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. 1990 Dec;87(23):9300–9304. doi: 10.1073/pnas.87.23.9300

Glucocorticoids locally disrupt an array of positioned nucleosomes on the rat tyrosine aminotransferase promoter in hepatoma cells.

K D Carr 1, H Richard-Foy 1
PMCID: PMC55152  PMID: 1979170

Abstract

Transcriptional activation by steroid hormones is often associated with the appearance of a DNase I hypersensitive site resulting from a local alteration of the nucleoprotein structure of the promoter. For the mouse mammary tumor virus long terminal repeat, a viral promoter under glucocorticoid control, a model has been proposed: the appearance of the hormonodependent DNase I hypersensitive site reflects the displacement of a single precisely positioned nucleosome associated with the glucocorticoid responsive elements. To determine if such a mechanism is of general relevance in transcriptional activation by steroid hormones, we have investigated the nucleosomal organization of the rat tyrosine aminotransferase promoter over a 1-kilobase region that contains the glucocorticoid regulatory target. This region displays a hormonodependent DNase I hypersensitive site. In the absence of hormone, micrococcal nuclease digestion of nuclei demonstrates the presence of positioned nucleosomes, with cutting sites centered around positions -3080, -2900, -2700, -2800, -2255, and -2040. Treatment of the cells with dexamethasone induces a disruption of the chromatin structure over a relatively short stretch of DNA (approximately positions -2400 to -2650) that overlaps two nucleosomes. These observations suggest a strong similarity in the role of chromatin structure in glucocorticoid-dependent transcriptional activation of mouse mammary tumor virus and tyrosine aminotransferase promoters.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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