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Secuencia completa del genoma y perfil de transcripción de la fase lítica de un Coccolithovirus
William H Wilson1, Declan C Schroeder, Michael J Allen
1Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK. whw@pml.ac.uk
Science (New York, N.Y.)
|August 16, 2005
Resumen
Los coccolitovirus, que infectan a las algas marinas Emiliania huxleyi, poseen genes únicos para la biosíntesis de ceramida y la transcripción viral. La mayoría de los genes virales se expresan durante la infección, revelando una nueva biología viral.
Área de la Ciencia:
- Virología marina virología marina.
- La genómica microbiana es la genómica microbiana.
- Biología de las algas Biología de las algas.
Sus antecedentes:
- El género Coccolithovirus comprende virus que infectan a Emiliania huxleyi, una microalga marina de importancia mundial.
- E. huxleyi juega un papel crucial en los ecosistemas marinos y el ciclo global del carbono.
Objetivo del estudio:
- Para investigar el contenido genómico y la expresión génica del Coccolithovirus durante la infección lítica.
- Identificar nuevos genes y funciones biológicas dentro del genoma del Coccolithovirus.
Principales métodos:
- Análisis genómico del Coccolithovirus.
- Análisis transcriptómico de microarray de E. huxleyi.yi. infectado.
Principales resultados:
- El genoma del Coccolithovirus contiene genes inesperados, incluidos los de la biosíntesis de ceramida (un esfingolipido que induce la apoptosis) y seis subunidades de ARN polimerasa.
- Un nuevo promotor sugiere que el virus codifica su propia maquinaria de transcripción.
- El análisis de microarrays mostró que el 65% de los genes virales predichos se expresan durante la infección lítica.
Conclusiones:
- Coccolithovirus posee una composición genética única con implicaciones para la apoptosis de la célula huésped y la transcripción viral.
- El virus expresa activamente una porción significativa de su genoma durante la infección, lo que pone de relieve las complejas interacciones entre virus y huésped.
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