Vector Backbone Quantification via Junction Amplification
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Solution Overview
Problem
Current methods for removing vector backbone from nucleic acid preparations are inefficient, inaccurate, and time-consuming, particularly due to contamination issues with E. coli DNA in detection assays, leading to wastage of DNA and low throughput.
Innovation Solution
A method involving amplification reactions to detect the absence or presence of vector backbone by targeting specific junctions between the polynucleotide of interest and the vector backbone using nuclease recognition sites, allowing for the quantification of vector backbone in nucleic acid preparations through quantitative amplification assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If restriction enzyme digestion and preparative gel electrophoresis are used to remove vector backbone, then vector backbone sequences can be removed from nucleic acid preparations, but the process becomes time-consuming, inefficient, and inaccurate
Solution Approach 1:
The patent replaces mechanical/manual methods (restriction enzyme digestion, gel electrophoresis, manual quantification) with an automated real-time PCR-based quantification system. The method uses fluorescent probes and thermal cycling to automatically detect and quantify vector backbone sequences, eliminating the need for time-consuming manual gel analysis and providing accurate, rapid results.
Solution Approach 2:
The patent uses PCR amplification to create copies of specific DNA regions (vector backbone junctions containing restriction sites) for detection. By amplifying these target sequences in real-time with fluorescent reporters, the system can quantify vector backbone presence without requiring physical manipulation or visual analysis of gel electrophoresis results.
2Measurement precision
If serial dilution and back-transformation into E. coli are performed to estimate E. coli DNA, then vector backbone contamination can be detected, but the process is complicated and inaccurate
Solution Approach 1:
The patent replaces the complex biological assay system (serial dilution, transformation, colony counting) with a molecular biology-based PCR detection system. The method directly quantifies vector backbone sequences in the nucleic acid preparation using real-time PCR with fluorescent probes, providing accurate measurements without the need for E. coli transformation or manual counting procedures.
Solution Approach 2:
The patent introduces fluorescently labeled probes as intermediaries that specifically bind to vector backbone sequences during PCR amplification. These probes emit fluorescent signals that are detected in real-time, serving as a mediator between the target DNA sequences and the detection system, enabling accurate quantification without complex sample preparation or biological transformation steps.
3Productivity
If Taq DNA polymerase and TAQ expression plasmid DNA are used in detection assays, then amplification reactions can proceed, but E. coli DNA contamination interferes with measurement of ColE region
Solution Approach 1:
The patent applies local quality by designing probes that are specific to particular regions of the vector backbone (such as the junction between vector and insert sequences containing restriction sites). Rather than attempting to detect all E. coli DNA, the method focuses on detecting specific vector backbone sequences that are unique to the transformation construct, thereby avoiding interference from E. coli genomic DNA or plasmid contaminants.
Solution Approach 2:
The patent extracts or isolates the detection of specific vector backbone sequences from the complex mixture of DNA present in the reaction. By using primers and probes that specifically target unique junction regions between the vector and inserted sequences, the method selectively detects only the relevant vector backbone portions while ignoring E. coli DNA contamination.
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 rapid and accurate quantification of vector backbone, improving the efficiency and accuracy of nucleic acid preparation purification for transformation processes, reducing wastage and increasing throughput.
Implementation Method 1
performing an amplification reaction to amplify a junction located between the POI and a vector backbone
Implementation Method 2
the junction comprises a recognition site for a nuclease
Data Source
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AI summary
The invention provides methods and compositions for detecting and/or quantifying vector backbone in a nucleic acid preparation comprising a polynucleotide of interest using amplification assays that amplify a junction located between the polynucleotide of interest and the vector backbone, under conditions whereby amplification can occur, wherein the junction comprises a recognition site for a nuclease, and detecting the absence of an amplification product, whereby the absence of the amplification product indicates low or no vector backbone and/or quantifying the amount of amplification product to determine the amount of vector backbone in the nucleic acid preparation.