Dendron-Mediated DNA Virus Detection on Integrated Microfluidic Chips
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Solution Overview
Problem
Current DNA chip technologies require multiple complex and time-consuming processes for nucleic acid detection, including extraction, amplification, and hybridization, which are labor-intensive, costly, and prone to sample loss, limiting their use in clinical settings for rapid diagnosis of diseases like cervical cancer caused by HPV.
Innovation Solution
A method for one-step nucleic acid detection using a DNA chip that integrates all necessary processes in a single chamber, allowing for direct amplification and hybridization on the chip surface without solution changes, facilitated by immobilized nucleic acid probes and a programmable thermocycler, enabling rapid and automated diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-step DNA chip processes are used for nucleic acid detection, then detection accuracy can be maintained, but the process becomes complex and time-consuming with multiple manual operations
Solution Approach 1:
The patent combines multiple separate operations (extraction, amplification, labeling, and hybridization) into a single integrated microfluidic chip system. The chip contains multiple chambers that perform these functions sequentially without requiring manual transfer of samples between different containers or equipment, thereby maintaining detection accuracy while significantly reducing process complexity and manual handling steps.
Solution Approach 2:
The microfluidic chip is designed as a universal platform that performs multiple functions within a single device. It includes chambers for cell lysis, DNA extraction, PCR amplification, fluorescent labeling, and hybridization with capture probes. This multi-functional integration allows the same chip to handle the entire diagnostic workflow from sample to result, reducing the need for multiple separate instruments and manual operations.
2Ease of operation
If multiple manual manipulation steps are performed for DNA extraction and processing, then sample handling can be completed, but sample loss increases and reliability decreases
Solution Approach 1:
The patent integrates multiple sample handling operations within a closed microfluidic system. Samples remain contained within the chip throughout the entire process, moving from one chamber to the next through controlled fluidic pathways. This eliminates the need for manual transfer between tubes and containers, reducing sample loss and contamination while maintaining ease of operation through automated fluid handling.
Solution Approach 2:
The microfluidic chip acts as an intermediary system that automates the transfer and processing of biological samples. Integrated pumps and valves control fluid flow through different chambers, replacing manual pipetting and transfer operations. This intermediary automation ensures consistent sample handling, minimizes human error, and reduces sample loss while maintaining operational simplicity.
3Measurement precision
If traditional PCR and hybridization processes are performed separately, then each step can be optimized, but the overall diagnosis time increases
Solution Approach 1:
The patent implements continuous automated processing where the output of one chamber immediately becomes the input for the next chamber. After DNA extraction in one chamber, the same fluid stream continues to the PCR amplification chamber, then to the labeling chamber, and finally to the hybridization chamber without interruption or manual intervention. This continuous flow methodology eliminates idle time between steps while maintaining optimal conditions for each process, thereby reducing total diagnosis time without sacrificing detection sensitivity.
Solution Approach 2:
The chip performs preliminary actions in advance by pre-configuring all necessary reagents, capture probes, and reaction conditions within each chamber before sample introduction. DNA extraction reagents are pre-loaded in the lysis chamber, PCR reagents are prepared in the amplification chamber, and capture probes are immobilized in the hybridization chamber beforehand. This preliminary preparation eliminates setup time during actual sample processing and enables immediate sequential processing, reducing overall diagnosis time while maintaining detection precision.
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 simplifies the detection process, reducing labor and time, minimizing sample loss, and enhancing the reliability and efficiency of nucleic acid diagnosis, making it suitable for clinical use in detecting various DNA viruses and HPV types.
Implementation Method 1
hybridization of the amplified DNA with the oligonucleotides (often called capture probes) immobilized on the surface of a solid substrate
Implementation Method 2
PCR requires a programmable thermocycler. Generally, the PCR process involves denaturation of DNA (strand separation) at a high temperature (95° C.), annealing of short primers (usually 15-20 nucleotides) that are complementary to either ends of a DNA region to be amplified, and chain elongation from the annealed primers in the presence of thermostable DNA polymerase
Data Source
AI summary
The disclosure relates to chips containing nucleic acid probes or primers and their use in methods to detect nucleic acid molecules of DNA viruses. The disclosure includes DNA chips with probes immobilized via a dendron-mediated linkage in contact with a thermocycler capable of automatically regulating the temperature, temperature cycle times, and number of temperature cycles of the chips to provide genetic diagnosis in one step.