101
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Ismail RM. Evaluation of genetically modified sugarcane lines carrying Cry 1AC gene using molecular marker techniques. GM CROPS & FOOD 2013; 4:58-66. [PMID: 23549345 DOI: 10.4161/gmcr.24299] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Five genetically modified insect resistant sugarcane lines harboring the Bt Cry 1AC gene to produce insecticidal proteins were compared with non-transgenic control by using three types of molecular marker techniques namely, RAPD, ISSR and AFLP. These techniques were applied on transgenic and non-transgenic plants to investigate the genetic variations, which may appear in sugarcane clones. This variation might demonstrate the genomic changes associated with the transformation process, which could change important molecular basis of various biological phenomena. Genetic variations were screened using 22 different RAPD primers, 10 ISSR primers and 13 AFLP primer combinations. Analysis of RAPD and ISSR banding patterns gave no exclusive evidence for genetic variations. Meanwhile, the percentage of polymorphic bands was 0.45% in each of RAPD and ISSR, while the polymorphism generated by AFLP analysis was 1.8%. The maximum percentage of polymorphic bands was 1.4%, 1.1% and 5.5% in RAPD, ISSR and AFLP, respectively. These results demonstrate that most transgenic lines showed genomic homogeneity and verified minor genomic changes. Dendrograms revealing the relationships among the transgenic and control plants were developed from the data of each of the three marker types.
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Affiliation(s)
- Roba M Ismail
- Department of Plant Genetic Transformation, Agricultural Genetic Engineering Research Institute (AGERI), Agricultural Research Center (ARC), Giza, Egypt.
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102
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Balmer D, Flors V, Glauser G, Mauch-Mani B. Metabolomics of cereals under biotic stress: current knowledge and techniques. FRONTIERS IN PLANT SCIENCE 2013; 4:82. [PMID: 23630531 PMCID: PMC3632780 DOI: 10.3389/fpls.2013.00082] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Accepted: 03/20/2013] [Indexed: 05/18/2023]
Abstract
Prone to attacks by pathogens and pests, plants employ intricate chemical defense mechanisms consisting of metabolic adaptations. However, many plant attackers are manipulating the host metabolism to counteract defense responses and to induce favorable nutritional conditions. Advances in analytical chemistry have allowed the generation of extensive metabolic profiles during plant-pathogen and pest interactions. Thereby, metabolic processes were found to be highly specific for given tissues, species, and plant-pathogen/pest interactions. The clusters of identified compounds not only serve as base in the quest of novel defense compounds, but also as markers for the characterization of the plants' defensive state. The latter is especially useful in agronomic applications where meaningful markers are essential for crop protection. Cereals such as maize make use of their metabolic arsenal during both local and systemic defense responses, and the chemical response is highly adapted to specific attackers. Here, we summarize highlights and recent findings of metabolic patterns of cereals under pathogen and pest attack.
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Affiliation(s)
- Dirk Balmer
- Institute of Biology, University of NeuchâtelNeuchâtel, Switzerland
- *Correspondence: Brigitte Mauch-Mani, University of Neuchâtel, Faculty of Sciences, Institute of Botany, Rue Emile Argand 11, 2000 Neuchâtel, Switzerland. e-mail:
| | - Victor Flors
- Metabolic Integration and Cell Signaling Group, Plant Physiology Section, Departamento de Ciencias Agrarias y del Medio Natural, Universitat Jaume ICastellón, Spain
| | - Gaetan Glauser
- Chemical Analytical Service of the Swiss Plant Science Web, University of NeuchâtelNeuchâtel, Switzerland
| | - Brigitte Mauch-Mani
- Institute of Biology, University of NeuchâtelNeuchâtel, Switzerland
- *Correspondence: Brigitte Mauch-Mani, University of Neuchâtel, Faculty of Sciences, Institute of Botany, Rue Emile Argand 11, 2000 Neuchâtel, Switzerland. e-mail:
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103
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Gong CY, Wang T. Proteomic evaluation of genetically modified crops: current status and challenges. FRONTIERS IN PLANT SCIENCE 2013; 4:41. [PMID: 23471542 PMCID: PMC3590489 DOI: 10.3389/fpls.2013.00041] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 02/19/2013] [Indexed: 05/07/2023]
Abstract
Hectares of genetically modified (GM) crops have increased exponentially since 1996, when such crops began to be commercialized. GM biotechnology, together with conventional breeding, has become the main approach to improving agronomic traits of crops. However, people are concerned about the safety of GM crops, especially GM-derived food and feed. Many efforts have been made to evaluate the unintended effects caused by the introduction of exogenous genes. "Omics" techniques have advantages over targeted analysis in evaluating such crops because of their use of high-throughput screening. Proteins are key players in gene function and are directly involved in metabolism and cellular development or have roles as toxins, antinutrients, or allergens, which are essential for human health. Thus, proteomics can be expected to become one of the most useful tools in safety assessment. This review assesses the potential of proteomics in evaluating various GM crops. We further describe the challenges in ensuring homogeneity and sensitivity in detection techniques.
