Nucleic Acid Quantification via Amplification Efficiency Function
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Solution Overview
Problem
Conventional methods for determining the initial concentration of nucleic acids in samples using real-time amplification data face inefficiencies and inaccuracies, particularly in quantifying DNA concentrations through PCR, as they rely on derivative values or cycle numbers without considering amplification efficiency patterns effectively.
Innovation Solution
A method that involves amplifying nucleic acids, measuring signals, and formulating an amplification efficiency function using geometric mean values over time to determine the initial concentration, where the amplification efficiency is maximized, allowing for precise quantification using a reference curve with known initial concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional derivative-based methods are used to determine initial nucleic acid concentration, then quantification can be performed, but measurement precision and reliability are reduced due to variability in derivative calculations
Solution Approach 1:
The patent changes the parameter used for quantification from derivative-based values (which have high variability) to amplification efficiency values calculated from geometric means of signal ratios. This parameter transformation stabilizes the quantification process and improves both precision and reliability by avoiding the mathematical operations that amplify noise.
Solution Approach 2:
The patent creates a reference curve by copying the amplification efficiency pattern from control samples with known concentrations to the unknown sample. This allows determination of initial concentration by matching the amplification efficiency pattern rather than relying on noisy derivative calculations, thereby improving reliability.
2Measurement precision
If real-time PCR with fluorescent dyes is used, then DNA quantification becomes possible, but the complexity of the detection system increases
Solution Approach 1:
The patent uses the fluorescent signal itself to provide all necessary information for quantification. The amplification efficiency is derived directly from the signal ratios between cycles, eliminating the need for separate derivative calculations or additional measurement steps. The system serves itself by using the primary measurement data for multiple purposes.
3Productivity
If maximum derivative value methods are used to determine Ct, then quantification can be performed, but measurement precision deteriorates due to sensitivity to noise in the derivative calculation
Solution Approach 1:
The patent performs preliminary calculation of amplification efficiency values using geometric means before determining the Ct point. This preliminary processing smooths out noise and variability, so that when the maximum amplification efficiency point is identified, it is more reliable and less sensitive to random fluctuations in the data.
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 enhances the accuracy and reliability of nucleic acid concentration determination by using geometric mean values of amplification efficiency, reducing variability and improving quantification precision compared to traditional methods.
Implementation Method 1
amplifying a target nucleic acid and measuring signals from the amplified product
Implementation Method 2
a real-time PCR which makes DNA quantification possible using an optical signal agent such as a fluorescent dye and an optical detection system by detecting the optical (e.g., fluorescent) signal intensity directly proportional to the amplified DNA concentration
Data Source
AI summary
Disclosed is a method of determining an initial concentration of a target nucleic acid within a sample using real-time nucleic acid amplification data. Amplification efficiencies of the target nucleic acid with respect to amplification time are obtained from signals of amplified products, and an amplification efficiency function with respect to amplification time is formulated employing the amplification efficiencies.