Nucleic Acid Modifying Reagents for Photoactivation-Free Viability PCR
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Solution Overview
Problem
Existing nucleic acid-based methods, such as PCR and isothermal amplification, struggle to assess cell viability due to variability in light spectrum and intensity, limiting their broad utilization and accuracy, especially in complex samples.
Innovation Solution
Compounds comprising a nucleic acid binding moiety, a live/dead cell differentiating moiety, and a nucleic acid modifying moiety are used to selectively amplify nucleic acids from viable cells without a photoactivation step, allowing for consistent detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PMA is used to differentiate viable from non-viable cells via photoactivation, then DNA from dead cells can be selectively modified, but sample-to-sample variability increases due to variations in light spectrum and intensity
Solution Approach 1:
The patent replaces the optical/photochemical system (PMA photoactivation requiring specific light spectrum and intensity) with a chemical system (spontaneous chemical reaction at controlled pH). The nucleic acid modifying reagent undergoes spontaneous chemical modification of DNA from non-viable cells without requiring photoactivation, eliminating variability associated with light source characteristics while maintaining selective modification capability.
2Productivity
If standard DNA-targeted methods like PCR are used, then nucleic acid detection is achieved, but cell viability assessment becomes difficult
Solution Approach 1:
The patent merges two previously separate processes into one unified workflow: (1) spontaneous chemical modification of DNA from non-viable cells by the nucleic acid modifying reagent, and (2) standard nucleic acid amplification detection. This combination allows simultaneous achievement of viability differentiation and efficient nucleic acid detection using conventional PCR or isothermal amplification methods, eliminating the need for separate viability assessment steps.
3Productivity
If PMA photoactivation is used to modify DNA from dead cells, then amplification of viable cell DNA is enabled, but the process becomes complex and time-consuming
Solution Approach 1:
The patent extracts and eliminates the photoactivation step from the workflow. The nucleic acid modifying reagent is designed to spontaneously react with and modify DNA from non-viable cells through chemical reaction alone, removing the need for photoactivation equipment, light source optimization, and associated timing constraints. This simplifies the overall process while maintaining the ability to selectively amplify DNA from viable cells.
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
The method simplifies the nucleic acid amplification process, improves viability testing consistency, and reduces interference from non-viable cells, enabling culture-independent detection of viable cells.
Implementation Method 1
compounds that can spontaneously modify nucleic acids from non-viable cells
Data Source
AI summary
The present disclosure includes compounds, compositions, and methods for nucleic acid amplification reactions. In particular, the present disclosure provides compounds, compositions, and methods for viability PCR (vPCR) applications, in which the compounds that selectively bind to nucleic acids from non-viable cells.