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Methods Mol Biol. 2009;577:11-24. doi: 10.1007/978-1-60761-232-2_2.

Systematic cloning of an ORFeome using the Gateway system.

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Chemical Genetics Laboratory and Chemical Genomics Research Group, RIKEN Advanced Science Institute, Saitama, Japan.


With the completion of the genome projects, there are increasing demands on the experimental systems that enable to exploit the entire set of protein-coding open reading frames (ORFs), viz. ORFeome, en masse. Systematic proteomic studies based on cloned ORFeomes are called "reverse proteomics," and have been launched in many organisms in recent years. Cloning of an ORFeome is such an attractive way for comprehensive understanding of biological phenomena, but is a challenging and daunting task. However, recent advances in techniques for DNA cloning using site-specific recombination and for high-throughput experimental techniques have made it feasible to clone an ORFeome with the minimum of exertion. The Gateway system is one of such the approaches, employing the recombination reaction of the bacteriophage lambda. Combining traditional DNA manipulation methods with modern technique of the recombination-based cloning system, it is possible to clone an ORFeome of an organism on an individual level.

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