Autoligation Chain Reaction Nucleic Acid Amplification
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Solution Overview
Problem
Current PCR-based methods for nucleic acid amplification face challenges such as PCR inhibitors in samples, leading to low sensitivity and false-negative results, and are labor-intensive and costly, making them unsuitable for routine genetic testing in price-sensitive laboratories.
Innovation Solution
A method for amplifying nucleic acid sequences without enzymes or nucleosides, using a combination of forward and reverse primer nucleic acids with bond-forming reactive moieties that undergo autoligation, allowing for linear or exponential amplification of target sequences at temperatures that denature nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PCR-based methods are used for nucleic acid amplification, then amplification sensitivity is improved, but PCR inhibitors in samples cause false-negative results and reduce reliability
Solution Approach 1:
The invention extracts and removes PCR inhibitors from samples through purification steps before amplification. The method specifically isolates target nucleic acids while eliminating contaminants that would interfere with polymerase activity, thereby resolving the contradiction between maintaining sensitivity and avoiding false-negative results caused by inhibitors.
Solution Approach 2:
The invention performs preliminary purification and pre-amplification steps before the main PCR amplification. By preparing samples in advance and removing inhibitors prior to the amplification reaction, the method ensures both high sensitivity and reliability of the final test results.
2Productivity
If PCR-based assays are implemented in routine settings, then diagnostic capability is improved, but labor-intensive sample preparation and assay development increase costs and time
Solution Approach 1:
The invention segments the amplification process into distinct modules: purification, pre-amplification, and main PCR amplification. This modular approach allows each step to be optimized independently and enables flexible adaptation to different sample types without requiring complete re-development of the entire assay, thereby reducing development costs and time.
Solution Approach 2:
The invention develops universal primers and protocols that can amplify target sequences across multiple sample types (blood, saliva, tissue, etc.). This multi-functional approach eliminates the need for extensive optimization for each sample type, significantly reducing assay development time and costs while maintaining high diagnostic capability.
3Reliability
If sample purification is performed to remove PCR inhibitors, then test reliability is improved, but additional time and cost are required
Solution Approach 1:
The invention combines purification and pre-amplification steps into a streamlined workflow where inhibitor removal and target enrichment occur in an integrated manner. This merging of steps reduces the total time required compared to performing separate purification and amplification preparations, while still ensuring high test accuracy.
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 cost-effective and easier-to-use alternatives for genetic testing, capable of amplifying nucleic acid sequences across multiple sample types without the need for sample preparation development, thereby improving sensitivity and reducing costs.
Implementation Method 1
using a combination of forward and reverse primer nucleic acids with bond-forming reactive moieties that undergo autoligation
Data Source
AI summary
The invention relates to the amplification of specific target nucleic acids. The invention provides methods, reagents, and kits for carrying out such amplification via the autoligation chain reaction (ACR).