Multi-Locus PTEN Copy Number Detection by Digital PCR
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Solution Overview
Problem
Existing methods for determining PTEN copy number often fail to accurately reflect deletions at loci other than the investigated one, leading to inaccuracies in assessing PTEN expression and enzymatic activity in cancer.
Innovation Solution
Simultaneously amplifying three or more PTEN loci and two or more reference genes using digital PCR, calculating a ratio of PTEN amplification to reference gene amplification to determine PTEN copy number, and optionally comparing individual PTEN locus concentrations to individual reference gene concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-locus PTEN amplification methods are used, then the assay complexity is low, but the measurement precision of PTEN copy number is insufficient because deletions at other loci are not detected
Solution Approach 1:
The patent combines multiple PTEN locus amplifications into a single digital PCR assay. By designing probe sets that simultaneously detect multiple PTEN loci (e.g., exon 2, exon 3, exon 4) along with reference genes in one reaction mixture, the method achieves comprehensive PTEN copy number assessment without requiring separate assays for each locus, thus improving measurement precision while controlling assay complexity
Solution Approach 2:
The patent creates a universal digital PCR assay that can detect PTEN copy number changes across multiple loci simultaneously. The assay design allows a single reaction system to perform multiple detection functions (monitoring different PTEN loci and reference genes), making the method broadly applicable for detecting various PTEN deletion patterns in different cancer types without requiring locus-specific optimization
2Measurement precision
If multiple PTEN loci are simultaneously amplified, then the measurement precision improves by detecting deletions at multiple loci, but the device complexity increases due to multiple probes and loci
Solution Approach 1:
The patent segments the PTEN gene into multiple distinct loci (exon 2, exon 3, exon 4, etc.) and designs specific probe sets for each segment. By dividing the detection task into discrete loci with dedicated probes, the assay can precisely identify which specific PTEN locus is deleted while maintaining a structured and manageable probe design framework that controls complexity
Solution Approach 2:
The patent introduces reference genes as intermediary controls in the digital PCR assay. These reference genes serve as mediators to normalize the detection signals from multiple PTEN loci, allowing accurate interpretation of copy number changes while providing a built-in control mechanism that simplifies data analysis and reduces the complexity of determining true PTEN deletions versus technical artifacts
3Productivity
If digital PCR with multiple loci is used, then the productivity of comprehensive PTEN assessment is improved, but the use of energy and reagents increases
Solution Approach 1:
The patent merges multiple PTEN locus amplifications and reference gene amplifications into a single digital PCR reaction well. By combining what would traditionally require multiple separate assays into one reaction, the method achieves comprehensive PTEN assessment across multiple loci while consuming reagents and energy only once, thus improving productivity without proportionally increasing resource consumption
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
Enhances the accuracy of PTEN copy number determination by identifying deletions that may be missed in single-locus methods, providing precise quantification and distinguishing locus-specific changes, applicable to various sample types including fresh frozen and FFPE tissues.
Implementation Method 1
simultaneously amplifying three or more PTEN loci and two or more reference genes by digital PCR
Data Source
AI summary
Methods of determining PTEN copy number are described. The methods can include simultaneously amplifying three or more PTEN loci and two or more reference genes by digital PCR.