DNA Specimen Preservation Using DESS and DNA Extraction in Museum Collections

Area of Science:

• Museum studies
• Molecular biology
• Taxonomy

Background:

• DNA analysis is crucial for taxonomy and biodiversity.
• Current reliance on -80°C freezers for DNA preservation is costly and space-intensive.
• There is a need for accessible DNA preservation methods for museum specimens.

Purpose of the Study:

• To evaluate DESS (DMSO/EDTA/saturated NaCl solution) as an alternative DNA preservation method.
• To compare DESS preservation with traditional methods for both morphology and DNA integrity.
• To assess the long-term effectiveness of DESS at room temperature.

Main Methods:

• Museum specimens from diverse taxonomic groups were preserved using DESS and traditional methods.
• Morphological features and DNA integrity were analyzed comparatively.
• DNA integrity was assessed using fragment size analysis, with fragments >15 kb considered high-quality.

Main Results:

• DESS preservation maintained high-quality DNA (>15 kb) at room temperature across various species.
• Nematode DNA integrity was preserved for up to 10 years using DESS.
• Morphological preservation varied by species, but DNA integrity remained even after DESS evaporation.

Conclusions:

• DESS is an effective method for preserving DNA in museum specimens at room temperature.
• This method offers a viable alternative to freezer storage, reducing costs and space requirements.
• DESS is suitable for both long-term storage and temporary preservation before freezing.