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Affiliation(s)
| | - Tai Wang
- *Correspondence: Tai Wang, Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Haidianqu, Beijing 100093, China. e-mail:
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104
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Mehrotra S, Goyal V. Evaluation of designer crops for biosafety--a scientist's perspective. Gene 2012; 515:241-8. [PMID: 23266812 DOI: 10.1016/j.gene.2012.12.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 10/26/2012] [Accepted: 12/04/2012] [Indexed: 01/16/2023]
Abstract
With the advent of transgenic technology, it has become possible to mobilize and express foreign genes into plants and to design crop varieties with better agronomic attributes and adaptability to challenging environmental conditions. Recent advances in transgenic technology have led to concerns about safety of transgenic crops to human and animal health and environment. Biosafety focuses on preventing, minimizing and eliminating risks associated with the research, production, and use of transgenic crops. Food biosafety involves studies of substantial equivalence related to compositional analysis, toxicity and allergenicity. Environmental biosafety involves glasshouse and field trials and study of unintended effects on non-target organisms. Transgenics are characterized at phenotypic and molecular levels for understanding the location of transgene insertion site, ploidy level, copy number, integrated vector sequences, protein expression and stability of the transgene. Various techniques employed for transgene characterization include flow cytometry, southern, northern and western analyses, real-time (qRT) PCR, competitive PCR, FISH, fiber-FISH, DNA micro-arrays, mRNA profiling, 2DE-MS, iTRAQ, FT-MS, NMR, GC-MS, CE-MS and biosensor-based approaches. Evaluation of transgene expression involves the application of integrated phenomics, transcriptomics, proteomics and metabolomics approaches. However, the relevance and application of these approaches may vary in different cases. The elaborate analysis of transgenic crops will facilitate the safety assessment and commercialization of transgenics and lead to global food security for the future.
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Affiliation(s)
- Shweta Mehrotra
- National Research Centre on Plant Biotechnology, Lal Bahadur Shastri Building, Pusa Campus, New Delhi-110012, India.
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105
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Ricroch AE. Assessment of GE food safety using '-omics' techniques and long-term animal feeding studies. N Biotechnol 2012; 30:349-54. [PMID: 23253614 DOI: 10.1016/j.nbt.2012.12.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2012] [Revised: 11/29/2012] [Accepted: 12/03/2012] [Indexed: 12/28/2022]
Abstract
Despite the fact that a thorough, lengthy and costly evaluation of genetically engineered (GE) crop plants (including compositional analysis and toxicological tests) is imposed before marketing some European citizens remain sceptical of the safety of GE food and feed. In this context, are additional tests necessary? If so, what can we learn from them? To address these questions, we examined data from 60 recent high-throughput '-omics' comparisons between GE and non-GE crop lines and 17 recent long-term animal feeding studies (longer than the classical 90-day subchronic toxicological tests), as well as 16 multigenerational studies on animals. The '-omics' comparisons revealed that the genetic modification has less impact on plant gene expression and composition than that of conventional plant breeding. Moreover, environmental factors (such as field location, sampling time, or agricultural practices) have a greater impact than transgenesis. None of these '-omics' profiling studies has raised new safety concerns about GE varieties; neither did the long-term and multigenerational studies on animals. Therefore, there is no need to perform such long-term studies in a case-by-case approach, unless reasonable doubt still exists after conducting a 90-day feeding test. In addition, plant compositional analysis and '-omics' profiling do not indicate that toxicological tests should be mandatory. We discuss what complementary fundamental studies should be performed and how to choose the most efficient experimental design to assess risks associated with new GE traits. The possible need to update the current regulatory framework is discussed.
