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Detection of mPing mobilization in transgenic rice plants

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Abstract

Background

Various kinds of transposable elements (TEs) constitute high proportions of eukaryotic genomes. Although most of these TEs are not actively mobile, genome stress can induce mobilization of dormant TEs. Transgenic plants undergo tissue culture and subsequent whole-plant regeneration, which can cause genomic stress and in turn induce mobilization of inactive TEs.

Objectives

To investigate the activation of transposable elements on the genome wide of the GM plant.

Methods

Transposon activities were analyzed in three transgenic rice plants carrying the insect resistance gene Cry1Ac and an herbicide resistance gene by the transposon display technique. These three transgenic plants were derived from a leading Korean rice variety, Illmi.

Results

We detected seven mobile activities in the mPing element, which is a MITE family transposon. The identity of the novel fragments in the gel display was confirmed by checking TAA target site duplication via sequence analysis. The genomic integration sites were all on different chromosomes, and the integrations were specific to either one or two T1 transgenic lines, except for one common integration on chromosome 4. One integration was in the 5′-UTR of the Glycerol-3-phosphate acyltransferase 8 gene, two integrations were in introns of expressed genes, and the other four integrations were in intergenic regions.

Conclusion

Thus, novel mobilization of dormant TEs occurs in transgenic plants, which must be considered in the generation of genetically modified crops (GM crops).

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Acknowledgements

This work was supported by the Next-Generation BioGreen21 Program (PJ01131301), Rural Development Administration of the Korean government.

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Contributions

IYC designed and oversaw the project. NSK wrote the manuscript. DP was a contributor to experiments and drafted the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Ik-Young Choi or Nam-Soo Kim.

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The authors declare that they have no competing of interests.

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This study does not contain any performing with human and animals.

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Park, D., Choi, IY. & Kim, NS. Detection of mPing mobilization in transgenic rice plants. Genes Genom 42, 47–54 (2020). https://doi.org/10.1007/s13258-019-00877-9

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