Oligonucleotide Fingerprint Analysis for Mixture Verification
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Solution Overview
Problem
Current methods for post-synthetic analysis and validation of oligonucleotides, such as MALDI-TOF and ESI mass spectrometry, are limited in resolving mixtures of oligonucleotides with similar molecular weights, leading to difficulties in distinguishing between different sequences and determining their relative concentrations.
Innovation Solution
Generating a theoretical ESI trace or fingerprint and comparing it to actual ESI data to verify the accuracy of oligonucleotide synthesis, using a method that assigns signal values to discrete molecular weight ranges and combines peaks with greater than 50% overlap, allowing for graphical representation and identification of multiple data points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MALDI-TOF mass spectrometry is used to assess oligonucleotide molecular weight, then high-throughput analysis is achieved, but resolution drops rapidly above 45 bases or 13,000 Da
Solution Approach 1:
The patent combines MALDI-TOF and ESI mass spectrometry methods into a unified quality control system. MALDI-TOF provides high-throughput screening while ESI provides high-resolution analysis for longer oligonucleotides, allowing the system to leverage the strengths of both techniques simultaneously
2Measurement precision
If ESI mass spectrometry is used to analyze longer oligonucleotides, then high mass accuracy is achieved, but the method cannot distinguish between different sequences with similar molecular weights
Solution Approach 1:
The patent segments the quality control process into multiple analytical stages: initial molecular weight verification using ESI mass spectrometry, followed by sequence-specific identification using oligonucleotide array hybridization. This segmentation allows each method to perform its optimal function without being limited by its inherent drawbacks
Solution Approach 2:
The patent introduces oligonucleotide arrays as an intermediary step between mass spectrometry and final quality confirmation. The arrays provide sequence-specific information that complements the mass-to-charge ratio data, enabling differentiation of oligonucleotides with identical or similar molecular weights
3Ease of operation
If only molecular weight comparison is used for quality control, then simple assessment is achieved, but sequences with same molecular weight become indistinguishable
Solution Approach 1:
The patent adds a new dimension to quality control by incorporating sequence-specific hybridization data alongside molecular weight information. This transforms the assessment from a one-dimensional molecular weight comparison to a two-dimensional analysis that includes both mass-to-charge ratio and sequence complementarity, enabling differentiation of previously indistinguishable sequences
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 enables accurate verification of oligonucleotide mixtures by distinguishing between sequences with shared molecular weights and determining their concentrations, improving the quality control of oligonucleotide synthesis beyond the limitations of existing mass spectrometry methods.
Implementation Method 1
Electrospray ionization (ESI) mass spectroscopy ionizes target molecules such as oligonucleotides into multiple charge states
Implementation Method 2
MALDI-TOF uses laser light in conjunction with a chemical matrix to impart a charge to the sample in question and repel it from the sample plate
Implementation Method 3
The resulting ions travel through a flight tube to the detector, which measures particle counts as a function of time. The time-of-flight (TOF) is directly proportional to the mass of the molecule
Implementation Method 4
The dimethoxytrityl (DMT) group that is used for capping the 5′-hydroxyl group of the monomers in the oligonucleotide synthesis fluoresces in its protonated form after it is removed with an acid. The absorbance of the fluorescence can be measured at or around 498 nm
Data Source
AI summary
The invention provides a method for evaluating the accuracy of an oligonucleotide sample, specifically a sample containing a variety of oligonucleotides of potentially varying size and sequence. The method provides a fingerprint that can be used to evaluate the accuracy of a multi-oligonucleotide sample whether or not the sample contains differing oligonucleotides that have the same or about the same molecular weight.