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Affiliation(s)
- Agnès E Ricroch
- AgroParisTech, Chair of Evolutionary Genetics and Plant Breeding, 16, rue Claude-Bernard, 75005 Paris, France.
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106
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Robertson FP, Koistinen PK, Gerrish C, Halket JM, Patel RK, Fraser PD, Bramley PM. Proteome changes in tomato lines transformed with phytoene synthase-1 in the sense and antisense orientations. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:6035-43. [PMID: 22987837 PMCID: PMC3467302 DOI: 10.1093/jxb/ers252] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/17/2012] [Indexed: 05/18/2023]
Abstract
The commercial cultivation of genetically engineered (GE) crops in Europe has met with considerable consumer resistance, which has led to vigorous safety assessments including the measurement of substantial equivalence between the GE and parent lines. This necessitates the identification and quantification of significant changes to the metabolome and proteome in the GE crop. In this study, the quantitative proteomic analysis of tomato fruit from lines that have been transformed with the carotenogenic gene phytoene synthase-1 (Psy-1), in the sense and antisense orientations, in comparison with a non-transformed, parental line is described. Multidimensional protein identification technology (MudPIT), with tandem mass spectrometry, has been used to identify proteins, while quantification has been carried out with isobaric tags for relative and absolute quantification (iTRAQ). Fruit from the GE plants showed significant alterations to their proteomes compared with the parental line, especially those from the Psy-1 sense transformants. These results demonstrate that MudPIT and iTRAQ are suitable techniques for the verification of substantial equivalence of the proteome in GE crops.
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Affiliation(s)
- Francesca P. Robertson
- Present address: Department of Nutrition and Metabolism, Faculty
of Health and Medical Sciences, University of Surrey, Guildford
GU2 7XH, UK
| | - P. Kaisa Koistinen
- Present address: Department of Biosciences, University of
Kuopio, PO Box 1627, FI-70211 Kuopio,
Finland
| | - Christopher Gerrish
- School of Biological Sciences, Royal Holloway, University of
London, Egham, Surrey TW20 0EX,
UK
| | - John M. Halket
- Present address: Specialist Bioanalytical Services
Ltd, Egham, Surrey TW20 9LZ,
UK
| | - Raj K.P. Patel
- School of Biological Sciences, Royal Holloway, University of
London, Egham, Surrey TW20 0EX,
UK
| | - Paul D. Fraser
- School of Biological Sciences, Royal Holloway, University of
London, Egham, Surrey TW20 0EX,
UK
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107
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Chandler SF, Sanchez C. Genetic modification; the development of transgenic ornamental plant varieties. PLANT BIOTECHNOLOGY JOURNAL 2012; 10:891-903. [PMID: 22537268 DOI: 10.1111/j.1467-7652.2012.00693.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Plant transformation technology (hereafter abbreviated to GM, or genetic modification) has been used to develop many varieties of crop plants, but only a few varieties of ornamental plants. This disparity in the rate and extent of commercialisation, which has been noted for more than a decade, is not because there are no useful traits that can be engineered into ornamentals, is not due to market potential and is not due to a lack of research and development activity. The GM ornamental varieties which have been released commercially have been accepted in the marketplace. In this article, progress in the development of transgenic ornamentals is reviewed and traits useful to both consumers and producers are identified. In considering possible factors limiting the release of genetically modified ornamental products it is concluded that the most significant barrier to market is the difficulty of managing, and the high cost of obtaining, regulatory approval.
