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Video Experimental Relacionado

Updated: Nov 7, 2025

Deciphering and Imaging Pathogenesis and Cording of Mycobacterium abscessus in Zebrafish Embryos
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Evolución patógena gradual del Mycobacterium abscessus

Josephine M Bryant1,2, Karen P Brown1,3, Sophie Burbaud1

  • 1Molecular Immunity Unit, University of Cambridge Department of Medicine, MRC Laboratory of Molecular Biology, Cambridge, UK.

Science (New York, N.Y.)
|April 30, 2021
PubMed
Resumen

Mycobacterium abscessus desarrolla patogenicidad a través de la transferencia horizontal de genes y mutaciones, afectando a los pacientes con fibrosis quística. Las intervenciones como el tratamiento temprano pueden limitar la propagación de patógenos micobacterianos en evolución.

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Área de la Ciencia:

  • Microbiología
  • Biología evolutiva
  • La genética

Sus antecedentes:

  • La mayoría de las micobacterias son saprofitas ambientales, pero algunas, como Mycobacterium tuberculosis, causan enfermedades humanas.
  • La aparición de Mycobacterium abscessus en pacientes con fibrosis quística (FC) ofrece información sobre la evolución patógena de las micobacterias.

Objetivo del estudio:

  • Para definir los pasos generalizables en la evolución patógena de las micobacterias.
  • Comprender los mecanismos que impulsan el aumento de la patogenicidad de las micobacterias ambientales en los huéspedes humanos.

Principales métodos:

  • Análisis de la propagación y evolución de Mycobacterium abscessus en la población mundial de fibrosis quística.
  • Investigación de la transferencia horizontal de genes y las subsiguientes mutaciones genéticas que influyen en la virulencia.
  • Análisis comparativo con el desarrollo de Mycobacterium tuberculosis.

Principales resultados:

  • Los modificadores epigenéticos adquiridos a través de la transferencia horizontal de genes conducen a aumentos significativos en el potencial patógeno.
  • La evolución paralela en las infecciones pulmonares crónicas conduce a un rápido aumento de la virulencia a través de mutaciones específicas de la red génica.
  • Las mutaciones favorecen el crecimiento intracelular (macrófagos), pero reducen la supervivencia en los fomitos, lo que limita la evolución con la transmisión indirecta.

Conclusiones:

  • La evolución patógena en las micobacterias implica etapas distintas, incluida la adquisición de modificadores epigenéticos y la adaptación a los entornos del huésped.
  • Se observa una evolución restringida con la transmisión indirecta, pero la transmisión directa (como la M. tuberculosis) puede acelerar la adaptación.
  • El tratamiento precoz y el control de la infección son cruciales para limitar la propagación de patógenos micobacterianos actuales y emergentes.