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Related Concept Videos

DNA Isolation01:24

DNA 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...

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DNA extraction protocol for rapid PCR detection of pathogenic bacteria.

Jeffrey D Brewster1, George C Paoli

  • 1Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 600 E. Mermaid Lane, Philadelphia, PA 19118, USA.

Analytical Biochemistry
|July 23, 2013
PubMed
Summary

A new DNA extraction method using 5× HotSHOT+Tween reagent enables sensitive PCR detection of foodborne bacteria. This rapid, single-tube protocol minimizes inhibition and improves DNA recovery for accurate pathogen identification.

Keywords:
BacteriaDNA extractionEscherichia coli O157:H7Listeria monocytogenesPCR

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Area of Science:

  • Food Microbiology
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Accurate detection of foodborne pathogens like Listeria monocytogenes and Escherichia coli O157:H7 is crucial for public health.
  • Existing DNA extraction methods for Polymerase Chain Reaction (PCR) often suffer from inhibition and differential recovery rates between Gram-positive and Gram-negative bacteria.

Purpose of the Study:

  • To evaluate twelve reagents for a direct DNA extraction method optimized for PCR detection of foodborne bacterial pathogens.
  • To identify a reagent that minimizes PCR inhibition and ensures efficient DNA recovery from both Gram-positive and Gram-negative bacteria.

Main Methods:

  • Evaluation of twelve different reagents for direct DNA extraction.
  • Testing DNA extraction efficiency and PCR inhibition using Listeria monocytogenes (Gram-positive) and Escherichia coli O157:H7 (Gram-negative).
  • Development and optimization of a single-tube DNA extraction protocol.

Main Results:

  • Most evaluated reagents showed significant PCR inhibition and reduced DNA recovery, particularly for Gram-positive bacteria.
  • The 5× HotSHOT+Tween reagent demonstrated minimal PCR inhibition and high DNA extraction efficiency for both tested bacterial species.
  • A 15-minute, single-tube DNA extraction protocol was established using the 5× HotSHOT+Tween reagent.

Conclusions:

  • The 5× HotSHOT+Tween reagent provides a robust and efficient method for direct DNA extraction for sensitive PCR assays.
  • This optimized protocol facilitates unbiased detection and quantitation of foodborne pathogens, including Gram-positive and Gram-negative bacteria.
  • The developed method is suitable for rapid and highly sensitive quantitative PCR (qPCR) applications in food safety testing.