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108
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Beckles DM, Tananuwong K, Shoemaker CF. Starch characteristics of transgenic wheat (Triticum aestivum L.) overexpressing the Dx5 high molecular weight glutenin subunit are substantially equivalent to those in nonmodified wheat. J Food Sci 2012; 77:C437-42. [PMID: 22515236 DOI: 10.1111/j.1750-3841.2012.02648.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
UNLABELLED The effects of engineering higher levels of the High Molecular Weight Glutenin Dx5 subunit on starch characteristics in transgenic wheat (Triticum aestivum L.) grain were evaluated. This is important because of the interrelationship between starch and protein accumulation in grain, the strong biotechnological interest in modulating Dx5 levels and the increasing likelihood that transgenic wheat will be commercialized in the U.S. Unintended effects of Dx5 overexpression on starch could affect wheat marketability and therefore should be examined. Two controls with native levels of Dx5 were used: (i) the nontransformed Bobwhite cultivar, and (ii) a transgenic line (Bar-D) expressing a herbicide resistant (bar) gene, and they were compared with 2 transgenic lines (Dx5G and Dx5J) containing bar and additional copies of Dx5. There were few changes between Bar-D and Dx5G compared to Bobwhite. However, Dx5J, the line with the highest Dx5 protein (×3.5) accumulated 140% more hexose, 25% less starch and the starch had a higher frequency of longer amylopectin chains. These differences were not of sufficient magnitude to influence starch functionality, because granule morphology, crystallinity, amylose-to-amylopectin ratio, and the enthalpy of starch gelatinization and the amylose-lipid complex melting were similar to the control (P > 0.05). This overall similarity was borne out by Partial Least Squares-Discriminant Function Analysis, which could not distinguish among genotypes. Collectively our data imply that higher Dx5 can affect starch accumulation and some aspects of starch molecular structure but that the starches of the Dx5 transgenic wheat lines are substantially equivalent to the controls. PRACTICAL APPLICATION Transgenic manipulation of biochemical pathways is an effective way to enhance food sensory quality, but it can also lead to unintended effects. These spurious changes are a concern to Government Regulatory Agencies and to those Industries that market the product. In this study we examined if making "specific" changes to the composition of gluten proteins in wheat seeds would simultaneously alter starch, as their synthesis is interrelated and the molecular structure of both determine flour functionality. This information may be used to address issues of "substantial equivalence" and to inform Industrial End-Users of possible changes in product performance.
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Affiliation(s)
- Diane M Beckles
- Department of Plant Sciences, University of California, Davis, CA 95616, USA.
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109
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Raybould A, Higgins LS, Horak MJ, Layton RJ, Storer NP, De La Fuente JM, Herman RA. Assessing the ecological risks from the persistence and spread of feral populations of insect-resistant transgenic maize. Transgenic Res 2012; 21:655-64. [PMID: 22002083 PMCID: PMC3348485 DOI: 10.1007/s11248-011-9560-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Accepted: 09/15/2011] [Indexed: 11/29/2022]
Abstract
One source of potential harm from the cultivation of transgenic crops is their dispersal, persistence and spread in non-agricultural land. Ecological damage may result from such spread if the abundance of valued species is reduced. The ability of a plant to spread in non-agricultural habitats is called its invasiveness potential. The risks posed by the invasiveness potential of transgenic crops are assessed by comparing in agronomic field trials the phenotypes of the crops with the phenotypes of genetically similar non-transgenic crops known to have low invasiveness potential. If the transgenic and non-transgenic crops are similar in traits believed to control invasiveness potential, it may be concluded that the transgenic crop has low invasiveness potential and poses negligible ecological risk via persistence and spread in non-agricultural habitats. If the phenotype of the transgenic crop is outside the range of the non-transgenic comparators for the traits controlling invasiveness potential, or if the comparative approach is regarded as inadequate for reasons of risk perception or risk communication, experiments that simulate the dispersal of the crop into non-agricultural habitats may be necessary. We describe such an experiment for several commercial insect-resistant transgenic maize events in conditions similar to those found in maize-growing regions of Mexico. As expected from comparative risk assessments, the transgenic maize was found to behave similarly to non-transgenic maize and to be non-invasive. The value of this experiment in assessing and communicating the negligible ecological risk posed by the low invasiveness potential of insect-resistant transgenic maize in Mexico is discussed.
