Automated Nucleic Acid Extraction from FFPE Tissue Slides
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Solution Overview
Problem
The extraction of nucleic acids from formalin-fixed paraffin-embedded (FFPE) tissue samples is laborious, time-consuming, and lacks standardization, often resulting in sample loss and the need for hazardous chemicals, making it difficult for molecular analysis, especially with small or rare samples.
Innovation Solution
An automated method using an automated staining machine for nucleic acid extraction, which includes deparaffinization, antigen retrieval, protease treatment, and elution, eliminating the need for manual handling and hazardous chemicals, and allowing for simultaneous processing of multiple slides in a few hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual extraction methods are used, then flexibility in handling different samples is maintained, but labor time and risk of sample loss increase
Solution Approach 1:
The system performs automated deparaffinization, antigen retrieval, and nucleic acid extraction without requiring continuous manual intervention. The automated staining machine executes the entire workflow autonomously, eliminating repetitive manual operations while maintaining processing flexibility across different sample types.
Solution Approach 2:
Manual mechanical scraping and handling operations are replaced by an automated liquid handling system that uses controlled reagent dispensing and automated slide processing. This substitution eliminates manual labor while preserving the ability to handle various sample formats.
2Ease of manufacture
If commercial extraction kits are used, then extraction capability is provided, but cost and chemical exposure increase
Solution Approach 1:
The method extracts and removes hazardous chemicals (such as xylene) from the extraction workflow by replacing them with water-based or less toxic alternatives. The essential extraction capability is preserved through automated reagent delivery systems that use safer chemistry while maintaining nucleic acid recovery efficiency.
Solution Approach 2:
The system changes the chemical parameters of the extraction process by using automated reagent formulations that are less hazardous than traditional manual kit chemicals. Temperature, time, and reagent concentration parameters are precisely controlled to achieve effective extraction with reduced chemical exposure.
3Ease of operation
If scraping method is used, then tissue transfer is achieved, but sample loss and degradation increase
Solution Approach 1:
Manual scraping is replaced by an automated system that maintains tissue sections on slides throughout the extraction process. Reagents are delivered directly to the tissue on the slide, eliminating the need for physical transfer and preventing sample loss or degradation associated with scraping operations.
Solution Approach 2:
The system performs deparaffinization and extraction steps while the tissue remains secured on the slide, preparing and processing the sample in its original position. This preliminary action prevents sample loss by eliminating transfer steps that could result in degradation or loss of precious tissue material.
4Reliability
If overnight enzymatic digestion is used, then complete digestion is achieved, but processing time increases
Solution Approach 1:
The enzymatic digestion is performed in controlled periodic cycles with optimized duration and temperature conditions. The automated system delivers protease reagents at precise intervals and maintains optimal conditions to achieve complete digestion in a fraction of the traditional overnight time, balancing completeness with efficiency.
Solution Approach 2:
The system changes the parameters of enzymatic digestion by controlling temperature, reagent concentration, and exposure time to achieve rapid yet complete digestion. Automated delivery ensures precise parameter control that maintains digestion effectiveness while reducing total processing time from overnight to hours.
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
This method provides higher-quality and less-degraded nucleic acids, reducing labor and chemical exposure, and enabling efficient molecular analysis from small or previously stained tissue samples, with improved yield and reduced degradation, suitable for various downstream applications like PCR and sequencing.
Implementation Method 1
The methods feature a deparaffinization step, an antigen retrieval step, a protease treatment step, and an elution step
Implementation Method 2
Without wishing to limit the present invention to any theory or mechanism, it is surprising that an antigen retrieval step, which is typically used just during immunohistochemistry (IHC) procedures, is beneficial for automated nucleic acid extraction
Implementation Method 3
a protease treatment step
Implementation Method 4
an elution step (e.g., a heat step) for eluting DNA or RNA from the tissue
Data Source
AI summary
Automated methods for extracting nucleic acid from one or more tissue samples disposed on slides are disclosed. The methods utilize an automated slide staining apparatus that dispenses a plurality of nucleic acid extraction reagents onto the tissue sample, thus creating an extracted nucleic acid sample. The extracted nucleic acid sample may be used directly in downstream applications such as nucleic acid amplification or sequencing procedures, or may be further purified.