Lentiviral Integration Junction Mapping With Rolling Circle Amplification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for assessing lentiviral vector delivery and integration in gene therapy lack a quick and accurate method for determining the location and copy number of provirus integration in the host genome.
Innovation Solution
A method involving shearing genomic DNA, inverse PCR using LTR region primers, and rolling circle amplification followed by bioinformatic analysis to determine the exact integration junction and copy number of lentiviral provirus in the human genome.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PCR and sequencing methods are used to analyze lentiviral integration, then the analysis can be performed with standard techniques, but the resolution and precision of integration location determination is insufficient
Solution Approach 1:
The method segments the genomic DNA into fragments containing LTR regions, then circularizes these fragments to create rolling circle amplification templates. This segmentation allows selective amplification and sequencing of integration junction regions, achieving high-resolution mapping without analyzing the entire genome, thus improving precision while controlling complexity.
Solution Approach 2:
The invention transitions from linear PCR amplification to circular rolling circle amplification, adding a dimensional change in the amplification approach. This circularization enables continuous strand displacement synthesis that generates multiple copies of the integration junction sequence, significantly improving sequencing depth and integration location precision.
2Manufacturing precision
If standard DNA sequencing methods are used, then the workflow is straightforward, but the copy number determination and integration junction analysis lack high resolution
Solution Approach 1:
The method performs preliminary circularization of DNA fragments containing LTR regions before amplification and sequencing. This preliminary action enriches the template for rolling circle amplification, ensuring that only relevant integration junction sequences are amplified with high efficiency, thereby achieving high-resolution analysis without compromising productivity.
Solution Approach 2:
The invention changes the amplification parameter from conventional PCR to rolling circle amplification, which generates long concatemeric sequences suitable for high-throughput sequencing. This parameter change enables simultaneous determination of integration location and copy number with high precision while maintaining analytical efficiency through automated bioinformatic processing.
3Ease of operation
If genomic DNA is sheared into small fragments, then the DNA is more manageable for PCR, but the junction region information may be lost
Solution Approach 1:
The method uses LTR-specific primers as intermediaries to capture and amplify junction regions. These primers bind to conserved LTR sequences and extend into the flanking genomic DNA, serving as a bridge that preserves junction information while enabling PCR amplification of sheared fragments. This intermediary approach ensures both ease of operation and preservation of critical junction sequence information.
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
Provides high-resolution analysis of lentiviral integration location and copy number, enabling precise quality assessment of viral transduction.
Implementation Method 1
rolling circle amplifying the PCR product
Data Source
AI summary
The invention is directed to method to obtain the genomic location of a provirus sequence embedded by two LTR regions in a DNA strand