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Affiliation(s)
- Alan Raybould
- Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK.
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110
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Gong CY, Li Q, Yu HT, Wang Z, Wang T. Proteomics insight into the biological safety of transgenic modification of rice as compared with conventional genetic breeding and spontaneous genotypic variation. J Proteome Res 2012; 11:3019-29. [PMID: 22509807 DOI: 10.1021/pr300148w] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The potential of unintended effects caused by transgenic events is a key issue in the commercialization of genetically modified (GM) crops. To investigate whether transgenic events cause unintended effects, we used comparative proteomics approaches to evaluate proteome differences in seeds from 2 sets of GM indica rice, herbicide-resistant Bar68-1 carrying bar and insect-resistant 2036-1a carrying cry1Ac/sck, and their respective controls D68 and MH86, as well as indica variety MH63, a parental line for breeding MH86, and japonica variety ZH10. This experimental design allowed for comparing proteome difference caused by transgenes, conventional genetic breeding, and natural genetic variation. Proteomics analysis revealed the maximum numbers of differentially expressed proteins between indica and japonica cultivars, second among indica varieties with relative small difference between MH86 and MH63, and the minimum between GM rice and respective control, thus indicating GM events do not substantially alter proteome profiles as compared with conventional genetic breeding and natural genetic variation. Mass spectrometry analysis revealed 234 proteins differentially expressed in the 6 materials, and these proteins were involved in different cellular and metabolic processes with a prominent skew toward metabolism (31.2%), protein synthesis and destination (25.2%), and defense response (22.4%). In these seed proteomes, proteins implicated in the 3 prominent biological processes showed significantly different composite expression patterns and were major factors differentiating japonica and indica cultivars, as well as indica varieties. Thus, metabolism, protein synthesis and destination, and defense response in seeds are important in differentiating rice cultivars and varieties.
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Affiliation(s)
- Chun Yan Gong
- Key Laboratory for Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences and National Center for Plant Gene Research, Beijing 100093, China
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111
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Chan Z, Bigelow PJ, Loescher W, Grumet R. Comparison of salt stress resistance genes in transgenic Arabidopsis thaliana indicates that extent of transcriptomic change may not predict secondary phenotypic or fitness effects. PLANT BIOTECHNOLOGY JOURNAL 2012; 10:284-300. [PMID: 22070784 DOI: 10.1111/j.1467-7652.2011.00661.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Engineered abiotic stress resistance is an important target for increasing agricultural productivity. There are concerns, however, regarding possible ecological impacts of transgenic crops. In contrast to the first wave of transgenic crops, many abiotic stress resistance genes can initiate complex downstream changes. Transcriptome profiling has been suggested as a comprehensive non-targeted approach to examine the secondary effects. We compared phenotypic and transcriptomic effects of constitutive expression of genes intended to confer salt stress tolerance by three different mechanisms: a transcription factor, CBF3/DREB1a; a metabolic gene, M6PR, for mannitol biosynthesis; and the Na⁺/H⁺ antiporter, SOS1. Transgenic CBF3, M6PR and SOS1 Arabidopsis thaliana were grown together in the growth chamber, greenhouse and field. In the absence of salt, M6PR and SOS1 lines performed comparably with wild type; CBF3 lines exhibited dwarfing as reported previously. All three transgenes conferred fitness advantage when subjected to 100 mm NaCl in the growth chamber. CBF3 and M6PR affected transcription of numerous abiotic stress-related genes as measured by Affymetrix microarray analysis. M6PR additionally modified expression of biotic stress and oxidative stress genes. Transcriptional effects of SOS1 in the absence of salt were smaller and primarily limited to redox-related genes. The extent of transcriptome change, however, did not correlate with the effects on growth and reproduction. Thus, the magnitude of global transcriptome differences may not predict phenotypic differences upon which environment and selection act to influence fitness. These observations have implications for interpretation of transcriptome analyses in the context of risk assessment and emphasize the importance of evaluation within a phenotypic context.
