Rapid, Safe, and Simple Manual Bedside Nucleic Acid Extraction for the Detection of Virus in Whole Blood Samples
June 30th, 2018
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Here, we present a protocol for the rapid virus nucleic acid extraction from the virus-inactivated whole blood. The extraction is performed directly in the blood collection tubes and requires no equipment or electricity. The method is not dependent on laboratory facilities and can be used anywhere (e.g., in field hospitals).
Overview
This article presents a protocol for rapid virus nucleic acid extraction from virus-inactivated whole blood. The method can be performed without laboratory equipment or electricity, making it suitable for use in various settings, including field hospitals.
Key Study Components
Area of Science
- Virology
- Diagnostics
- Clinical Medicine
Background
- Point of care diagnostics are essential for timely treatment of viral infections.
- Traditional methods often require laboratory facilities and equipment.
- This protocol allows for immediate testing in non-traditional settings.
- Maintaining vacuum in blood collection tubes is critical for successful blood collection.
Purpose of Study
- To provide a rapid and efficient method for virus nucleic acid extraction.
- To enable diagnostics in resource-limited environments.
- To demonstrate the procedure for healthcare professionals.
Methods Used
- Preparation of blood collection tubes with lysis buffer.
- Use of a 25 gauge needle and 3ML syringe for blood collection.
- Direct extraction of nucleic acids from whole blood.
- Demonstration by medical professionals to ensure proper technique.
Main Results
- The method is effective for extracting viral nucleic acids.
- It can be performed in various settings without specialized equipment.
- Demonstrated ease of use for healthcare providers.
- Potential to improve patient outcomes through timely diagnostics.
Conclusions
- This protocol provides a viable solution for rapid viral diagnostics.
- It addresses the need for accessible testing in emergency situations.
- Future applications may include broader use in clinical settings.
Frequently Asked Questions
What is the main advantage of this extraction method?
The main advantage is that it can be performed without laboratory equipment and electricity, making it suitable for use in various settings.
Who demonstrates the blood collection procedure?
The procedure is demonstrated by Medical Doctor Anders Fomsgaard and Scientist Morten Rasmussen.
What type of blood collection tube is used?
A 4ML EDTA vacuum tube is used for blood collection.
How much lysis buffer is injected into the blood collection tube?
1.6ML of a commercial lysis buffer is injected into the tube.
Why is maintaining vacuum in the blood collection tube critical?
Maintaining vacuum is essential for successful blood collection and ensuring the integrity of the sample.
Can this method be used in field hospitals?
Yes, this method is designed to be used in field hospitals and other resource-limited environments.
Executive Industry Relevance
This bedside nucleic acid extraction method enables rapid virus detection in whole blood without laboratory infrastructure, supporting timely diagnostic decisions in outbreak settings. By eliminating equipment and electricity dependencies, it reduces barriers to molecular testing in resource-constrained environments. The approach enhances predictive confidence in early infection identification, facilitating risk containment and patient triage.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of viral presence in clinically relevant whole blood samples for target hypothesis testing.
- Operational Value: Provides a equipment-free workflow for sample preparation in decentralized discovery settings.
Screening & Assay Development
- Scientific Value: Generates purified nucleic acids compatible with downstream qPCR or LAMP assays for compound screening.
- Operational Value: Standardizes sample input through direct tube-based extraction, improving reproducibility across sites.
- Strategic Value: Supports scalable assay validation in field-applicable diagnostic pipelines.
Translational & Preclinical Research
- Scientific Value: Maintains sample integrity from collection to detection, supporting translational continuity in viral pathogenesis studies.
- Operational Value: Enables consistent nucleic acid yield across varying field conditions, reducing pre-analytical variability.
Pipeline & Workflow Integration
The method fits within early discovery workflows by providing a reliable sample preparation step prior to amplification-based detection, particularly for viral target validation in whole blood matrices.
- Discovery Biology: Supports hypothesis testing by enabling nucleic acid recovery from inactivated whole blood for pathogen detection.
- Screening: Delivers assay-ready extracts compatible with isothermal amplification, enhancing screening readiness in low-resource labs.
- Analytics: Produces quantitative nucleic acid outputs suitable for Ct-based viral load estimation in downstream qPCR or LAMP.
- Translational Research: Bridges collection and detection steps, preserving sample fidelity for preclinical validation of antiviral candidates.
- Enterprise Reuse: Represents a portable, reusable sample preparation module adaptable to multiple viral targets and detection platforms.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in viral detection by enabling direct sample-to-extract workflow without cross-contamination risks.
- Operational Value: Ensures standardization through tube-based processing, minimizing user-dependent variability in nucleic acid yield.
- Strategic Value: Accelerates go/no-go decisions in antiviral screening by reducing sample-to-result time to under 40 minutes when paired with LAMP.
- Portfolio Impact: Supports risk-adjusted prioritization of candidates by enabling rapid confirmation of target engagement in whole blood models.
Implementation Considerations
- Requires training in aseptic blood collection and magnetic bead handling techniques.
- Depends on access to commercial lysis/binding buffer, magnetic glass particles, and wash/elution buffers.
- Necessitates standardization of mixing protocols (tube flipping) across operators to ensure consistent bead binding.
- Must account for environmental factors (temperature, timing) during inactivation and extraction steps.
- Limited to downstream applications compatible with magnetic bead presence in eluate (e.g., direct LAMP/qPCR without bead removal).
Biopharma FAQs
Why does manual tube flipping ensure effective mixing during extraction?
Manual flipping five to ten times ensures homogeneous distribution of lysis buffer, magnetic glass particles, and wash solutions without equipment, enabling consistent nucleic acid binding and washing steps in the blood collection tube.
How does incubation time affect virus inactivation and nucleic acid yield?
A 20-minute room temperature incubation after blood collection ensures complete virus inactivation via lysis buffer while preserving nucleic acid integrity for subsequent extraction, as validated by downstream qPCR and LAMP detection.
What role do magnetic glass particles play in the extraction process?
Magnetic glass particles bind nucleic acids in the lysis/binding buffer and are immobilized using a magnetic holder, allowing sequential wash steps while retaining bound nucleic acids for elution.
Why is it necessary to avoid removing magnetic glass particles before downstream amplification?
The method is designed for direct transfer of a droplet of re-suspended magnetic glass particles into the amplification reaction, simplifying workflow and minimizing nucleic acid loss during processing.
What analytical outputs confirm successful nucleic acid extraction in this protocol?
Successful extraction is confirmed by detectable signals in virus-specific qPCR or LAMP assays, with lower Ct values or faster time-to-positive correlating with higher viral genome copies in spiked whole blood samples.
Chapters in this video
0:04
Title
0:44
Preparation for Virus Inactivation and Rapid Nucleic Acid Extraction
2:02
Blood Collection from Patients with Signs and Symptoms of a Virus Infection
2:50
Simplified Nucleic Acid Extraction from Whole Blood
5:04
Results: Sensitivity of the Simplified NA Extraction Method
6:22
Conclusion
