FFPE Nucleic Acid Quality Assessment via Amplicon Size Ladder
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Solution Overview
Problem
Current methods for evaluating nucleic acids from formalin-fixed, paraffin-embedded (FFPE) tissues are cumbersome, time-consuming, and prone to degradation, leading to variable quality and quantity of extracted nucleic acids, which compromises genetic analysis due to fragmentation and cross-linking issues.
Innovation Solution
A kit containing control and target amplification reagents with pairs of amplification oligonucleotides capable of amplifying specific nucleic acid molecules, such as MCAD, to assess nucleic acid quality and quantity by producing detectably distinguishable amplicons, allowing for simultaneous evaluation of nucleic acid integrity during genetic analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional organic extraction methods using xylene and graded alcohols are used to remove paraffin from FFPE tissue sections, then paraffin removal is achieved, but the process becomes time-consuming, laborious, and requires special handling due to toxic chemicals
Solution Approach 1:
The patent extracts and removes the harmful paraffin component from FFPE tissue sections using a specialized solvent system that selectively dissolves paraffin while preserving nucleic acids, thereby eliminating the need for time-consuming organic extraction steps with xylene and alcohols
Solution Approach 2:
The patent introduces a intermediary solvent system that acts as a mediator between the paraffin-embedded tissue and the subsequent nucleic acid extraction process, facilitating paraffin removal without requiring harsh organic solvents and reducing overall processing time
2Quantity of substance
If repeated handling, aspirations and tube transfers are performed during nucleic acid extraction from FFPE tissues, then nucleic acid recovery is attempted, but non-quantitative harvests and additional sample degradation occur
Solution Approach 1:
The patent combines multiple extraction and purification steps into a single integrated protocol that minimizes the number of transfer operations, thereby reducing mechanical stress and degradation while maintaining quantitative nucleic acid recovery
Solution Approach 2:
The patent performs preliminary optimization of the extraction protocol to establish conditions that maximize nucleic acid stability and recovery in a single operation, eliminating the need for repeated handling and transfers that cause degradation
3Measurement precision
If standard analytical techniques are used to evaluate extracted nucleic acids from FFPE tissues, then nucleic acid quantity and quality assessment is attempted, but qualitative and quantitative assay errors result due to fragmentation and degradation
Solution Approach 1:
The patent changes the assessment parameters by using alternative metrics and methods that are insensitive to nucleic acid fragmentation, such as evaluating amplification efficiency and signal intensity ratios rather than relying on standard spectrophotometric or fluorometric quantitation that overestimates degraded samples
4Productivity
If commercial kits are used to optimize nucleic acid extraction from FFPE tissues, then extraction efficiency is improved, but variable quality and quantity of nucleic acid recovered still occur
Solution Approach 1:
The patent introduces dynamic adjustment capabilities in the extraction protocol, allowing optimization of critical parameters such as solvent composition, incubation time, and temperature based on specific sample characteristics, thereby achieving consistent high-quality results across variable FFPE tissue samples
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 assessment of nucleic acid quality and quantity, improving the reliability of genetic analysis by providing a size control ladder for evaluating sample integrity and reducing errors in mRNA copy number determinations.
Implementation Method 1
pairs of amplification oligonucleotides capable of amplifying a medium chain acyl-coenzyme A dehydrogenase (MCAD) nucleic acid molecule
Implementation Method 2
capable of amplifying a medium chain acyl-coenzyme A dehydrogenase (MCAD) nucleic acid molecule or a complement thereof
Data Source
AI summary
Methods, kits, and compositions for evaluating the quality of nucleic acids within a biological sample for analysis in a molecular assay are provided.