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Affiliation(s)
- Zhulong Chan
- Plant Breeding, Genetics and Biotechnology Program and Department of Horticulture, Plant and Soil Sciences Building, Michigan State University, East Lansing MI, USA
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112
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Frank T, Röhlig RM, Davies HV, Barros E, Engel KH. Metabolite profiling of maize kernels--genetic modification versus environmental influence. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:3005-12. [PMID: 22375597 DOI: 10.1021/jf204167t] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A metabolite profiling approach based on gas chromatography-mass spectrometry (GC-MS) was applied to investigate the metabolite profiles of genetically modified (GM) Bt-maize (DKC78-15B, TXP 138F) and Roundup Ready-maize (DKC78-35R). For the comparative investigation of the impact of genetic modification versus environmental influence on the metabolite profiles, GM maize was grown together with the non-GM near-isogenic comparators under different environmental conditions, including several growing locations and seasons in Germany and South Africa. Analyses of variance (ANOVA) revealed significant differences between GM and non-GM maize grown in Germany and South Africa. For the factor genotype, 4 and 3%, respectively, of the total number of peaks detected by GC-MS showed statistically significant differences (p < 0.01) in peak heights as compared to the respective isogenic lines. However, ANOVA for the factor environment (growing location, season) revealed higher numbers of significant differences (p < 0.01) between the GM and the non-GM maize grown in Germany (42%) and South Africa (10%), respectively. This indicates that the majority of differences observed are related to natural variability rather than to the genetic modifications. In addition, multivariate data assessment by means of principal component analysis revealed that environmental factors, that is, growing locations and seasons, were dominant parameters driving the variability of the maize metabolite profiles.
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Affiliation(s)
- Thomas Frank
- Technische Universität München, Lehrstuhl für Allgemeine Lebensmitteltechnologie, D-85350 Freising-Weihenstephan, Germany
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113
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Giddings LV, Potrykus I, Ammann K, Fedoroff NV. Confronting the Gordian knot. Nat Biotechnol 2012; 30:208-9. [DOI: 10.1038/nbt.2145] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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114
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Snell C, Bernheim A, Bergé JB, Kuntz M, Pascal G, Paris A, Ricroch AE. Assessment of the health impact of GM plant diets in long-term and multigenerational animal feeding trials: A literature review. Food Chem Toxicol 2012; 50:1134-48. [PMID: 22155268 DOI: 10.1016/j.fct.2011.11.048] [Citation(s) in RCA: 110] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 11/23/2011] [Accepted: 11/24/2011] [Indexed: 10/14/2022]
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115
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Szwacka M, Burza W, Zawirska-Wojtasiak R, Gośliński M, Twardowska A, Gajc-Wolska J, Kosieradzka I, Kiełkiewicz M. Genetically Modified Crops Expressing 35S-Thaumatin II Transgene: Sensory Properties and Food Safety Aspects. Compr Rev Food Sci Food Saf 2012. [DOI: 10.1111/j.1541-4337.2011.00178.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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116
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Okazaki Y, Saito K. Recent advances of metabolomics in plant biotechnology. PLANT BIOTECHNOLOGY REPORTS 2012; 6:1-15. [PMID: 22308170 PMCID: PMC3262138 DOI: 10.1007/s11816-011-0191-2] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 07/05/2011] [Indexed: 05/18/2023]
Abstract
Biotechnology, including genetic modification, is a very important approach to regulate the production of particular metabolites in plants to improve their adaptation to environmental stress, to improve food quality, and to increase crop yield. Unfortunately, these approaches do not necessarily lead to the expected results due to the highly complex mechanisms underlying metabolic regulation in plants. In this context, metabolomics plays a key role in plant molecular biotechnology, where plant cells are modified by the expression of engineered genes, because we can obtain information on the metabolic status of cells via a snapshot of their metabolome. Although metabolome analysis could be used to evaluate the effect of foreign genes and understand the metabolic state of cells, there is no single analytical method for metabolomics because of the wide range of chemicals synthesized in plants. Here, we describe the basic analytical advancements in plant metabolomics and bioinformatics and the application of metabolomics to the biological study of plants.
