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Microbios del océano. Las oscilaciones transcripcionales del diel de múltiples especies en el océano abierto

Elizabeth A Ottesen¹, Curtis R Young², Scott M Gifford²

¹Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Center for Microbial Oceanography: Research and Education (C-MORE), University of Hawaii, Honolulu, HI 96822, USA. Department of Microbiology, University of Georgia, Athens, GA 30602, USA.

Science (New York, N.Y.)

|July 12, 2014

Resumen

Las bacterias oceánicas exhiben ciclos diarios de expresión génica, revelando ritmos coordinados y específicos de la población. Estos ciclos dieléctricos en los microbios heterotróficos tienen un impacto en los ecosistemas marinos y el ciclo de nutrientes.

Área de la Ciencia:

Microbiología marina microbiología marina.
Ecología molecular ecología molecular.
Oceanografía La oceanografía es la oceanografía.

Sus antecedentes:

Las oscilaciones diurnas en la transcripción génica, el metabolismo y el comportamiento son comunes en toda la vida.
Los ciclos de Diel en bacterias y arqueas heterotróficas marinas de origen natural son poco conocidos.

Objetivo del estudio:

Para investigar los patrones de transcripción del gen diel en poblaciones bacterianas oceánicas de origen natural.
Para determinar si el bacterioplancton heterotrófico exhibe ritmos diarios en la expresión génica.

Principales métodos:

Perfiles transcriptómicos de todo el genoma con resolución temporal de poblaciones bacterianas oceánicas.
Muestreo in situ durante un período de 3 días.
Análisis de la periodicidad de la expresión génica en cianobacterias y bacterias heterotróficas.

Principales resultados:

Los transcriptomas de cianobacterias mostraron la periodicidad diélica esperada.
Múltiples grupos heterotróficos de bacterioplancton mostraron inesperadamente ciclos diel significativos en las transcripciones de genes.
Diferentes grupos heterotróficos exhibieron el tiempo específico de la población de la expresión pico de transcripción para varios genes metabólicos.

Conclusiones:

Los ciclos de transcripción de genes Diel son frecuentes en las bacterias heterotróficas oceánicas, no sólo en las autótrofas.
Ondas escalonadas y multispecies de expresión génica diel pueden regular los procesos biogeoquímicos marinos.
Este estudio revela una nueva capa de regulación del diel en las comunidades microbianas marinas.

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