Circular RNAs Biogenesis in Eukaryotes Through Self-Cleaving Hammerhead Ribozymes

Area of Science:

• Molecular Biology
• Genomics
• RNA Biology

Background:

• Circular RNAs (circRNAs) are expressed in eukaryotes, primarily via backsplicing, and have diverse biological functions.
• A previously unknown, highly efficient pathway for circRNA biogenesis has been identified.

Purpose of the Study:

• To characterize a novel pathway for circRNA expression involving hammerhead ribozymes.
• To explore the nature and potential roles of these newly discovered circRNAs.

Main Methods:

• Investigation of a natural, in vivo expression pathway for circRNAs.
• Analysis of small non-coding RNA circles (100-1000 nt) generated by ribozyme activity.

Main Results:

• Identification of a second natural pathway for abundant circRNA production in eukaryotes.
• These circRNAs are generated via hammerhead ribozyme participation.
• These circRNAs represent a new family of small, nonautonomous retrotransposable elements (retrozymes).

Conclusions:

• Hammerhead ribozyme-mediated circRNAs (retrozymes) represent a significant discovery in RNA biology.
• These findings provide functional insights into the evolution of circular RNA molecules.
• Retrozymes offer potential new biotechnological tools in the field of RNA research.