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Related Experiment Videos

Copper-controllable gene expression system for whole plants

V L Mett1, L P Lochhead, P H Reynolds

  • 1Plant Improvement Division, Horticulture and Food Research Institute of New Zealand, Palmerston North.

Proceedings of the National Academy of Sciences of the United States of America
|May 15, 1993
PubMed
Summary

We developed a novel gene expression system in plants using yeast metallothionein regulation. This system precisely controls gene expression in response to copper ion concentrations, enabling timed experiments.

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Area of Science:

  • Plant Biotechnology
  • Molecular Biology
  • Gene Regulation

Background:

  • Metallothionein (MT) genes in yeast regulate metal ion homeostasis.
  • The ACE1 transcription factor controls yeast MT gene expression.
  • Cauliflower Mosaic Virus (CaMV) 35S RNA promoter is widely used in plant gene expression.

Purpose of the Study:

  • To engineer a novel, copper-inducible gene expression system in plants.
  • To adapt the yeast metallothionein gene regulation mechanism for plant applications.
  • To achieve precise temporal control of gene expression in transgenic plants.

Main Methods:

  • Constructed a chimeric promoter combining CaMV 35S promoter domain A with ACE1 binding sites.
  • Introduced the chimeric promoter-driven beta-glucuronidase (GUS) reporter gene into tobacco plants.

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  • Analyzed GUS activity in transgenic plants under varying copper ion concentrations.

    • Main Results:

    • The chimeric promoter demonstrated copper-dependent gene activation in transgenic tobacco.
    • GUS reporter gene expression increased up to 50-fold with copper sulfate (CuSO4) addition.
    • Gene expression was repressed upon removal of copper ions, showing reversibility.

    Conclusions:

    • The developed system provides a robust method for copper-regulated gene expression in plants.
    • This technology allows for precise temporal control of gene expression, valuable for experimental design.
    • The system leverages yeast gene regulation mechanisms for plant biotechnology applications.