Directed Circularization of a Short RNA.

Area of Science:

• Molecular Biology
• RNA Therapeutics
• Biochemistry

Background:

• Challenges in producing circular RNA (circRNA) of specific lengths and sequences hinder basic research and functional analyses.
• Current methods for circRNA synthesis include enzymatic, ribozymatic, and splice-based approaches, but directed circularization remains limited.
• Efficient and controlled synthesis of circRNA is crucial for advancing RNA-based therapeutics and diagnostics.

Purpose of the Study:

• To present a proof of principle for an affordable and efficient RNA-based system for controlled circRNA synthesis.
• To develop a method for producing circRNA with a physiological 3",5"-phosphodiester linkage.
• To establish a controllable circRNA synthesis protocol independent of external enzymatic assistance.

Main Methods:

• Engineering a hairpin ribozyme variant, circular ribozyme 3 (CRZ-3), with poor self-cleavage activity.
• Designing an activator-polyamine complex to facilitate CRZ-3 self-cleavage.
• Utilizing the CRZ-3 system for the controlled synthesis of circRNA.

Main Results:

• Demonstrated a novel RNA-based system for the efficient synthesis of circRNA.
• Achieved controlled circRNA formation using an engineered ribozyme and an activator complex.
• Successfully produced circRNA without the need for external enzymatic support.

Conclusions:

• The developed system provides an affordable and efficient method for controlled circRNA synthesis.
• This RNA-based approach offers a controllable alternative to existing methods for circRNA production.
• The findings pave the way for improved generation of custom circRNAs for research and therapeutic applications.