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Related Concept Videos

DNA Isolation01:24

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DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...
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Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
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Related Experiment Video

Updated: Apr 6, 2026

DNA Extraction from Paraffin Embedded Material for Genetic and Epigenetic Analyses
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Optimizing Storage and Handling of DNA Extracts.

S B Lee1, C A Crouse2, M C Kline3

  • 1Forensic Science Program, Justice Studies Department, San Jose State University, San Jose, CA, USA.

Forensic Science Review
|August 6, 2015
PubMed
Summary

Proper nucleic acid sample storage is crucial for forensic and genetic labs. Optimal methods ensure DNA/RNA stability for reliable analysis and retesting of critical genetic markers.

Keywords:
DNA storageFTASample matrixtrehalose

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Millions of biological samples (cells, viruses, DNA/RNA) are stored annually for diagnostics, research, and forensic applications.
  • Polymerase Chain Reaction (PCR) enables analysis of minute sample quantities, but low-quality/quantity DNA/RNA from sources like bone, teeth, or touch samples presents challenges.
  • Degradation, inhibitors, low quantity, and contamination can lead to amplification failure, necessitating efficient storage for retesting.

Purpose of the Study:

  • To review the critical importance of nucleic acid sample storage in forensic and non-forensic databanks.
  • To examine factors influencing DNA/RNA stability during storage.
  • To explore current and emerging strategies and technologies for optimal DNA/RNA storage.

Main Methods:

  • Literature review focusing on forensic DNA storage, factors affecting DNA stability, and molecular typing strategies for suboptimal DNA.
  • Analysis of mechanisms responsible for DNA/RNA loss during storage.
  • Examination of various storage strategies and technologies.

Main Results:

  • Refrigerated liquid DNA extracts and samples undergoing freeze-thaw cycles show reduced recovery rates.
  • Degraded, low-quantity, or contaminated samples pose significant challenges for DNA/RNA amplification and profile recovery.
  • Effective storage is essential for maintaining sample integrity for future analyses, including CODIS STRs, mtDNA, YSTRs, and mRNA.

Conclusions:

  • Optimal storage and amplification methods are critical for successful recovery of genetic profiles from challenging samples.
  • Maintaining sample stability over time is paramount for ensuring the reliability of forensic and genetic analyses.
  • Continued development of storage technologies is needed to address the challenges of preserving low-quality and low-quantity nucleic acid samples.