101
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Djukanovic V, Orczyk W, Gao H, Sun X, Garrett N, Zhen S, Gordon-Kamm W, Barton J, Lyznik LA. Gene conversion in transgenic maize plants expressing FLP/FRT and Cre/loxP site-specific recombination systems. PLANT BIOTECHNOLOGY JOURNAL 2006; 4:345-57. [PMID: 17147640 DOI: 10.1111/j.1467-7652.2006.00186.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
DNA recombination reactions (site-specific and homologous) were monitored in the progeny of transgenic maize plants by bringing together two recombination substrates (docking sites and shuttle vectors) in the zygotes. In one combination of transgenic events, the recombination marker gene (yellow fluorescent protein gene, YFP) was activated in 1%-2% of the zygotes receiving both substrates. In other crosses, chimeric embryos and plants were identified, indicative of late recombination events taking place after the first mitotic division of the zygotes. The docking site structure remained unchanged; therefore, all recovered recombination events were classified as gene conversions. The recombinant YFP-r gene segregated as a single locus in subsequent generations. The recombination products showed evidence of homologous recombination at the 5' end of the YFP marker gene and recombinational rearrangements at the other end, consistent with the conclusion that DNA replication was involved in generation of the recombination products. Here, we demonstrate that maize zygotes are efficient at generating homologous recombination products and that the homologous recombination pathways may successfully compete with other possible DNA repair/recombination mechanisms such as site-specific recombination. These results indicate that maize zygotes provide a permissive environment for homologous recombination, offering a new strategy for gene targeting in maize.
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Affiliation(s)
- Vesna Djukanovic
- Pioneer Hi-Bred International, A DuPont Business, Research Center, 7300 NW 62nd Avenue, Johnston, IA 50131-1004, USA
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102
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Sidorov V, Gilbertson L, Addae P, Duncan D. Agrobacterium-mediated transformation of seedling-derived maize callus. PLANT CELL REPORTS 2006; 25:320-8. [PMID: 16252091 DOI: 10.1007/s00299-005-0058-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2005] [Revised: 07/07/2005] [Accepted: 08/25/2005] [Indexed: 05/05/2023]
Abstract
Efficient production of seedling-derived Type I callus was demonstrated for several corn genotypes including commercial inbred lines. Seeds were germinated on MS-based medium containing 10 mg l(-1) picloram and 3 mg l(-1) 6-benzylaminopurine, which induced the development of axillary buds in the area of coleoptilar node. Nodal sections of 7-10-day old seedlings were isolated, split longitudinally, and placed on callus induction medium supplemented with 2.2 mg l(-1) picloram and 0.5 mg l(-1) 2,4-dichlorophenoxyacetic acid. For lines L4 and L9 the frequency of embryogenic callus induction was 38-42% based on calli per split nodal section. Frequency of callus induction from split nodal sections of seeds germinated on media without growth regulators was 0-3%. Seedling-derived callus of five genotypes was used for Agrobacterium-mediated transformation. Two constructs containing the green fluorescence protein gene and genes for either neomycin phosphotransferase II or glyphosate selection were used in transformation experiments. Transformation frequency varied from 2 to 11% and about 60% of the T(0) plants had 1-2 copies of transgenes.
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Affiliation(s)
- Vladimir Sidorov
- Monsanto Company, 700 Chesterfield Parkway North, St. Louis, MO 63017, USA.
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103
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Kerbach S, Lörz H, Becker D. Site-specific recombination in Zea mays. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2005; 111:1608-16. [PMID: 16200415 DOI: 10.1007/s00122-005-0092-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Accepted: 08/22/2005] [Indexed: 05/04/2023]
Abstract
The elimination of marker genes after selection is recommended for the commercial use of genetically modified plants. We compared the applicability of the two site-specific recombination systems Cre/lox and Flp/FRT for marker gene elimination in maize plants. The selection marker gene pat surrounded by two identically directed lox or FRT sites was introduced into maize. Sexual crossing with plants harboring the corresponding constitutively expressed recombinase led to the precise and complete excision of the lox-flanked marker gene in the F1 progeny, whereas Flp-mediated recombination of FRT sequences occurred rarely. Further examination of site-specific integration was done by biolistic bombardment of immature embryos harboring only one lox site with a lox.uidA sequence with results indicating directed integration.
