Comparison of DNA extraction methods for samples from old blood collections

Area of Science:

• Genomics
• Molecular Biology
• Biobanking

Background:

• Long-term storage of biological samples is crucial for genetic research.
• Degradation of DNA over time can impact downstream analyses.
• Evaluating DNA extraction methods from aged samples is essential.

Purpose of the Study:

• To assess the efficacy of commercial DNA extraction kits for aged whole blood samples.
• To determine the optimal kit for DNA extraction from long-term stored biobank samples.
• To confirm DNA quality from samples stored up to 18 years at -20°C.

Main Methods:

• DNA extraction from whole blood samples stored for 5-18 years at -20°C.
• Utilized four commercial kits: Quick-DNA Miniprep Plus, DNeasy Blood & Tissue, MagAttract HMW DNA, and QIAamp Blood Maxi.
• Tested diverse sample types including cord blood and partly dried adult blood.

Main Results:

• High-quality DNA was successfully extracted from all tested whole blood samples.
• Effective DNA recovery was achieved from samples stored for extended periods (up to 18 years).
• The study demonstrated the feasibility of using aged biobanked blood for DNA analysis.

Conclusions:

• Commercial DNA extraction kits can yield high-quality DNA from long-term stored whole blood.
• Biobanking of whole blood at -20°C for up to 18 years preserves DNA integrity for extraction.
• This finding supports the utility of historical blood collections in genetic research.