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Single vector non-leaky gene expression system for Drosophila melanogaster.

Arslan Akmammedov1, Marco Geigges1, Renato Paro2,3

  • 1Department of Biosystems Science and Engineering, Federal Institute of Technology Zürich, Mattenstrasse 26, 4058, Basel, Switzerland.

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Summary

We developed PRExpress, a novel transgenic gene expression system for Drosophila. This non-leaky, inducible, and reversible system utilizes endogenous components for robust transgene control.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Existing transgenic gene expression systems in Drosophila often suffer from leakiness and impose a significant physiological burden.
  • Achieving precise control over transgene expression, including inducibility and reversibility, remains a challenge.

Purpose of the Study:

  • To develop a new, non-leaky, and tightly regulated transgenic gene expression system for Drosophila.
  • To create a user-friendly system that minimizes physiological burden and allows for rapid, strong, and reversible induction.

Main Methods:

  • Designed PRExpress, a single transgenic construct integrating the inducible hsp70 promoter with a multimerized Polycomb response element (PRE).
  • Utilized epigenetic chromatin regulators of the Polycomb group to control gene expression.
  • Employed site-specific integration for construct delivery to enhance user-friendliness.

Main Results:

  • Demonstrated that the PRExpress system is non-leaky, ensuring transgene expression only upon induction.
  • Showcased rapid and strong inducibility of transgene expression.
  • Confirmed the reversibility of the system, allowing for controlled shut-off of gene expression.

Conclusions:

  • PRExpress offers a robust solution for non-leaky and inducible transgene expression in Drosophila.
  • The system's reliance on endogenous components and site-specific integration makes it a valuable and user-friendly tool for genetic research.