Related Experiment Videos
Simple, rapid method for direct isolation of nucleic acids from aquatic environments
C C Somerville1, I T Knight, W L Straube
1Center of Marine Biotechnology, University of Maryland, Baltimore 21202.
Applied and Environmental Microbiology
|March 1, 1989
Summary
This study introduces a new method for concentrating aquatic microorganisms and extracting their nucleic acids. This technique enables efficient analysis of microbial DNA and RNA for ecological and phylogenetic studies.
Area of Science:
- Environmental microbiology
- Molecular biology
- Nucleic acid extraction
Background:
- Direct isolation of environmental nucleic acids is crucial for biomass estimation, organism detection, diversity assessment, and cloning.
- Traditional methods may not efficiently capture or extract nucleic acids from diverse aquatic microbial communities.
Purpose of the Study:
- To develop a streamlined method for concentrating microorganisms from aquatic samples.
- To enable efficient extraction of high-molecular-weight nucleic acids (DNA and RNA) from concentrated microbial cells.
Main Methods:
- Concentration of large-volume (350-1,000+ ml) natural water samples onto a single cylindrical filter membrane.
- In-situ cell lysis and proteolysis within the filter housing.
- Direct collection of crude, high-molecular-weight nucleic acid solutions from the filter.
Main Results:
- The method yields high-molecular-weight chromosomal DNA, plasmid DNA, and speciated RNAs.
- Extracted RNAs comigrate with 5S, 16S, and 23S ribosomal RNAs (rRNAs).
- The process is simple, rapid, economical, and effective for microbes resistant to culture.
Conclusions:
- This nucleic acid extraction method is valuable for microbial ecology and phylogeny.
- It facilitates the study of unculturable microorganisms.
- The technique provides a robust tool for environmental microbial analysis.