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Combinatorial genetic transformation generates a library of metabolic phenotypes for the carotenoid pathway in maize.


ABSTRACT: Combinatorial nuclear transformation is a novel method for the rapid production of multiplex-transgenic plants, which we have used to dissect and modify a complex metabolic pathway. To demonstrate the principle, we transferred 5 carotenogenic genes controlled by different endosperm-specific promoters into a white maize variety deficient for endosperm carotenoid synthesis. We recovered a diverse population of transgenic plants expressing different enzyme combinations and showing distinct metabolic phenotypes that allowed us to identify and complement rate-limiting steps in the pathway and to demonstrate competition between beta-carotene hydroxylase and bacterial beta-carotene ketolase for substrates in 4 sequential steps of the extended pathway. Importantly, this process allowed us to generate plants with extraordinary levels of beta-carotene and other carotenoids, including complex mixtures of hydroxycarotenoids and ketocarotenoids. Combinatorial transformation is a versatile approach that could be used to modify any metabolic pathway and pathways controlling other biochemical, physiological, or developmental processes.

SUBMITTER: Zhu C 

PROVIDER: S-EPMC2587607 | biostudies-literature | 2008 Nov

REPOSITORIES: biostudies-literature

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Combinatorial genetic transformation generates a library of metabolic phenotypes for the carotenoid pathway in maize.

Zhu Changfu C   Naqvi Shaista S   Breitenbach Jürgen J   Sandmann Gerhard G   Christou Paul P   Capell Teresa T  

Proceedings of the National Academy of Sciences of the United States of America 20081114 47


Combinatorial nuclear transformation is a novel method for the rapid production of multiplex-transgenic plants, which we have used to dissect and modify a complex metabolic pathway. To demonstrate the principle, we transferred 5 carotenogenic genes controlled by different endosperm-specific promoters into a white maize variety deficient for endosperm carotenoid synthesis. We recovered a diverse population of transgenic plants expressing different enzyme combinations and showing distinct metaboli  ...[more]

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