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Los orígenes de las arquebacterias y los eucariotas.
Nature
|September 18, 1980
Resumen
El estudio desafía el dominio Archaebacteria propuesto, sugiriendo en cambio que estos microbios antiguos evolucionaron de otras bacterias. Este punto de vista alternativo propone que las arquebacterias contienen el antepasado de la primera célula eucariota.
Área de la Ciencia:
- Microbiología Microbiología.
- Biología evolutiva Biología evolutiva.
- La genómica es la genómica.
Sus antecedentes:
- La comprensión actual de la filogenia procariótica es limitada.
- La propuesta de Woese identifica a las arquebacterias como un linaje distinto y antiguo igual en edad y diversidad a otras bacterias.
- Las críticas existentes a esta propuesta son insuficientes.
Objetivo del estudio:
- Para analizar críticamente la filogenia propuesta de los procariotas.
- Presentar un modelo evolutivo alternativo para las arquebacterias.
- Para investigar el origen de las primeras células eucariotas.
Principales métodos:
- Análisis filogenético de linajes procariotas.
- Análisis genómico comparativo.
- Modelado de la evolución.
Principales resultados:
- La evidencia sugiere que las arquebacterias no son un dominio primario, sino que evolucionaron a partir de otros grupos bacterianos.
- El modelo propuesto indica que las arquebacterias albergan el progenitor de la primera célula eucariota.
- Esto desafía la profunda divergencia evolutiva de las arquebacterias.
Conclusiones:
- Es probable que las arquebacterias surgieran dentro del dominio bacteriano.
- El antepasado de los eucariotas puede haberse originado de una célula Archaebacterial.
- Se propone un modelo revisado de la evolución de la vida temprana.
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