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Picobilifitas: un grupo de algas picoplanctónicas marinas con afinidades desconocidas con otros eucariotas
Fabrice Not1, Klaus Valentin, Khadidja Romari
1Station Biologique de Roscoff, UMR 7144 CNRS and Université Pierre et Marie Curie, Boîte Postale 74, 29682 Roscoff Cedex, France. not@icm.csic.es
Science (New York, N.Y.)
|January 16, 2007
Resumen
Los científicos descubrieron un nuevo grupo de pequeñas algas, llamadas picobilifitas, en el océano. Estos picobilifitos (grupo de algas picoplanctónicas) poseen características únicas que sugieren que son algas endosimbióticas secundarias.
Área de la Ciencia:
- Biología marina Biología marina.
- Microbiología Microbiología.
- La diversidad de los eucariotas.
Sus antecedentes:
- La secuenciación ambiental revela una amplia diversidad de picoplancton eucariota.
- Un nuevo grupo de algas picoplanctónicas fue identificado inicialmente a través de secuencias de ADN ribosomal 18S (ADNr).
Objetivo del estudio:
- Para caracterizar un grupo de algas picoplanctónicas recientemente detectado.
- Para investigar las características celulares y genéticas de este nuevo grupo de algas.
Principales métodos:
- Las sondas dirigidas al ARN ribosomal (ARNr) y la amplificación de la señal tiramida-fluorescente en hibridación in situ (TSA-FISH).
- Citometría de flujo para la clasificación celular basada en señales de fluorescencia.
- 4',6'-diamidino-2-fenilindole (DAPI) coloración para la visualización de los orgánulos.
Principales resultados:
- El grupo de algas exhibió un cuerpo parecido a una orgánula con fluorescencia naranja, lo que indica phycobilins.
- Las células clasificadas contenían un orgánulo teñido de DAPI que se parecía a un plástido con un nucleomorfo.
- Estas características sugieren un origen endosimbiótico secundario.
Conclusiones:
- Las algas recién identificadas, llamadas picobilifitas, representan un descubrimiento potencialmente significativo en la diversidad eucariota marina.
- Los picobilifitos muestran características consistentes con la endosimbiosis secundaria.
- Se necesita más investigación, incluido el aislamiento de células vivas, para la descripción formal.
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