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Related Concept Videos

Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
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Modern Molecular Taxonomy

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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Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
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Related Experiment Video

Updated: Jun 22, 2026

Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
08:51

Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)

Published on: November 4, 2016

[Methicillin resistant Staphylococcus aureus: phenotypic and genotypic studies].

M Jemili-Ben Jomaa1, I Boutiba-Ben Boubaker, Saïda Ben Redjeb

  • 1Laboratoire de recherche Résistances aux antibiotiques, Faculté de Médecine de Tunis.

La Tunisie Medicale
|May 29, 2009
PubMed
Summary

This study investigated Methicillin-Resistant Staphylococcus aureus (MRSA) epidemiology. Phenotypic methods combined with Random Amplified Polymorphic DNA (RAPD) fingerprinting effectively typed MRSA strains.

Related Experiment Videos

Last Updated: Jun 22, 2026

Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
08:51

Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)

Published on: November 4, 2016

Area of Science:

  • Microbiology
  • Epidemiology
  • Molecular Biology

Context:

  • Staphylococcus aureus is a significant human opportunistic pathogen.
  • Increasing rates of methicillin resistance contribute to morbidity and mortality.
  • Understanding MRSA epidemiology is crucial for infection control.

Purpose:

  • To evaluate the epidemiologic situation of Methicillin-Resistant Staphylococcus aureus (MRSA) at Charles Nicolle hospital.
  • To assess the utility of phenotypic methods and RAPD fingerprinting for MRSA typing.

Summary:

  • A four-year retrospective study identified 65 MRSA isolates.
  • Methicillin resistance was confirmed via mec A PCR.
  • Random Amplified Polymorphic DNA (RAPD) using ERIC-IR revealed 7 genotypes despite biotypic similarity.

Impact:

  • Phenotypic methods and RAPD fingerprinting offer a routine approach for MRSA typing.
  • Further investigation into the phylogenetic relationships of MRSA strains is warranted.
  • This research contributes to the understanding of MRSA epidemiology and typing methodologies.