Filter Paper Direct PCR Amplification Without Nucleic Acid Isolation
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Solution Overview
Problem
Current PCR technologies require lengthy and invasive sample preparation processes, including nucleic acid extraction and purification, which are time-consuming, require technical expertise, and often result in sample loss, limiting their applicability and efficiency.
Innovation Solution
The method involves directly applying samples to filter paper, which serves as both a collection and reaction medium for PCR amplification, eliminating the need for nucleic acid isolation and using a handheld device for thermocycling, allowing for rapid and accurate amplification of nucleic acids from small sample volumes without the need for specialized equipment or skills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nucleic acid extraction and purification procedures are performed, then amplification accuracy is improved, but process time and operational complexity increase
Solution Approach 1:
The patent merges sample collection, nucleic acid extraction, purification, and PCR amplification into a single integrated process on filter paper. The filter paper serves multiple functions: collecting the biological sample, extracting nucleic acids through capillary action, purifying them by retaining inhibitors, and providing the reaction surface for PCR amplification. This consolidation eliminates the need for separate extraction and purification steps, reducing process time while maintaining amplification accuracy.
Solution Approach 2:
The filter paper acts as a universal platform performing multiple functions simultaneously: it serves as a collection medium for biological samples, an extraction matrix for nucleic acids, a purification filter by removing inhibitors through its porous structure, and a reaction substrate for PCR amplification. This multi-functionality eliminates the need for multiple specialized reagents and steps, streamlining the entire workflow.
2Measurement precision
If nucleic acid extraction and purification procedures are performed, then amplification accuracy is improved, but device complexity and skill requirements increase
Solution Approach 1:
The patent combines multiple complex steps (extraction, purification, amplification) into a single simple operation on filter paper. The filter paper's porous structure inherently performs purification by retaining inhibitors while allowing nucleic acids to pass through, eliminating the need for complex purification protocols and specialized equipment. Any individual can perform the amplification by simply applying the sample to the paper and placing it in a basic thermocycler.
Solution Approach 2:
The filter paper performs self-service purification through its porous structure, which automatically retains inhibitors and allows nucleic acids to pass through during the application process. The paper's capillary action spontaneously draws the sample through the matrix, performing extraction and purification without requiring external equipment or complex manual procedures. This self-service mechanism dramatically reduces device complexity and skill requirements.
3Manufacturing precision
If traditional nucleic acid isolation procedures are used, then sample purity is improved, but sample loss occurs
Solution Approach 1:
The patent merges extraction and purification into a single step on the filter paper, where nucleic acids are retained on the paper matrix while inhibitors are removed. The same filter paper that performs purification also serves as the reaction substrate for PCR amplification, ensuring that all recovered nucleic acids are utilized without loss during transfer between tubes or containers. This eliminates sample loss associated with multiple handling steps while maintaining purity through the paper's selective retention properties.
4Productivity
If filter paper is used for direct PCR amplification, then process time is reduced, but amplification sensitivity must be maintained
Solution Approach 1:
The filter paper's porous structure is key to maintaining amplification sensitivity while enabling rapid processing. The pores retain nucleic acids on the paper matrix during the streamlined extraction and purification process, ensuring high recovery efficiency. The porous structure also allows for efficient heat transfer during thermocycling, enabling rapid amplification. The paper's ability to concentrate nucleic acids in its porous matrix ensures sufficient template availability for sensitive detection even with small sample volumes.
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 quick, accurate, and sensitive amplification of nucleic acids from small sample volumes, reducing thermocycling time and eliminating the risk of sample loss, making it suitable for point-of-care diagnostics and reducing the need for invasive procedures.
Implementation Method 1
The filter paper serves as both a collection and reaction medium for PCR amplification, eliminating the need for nucleic acid isolation
Implementation Method 2
using a handheld device for thermocycling, allowing for rapid and accurate amplification of nucleic acids
Data Source
AI summary
Disclosed is a method to amplified nucleic acids by polymerase chain reaction (PCR) without isolation or purification from the biological samples. All the reactions associated with reverse transcriptase qPCR or real-time qPCR are completed on a filter paper chamber using a handheld Real-time PCR device. The process requires a very small amount of sample since there is no loss of materials associated with isolation and purification steps. The amplification process is faster than a normal tube-based PCR reaction because the thin chamber makes heating and cooling process fast. This technique is applicable in the rapid detection of pathogenic viruses from body fluids, such as COVID-19 detection in saliva. The technology is valuable for quantitative detection of nucleic acids that are established markers of diseases. Novel use of a piece of filter paper to perform sample collection, storage, and conduct direct PCR amplification without any extraction of the sample will allow us to test infections and the diseases anywhere by anybody without the requirement of technical knowledge or skills.