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Affiliation(s)
- Yozo Okazaki
- RIKEN Plant Science Center, Tsurumi-ku, Yokohama, 230-0045 Japan
| | - Kazuki Saito
- RIKEN Plant Science Center, Tsurumi-ku, Yokohama, 230-0045 Japan
- Graduate School of Pharmaceutical Sciences, Chiba University, Inage-ku, Chiba, 263-8522 Japan
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117
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Balsamo GM, Cangahuala-Inocente GC, Bertoldo JB, Terenzi H, Arisi ACM. Proteomic analysis of four Brazilian MON810 maize varieties and their four non-genetically-modified isogenic varieties. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:11553-9. [PMID: 21958074 DOI: 10.1021/jf202635r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Profiling techniques have been suggested as a nontargeted approach to detect unintended effects in genetically modified (GM) plants. Seedlings from eight Brazilian maize varieties, four MON810 GM varieties and four non-GM isogenic varieties, were grown under controlled environmental conditions. Physiological parameters (aerial part weight, main leaf length, and chlorophyll and total protein contents) were compared, and some differences were observed. Nevertheless, these differences were not constant among all GM and non-GM counterparts. Leaf proteomic profiles were analyzed using two-dimensional gel electrophoresis (2DE) coupled to mass spectrometry, using six 2DE gels per variety. The comparison between MON810 and its counterpart was limited to qualitative differences of fully reproducible protein spot patterns. Twelve exclusive proteins were observed in two of four maize variety pairs; all of these leaf proteins were variety specific. In this study, MON810 leaf proteomes of four varieties were similar to non-GM counterpart leaf proteomes.
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Affiliation(s)
- Geisi M Balsamo
- Departamento de Ciência e Tecnologia de Alimentos, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rod. Admar Gonzaga 1346, 88034-001 Florianópolis-SC, Brazil
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118
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Bally J, Job C, Belghazi M, Job D. Metabolic adaptation in transplastomic plants massively accumulating recombinant proteins. PLoS One 2011; 6:e25289. [PMID: 21966485 PMCID: PMC3178635 DOI: 10.1371/journal.pone.0025289] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2011] [Accepted: 08/31/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Recombinant chloroplasts are endowed with an astonishing capacity to accumulate foreign proteins. However, knowledge about the impact on resident proteins of such high levels of recombinant protein accumulation is lacking. METHODOLOGY/PRINCIPAL FINDINGS Here we used proteomics to characterize tobacco (Nicotiana tabacum) plastid transformants massively accumulating a p-hydroxyphenyl pyruvate dioxygenase (HPPD) or a green fluorescent protein (GFP). While under the conditions used no obvious modifications in plant phenotype could be observed, these proteins accumulated to even higher levels than ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco), the most abundant protein on the planet. This accumulation occurred at the expense of a limited number of leaf proteins including Rubisco. In particular, enzymes involved in CO(2) metabolism such as nuclear-encoded plastidial Calvin cycle enzymes and mitochondrial glycine decarboxylase were found to adjust their accumulation level to these novel physiological conditions. CONCLUSIONS/SIGNIFICANCE The results document how protein synthetic capacity is limited in plant cells. They may provide new avenues to evaluate possible bottlenecks in recombinant protein technology and to maintain plant fitness in future studies aiming at producing recombinant proteins of interest through chloroplast transformation.
