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La evolución de la regulación de la transcripción de Mycobacterium tuberculosis está asociada con un aumento de la
Peter H Culviner1, Abigail M Frey1, Qingyun Liu2
1Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA.
Cell
|October 1, 2025
Resumen
La expresión del gen de virulencia de Mycobacterium tuberculosis (Mtb) varía significativamente. Las variantes que disminuyen los factores de virulencia clave (EsxA/EsxB) se correlacionan con un aumento de la transmisibilidad de Mtb, especialmente en las cepas resistentes a los medicamentos.
Área de la Ciencia:
- La genómica
- Microbiología
- Inmunología
Sus antecedentes:
- La Mycobacterium tuberculosis (Mtb) exhibe una virulencia y una capacidad de transmisión diversas.
- Comprender la base genética de la variación fenotípica de Mtb es crucial para el control de la enfermedad.
Objetivo del estudio:
- Identificar las variantes genéticas bacterianas que contribuyen a la diversidad fenotípica de Mtb.
- Para vincular la variación transcripcional y genética con los rasgos epidemiológicos.
Principales métodos:
- Desarrollo de nuevas herramientas de secuenciación de ARN (ARN-seq) y filogenómica.
- Se analizaron transcriptomas de cientos de aislamientos clínicos de Mtb.
- Variantes genéticas asociadas con rasgos epidemiológicos.
Principales resultados:
- Se descubrió una diversidad significativa en la expresión génica de virulencia de Mtb en 274 aislamientos clínicos.
- Variantes identificadas relacionadas con la disminución de la expresión de EsxA (Esat6) y EsxB (Cfp10).
- Se encontró que estas variantes se asocian con un aumento de la transmisibilidad de Mtb en más de 55,000 aislamientos, particularmente en cepas resistentes a los medicamentos.
Conclusiones:
- La expresión génica de virulencia de Mtb está evolucionando, potencialmente impulsada por presiones selectivas relacionadas con los medicamentos.
- Los hallazgos plantean preocupaciones con respecto a la utilidad de EsxA/EsxB como objetivos para el inmunodiagnóstico y las vacunas.
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