Harnessing Deaminated DNA to Modulate mRNA Translation for Controlled and Sequential Protein Expression

Area of Science:

• Biotechnology
• Molecular Biology
• Drug Delivery

Background:

• Messenger RNA (mRNA) holds significant promise for vaccines and therapeutics.
• Current research primarily focuses on increasing protein expression, neglecting control over translation kinetics.
• Rapid antigen release from mRNA can risk immune overstimulation and adverse effects.

Purpose of the Study:

• To develop a method for precisely controlling mRNA translation rates and timing.
• To enhance the safety and personalization of mRNA-based therapies.
• To explore the use of modified DNA as a biocompatible regulator for mRNA translation.

Main Methods:

• Utilized deoxyuridine-containing DNA hybridized to the 5 -end of mRNA to inhibit translation initiation.
• Employed base excision repair (BER) to displace the DNA, enabling controlled protein expression.
• Varied DNA strand lengths to modulate translation rate and onset.

Main Results:

• Demonstrated that DNA hybridization effectively inhibits mRNA translation initiation.
• Showcased that DNA strand length dictates translation kinetics; a 52-nt DNA strand resulted in a 20-fold slower expression with a 200-min delay.
• Enabled sequential expression of multiple mRNAs from a single cocktail.
• Confirmed the strategy requires no mRNA chemical modification and produces no toxic byproducts, only recyclable DNA fragments.

Conclusions:

• Developed a broadly applicable and biocompatible strategy using DNA to control mRNA translation.
• This method offers precise regulation of protein expression kinetics, crucial for safe and personalized mRNA therapies.
• The DNA-based approach is non-toxic and allows for sequential gene expression, expanding the utility of mRNA technology.