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Laboratory Techniques Used to Maintain and Differentiate Biotypes of Vibrio cholerae Clinical and Environmental Isolates
Published on: May 30, 2017
Un bacteriófago que codifica una isla de patogenicidad, un pilus tipo IV y un receptor de fagos en las bacterias del
D K Karaolis1, S Somara, D R Maneval
1Center for Vaccine Development, Division of Hospital Epidemiology, University of Maryland School of Medicine, Baltimore 21201, USA. karaolis@umaryland.edu
Nature
|June 9, 1999
Resumen
Las islas de patogenicidad, cruciales para la virulencia bacteriana, eran previamente poco conocidas. Este estudio revela que la isla de patogenicidad de V. cholerae (VPI) es un bacteriófago (VPIphi), detallando su transferencia y papel en la enfermedad.
Área de la Ciencia:
- Microbiología Microbiología.
- Virología Virología.
- Genética La genética.
Sus antecedentes:
- Las islas de patogenicidad (IPA) son grandes grupos de genes que codifican factores de virulencia en muchos patógenos bacterianos.
- Los orígenes y los mecanismos de transferencia de los IAP siguen siendo en gran medida desconocidos.
- Vibrio cholerae utiliza un PAI (VPI) que codifica un factor de colonización y el receptor CTXphi.
Objetivo del estudio:
- Para aclarar el origen y el mecanismo de transferencia de la isla de patogenicidad de V. cholerae (VPI).
- Investigar la naturaleza del VPI y su relación con otros elementos genéticos móviles.
- Para entender la interacción virus-virus en la patogenicidad bacteriana.
Principales métodos:
- Análisis genómico para identificar el VPI como un genoma de bacteriófago.
- Experimentos de conjugación bacteriana para demostrar la transferencia de IPV entre cepas de V. cholerae.
- Análisis de proteínas para identificar los componentes del VPI.
Principales resultados:
- La isla de patogenicidad de VPI fue identificada como el genoma de un bacteriófago filamentoso, VPIphi.
- VPIphi es transferible entre las cepas de V. cholerae.
- La subunidad TcpA del pilus corregido por toxinas es una proteína de capa VPIphi.
- Esto representa la primera descripción de un fago que codifica un receptor para otro fago.
Conclusiones:
- La isla de patogenicidad VPI es un bacteriófago (VPIphi) capaz de transferencia horizontal de genes.
- VPIphi juega un papel crítico en la patogenicidad de Vibrio cholerae mediando la colonización y las funciones de los receptores de fagos.
- Este estudio revela una nueva interacción virus-virus esencial para la virulencia bacteriana.
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