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Restricción de un retrovirus extinguido por la proteína antiviral humana TRIM5alpha
Shari M Kaiser1, Harmit S Malik, Michael Emerman
1Molecular and Cellular Biology Program, University of Washington, Seattle, WA 98195, USA.
Science (New York, N.Y.)
|June 26, 2007
Resumen
Los investigadores resucitaron una antigua proteína del virus del chimpancé. Descubrieron que el TRIM5alpha humano puede bloquear este virus, pero los cambios evolutivos pueden aumentar la susceptibilidad al VIH-1.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- Virología Virología.
- La genómica es la genómica.
Sus antecedentes:
- Los genomas de los primates albergan retrovirus endógenos.
- Las proteínas como TRIM5alpha proporcionan inmunidad intrínseca contra las infecciones retrovirales.
- La dinámica evolutiva de las interacciones huésped-virus es crucial para comprender la inmunidad.
Objetivo del estudio:
- Para resucitar y caracterizar una antigua proteína retroviral endógena del genoma del chimpancé.
- Para investigar la actividad antiviral del TRIM5alpha humano contra este virus resucitado.
- Explorar las posibles compensaciones evolutivas en el TRIM5alpha humano que confiere resistencia a los virus antiguos pero susceptibilidad a los modernos como el VIH-1.
Principales métodos:
- Análisis bioinformático de los genomas de los primates.
- Técnicas de resurrección genética para reconstruir antiguas proteínas virales.
- Ensayos antivirales in vitro para probar la actividad de TRIM5alpha.
- Análisis genómico comparativo de la evolución de TRIM5alpha.
Principales resultados:
- La proteína del núcleo de un virus endógeno de chimpancé de 4 millones de años de antigüedad fue resucitada con éxito.
- TRIM5alpha humano demostró actividad en la prevención de la infección por el virus resucitado.
- La evidencia sugiere que las adaptaciones humanas específicas en TRIM5alpha pueden haber aumentado inadvertidamente la susceptibilidad al virus de la inmunodeficiencia humana tipo 1 (VIH-1).
Conclusiones:
- Los antiguos retrovirus endógenos y sus interacciones con la inmunidad del huésped proporcionan información sobre la historia evolutiva.
- El TRIM5alpha humano ha evolucionado para resistir ciertas amenazas virales antiguas.
- Las adaptaciones evolutivas para la resistencia a los virus antiguos podrían haber creado vulnerabilidades a los retrovirus modernos como el VIH-1.
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