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. 1986 Jul;6(7):2576–2581. doi: 10.1128/mcb.6.7.2576

Alternative inducers of the rat metallothionein I gene cause distinct changes in chromatin structure in the 5' region of the gene.

S J Taplitz, K L Calame, H R Herschman
PMCID: PMC367813  PMID: 3785203

Abstract

We examined the chromatin structure of the rat metallothionein I gene, both in uninduced cells and in cells induced by heavy metals or dexamethasone, using hypersensitivity to DNase I as an assay. The metallothionein I gene of the H4IIE rat hepatoma cell line, expressed at basal level, has a single DNase I-hypersensitive site. This site maps between putative hormone and basal level control sequences. Induction of the gene by cadmium or zinc resulted in the appearance of a new hypersensitive site near the start site of transcription, in a region near the metal-regulatory elements. In contrast, induction of the metallothionein I gene by dexamethasone did not alter the basal pattern of hypersensitivity. Thus, different mechanisms of induction of metallothionein transcription lead to distinct alterations in the chromatin containing the 5' sequences regulating the expression of this gene.

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