Abstract
The features of a mosaic pattern of the expression of the nptII selective gene, which provides plant resistance to kanamycin antibiotic, and the target gene of Serratia marcescens secretory endonuclease under control of the bidirectional MAS promoter of the mannopine synthase gene of Agrobacterium tumefaciens Ti plasmid in epiallelic lines of transgenic tobacco plants (Nu5 and Nu6) were studied. Both genes are part of a complex insertion represented by two full-size T-DNA copies and one truncated copy located between them in the reverse orientation. Transgenic tobacco lines contrastingly differ in the phenotypic expression of the nptII gene (low frequency of mosaics in the Nu5 line and high in Nu6). It was established that a decrease in the level of expression of the selective gene occurs when transgenic plants pass from hemi- to homozygous state, and it is most pronounced for the Nu6 epiallele. It was demonstrated that synthesis of aberrant sense and antisense transcripts in the region of a truncated T-DNA copy occurs in the transgenic lines. Namely these transcripts can act as triggers and trigger the inactivation of the selective nptII gene expression.
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REFERENCES
Hobbs, S.L.A., Kpodar, P., and DeLong, C.M.O., The effect of T-DNA copy number, position and methylation on reporter gene expression in tobacco transformants, Plant Mol. Biol., 1990, vol. 15, pp. 851—864.
Peach, C. and Velten, J., Transgene expression variability (position effect) of CAT and GUS reporter genes driven by linked divergent T-DNA promoters, Plant Mol. Biol., 1991, vol. 17, pp. 49—60.
Kim, S.I. and Veena Gelvin, S.B., Genome-wide analysis of Agrobacterium T-DNA integration sites in the Arabidopsis genome generated under non-selective conditions, Plant J., 2007, vol. 51, no. 5, pp. 779—791. https://doi.org/10.1111/j.1365-313X.2007.03183.x
Iglesias, V.A., Moscone, E.A., Papp, I., et al., Molecular and cytogenetic analyses of stably and unstably expressed transgene loci in tobacco, Plant Cell, 1997, vol. 9, pp. 1251—1264.
Domínguez, A., Fagoaga, C., Navarro, L., et al., Regeneration of transgenic citrus plants under non selective conditions results in high-frequency recovery of plants with silenced transgenes, Mol. Genet. Genomics, 2002, vol. 267, no. 4, pp. 544—556. https://doi.org/10.1007/s00438-002-0688-z
Neuhuber, F., Park, Y.D., Matzke, A.J., and Matzke, M.A., Susceptibility of transgene loci to homology-dependent gene silencing, Mol. Gen. Genet., 1994, vol. 244, pp. 230—241.
Loginova, D.B., Shumnyi, V.K., and Deineko, E.V., Features of T-DNA insert organization in transgenic tobacco-plants, line Nu21, Inf. Vestn. Vavilovskogo O-va Genet. Sel., 2010, vol. 14, no. 1, pp. 659—665.
Marenkova, T.V. and Deineko, E.V., Transcriptional gene silencing in plants, Russ. J. Genet. 2010, vol. 46, no. 5, pp. 511—520. https://doi.org/10.1134/S1022795410050017
Csorba, T., Pantaleo, V., and Burgyán, J., RNA silencing: an antiviral mechanism, Adv. Virus Res., 2009, vol. 75, pp. 35—71. https://doi.org/10.1016/S0065-3527(09)07502-2
Morino, K., Olsen, O., and Shimamoto, K., Silencing of an aleurone-specific gene in transgenic rice is caused by a rearranged transgene, Plant J., 1999, vol. 17, no. 3, pp. 275—285.
Yan, H., Chretien, R., Ye, J., and Rommens, C.M., New construct approaches for efficient gene silencing in plants, Plant Physiol., 2006, vol. 141, no. 4, pp. 1508—1518. https://doi.org/10.1104/pp.106.082271
Nicholson, S.J. and Srivastava, V., Transgene constructs lacking transcription termination signal induce efficient silencing of endogenous targets in Arabidopsis, Mol. Genet. Genomics, 2009, vol. 282, no. 3, pp. 319—328. https://doi.org/10.1007/s00438-009-0467-1
Čermák, V. and Fischer, L., Pervasive read-through transcription of T-DNAs is frequent in tobacco BY-2 cells and can effectively induce silencing, BMC Plant Biol., 2018, vol. 18, no. 1, p. 252. https://doi.org/10.1186/s12870-018-1482-3
Marenkova, T.V., Loginova, D.B., and Deineko, E.V., Mosaic patterns of transgene expression in plants, Russ. J. Genet., 2012, vol. 48, no. 3, pp. 249—260. https://doi.org/10.1134/S1022795412030088
Marenkova (Novoselia), T.V., Deineko, E.V., and Shumnyi, V.K., Mosaic expression pattern of the nptII gene in transgenic tobacco plants Nu21, Russ. J. Genet., 2007, vol. 43, no. 7, pp. 780—790.
