Turcotte, M Guertin, M Chevrette, H LaRue, L Bélanger
PMCID: PMC341338  PMID: 2433681

Abstract

Three major regions of DNase I hypersensitivity (DH) were found in alpha 1-fetoprotein (AFP) chromatin of rat liver. DH site I is located at the transcription initiation site and associated with ongoing AFP transcription. DH site II is located 2.5 kb upstream from the cap site: it is developmental stage-dependent but dissociable from ongoing AFP transcription. DH site III, 3.7 kb upstream from the cap site, behaves as hepatocyte-constitutive. DH sites are present in similar regions of liver albumin chromatin. Dexamethasone-induced AFP gene repression is accompanied by the selective loss of AFP DH site I, a likely result of glucocorticoid receptors binding to a DNA recognition sequence located 5'-adjacent to DH site I. Sl nuclease-hypersensitive sites were found on naked superhelical AFP and albumin DNA, but do not appear to contribute DH sites in liver chromatin. The extent of hypomethylation of HpaII sites at the 5'-end of the AFP gene correlates positively with the level of potential and actual expression of the gene. We conclude that developmental and hormonal regulation of the AFP gene is confined within congruent to 4 kb of 5'-flanking DNA, and we discuss possible hierarchical interactions among DH sites, in relation to DNA methylation and replication.

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Selected References

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