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Affiliation(s)
- S Kerbach
- Biocenter Klein Flottbek, Section Developmental Biology and Biotechnology, University of Hamburg, Ohnhorststrasse 18, 22609, Hamburg, Germany
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104
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Goldstein DA, Tinland B, Gilbertson LA, Staub JM, Bannon GA, Goodman RE, McCoy RL, Silvanovich A. Human safety and genetically modified plants: a review of antibiotic resistance markers and future transformation selection technologies. J Appl Microbiol 2005; 99:7-23. [PMID: 15960661 DOI: 10.1111/j.1365-2672.2005.02595.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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105
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Kopertekh L, Schiemann J. Agroinfiltration as a tool for transient expression of cre recombinase in vivo. Transgenic Res 2005; 14:793-8. [PMID: 16245170 DOI: 10.1007/s11248-005-8293-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/27/2005] [Indexed: 12/01/2022]
Abstract
Agroinfiltration was used to express transiently cre recombinase from bacteriophage P1 in planta. Activation of gfp expression after cre-mediated excision of a bar intervening sequence served as a marker to monitor site-specific recombination events in lox-target N. benthamiana plants. Gfp expressing regenerants from A. tumefaciens infiltrated leaves were obtained with an efficiency of about 34%. In 20% of the regenerants bar gene excision was due to the expression of stably integrated cre gene, whereas in 14% of plants site-specific recombination was a consequence of transient cre expression. Phenotypic and molecular data indicated that the recombined state has been transferred to the T(1 )generation. These results demonstrate the suitability of agroinfiltration for the expression of cre recombinase in vivo.
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Affiliation(s)
- Lilya Kopertekh
- Federal Biological Research Centre for Agriculture and Forestry, Institute for Plant Virology, Microbiology and Biosafety, Messeweg 11-12, D-38104 Braunschweig, Germany
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106
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Ream TS, Strobel J, Roller B, Auger DL, Kato A, Halbrook C, Peters EM, Theuri J, Bauer MJ, Addae P, Dioh W, Staub JM, Gilbertson LA, Birchler JA. A test for ectopic exchange catalyzed by Cre recombinase in maize. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2005; 111:378-85. [PMID: 15912343 DOI: 10.1007/s00122-005-2031-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2004] [Accepted: 04/06/2005] [Indexed: 05/02/2023]
Abstract
A maize line expressing Cre recombinase as well as the recipient line without the transgene were assayed for evidence of ectopic recombination within the maize genome. Such a test is valuable for understanding the action of Cre as well as for its use to recombine two target lox sites present in the chromosomes. Pollen examination and seed set tests of material expressing Cre provided no evidence of ectopic recombination, which would be manifested in the production of translocations or inversions and result in pollen abortion and reduced seed set. Root-tip chromosome karyotype analysis was also performed on material with and without Cre expression. Chromosomal aberrations in Cre+ material were not observed above the background level.
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Affiliation(s)
- Thomas S Ream
- Division of Biological Sciences, University of Missouri-Columbia, Columbia, 65211, USA
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107
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Abstract
For nearly 15 years, the use of site-specific recombination systems in plants has focused on the deletion or integration of DNA. Each of these applications offers practical solutions to two problems in biotechnology: the presence of unneeded DNA in the transgene locus and variation in the locus structure among independent transgenic lines. Given that each of these separate applications is becoming more practical for commercial use, it is time to consider combining them into an integrated technology. Here we propose a strategy for a "combined step" method that makes use of two site-specific recombination systems: one for integrating the DNA and a second for removing sequences that are not needed after DNA transfer. This strategy is based on published data and exemplifies the use of the Cre-lox, FLP-FRT and R-RS inducible systems.
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Affiliation(s)
- Vibha Srivastava
- Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701, USA.
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108
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Radhakrishnan P, Srivastava V. Utility of the FLP-FRT recombination system for genetic manipulation of rice. PLANT CELL REPORTS 2005; 23:721-726. [PMID: 15480685 DOI: 10.1007/s00299-004-0876-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2004] [Revised: 07/12/2004] [Accepted: 08/16/2004] [Indexed: 05/24/2023]
Abstract
To develop an FLP-FRT recombination system- (derived from 2 mu plasmid of Saccharomyces cerevisiae) based marker gene removal application for rice, we introduced the gene for FLP recombinase, under the control of the maize ubiquitin-1 promoter, into the rice genome. FLP activity was monitored in callus and regenerated plants by an assay based on the deletion of the FRT-flanked DNA fragment, leading to the activation of the beta-glucuronidase gene. FLP activity was detected both in the callus and leaves of some of the transgenic lines. Based on our comparison of the recombination efficiency of the FLP-FRT system expressed in the transgenic lines with that of the widely used Cre-lox system (derived from bacteriophage P1), we suggest that the FLP-FRT system is a useful tool for the genetic manipulation of rice.
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Affiliation(s)
- Parthiban Radhakrishnan
- Department of Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR, 72701, USA.
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109
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Affiliation(s)
- Larry Gilbertson
- Monsanto Company, 700 Chesterfield Parkway North, Chesterfield, MO 63017-1732, USA.
