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Related Concept Videos

Modern Molecular Taxonomy01:29

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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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Methods of Classification and Identification01:28

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Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
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Applications of Molecular Taxonomy01:20

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Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
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An Allelotyping PCR for Identifying Salmonella enterica serovars Enteritidis, Hadar, Heidelberg, and Typhimurium
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Listeria environmental sampling tests are compatible with polymorphic locus sequence typing.

Tom Edlind1, Yanhong Liu2

  • 1MicrobiType LLC, Plymouth Meeting, Pennsylvania, USA.

Journal of Food Science
|June 19, 2021
PubMed
Summary
This summary is machine-generated.

Adding polymorphic locus sequence typing (PLST) to environmental sampling tests (ESTs) for Listeria monocytogenes provides valuable strain data. This enhances pathogen tracking and contamination source identification in food processing facilities.

Keywords:
LisMT2ListeriaLmiMT1environmental samplinggenotypingpolymorphic locus sequence typing

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Area of Science:

  • Food safety microbiology
  • Molecular diagnostics
  • Pathogen surveillance

Background:

  • Food processors utilize environmental sampling tests (ESTs) for pathogen detection, particularly Listeria monocytogenes.
  • Current ESTs offer convenience, speed, and cost-effectiveness for presumptive pathogen identification.

Purpose of the Study:

  • To evaluate the feasibility of integrating polymorphic locus sequence typing (PLST) with common Listeria environmental sampling tests (ESTs).
  • To determine if PLST can provide valuable strain typing data for Listeria monocytogenes tracking and source identification.

Main Methods:

  • Five commercial Listeria ESTs (broth and gel-based) were inoculated with Listeria monocytogenes and Listeria innocua strains.
  • Heat treatment inactivated bacteria, followed by DNA preparation for PCR amplification of PLST loci (LmiMT1 and LisMT2).
  • PCR products were Sanger sequenced, and phylogenetic analysis was performed.

Main Results:

  • All inoculated ESTs yielded single, clear PCR products for PLST analysis.
  • Sanger sequencing produced high-quality chromatograms, enabling accurate phylogenetic analysis.
  • Phylogenetic analysis confirmed bacterial identities and revealed strain relatedness to database sequences.

Conclusions:

  • Polymorphic locus sequence typing (PLST) is compatible with multiple environmental sampling tests (ESTs) for Listeria.
  • Integrating PLST enhances ESTs by providing crucial strain-level data for improved pathogen surveillance and control in food processing environments.