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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...
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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...
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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...
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Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
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La resistencia a los antibióticos es antigua.

Vanessa M D'Costa1, Christine E King, Lindsay Kalan

  • 1Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada, L8N 3Z5.

Nature
|September 2, 2011
PubMed
Resumen
Este resumen es generado por máquina.

La resistencia a los antibióticos es un fenómeno natural, anterior a la medicina moderna. El análisis de ADN antiguo revela diversos genes de resistencia en el permafrost de 30.000 años de antigüedad, lo que desafía la visión de la resistencia como un problema moderno.

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Área de la Ciencia:

  • Microbiología Microbiología.
  • Genética La genética.
  • La paleogenómica es la paleogenómica.

Sus antecedentes:

  • Los antibióticos revolucionaron la medicina, pero su uso siempre ha estado acompañado por el surgimiento de microbios resistentes.
  • El surgimiento de la resistencia a los antibióticos en las bacterias patógenas a menudo se considera un fenómeno moderno.
  • Las colecciones microbianas de la era pre-antibiótica suelen exhibir una alta susceptibilidad a los antibióticos.

Objetivo del estudio:

  • Para investigar los orígenes históricos de la resistencia a los antibióticos.
  • Para determinar si los genes de resistencia a los antibióticos existían antes del uso clínico generalizado de los antibióticos.
  • Para analizar el ADN antiguo en busca de evidencia de mecanismos de resistencia a los antibióticos.

Principales métodos:

  • Análisis metagenómico dirigido de ADN antiguo.
  • Extracción y análisis de ADN de sedimentos de permafrost beringio de hace 30.000 años.
  • Estudios estructurales y funcionales de elementos de resistencia identificados, incluido el elemento de resistencia a la vancomicina VanA.

Principales resultados:

  • Identificación de una variada gama de genes que confieren resistencia a los antibióticos beta-lactam, tetraciclina y glicopéptido en el ADN antiguo.
  • Confirmación de que el antiguo elemento de resistencia a la vancomicina VanA es estructuralmente y funcionalmente similar a las variantes modernas.
  • Demostración de la presencia de genes de resistencia a los antibióticos anteriores a la era de los antibióticos.

Conclusiones:

  • La resistencia a los antibióticos es un fenómeno natural con profundas raíces evolutivas.
  • El uso generalizado de antibióticos modernos no es el único impulsor de la resistencia a los antibióticos.
  • Las antiguas comunidades microbianas poseían mecanismos sofisticados para la resistencia a los antibióticos.