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Preserving soil samples with DNA/RNA Shield or DESS solution is effective for molecular research. Both methods maintain DNA quality, with DESS showing closer results to liquid nitrogen snap freezing for microbial community analysis.

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Area of Science:

  • Environmental microbiology
  • Molecular ecology
  • Biorepository science

Background:

  • Effective sample preservation is crucial for molecular research, especially in remote field settings.
  • Traditional methods like snap freezing require specialized equipment, limiting accessibility.
  • Alternative preservation solutions offer potential for simplified field sample storage.

Purpose of the Study:

  • To evaluate the efficacy of DNA/RNA Shield and DESS solution for soil sample preservation.
  • To compare these solutions against snap freezing in liquid nitrogen.
  • To assess their impact on DNA quantity, integrity, and microbial community structure.

Main Methods:

  • Soil samples were stored for one month under various conditions: DNA/RNA Shield, DESS solution, no solution, and snap freezing in liquid nitrogen.
  • Storage temperatures included -20°C, +4°C, and +23°C.
  • DNA quantity, integrity, and microbial community structure (taxonomic distribution, OTU numbers) were analyzed.

Main Results:

  • DNA quantity and integrity were well-preserved across most treatments.
  • Samples stored without solution at ambient temperatures showed skewed taxonomic distribution, particularly at lower taxonomic levels.
  • DESS solution yielded sequencing output and OTU numbers closer to liquid nitrogen snap freezing.
  • DNA/RNA Shield demonstrated superior preservation of rare taxa.

Conclusions:

  • Both DNA/RNA Shield and DESS solution are viable alternatives for soil sample preservation in molecular studies.
  • DESS solution closely mimics the results of snap freezing for overall microbial community profiling.
  • DNA/RNA Shield offers an advantage in preserving the diversity of rare microbial taxa.