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Las bacterias que subsisten en los antibióticos.

Gautam Dantas1, Morten O A Sommer, Rantimi D Oluwasegun

  • 1Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.

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|April 5, 2008
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Las bacterias del suelo pueden crecer utilizando antibióticos como su única fuente de alimento. Este descubrimiento revela un reservorio oculto de resistencia a los antibióticos, lo que potencialmente empeora la amenaza de infecciones resistentes a los medicamentos.

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Área de la Ciencia:

  • Microbiología Microbiología.
  • Ciencias del medio ambiente Ciencias del medio ambiente.
  • Ecología Ecología Ecología.

Sus antecedentes:

  • Los antibióticos, esenciales para el tratamiento de infecciones bacterianas, son a menudo productos naturales de microorganismos.
  • Los roles ecológicos de los microorganismos productores de antibióticos en el medio ambiente no se comprenden bien.
  • La resistencia a los antibióticos es una preocupación creciente para la salud mundial.

Objetivo del estudio:

  • Investigar la capacidad de las bacterias del suelo para utilizar los antibióticos como única fuente de carbono.
  • Explorar la diversidad y los perfiles de resistencia a los antibióticos de las bacterias que consumen antibióticos.
  • Evaluar la contribución potencial de las bacterias ambientales al conjunto de determinantes de la resistencia a los antibióticos.

Principales métodos:

  • Aislamiento y cultivo de bacterias del suelo a partir de diversas muestras de suelo.
  • Probar el crecimiento de aislamientos bacterianos en 18 antibióticos diferentes como la única fuente de carbono.
  • Análisis filogenético de bacterias que degradan los antibióticos.
  • Determinación de perfiles de resistencia a antibióticos para bacterias aisladas frente a concentraciones clínicamente relevantes.

Principales resultados:

  • Se aislaron cientos de bacterias del suelo capaces de crecer con antibióticos.
  • De 13 a 17 de los 18 antibióticos probados apoyaron el crecimiento bacteriano en 11 suelos diversos.
  • Las bacterias que consumen antibióticos exhibieron una significativa diversidad filogenética, con algunas relacionadas con patógenos humanos.
  • Todos los aislados que consumen antibióticos demostraron resistencia a múltiples antibióticos en concentraciones clínicamente relevantes.

Conclusiones:

  • Las bacterias del suelo pueden metabolizar varios antibióticos, lo que indica un papel ambiental significativo para estos compuestos.
  • En los suelos existe una diversa reserva de bacterias resistentes a los antibióticos, capaces de subsistir con antibióticos.
  • Las bacterias ambientales que poseen genes de resistencia a los antibióticos pueden contribuir a la propagación de múltiples resistencias a los antibióticos en patógenos humanos.