Direct RT-PCR Detection of Nucleic Acids Without Extraction
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Solution Overview
Problem
Current methods for detecting nucleic acids, such as PCR and RT-qPCR, require nucleic acid extraction and pretreatment, which are complex, time-consuming, and result in sensitivity loss and safety hazards, especially during pandemics like COVID-19, where direct detection without extraction is needed for faster, safer, and more efficient diagnostics.
Innovation Solution
A system for direct RT-PCR that includes a buffer with specific components like Tris, salts, dNTPs, detergents, thermostable DNA polymerase, reverse transcriptase, and RNAse inhibitors, allowing for the direct detection of nucleic acids from biological samples without extraction or pretreatment, enhancing sensitivity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nucleic acid extraction and pretreatment are performed, then detection reliability is improved, but process complexity and time consumption increase
Solution Approach 1:
The patent combines the nucleic acid extraction step and the PCR detection step into a single integrated reaction system. The direct RT-PCR system allows biological samples to be added directly to the reaction mix without separate extraction and purification steps, thereby reducing process complexity while maintaining detection reliability through optimized reaction conditions and reagent formulations.
Solution Approach 2:
The direct RT-PCR system serves multiple functions simultaneously: it performs viral inactivation, nucleic acid release, and amplification detection in a single reaction vessel. This multi-functional approach eliminates the need for separate extraction protocols and makes the system adaptable to various sample types including saliva, swabs, and other biological specimens.
2Measurement precision
If nucleic acid extraction is performed, then detection sensitivity is improved, but time consumption and sensitivity loss occur
Solution Approach 1:
The reaction system is pre-formulated with optimized concentrations of enzymes, buffers, and reagents that can directly process crude biological samples. The thermostable polymerase and other components are prepared in advance to withstand the harsh conditions of direct sample addition, eliminating the need for time-consuming extraction steps while maintaining detection sensitivity.
Solution Approach 2:
The patent employs parameter optimization including adjusted pH levels, buffer compositions, and enzyme concentrations that enable the PCR reaction to proceed effectively directly from biological samples. These parameter changes allow the system to achieve detection sensitivity comparable to extraction-based methods while significantly reducing processing time.
3Object-affected harmful factors
If sample pretreatment is performed, then safety is improved, but process complexity increases
Solution Approach 1:
The patent integrates sample inactivation and nucleic acid amplification into a single reaction step. The thermostable polymerase and reaction conditions inherently inactivate viral particles while simultaneously enabling DNA synthesis, thereby achieving safety without requiring separate pretreatment steps that would increase process complexity.
Solution Approach 2:
The direct RT-PCR system performs self-inactivation of viral samples through the reaction conditions themselves. The thermal cycling process and chemical environment of the PCR reaction naturally denature and inactivate viral particles, eliminating the need for separate safety-focused pretreatment steps.
4Measurement precision
If conventional RT-PCR is used, then detection accuracy is maintained, but throughput and efficiency decrease
Solution Approach 1:
The patent segments the traditional multi-step diagnostic workflow into a single integrated direct RT-PCR reaction. By eliminating the extraction intermediate step, the system reduces the total number of operations required, thereby increasing throughput and efficiency while maintaining detection accuracy through optimized reaction conditions.
Solution Approach 2:
The direct RT-PCR system enables continuous processing of samples without interruption for extraction and purification. Samples can be added directly to reaction plates and processed in high-throughput formats, allowing the useful action of detection to continue uninterrupted and significantly increasing overall productivity.
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
The system enables sensitive and efficient detection of nucleic acids, such as SARS-CoV-2 RNA, with lower cycle threshold values and higher throughput, making it suitable for high-throughput automation and safer sample handling, particularly in pandemic situations.
Implementation Method 1
Many diseases are diagnosed by polymerase chain reaction (PCR), such as reverse transcription quantitative PCR (RT-qPCR)
Implementation Method 2
reverse transcription quantitative PCR (RT-qPCR)
Implementation Method 3
a buffer with specific components like Tris, salts, dNTPs
Implementation Method 4
detergents, thermostable DNA polymerase
Data Source
AI summary
The present disclosure generally relates to systems, compositions, kits, and methods for detection of nucleic acids in biological samples. The present disclosure also relates to ultrasensitive direct detection of pathogenic nucleic acids in various biological samples without the need to isolate the nucleic acids from the samples. The present disclosure further relates to detection of airborne or blood borne viruses directly from biological samples.