Related Experiment Video
Updated: Jun 28, 2026
10:27
A Fast Silver Staining Protocol Enabling Simple and Efficient Detection of SSR Markers using a Non-denaturing Polyacrylamide Gel
Published on: April 20, 2018
A rapid method for detecting and quantifying bacterial DNA in rust fungal DNA samples
1U.S. Department of Agriculture-Agricultural Research Services, Cereal Disease Laboratory, Department of Plant Pathology, University of Minnesota, St. Paul, USA. barn0107@umn.edu
Phytopathology
|October 24, 2008
Summary
A new quantitative real-time PCR assay effectively quantifies bacterial DNA contamination in rust fungal DNA samples. This method offers higher sensitivity than traditional counts for ensuring accurate fungal DNA sequencing.
Area of Science:
- Molecular Biology
- Mycology
- Genomics
Background:
- Bacterial DNA contamination complicates rust fungus DNA sequencing and assembly.
- Accurate quantification of bacterial DNA is crucial for reliable genomic studies.
Purpose of the Study:
- To develop and validate a quantitative real-time PCR (qPCR) assay for bacterial DNA quantification in rust fungal DNA samples.
- To compare the qPCR assay's performance against traditional CFU counts.
Main Methods:
- Development of a specific qPCR assay targeting bacterial DNA.
- Comparison of qPCR results with Colony Forming Unit (CFU) counts.
- Testing the assay's reliability using spiked samples with known amounts of *Escherichia coli* DNA.
Main Results:
- The qPCR assay demonstrated higher sensitivity in detecting bacterial DNA contamination compared to CFU counts.
- The assay reliably quantified bacterial contamination at levels greater than or equal to 1.0%.
- Spiking samples with *E. coli* DNA improved quantification of low-level contamination (<1.0%) by preventing fungal DNA amplification.
Conclusions:
- The developed qPCR assay is a sensitive and reliable tool for quantifying bacterial DNA contamination in rust fungal samples.
- The qPCR method provides more accurate contamination values than CFU counts.
- The assay, particularly with sample spiking, enables accurate quantification even at low contamination levels, crucial for downstream genomic applications.
Related Concept Videos
01:25Rapid Identification of Pathogens
MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...
01:24DNA Isolation
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...