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Related Concept Videos

Inhibitors of Bacterial DNA Synthesis01:28

Inhibitors of Bacterial DNA Synthesis

Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...
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...
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...
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...

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Related Experiment Videos

[Streptococcus agalactiae highly resistant to fluoroquinolones].

Elisenda Miró1, Montserrat Rebollo, Alba Rivera

  • 1Servicio de Microbiología, Hospital de la Santa Creu i Sant Pau, Barcelona, España.

Enfermedades Infecciosas Y Microbiologia Clinica
|November 28, 2006
PubMed
Summary

Two fluoroquinolone-resistant Streptococcus agalactiae strains were identified in Spain, exhibiting specific genetic mutations. This marks the first documented instance of high-level fluoroquinolone resistance in this pathogen within Spain.

Related Experiment Videos

Area of Science:

  • Microbiology
  • Antimicrobial Resistance
  • Molecular Biology

Context:

  • Streptococcus agalactiae (Group B Streptococcus) is a significant human pathogen.
  • While penicillin remains effective, resistance to other antibiotics like macrolides and fluoroquinolones is emerging.
  • Monitoring antimicrobial resistance patterns is crucial for effective treatment strategies.

Purpose:

  • To report the detection and characterization of fluoroquinolone-resistant Streptococcus agalactiae strains.
  • To identify the specific genetic mutations conferring fluoroquinolone resistance in these strains.
  • To document the first occurrence of high-level fluoroquinolone resistance in S. agalactiae in Spain.

Summary:

  • Two strains of Streptococcus agalactiae exhibiting high-level resistance to fluoroquinolones were identified in Spain between 2003 and 2004.
  • These resistant strains possessed specific point mutations in the parC (Ser79Phe) and gyrA (Glu85Ala or Glu85Lys) genes.
  • This finding represents the initial report of fluoroquinolone-resistant S. agalactiae in the Spanish population.

Impact:

  • Highlights the emergence of fluoroquinolone resistance in Streptococcus agalactiae.
  • Provides critical genetic data on resistance mechanisms for surveillance and therapeutic guidance.
  • Underscores the need for ongoing monitoring of antimicrobial susceptibility in clinical isolates.