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Published on August 31, 2007; 10.1104/pp.107.106062

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Received July 24, 2007
Accepted August 22, 2007

pSAT RNAi Vectors: A Modular Series for Multiple Gene Downregulation in Plants

Mery Dafny-Yelin , Sang-Min Chung , Ellen L. Frankman , and Tzvi Tzfira *

Department of Molecular, Cellular and Developmental Biology, The University of Michigan, Ann Arbor, MI 48109; Department of Life Sciences, Dongguk University, Seoul 100-715, Republic of Korea; Westhampton Beach High School, 340 Mill Road, Westhampton Beach, NY 11978

* Corresponding author; email: ttzfira{at}umich.edu.

RNA interference (RNAi) is a powerful tool for functional gene analysis which has been successfully used to downregulate the levels of specific target genes, enabling loss-of-function studies in living cells. Hairpin (hp) RNA expression cassettes are typically constructed on binary plasmids and delivered into plant cells by Agrobacterium-mediated genetic transformation. Realizing the importance of RNAi for basic plant research, various vectors have been developed for RNAi-mediated gene silencing allowing the silencing of single target genes in plant cells. To further expand the collection of available tools for functional genomics in plant species, we constructed a set of modular vectors suitable for hpRNA expression under various constitutive promoters. Our system allows simple cloning of the target gene sequences into two distinct multi-cloning sites and its modular design provides a straightforward route for replacement of the expression cassette's regulatory elements. More importantly, our system was designed to facilitate the assembly of several hpRNA expression cassettes on a single plasmid, thereby enabling the simultaneous suppression of several target genes from a single vector. We tested the functionality of our new vector system by silencing overexpressed marker genes (GFP, DsRed2 and NPTII) in transgenic plants. Various combinations of hpRNA expression cassettes were assembled in binary plasmids; all showed strong downregulation of the reporter genes in transgenic plants. Furthermore, assembly of all three hpRNA expression cassettes, combined with a fourth cassette for the expression of a selectable marker, resulted in downregulation of all three different marker genes in transgenic plants. This vector system provides an important addition to the plant molecular biologist's toolbox which will significantly facilitate the use of RNAi technology for analyses of multiple gene function in plant cells.




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M. Dafny-Yelin and T. Tzfira
Delivery of Multiple Transgenes to Plant Cells
Plant Physiology, December 1, 2007; 145(4): 1118 - 1128.
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