Multiplex PCR Assay for DNA Quantitation and Gender Determination
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Solution Overview
Problem
Current methods for DNA quantitation in forensic analysis are inefficient as they require additional equipment and training, and fail to provide a convenient means to analyze DNA quantity, quality, gender of the donor, and presence of PCR inhibitors in a single reaction, especially using only routine PCR technology.
Innovation Solution
The Q-TAT method employs a multiplex PCR reaction with oligonucleotide primers targeting the human amelogenin locus, SRY gene, and a non-human reporter gene to quantify DNA, determine gender, and detect PCR inhibitors, using existing PCR technology and instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate methods are used for DNA quantitation, gender determination, and inhibitor detection, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The patent combines multiple separate analytical functions (DNA quantitation, gender determination, and PCR inhibitor detection) into a single multiplex PCR reaction. This is achieved by incorporating multiple primer sets targeting different genomic regions (amelogenin for gender, Alu sequences for quantitation, and control sequences for inhibitor detection) that all amplify simultaneously in one reaction mixture, eliminating the need for separate equipment and procedures.
Solution Approach 2:
The multiplex PCR system serves multiple functions simultaneously: it quantitates human DNA through Alu sequence amplification, determines gender through amelogenin locus amplification, detects PCR inhibitors through control sequence amplification, and assesses DNA quality through amplification efficiency. This multi-functional approach replaces multiple specialized methods with a single universal platform.
2Measurement precision
If multiple separate reactions are performed for comprehensive DNA analysis, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The multiplex PCR reaction maintains continuous useful action by performing multiple analytical functions in a single uninterrupted reaction process. All primer sets amplify simultaneously throughout the PCR cycles, generating multiple lines of evidence (quantitation, gender, inhibitor presence, quality assessment) from one continuous experimental run rather than sequential separate reactions.
Solution Approach 2:
Multiple analytical reactions are merged into one multiplex PCR protocol, reducing the total number of setup, incubation, and analysis steps. The combined reaction produces all necessary information in parallel, dramatically reducing the overall time required for comprehensive DNA analysis while maintaining the precision of individual measurements.
3Measurement precision
If specialized equipment and methods are used for DNA quantitation, then measurement precision is improved, but ease of operation worsens
Solution Approach 1:
The multiplex PCR system uses universal PCR technology and standard laboratory equipment that forensic laboratories already possess for routine DNA typing. By leveraging the existing PCR infrastructure and adding multiple primer sets to the reaction mix, the system achieves specialized quantitation and characterization functions without requiring new specialized equipment or extensive additional training.
Solution Approach 2:
The system performs self-service by using the same PCR amplification and detection infrastructure already present in forensic laboratories for routine DNA typing. The multiplex reaction automatically provides quantitation, gender, and quality information as part of the standard PCR workflow, eliminating the need for separate specialized procedures and equipment.
4Productivity
If a single multiplex reaction is used for comprehensive DNA analysis, then productivity is improved, but measurement precision may worsen
Solution Approach 1:
The multiplex PCR system applies local quality by using different primer sets with optimized characteristics for specific functions: Alu sequence primers for quantitation, amelogenin primers for gender determination, and control sequence primers for inhibitor detection. Each primer set is locally optimized for its specific target, ensuring that the single reaction maintains the measurement precision required for each individual analytical function while improving 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
Enables rapid, sensitive, and reproducible analysis of DNA quantity, quality, and gender, while detecting PCR inhibitors, reducing costs and equipment needs, and improving efficiency in forensic DNA typing.
Implementation Method 1
carrying out a single, polymerase chain reaction (PCR) multiplex reaction utilizing primer sets specific for amplifying the human amelogenin locus
Implementation Method 2
detecting PCR amplicons produced in said step of PCR amplifying, wherein results obtained in said detecting step are indicative of the genomic DNA quantity
Data Source
AI summary
Methods are provided for determining, in a single polymerase chain reaction (PCR) reaction, the quantity, quality, and gender of origin of DNA in a sample, and whether or not the sample contains PCR amplification inhibitors. The methods involve carrying out a single PCR multiplex reaction utilizing primer sets specific for amplifying the human amelogenin locus, an X- and/or Y-chromosome specific gene that is shorter than the amelogenin gene, and a heterologous, non-human reporter gene.