Work

Transactivation Domains Facilitate Promoter Occupancy for the Dioxin-Inducible CYP1A1 Gene In Vivo

Year: 1997

Type: article

Abstract: We have studied the transcriptional regulation of the dioxin-inducible mouse CYP1A1 gene in its native chromosomal setting. We analyzed the ability of aromatic hydrocarbon receptor (AhR) mutants and AhR chimeras to restore dioxin responsiveness to the CYP1A1 gene in AhR-defective mouse hepatoma cells. Our data reveal that transactivation domains in AhR's C-terminal half mediate occupancy of the nuclear factor 1 site and TATA box for the CYP1A1 promoter in vivo. Transactivation domains of VP16 and AhR nuclear translocator, but not Sp1, can substitute for AhR's C-terminal half in facilitating protein binding at the promoter. Our data also reveal an apparent linear relationship between promoter occupancy and CYP1A1 gene expression in chromatin. These findings provide new insights into the in vivo mechanism of transcriptional activation for an interesting mammalian gene.

Source: Molecular and Cellular Biology

DOI: 10.1128/mcb.17.7.3497

Authors: Hyunsung P. Ko, Steven T. Okino, Qiang Ma, James P. Whitlock

Institutions: Stanford Medicine, Stanford University

Language: English

Topic: Toxic Organic Pollutants Impact

Subfield: Health, Toxicology and Mutagenesis

Field: Environmental Science

Domain: Physical Sciences

Open Access status: bronze

Funder: National Cancer Institute

Award: G410209951