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Aryl hydrocarbon receptor (AhR)-mediated reporter gene expression systems in transgenic tobacco plants

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Abstract

In mammals, the aryl hydrocarbon receptor (AhR) mediates expression of certain genes, including CYP1A1, in response to exposure to dioxins and related compounds. We have constructed a mouse AhR-mediated gene expression systems for a β-glucuronidase (GUS) reporter gene consisting of an AhR, an AhR nuclear translocator (Arnt), and a xenobiotic response element (XRE)-driven promoter in transgenic tobacco plants. On treatment with the AhR ligands 3-methylcholanthrene (MC), β-naphthoflavone (βNF), and indigo, the transgenic tobacco plants exhibited enhanced GUS activity, presumably by inducible expression of the reporter gene. The recombinant AhR (AhRV), with the activation domain replaced by that of the Herpes simplex virus protein VP16, induced GUS activity much more than the wild-type AhR in the transgenic tobacco plants. Plants carrying AhRV expressed the GUS reporter gene in a dose- and time-dependent manner when treated with MC; GUS activity was detected at 5 nM MC on solid medium and at 12 h after soaking in 25 μM MC. Histochemical GUS staining showed that this system was active mainly in leaf and stem. These results suggest that the AhR-mediated reporter gene expression system has potential for the bioassay of dioxins in the environment and as a novel gene expression system in plants.

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Abbreviations

AhR:

Aryl hydrocarbon receptor

Arnt:

AhR nuclear translocator

CYP1A1:

Cytochrome P450 1A1

GUS:

β-Glucuronidase

Hsp90:

90-kDa Heat shock protein

IMM:

Immunophilin-like protein

MC:

3-Methylcholanthrene

MS:

Murashige and Skoog

4MU:

4-Methyl-umbelliferone

4MUG:

4-Methyl-umbelliferyl-β-d-glucuronide

βNF:

β-Naphthoflavone

Nos-T:

Nos terminator

PCB:

Polychlorinated biphenyl

PCDF:

Polychlorinated dibenzofuran

PCDD:

Polychlorinated dibenzo-p-dioxin

POP:

Persistent organic pollutant

35-S:

CaMV35S promoter

35Sm-P:

−60/+8 minimal CaMV35S promoter

TAD:

Transactivation domain

X-Gluc:

5-Bromo-4-chloro-3-indolyl-β-d-glucuronide

XRE:

Xenobiotic respons element

XRE-P:

XRE-driven promoter

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Acknowledgments

This work was supported by the Bio-oriented Technology Research Advancement Institution (BRAIN), Tokyo, Japan.

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Correspondence to Hideo Ohkawa.

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Kodama, S., Okada, K., Inui, H. et al. Aryl hydrocarbon receptor (AhR)-mediated reporter gene expression systems in transgenic tobacco plants. Planta 227, 37–45 (2007). https://doi.org/10.1007/s00425-007-0592-1

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