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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...
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

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...
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
Infection01:20

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...

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Related Experiment Video

Updated: May 20, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

MRSA virulence and spread.

Michael Otto1

  • 1Pathogen Molecular Genetics Section, Laboratory of Human Bacterial Pathogenesis, National Institute of Allergy and Infectious Diseases, The National Institutes of Health, Bethesda, MD 20892, USA. motto@niaid.nih.gov

Cellular Microbiology
|July 4, 2012
PubMed
Summary
This summary is machine-generated.

Methicillin-resistant Staphylococcus aureus (MRSA) causes frequent infections. Understanding the molecular factors driving MRSA spread is crucial for developing effective treatments against these antibiotic-resistant bacteria.

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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

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Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
07:10

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Molecular Biology

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant cause of hospital- and community-acquired infections.
  • MRSA's resistance to beta-lactam antibiotics complicates treatment, often necessitating the use of less effective drugs like vancomycin.
  • MRSA strains possess virulence factors, including toxins and adhesion proteins, contributing to infection severity.

Purpose of the Study:

  • To explore the molecular events and genetic adaptations underlying MRSA epidemic waves.
  • To investigate the factors contributing to the increased virulence and colonization capabilities of emerging MRSA clones.
  • To identify the molecular mechanisms driving the spread of both hospital- and community-associated MRSA.

Main Methods:

  • Review of recent findings on MRSA molecular epidemiology.
  • Analysis of genetic elements and gene expression adaptations in MRSA.
  • Examination of virulence factors such as Panton-Valentine leukocidin and core genome-encoded toxins.

Main Results:

  • Newly emerging MRSA clones exhibit enhanced virulence or colonization traits.
  • Mobile genetic elements and altered gene expression are implicated in MRSA's adaptive success.
  • Panton-Valentine leukocidin acquisition and increased toxin expression are associated with community-associated MRSA success.

Conclusions:

  • The molecular basis for MRSA epidemic spread remains incompletely understood.
  • Further research is essential to elucidate the mechanisms driving MRSA dissemination.
  • Understanding these factors is critical for combating MRSA infections effectively.