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Strategies for developing marker-free transgenic plants

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Abstract

The development of marker-free transgenic plants has responded to public concerns over the safety of biotechnology crops. It seems that continued work in this area will soon remove the question of unwanted marker genes from the debate concerning the public acceptability of transgenic crop plants. Selectable marker genes are co-introduced with genes of interest to identify those cells that have integrated the DNA into their genome. Despite the large number of different selection systems, marker genes that confer resistance to the antibiotics, hygromycin (hpt) and kanamycin (nptII) or herbicide phosphinothricin (bar), have been used in most transgenic research and crop development techniques. The techniques that remove marker gene are under development and will eventually facilitate more precise and subtle engineering of the plant genome, with widespread applications in both fundamental research and biotechnology. In addition to allaying public concerns, the absence of resistance genes in transgenic plants could reduce the costs of developing biotechnology crops and lessen the need for time-consuming safety evaluations, thereby speeding up the commercial production of biotechnology crops. Many research results and various techniques have been developed to produce marker-free transgenic plants. This review describes the strategies for eliminating selectable marker genes to generate marker-free transgenic plants, focusing on the three significant marker-free technologies, co-transformation, site-specific recombinase-mediated excision, and non-selected transformation.

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  1. Division of Biosafety, National Academy of Agricultural Science, Rural Development Administration, Suwon, 441-707, Korea

    Hee-Jong Woo & Seok-Cheol Suh

  2. Department of Crop Science, Chungbuk National University, Cheongju, 361-763, Korea

    Yong-Gu Cho

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Woo, HJ., Suh, SC. & Cho, YG. Strategies for developing marker-free transgenic plants. Biotechnol Bioproc E 16, 1053–1064 (2011). https://doi.org/10.1007/s12257-011-0519-3

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