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Published on: November 10, 2009
Rescue of Low-Yield DNA Samples for Next-Generation Sequencing Using Vacuum Centrifugal Concentration in a Clinical
Lau K Vestergaard1, Nicolai S Mikkelsen1, Douglas V N P Oliveira1
1Molecular Unit, Department of Pathology, Herlev Hospital, University of Copenhagen, DK-2730 Herlev, Denmark.
Abstract:
The implementation of next-generation sequencing (NGS) in clinical oncology has enabled the analysis of multiple cancer-associated genes for diagnostics and treatment purposes. The detection of pathogenic and likely pathogenic mutations is crucial to manage the disease. Obtaining the mutational profile may be challenging in samples with low yields of DNA-reflected by the type of biological material, such as formalin-fixed paraffin-embedded tissue (FFPE), needle biopsies, and circulating free/tumor DNA, as well as a sparse tumor content. Moreover, standardized strict procedures for the extraction of DNA in a clinical setting might contribute to lower amounts of DNA per µL. The detection of variants in low-yield DNA samples remains a challenge in clinical diagnostics, where molecular analyses such as NGS are needed. Here, we performed vacuum centrifugation on DNA extracted from five FFPE tissue blocks, with concentrations below 0.2 ng/µL. Through NGS analysis, we found that low-yield DNA samples could be concentrated to sufficient levels, without compromising the mutational profile.
Insights
Concentrating low-yield DNA from clinical samples using vacuum centrifugation is effective for next-generation sequencing (NGS) cancer diagnostics. This method ensures sufficient DNA levels without altering the crucial mutational profile for accurate disease management.
Area of Science:
- Oncology
- Molecular Diagnostics
- Genomics
Background:
- Next-generation sequencing (NGS) is vital for cancer diagnostics and treatment selection.
- Low DNA yield from clinical samples (e.g., FFPE, biopsies) poses challenges for accurate mutational profiling.
- Standardized DNA extraction protocols can further reduce DNA concentration, complicating molecular analysis.
Purpose of the Study:
- To evaluate the efficacy of vacuum centrifugation for concentrating low-yield DNA from formalin-fixed paraffin-embedded (FFPE) tissues.
- To determine if DNA concentration via vacuum centrifugation impacts the mutational profile obtained through NGS.
- To establish a method for improving DNA suitability for NGS in challenging clinical samples.
Main Methods:
- DNA was extracted from five FFPE tissue blocks with initial concentrations below 0.2 ng/µL.
- Vacuum centrifugation was employed to concentrate the extracted low-yield DNA samples.
- Next-generation sequencing (NGS) analysis was performed on the concentrated DNA to assess mutational profiles.
Main Results:
- Vacuum centrifugation successfully concentrated DNA from low-yield FFPE samples to sufficient levels for analysis.
- NGS analysis of concentrated DNA revealed no compromise in the detected mutational profile.
- The method demonstrated the feasibility of obtaining reliable mutational data from previously challenging samples.
Conclusions:
- Vacuum centrifugation is a viable and effective technique for concentrating low-yield DNA in clinical oncology.
- This method enhances the utility of NGS for cancer diagnostics, particularly with limited or degraded DNA samples.
- The approach preserves the integrity of the mutational profile, ensuring accurate diagnostic and therapeutic insights.
