Programmable initiation of mRNA translation by trans-RNA.

Area of Science:

• Molecular Biology
• Gene Expression Regulation
• RNA Therapeutics

Background:

• Gene silencing tools are common, but mRNA activation tools are scarce.
• Directing ribosomes to specific mRNA start codons without sequence alteration is challenging.

Purpose of the Study:

• To design and validate trans-RNAs for targeted mRNA translation activation.
• To enable programmable control over endogenous gene expression in vivo.
• To investigate the mechanism of ribosome-mRNA interaction mediated by trans-RNAs.

Main Methods:

• Design and synthesis of capped trans-RNAs.
• Biochemical assays to study ribosome-RNA interactions.
• In vivo experiments in mouse liver to demonstrate programmable translation.
• Analysis of natural transcripts with similar functions.

Main Results:

• Capped trans-RNAs successfully direct ribosomes to specific mRNA start codons.
• Trans-RNAs facilitate ribosome loading and scanning via alternative cap recognition.
• Programmable translation of endogenous genes and circular RNAs was achieved in vivo.
• Natural transcripts with similar mRNA translation activating functions were identified.

Conclusions:

• Capped trans-RNAs represent a novel tool for precise mRNA translation activation.
• This technology offers new possibilities for gene expression control and therapeutic applications.
• The discovery of natural trans-acting RNAs broadens our understanding of gene regulation.