One-Step RT-PCR Buffer for Direct Cell Lysis and RNA Amplification
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Solution Overview
Problem
Current PCR and RT-PCR methods are inefficient for analyzing RNA from small numbers of cells, as they require time-consuming intermediate purification steps and can lead to material loss, making high-throughput, automated analysis challenging.
Innovation Solution
A one-step RT-PCR method that involves transferring a liquid sample with eukaryotic cells into a vessel with a thermostable DNA polymerase-containing buffer, incubating at 37°C to 65°C, and then heating to 90°C for lysis and amplification without intermediate purification, allowing direct amplification and analysis of RNA from as few as one cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RNA isolation and purification steps are performed, then PCR amplification quality is improved, but analysis time increases and material loss occurs
Solution Approach 1:
The patent combines cell lysis and RNA extraction steps into a single integrated reaction buffer system. The lysis buffer contains detergents and enzymes that simultaneously break down cell membranes and release RNA, eliminating the need for separate purification steps while maintaining amplification quality.
Solution Approach 2:
The reaction buffer serves multiple functions: it acts as a lysis buffer to break down cells, an extraction buffer to release RNA, and a PCR master mix to support amplification. This multi-functional buffer system resolves the contradiction by performing multiple tasks in one step, reducing time without compromising reliability.
2Reliability
If traditional RNA isolation and purification steps are performed, then PCR amplification quality is improved, but material loss increases
Solution Approach 1:
By merging lysis and extraction into a single step within the reaction buffer, the patent minimizes transfer operations between tubes and containers, which are primary sources of material loss. The RNA remains in the same reaction mixture throughout, preserving quantitative integrity.
Solution Approach 2:
The patent extracts only the essential purification function needed for PCR compatibility while leaving the RNA in the original lysis mixture. This selective extraction approach removes contaminants that would inhibit PCR without requiring complete purification, thereby minimizing material loss.
3Reliability
If manual cell lysis and purification procedures are used, then RNA quality is improved, but automation capability is reduced
Solution Approach 1:
The universal reaction buffer that performs lysis, extraction, and PCR support functions in one system is designed for automated liquid handling. The standardized single-step protocol can be easily programmed into robotic systems, enabling high-throughput automation while maintaining consistent RNA quality across samples.
Solution Approach 2:
The patent optimizes buffer composition and reaction conditions to work efficiently under automated conditions. By adjusting parameters such as buffer concentration, incubation temperature, and reaction time, the protocol achieves reliable RNA processing that is compatible with automated liquid dispensing and thermal cycling systems.
4Productivity
If cell lysis is performed outside the PCR buffer, then PCR amplification efficiency is improved, but process complexity increases
Solution Approach 1:
The patent merges the lysis buffer composition with the PCR master mix, creating a unified reaction buffer. This eliminates the need for separate lysis and PCR setup steps, reducing procedural complexity while maintaining amplification efficiency through optimized buffer components that support both lysis and polymerase activity.
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
Enables efficient, high-throughput, and automated RNA expression analysis from small cell samples with improved sensitivity and reduced material loss, capable of amplifying RNA from single cells or low-abundance targets without intermediate purification steps.
Implementation Method 1
amplifying said target in said vessel by means of a polymerase chain reaction with a thermostable DNA polymerase
Implementation Method 2
one-step RT-PCR reaction buffer comprising a thermostable DNA polymerase capable of performing a one-step RT-PCR
Implementation Method 3
heating said vessel for at least 20 seconds at at least 90°C
Data Source
AI summary
The present invention in general provides a method for amplification of a target RNA, comprising the steps of (i) transfering a liquid with a first volume comprising at least one or more living cells into a vessel (ii) adding to said vessel an RT-PCR reaction buffer with a second volume, whereas said second volume is at least 2x as large as said first volume (iii) lysing said at least one or more living cells within said vessel by means of incubation for at least 20 seconds at at least 90°C, and (iv) amplifying said target by means of a one-step RT-PCR without performance of an intermediate purification step.