Poly(A) Tail Characterization via RNase T1 Segmentation

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Solution Overview

Problem

Current methods for characterizing messenger RNA (mRNA) and polyadenylation are limited by low resolution, sample requirements, and the need for reverse transcription, making them unsuitable for quality control in Good Manufacturing Practice (GMP) settings and release testing of mRNA drug substances.

Innovation Solution

The method involves treating mRNA with RNase T1 to remove coding regions, incubating with oligo-dT beads, eluting the polyadenylated region, removing residual salts, and analyzing using capillary gel electrophoresis (CGE) with a UV detector, allowing for high-resolution, direct measurement of poly(A) tail length and distribution without the need for reverse transcription.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If current methods (IP-RP-HPLC, PCR-based PAT) are used to characterize poly(A) tails, then poly(A) tail length can be measured, but the resolution is low and sample requirements are high

Engineering Contradiction:

Improvepoly(A) tail length measurement resolutionVSAvoidsample requirement amount

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts and isolates the poly(A) tail from the complete mRNA molecule using oligo(dT) beads that specifically bind to the poly(A) sequence. This extraction allows for focused analysis of only the poly(A) region, improving measurement resolution while reducing the amount of total mRNA sample needed for characterization

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the mRNA molecule by enzymatically removing the coding region with RNase T1, separating it from the poly(A) tail. This segmentation enables independent characterization of the poly(A) tail with high resolution using capillary gel electrophoresis, while minimizing the sample quantity required for accurate measurement

Inventive Principle:

Principle #1Segmentation

2Productivity

If current methods are used for quality control in GMP settings, then poly(A) analysis can be performed, but the process requires reverse transcription which adds complexity and time

Engineering Contradiction:

ImprovemRNA analysis efficiencyVSAvoidmethodology complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent eliminates the reverse transcription step by directly analyzing the poly(A) tail in its native RNA form. By extracting the poly(A) sequence using oligo(dT) beads and analyzing it with capillary gel electrophoresis, the method simplifies the workflow, reduces time requirements, and lowers methodological complexity while maintaining high productivity for GMP quality control

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the biochemical reverse transcription process with a physical separation and detection approach using capillary gel electrophoresis. This substitution eliminates the need for enzymes, temperature cycling, and complex reagent handling, thereby reducing device complexity and improving analysis efficiency

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach provides high-resolution characterization of poly(A) tails with low sample requirements, facilitating quality control and release testing of mRNA-based therapeutics by enabling direct measurement of poly(A) tail length and distribution, improving the accuracy and efficiency of mRNA analysis.

Implementation Method 1

treating the mRNA sample with RNase T1 to remove the coding region and allow the polyadenylated region to remain

Methodology Applied

Scientific EffectEnzymatic degradation: Enzyme

Implementation Method 2

incubating the RNase T1 treated sample with oligo-dT beads

Methodology Applied

Scientific EffectNucleic acid hybridization: Absorption (physical)

Implementation Method 3

analyzing the polyadenylated region after removing the residual salts from the elution of the polyadenylated region bound to the oligo-dT beads using capillary gel electrophoresis (CGE)

Methodology Applied

Scientific EffectGel electrophoresis: Electrophoresis

Implementation Method 4

analyzing using capillary gel electrophoresis (CGE) with a UV detector

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Data Source

PatentUS20250002992A1Methods of analyzing and characterizing polyadenylation on messenger ribonucleic acid

Publication Date: 2025.01.02 REGENERON PHARMACEUTICALS INC

AI summary

The inventions provide methods for characterizing messenger RNAs (mRNA) and polyadenylation on mRNAs. The disclosed inventions are developed for characterizing mRNA and poly(A) tail length on mRNA samples. These inventions can be used in release testing of mRNA drug substrate (DS) or drug product (DP), and can provide direct read-out of mRNA integrity and poly(A) tail length. The inventions further provide methods of analyzing the condition of mRNAs in samples. Characterized mRNA samples obtained by all of the inventive methods also are part of the inventions disclosed herein.