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Related Experiment Videos

Gene inactivation by multiphoton-targeted photochemistry.

M W Berns1, Z Wang, A Dunn

  • 1Beckman Laser Institute and Medical Clinic and Center for Biomedical Engineering, University of California, Irvine 92612-1475, USA. mberns@bli.uci.edu

Proceedings of the National Academy of Sciences of the United States of America
|August 16, 2000
PubMed
Summary

Multiphoton-targeted photochemistry precisely inactivates gene expression in vertebrate cells. This method uses a laser and photosensitizing dye to target specific gene sites on chromosomes, impacting cell development.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biotechnology

Background:

  • Gene expression regulation is crucial for cellular function and development.
  • Targeted gene manipulation is essential for understanding gene function and disease.
  • Existing methods for gene inactivation may lack precision or specificity.

Purpose of the Study:

  • To develop and demonstrate a method for selective gene inactivation in vertebrate cells.
  • To utilize multiphoton microscopy for precise targeting of specific gene loci.
  • To assess the efficacy of targeted photochemistry in reducing gene expression.

Main Methods:

  • Employing multiphoton-targeted photochemistry with a photosensitizing dye (ethidium bromide monoacetate).
  • Using a pulsed infrared laser to focus on specific regions of mitotic chromosomes, targeting nucleolar (ribosomal) genes.

Related Experiment Videos

  • Tracking individual cells through mitosis to observe the effects of gene site irradiation on daughter cells.

    • Main Results:

    • Selective reduction in nucleoli formation in daughter cells, correlating with the number of targeted nucleolar gene sites.
    • Demonstrated precise gene inactivation at the chromosomal level using focal point specificity.
    • Validated the ability to manipulate gene expression through targeted photochemistry.

    Conclusions:

    • Multiphoton-targeted photochemistry offers a highly specific method for gene inactivation in vertebrate cells.
    • The technique leverages the precision of multiphoton microscopy for targeted genetic manipulation.
    • This approach holds significant potential for biotechnology applications, both in vitro and in vivo.