Inducible Bcl-2 gene RNA interference mediated by aptamer-integrated HDV ribozyme switch

Area of Science:

• Molecular Biology
• Gene Regulation
• Synthetic Biology

Background:

• RNA interference (RNAi) offers a powerful tool for studying gene expression dynamics.
• Controlling RNAi for temporal and dose-dependent gene modulation is crucial for biological research.
• Existing methods for regulating gene expression in mammalian cells can be further refined.

Purpose of the Study:

• To engineer a novel RNAi-regulatory device for controlling endogenous gene expression in mammalian cells.
• To utilize a hepatitis delta virus (HDV) ribozyme switch with a theophylline aptamer for inducible gene silencing.
• To demonstrate dose-dependent control of Bcl-2 gene expression using theophylline in MCF-7 cells.

Main Methods:

• Design of an RNAi-regulatory device incorporating an HDV ribozyme, theophylline aptamer, and pri-miRNA of Bcl-2.
• Integration of the engineered device into MCF-7 cells.
• Administration of theophylline to culture media to induce gene regulation.
• Monitoring of gene expression levels in response to theophylline treatment.

Main Results:

• Successful engineering of a ribozyme switch-based RNAi-regulatory device.
• Demonstration of theophylline-inducible and dose-dependent control of endogenous Bcl-2 gene expression.
• Validation of the system's efficacy in modulating gene expression in mammalian cells.

Conclusions:

• This study presents the first application of ribozyme switches to activate RNAi for modulating endogenous genes in mammalian cells.
• The developed platform enables precise control over gene expression, facilitating studies on differentiation, cell division, and cell death.
• This technology holds promise for investigating cancer-related genes and screening potential drug targets for gene therapy.