Ligand-induced sequestering of branchpoint sequence allows conditional control of splicing

Area of Science:

• Molecular Biology
• Gene Regulation
• RNA Biology

Background:

• Understanding gene expression regulation is crucial, yet controlling splicing remains challenging.
• Alternative splicing plays a significant role in gene expression pathways.
• Current methods for deliberate regulation of gene expression at the splicing level are limited.

Purpose of the Study:

• To investigate the potential of a theophylline-dependent splice switch.
• To determine if sequestering the branchpoint sequence (BPS) within an RNA-theophylline complex can regulate alternative splicing.

Main Methods:

• Construction of pre-messenger RNA (pre-mRNA) with BPS inserted into a theophylline aptamer.
• In vitro and in vivo assays to assess splicing inhibition.
• Analysis of dose-dependent effects and specificity of theophylline-induced splicing modulation.
• Development of an alternative splicing model substrate.

Main Results:

• Theophylline-induced sequestering of BPS effectively inhibits pre-mRNA splicing both in vitro and in vivo.
• Splicing inhibition is dose-dependent and highly specific.
• Thermodynamic stability of the RNA-theophylline complex and BPS location influence splicing inhibition efficiency.
• Theophylline triggers exon skipping in an alternative splicing model, demonstrating small molecule-RNA interaction's regulatory potential.

Conclusions:

• Demonstrated a novel method to control alternative splicing patterns using a small molecule-inducible system.
• Findings offer a powerful tool for regulating gene expression at the splicing level.
• Implications for basic, biotechnological, and biomedical research fields.