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Affiliation(s)
- Julia Bally
- Centre National de la Recherche Scientifique - Bayer CropScience Joint Laboratory, UMR5240, Lyon, France
| | - Claudette Job
- Centre National de la Recherche Scientifique - Bayer CropScience Joint Laboratory, UMR5240, Lyon, France
| | - Maya Belghazi
- Centre d'Analyse Protéomique de Marseille, Institut Fédératif de Recherche Jean Roche, Marseille, France
| | - Dominique Job
- Centre National de la Recherche Scientifique - Bayer CropScience Joint Laboratory, UMR5240, Lyon, France
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119
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Herman RA, Ladics GS. Endogenous allergen upregulation: transgenic vs. traditionally bred crops. Food Chem Toxicol 2011; 49:2667-9. [PMID: 21784119 DOI: 10.1016/j.fct.2011.07.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 07/05/2011] [Accepted: 07/07/2011] [Indexed: 11/26/2022]
Abstract
The safety assessment for transgenic food crops currently includes an evaluation of the endogenous allergy potential (via serum IgE screening) when the non-transgenic counterpart is a commonly allergenic food. The value of this analysis in the safety assessment of transgenic crops, especially with reference to recent requests to quantify individual allergen concentrations in raw commodities, is examined. We conclude that the likelihood of upregulating an endogenous allergen due to transgenesis is no greater than from traditional breeding which has a history of safety and is largely unregulated. The potential consequences of upregulating an endogenous allergen are also unclear.
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Affiliation(s)
- Rod A Herman
- Dow AgroSciences LLC, 9330 Zionsville Rd., Indianapolis, IN 46268, USA.
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120
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Modern Biotechnology—Potential Contribution and Challenges for Sustainable Food Production in Sub-Saharan Africa. SUSTAINABILITY 2011. [DOI: 10.3390/su3060809] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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121
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Huesing J, Romeis J, Ellstrand N, Raybould A, Hellmich R, Wolt J, Ehlers J, Dabiré C, Fatokun C, Hokanson K, Ishiyaku MF, Margam V, Obokoh N, Mignouna J, Nangayo F, Ouedraogo J, Pasquet R, Pittendrigh B, Schaal B, Stein J, Tamò M, Murdock L. Regulatory considerations surrounding the deployment of Bt-expressing cowpea in Africa: report of the deliberations of an expert panel. ACTA ACUST UNITED AC 2011; 2:211-24. [PMID: 22179194 DOI: 10.4161/gmcr.2.3.18689] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Cowpea (Vigna unguiculata spp unguiculata) is adapted to the drier agro-ecological zones of West Africa where it is a major source of dietary protein and widely used as a fodder crop. Improving the productivity of cowpea can enhance food availability and security in West Africa. Insect predation--predominately from the legume pod borer (Maruca vitrata), flower thrips (Megalurothrips sjostedti) and a complex of pod-sucking bugs (e.g., Clavigralla spp)--is a major yield-limiting factor in West African cowpea production. Dramatic increases in yield are shown when M. vitrata is controlled with insecticides. However, availability, costs, and safety considerations limit pesticides as a viable option for boosting cowpea production. Development of Bt-cowpea through genetic modification (GM) to control the legume pod borer is a promising approach to cowpea improvement. Cowpea expressing the lepidopteran-active Cry1Ab protein from Bacillus thuringiensis is being developed as a first generation Bt-cowpea crop for West Africa. Appropriate stewardship of Bt-cowpea to assure its sustainability under West African conditions is critical to its successful development. A first step in this process is an environmental risk assessment to determine the likelihood and magnitude of adverse effects of the Cry1Ab protein on key environmental protection goals in West Africa. Here we describe the results of an expert panel convened in 2009 to develop the problem formulation phase for Bt-cowpea and to address specific issues around gene flow, non-target arthropods, and insect resistance management.
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Affiliation(s)
- Joseph Huesing
- Department of Entomology; Purdue University; West Lafayette, IN, USA.
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