Nucleic Acid Release Composition for Direct PCR Amplification
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Solution Overview
Problem
Current methods for nucleic acid release and amplification from biological samples are time-consuming, prone to contamination, and generate significant biohazardous waste, as they require separate steps for isolation and amplification, which are often inhibited by reagents used for nucleic acid release.
Innovation Solution
A composition comprising a surfactant, enzyme inhibitor, and stabilizer is used to release nucleic acids from biological samples in less than 10 minutes without inhibiting polymerase chain reactions, allowing for direct amplification without intervening separation steps, using a collection device that includes a reservoir with the composition for thermal cycling and nucleic acid polymerase addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate isolation steps (precipitation, filter capture, particle capture) are used to release nucleic acids from cells and viruses, then nucleic acids can be separated from reagents, but the process is time-consuming (15 minutes or more), involves multiple handling steps that increase contamination risk, and generates significant biohazardous waste
Solution Approach 1:
The patent combines the nucleic acid release function and amplification function into a single tube by using a buffer composition that is compatible with both cell lysis and PCR amplification. This eliminates the need for separate isolation steps, reducing processing time from 15 minutes or more to a streamlined single-step process while maintaining reliable nucleic acid release and preventing contamination through reduced handling steps
2Productivity
If reagents used for nucleic acid release are used, then nucleic acids can be effectively released from cells and viruses, but these reagents strongly inhibit enzymes utilized in subsequent amplification steps
Solution Approach 1:
The patent modifies the chemical parameters of the buffer composition by selecting specific components (non-ionic surfactants at 0.1-5% v/v, ionic surfactants at 0.01-1% v/v, protein stabilizers at 0.1-10% w/v, and EDTA at 0.5-10 mM) that create a chemical environment compatible with both cell lysis and PCR amplification. This parameter optimization allows effective nucleic acid release while preventing enzyme inhibition, enabling direct amplification without isolation steps
3Reliability
If isolation methods are implemented to separate nucleic acids from release reagents, then amplification can proceed without inhibition, but the transfer step dramatically increases the chance of contamination from different samples and environment
Solution Approach 1:
The patent merges the release and amplification processes into a single closed-tube system, eliminating the physical transfer of nucleic acids between tubes. The buffer composition is designed to be compatible with both lysis and amplification, allowing the entire process to occur in one container. This eliminates contamination risks associated with transfer steps while maintaining amplification purity through the use of contamination-free reagents and closed-system processing
4Productivity
If current nucleic acid release methods are used, then nucleic acids can be released from samples, but the process generates significant biohazardous waste including supernatants, filters, particles, and consumables
Solution Approach 1:
The patent extracts and eliminates the need for separate isolation steps, filters, and precipitation procedures by using a direct amplification-compatible buffer. This removes the sources of biohazardous waste (supernatants, used filters, used particles, pipette tips, centrifuge tubes) while maintaining effective nucleic acid release capability through the optimized buffer composition that enables direct amplification from the lysis mixture
Data Source
AI summary
Compositions, methods, kits, and systems are provided in which a biological sample containing cells and/or viruses that include a nucleic acid of interest are treated with an amplification-compatible releasing composition that provides release of the nucleic acid from cells and/or viruses in the sample and also permits amplification of the released nucleic acids without an intervening separation step. Methods incorporating such compositions are also described, and provide simple and rapid release of nucleic acids from cells and viruses along with subsequent amplification steps. Collection devices incorporating such compositions and kits for collection, release, and amplification of nucleic acids utilizing such compositions are provided, as are systems for characterizing nucleic acids.