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110
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Pistón F, Dorado G, Martín A, Barro F. Cloning and characterization of a gamma-3 hordein mRNA (cDNA) from Hordeum chilense (Roem. et Schult.). TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2004; 108:1359-1365. [PMID: 14747917 DOI: 10.1007/s00122-003-1548-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2003] [Accepted: 11/14/2003] [Indexed: 05/24/2023]
Abstract
Hordeum chilense is a wild relative of H. vulgare, cultivated barley, that has been successfully used in the synthesis of amphiploids by crossing with Triticum spp. These amphiploids-named generically x Tritordeum-have been tested under field conditions, and one of them, the hexaploid tritordeum obtained following chromosome doubling of the hybrid H. chilense x T. turgidum, shows traits of interest inherited from the barley parent. Of great interest is the allelic variation observed in the endosperm storage proteins and their influence on the breadmaking and malting quality of tritordeum. We report here two mRNA (cDNA) sequences for a gamma-3 hordein from two accession lines of H. chilense, H1 and H7, and their characterization by quantitative real time (QRT)-PCR in the developing endosperm. Sequences were obtained by rapid amplification of cDNA ends and "edge-to-edge" amplification of open reading frames from cDNA of H. chilense. Eight putative single nucleotide polymorphisms and one codon insertion were identified in the sequences of the H1 and H7 gamma-3 hordeins. The deduced amino acid sequences showed similar features to that of the gamma-3 hordein and gamma-gliadins from barley and wheat, respectively. While the repetitive motif (PQQQPF) is similar to that of the gamma-3 hordein from H. vulgare, there are 19 motif repeats in H. vulgare, whereas H. chilense shows 15 tandem repeats. The transcription of the genes encoding for the gamma-3 hordein were monitored by QRT-PCR: in both lines maximum transcription occurred 12 days after flowering.
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Affiliation(s)
- F Pistón
- Instituto de Agricultura Sostenible, CSIC, Apdo. 4084, 14080 Córdoba, Spain
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111
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Zhang W, Gianibelli MC, Rampling LR, Gale KR. Characterisation and marker development for low molecular weight glutenin genes from Glu-A3 alleles of bread wheat (Triticum aestivum. L). TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2004; 108:1409-19. [PMID: 14727031 DOI: 10.1007/s00122-003-1558-8] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2003] [Accepted: 11/24/2003] [Indexed: 05/22/2023]
Abstract
PCR was used to amplify low-molecular-weight (LMW) glutenin genes from the Glu-A3 loci of hexaploid wheat cultivars containing different Glu-A3 alleles. The complete coding sequence of one LMW glutenin gene was obtained for each of the seven alleles Glu-A3a to Glu-A3g. Chromosome assignment of PCR products using Chinese Spring nulli-tetrasomic lines confirmed the amplified products were from chromosome 1A. All sequences were classified as LMW-i-type genes based on the presence of an N-terminal isoleucine residue and eight cysteine residues located within the C-terminal domain of the predicted, mature amino acid sequence. All genes contained a single uninterrupted open reading frame, including the sequence from the Glu-A3e allele, for which no protein product has been identified. Comparison of LMW glutenin gene sequences obtained from different alleles showed a wide range of sequence identity between the genes, with between 1 and 37 single nucleotide polymorphisms and between one and five insertion/deletion events between genes from different alleles. Allele-specific PCR markers were designed based on the DNA polymorphisms identified between the LMW glutenin genes, and these markers were validated against a panel of cultivars containing different Glu-A3 alleles. This collection of markers represents a valuable resource for use in marker-assisted breeding to select for specific alleles of this important quality-determining locus in bread wheat.
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Affiliation(s)
- W Zhang
- Commonwealth Scientific and Industrial Research Organisation, Plant Industry, GPO Box 1600, ACT 2601 Canberra, Australia
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112
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Doganlar S, Frary A, Daunay MC, Lester RN, Tanksley SD. Conservation of gene function in the solanaceae as revealed by comparative mapping of domestication traits in eggplant. Genetics 2002. [PMID: 12196413 DOI: 10.1007/s10681-014-1234-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023] Open
Abstract
Quantitative trait loci (QTL) for domestication-related traits were identified in an interspecific F(2) population of eggplant (Solanum linnaeanum x S. melongena). Although 62 quantitative trait loci (QTL) were identified in two locations, most of the dramatic phenotypic differences in fruit weight, shape, color, and plant prickliness that distinguish cultivated eggplant from its wild relative could be attributed to six loci with major effects. Comparison of the genomic locations of the eggplant fruit weight, fruit shape, and color QTL with the positions of similar loci in tomato, potato, and pepper revealed that 40% of the different loci have putative orthologous counterparts in at least one of these other crop species. Overall, the results suggest that domestication of the Solanaceae has been driven by mutations in a very limited number of target loci with major phenotypic effects, that selection pressures were exerted on the same loci despite the crops' independent domestications on different continents, and that the morphological diversity of these four crops can be explained by divergent mutations at these loci.
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Affiliation(s)
- Sami Doganlar
- Department of Plant Breeding and Department of Plant Biology, Cornell University, Ithaca, New York 14853, USA
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