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Los genes CslF similares a la celulosa sintetasa median en la síntesis de las paredes celulares (1,3;1,4)
Rachel A Burton1, Sarah M Wilson, Maria Hrmova
1Australian Centre for Plant Functional Genomics; School of Agriculture, Food, and Wine; University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia.
Science (New York, N.Y.)
|April 1, 2006
Resumen
Los investigadores identificaron genes CslF específicos parecidos a la sintetasa de la celulosa del arroz, que son responsables de la síntesis de los (1,3;1,4) -beta-d-glucanos. Estos hallazgos proporcionan evidencia directa de la función de estos genes en la biosíntesis de la pared celular de las plantas.
Área de la Ciencia:
- Biología Vegetal Biología Vegetal Biología Vegetal
- Genética molecular La genética molecular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las hierbas y los cereales poseen (1,3;1,4)-beta-d-glucanos en sus paredes celulares, cruciales para el valor comercial.
- La base genética para la biosíntesis de (1,3;1,4)-beta-d-glucano en las plantas sigue siendo incompletamente entendida.
Objetivo del estudio:
- Para identificar los genes específicos involucrados en la síntesis de (1,3;1,4)-beta-d-glucano en los cereales.
- Proporcionar evidencia funcional directa para los candidatos genéticos en la producción de polisacáridos en la pared celular de las plantas.
Principales métodos:
- Se empleó genómica comparativa para vincular los loci de rasgos cuantitativos en la cebada con los genes del arroz.
- Los genes CslF del arroz se insertaron en Arabidopsis a través de la transformación genética.
- Se utilizaron anticuerpos monoclonales y ensayos enzimáticos para detectar (1,3;1,4) -beta-d-glucanos en la Arabidopsis transgénica.
Principales resultados:
- Se identificó un grupo de genes CslF similares a la sintetasa de celulosa de arroz como un importante locus de rasgo cuantitativo para el contenido de (1,3;1,4)-beta-d-glucano en la cebada.
- Las plantas transgénicas de Arabidopsis que expresan los genes CslF del arroz acumulan (1,3;1,4)-beta-d-glucanos en sus paredes celulares.
- La Arabidopsis de tipo salvaje, que carece de genes CslF, no producía estos beta-glucanos específicos.
Conclusiones:
- Los genes CslF del arroz están directamente implicados en la biosíntesis de los (1,3;1,4) -beta-d-glucanos.
- Este estudio proporciona evidencia definitiva de ganancia de función para el papel de los genes CslF en la producción de estos importantes componentes de la pared celular.
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