Marenkova, T.V. and Deineko, E.V., Hybridological analysis of inheritance of mosaic nptII gene expression in transgenic tobacco plants, Russ. J. Genet., 2016, vol. 52, no. 6, pp. 557—564. https://doi.org/10.1134/S1022795416060089
Loginova, D.B., Men’shanov, P.N., and Deineko, E.V., Analysis of mosaic expression of the nptII gene in transgenic tobacco plant lines contrasting in mosaicism, Russ. J. Genet., 2012, vol. 48, no. 11, pp. 1097—1102. https://doi.org/10.1134/S1022795412110051
Marenkova, T.V., Sidorchuk, Y.V., Kusnetsov, V.V., et al., Effect of changes in genome ploidy on the mosaic character of nptII gene expression in epialleles of the transgenic tobacco line Nu21, Russ. J. Genet., 2020, vol. 56, no. 2, pp. 204—212. https://doi.org/10.1134/S1022795420020088
Bubner, B., Gase, K., and Baldwin, I.T., Two-fold differences are the detection limit for determining transgene copy numbers in plants by real-time PCR, BMC Biotechnol., 2004, vol. 4: 14. https://doi.org/10.1186/1472-6750-4-14
Glantz, S.A., Primer of Biostatistics, New York: McGraw—Hill, 1997, 4th ed.
Nocarova, E., Opatrny, Z., and Fischer, L., Successive silencing of tandem reporter genes in potato (Solanum tuberosum) over 5 years of vegetative propagation, Ann. Bot., 2010, vol. 106, no. 4, pp. 565—572. https://doi.org/10.1093/aob/mcq153
Vain, P., James, V.A., Worland, B., and Snape, J.W., Transgene behavior across two generations in a large random population of transgenic rice plants produced by particle bombardment, Theor. Appl. Genet., 2002, vol. 105, pp. 878—889.
Gong, Z., Morales-Ruiz, T., Ariza, R.R., et al., ROS1, a repressor of transcriptional gene silencing in Arabidopsis, encodes a DNA glycosylase/lyase, Cell, 2002, vol. 111, pp. 803—814. https://doi.org/10.1016/S0092-8674(02)01133-9
Sallaud, C., Meynard, D., van Boxtel, J., et al., Highly efficient production and characterization of T-DNA plants for rice (Oryza sativa L.) functional genomics, Theor. Appl. Genet., 2003, vol. 106, pp. 1396—1408. https://doi.org/10.1007/s00122-002-1184-x
De Wilde, C., Podevin, N., Windels, P., and Depicker, A., Silencing of antibody genes in plants with single-copy transgene inserts as a result of gene dosage effects, Mol. Genet. Genomics, 2001, vol. 265, pp. 647—653. https://doi.org/10.1007/s004380100458
Qin, H., Dong, Y., and von Arnim, A.G., Epigenetic interactions between Arabidopsis transgenes: characterization in light of transgene integration sites, Plant Mol. Biol., 2003, vol. 52, no. 1, pp. 217—231. https://doi.org/10.1023/a:1023941123149
Luo, Z. and Chen, Z., Improperly terminated, unpolyadenylated mRNA of sense transgenes is targeted by RDR6-mediated RNA silencing in Arabidopsis, Plant Cell, 2007, vol. 19, no. 3, pp. 943—958. https://doi.org/10.1105/tpc.106.045724
Lohuis, M., Muller, A., Heidmann, I., et al., A repetitive DNA fragment carrying a hot spot for de novo DNA methylation enhances expression variegation in tobacco and petunia, Plant J., 1995, vol. 8, pp. 919—932.
Eike, M.C., Mercy, I.S., and Aalen, R.B., Transgene silencing may be mediated by aberrant sense promoter sequence transcripts generated from cryptic promoters, Cell. Mol. Life Sci., 2005, vol. 62, pp. 3080—3091. https://doi.org/10.1007/s00018-005-5301-2
Permyakova, N.V., Shumnyi, V.K., and Deineko, E.V., Agrobacterium-mediated transformation of plants: transfer of vector DNA fragments in the plant genome, Russ. J. Genet., 2009, vol. 45, no. 3, pp. 266—275. https://doi.org/10.1134/S1022795409030028
Day, C.D., Transgene integration into the same chromosome location can produce alleles that express at a predictable level, or alleles that are differentially silenced, Genes Dev., 2000, vol. 14, no. 22, pp. 2869—2880. https://doi.org/10.1101/gad.849600
Robbins, M.L., Wang, P., Sekhon, R.S., and Chopra, S., Gene structure induced epigenetic modifications of pericarp color1 alleles of maize result in tissue specific mosaicism, PLoS One, 2009, vol. 4, no. 12, pp. 1—12. https://doi.org/10.1371/journal.pone.0008231
Morita, Y., Saito, R., Ban, Y., et al., Tandemly arranged chalcone synthase A genes contribute to the spatially regulated expression of siRNA and the natural bicolor floral phenotype in Petunia hybrida, Plant J., 2012, vol. 70, no. 5, pp. 739—749. https://doi.org/10.1111/j.1365-313X.2012.04908.x
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This work was supported by the budgetary project no. 0259-2021-0010 “Study of Systems Metabolic Control of Living Systems in Conditions of Interaction with the Environment, Including after Genetic Modification.”
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Marenkova, T.V., Kuznetsov, V.V. & Deineko, E.V. Features of Expression of Foreign Genes in Complex Insertions in Transgenic Tobacco Plants with a Mosaic Pattern of nptII Gene Expression. Russ J Genet 57, 319–328 (2021). https://doi.org/10.1134/S1022795421030108
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DOI: https://doi.org/10.1134/S1022795421030108