Controlling In Vitro mRNA Polyadenylation by Monitoring Poly(A) Polymerase Consumption of ATP

Area of Science:

• Molecular Biology
• Biochemistry
• Biotechnology

Background:

• The poly(A) tail is crucial for mRNA stability, translation, and immunogenicity.
• Current in vitro transcribed (IVT) mRNA production methods yield short poly(A) tails (50-120 nt) due to template limitations.
• Post-transcriptional enzymatic polyadenylation offers a way to increase poly(A) tail length but lacks real-time control.

Purpose of the Study:

• To develop a methodology for controlling poly(A) tail length during post-transcriptional mRNA polyadenylation.
• To establish a real-time monitoring strategy for enzymatic polyadenylation processes.
• To produce and validate longer poly(A) tailed mRNAs for improved cellular function.

Main Methods:

• Developed a method using adenosine triphosphate (ATP) consumption as an at-line metric to predict poly(A) tail length.
• Employed monolith reverse-phase chromatography for accurate validation of predicted poly(A) tail lengths.
• Produced reporter mRNAs with controlled poly(A) tail lengths ranging from 300 to 700 nucleotides.

Main Results:

• Successfully controlled and accurately determined poly(A) tail lengths in the 300-700 nt range.
• Demonstrated that longer poly(A) tailed mRNAs exhibited superior performance in cell-based assays compared to shorter or uncapped/untailed controls.
• Validated the predictive power of ATP consumption for monitoring poly(A) tail elongation.

Conclusions:

• Introduced a novel strategy for controlled post-transcriptional polyadenylation of mRNA.
• Utilized ATP consumption as a process control metric for enzymatic mRNA modification.
• This approach holds potential for broader application in mRNA production and other nucleotide-dependent enzymatic processes.