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Wayne LL, Gachotte DJ, Graupner PR, Adelfinskaya Y, McCaskill DG, Metz JG, Zirkle R, Walsh TA. Plant and algal lysophosphatidic acid acyltransferases increase docosahexaenoic acid accumulation at the sn-2 position of triacylglycerol in transgenic Arabidopsis seed oil. PLoS One 2021; 16:e0256625. [PMID: 34432852 PMCID: PMC8386867 DOI: 10.1371/journal.pone.0256625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 08/10/2021] [Indexed: 11/21/2022] Open
Abstract
Although docosahexaenoic acid (DHA), an important dietary omega-3 polyunsaturated fatty acid (PUFA), is at present primarily sourced from marine fish, bioengineered crops producing DHA may offer a more sustainable and cost-effective source. DHA has been produced in transgenic oilseed crops, however, DHA in seed oil primarily occupies the sn-1/3 positions of triacylglycerol (TAG) with relatively low amounts of DHA in the sn-2 position. To increase the amount of DHA in the sn-2 position of TAG and in seed oil, putative lysophosphatidic acid acyltransferases (LPAATs) were identified and characterized from the DHA-producing alga Schizochytrium sp. and from soybean (Glycine max). The affinity-purified proteins were confirmed to have LPAAT activity. Expression of the Schizochytrium or soybean LPAATs in DHA-producing Arabidopsis expressing the Schizochytrium PUFA synthase system significantly increased the total amount of DHA in seed oil. A novel sensitive band-selective heteronuclear single quantum coherence (HSQC) NMR method was developed to quantify DHA at the sn-2 position of glycerolipids. More than two-fold increases in sn-2 DHA were observed for Arabidopsis lines expressing Schizochytrium or soybean LPAATs, with one Schizochytrium LPAAT driving DHA accumulation in the sn-2 position to 61% of the total DHA. Furthermore, expression of a soybean LPAAT led to a redistribution of DHA-containing TAG species, with two new TAG species identified. Our results demonstrate that transgenic expression of Schizochytrium or soybean LPAATs can increase the proportion of DHA at the sn-2 position of TAG and the total amount of DHA in the seed oil of a DHA-accumulating oilseed plant. Additionally, the band-selective HSQC NMR method that we developed provides a sensitive and robust method for determining the regiochemistry of DHA in glycerolipids. These findings will benefit the advancement of sustainable sources of DHA via transgenic crops such as canola and soybean.
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Affiliation(s)
- Laura L. Wayne
- Corteva Agriscience, Johnston, Iowa, United States of America
- * E-mail:
| | | | - Paul R. Graupner
- Corteva Agriscience, Indianapolis, Indiana, United States of America
| | | | | | - James G. Metz
- DSM Nutritional Products, Columbia, Maryland, United States of America
| | - Ross Zirkle
- DSM Nutritional Products, Columbia, Maryland, United States of America
| | - Terence A. Walsh
- Corteva Agriscience, Indianapolis, Indiana, United States of America
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Rapid simulated gastric fluid digestion of in-seed/grain proteins expressed in genetically engineered crops. Regul Toxicol Pharmacol 2016; 81:106-112. [DOI: 10.1016/j.yrtph.2016.08.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 08/02/2016] [Accepted: 08/03/2016] [Indexed: 01/26/2023]
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Pinto CEM, Farias DF, Carvalho AFU, Oliveira JTA, Pereira ML, Grangeiro TB, Freire JEC, Viana DA, Vasconcelos IM. Food safety assessment of an antifungal protein from Moringa oleifera seeds in an agricultural biotechnology perspective. Food Chem Toxicol 2015; 83:1-9. [PMID: 26032632 DOI: 10.1016/j.fct.2015.05.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 05/15/2015] [Accepted: 05/21/2015] [Indexed: 10/23/2022]
Abstract
Mo-CBP3 is an antifungal protein produced by Moringa oleifera which has been investigated as potential candidate for developing transgenic crops. Before the use of novel proteins, food safety tests must be conducted. This work represents an early food safety assessment of Mo-CBP3, using the two-tiered approach proposed by ILSI. The history of safe use, mode of action and results for amino acid sequence homology using the full-length and short contiguous amino acids sequences indicate low risk associated to this protein. Mo-CBP3 isoforms presented a reasonable number of alignments (>35% identity) with allergens in a window of 80 amino acids. This protein was resistant to pepsin degradation up to 2 h, but it was susceptible to digestion using pancreatin. Many positive attributes were presented for Mo-CBP3. However, this protein showed high sequence homology with allergens and resistance to pepsin digestion that indicates that further hypothesis-based testing on its potential allergenicity must be done. Additionally, animal toxicity evaluations (e.g. acute and repeated dose oral exposure assays) must be performed to meet the mandatory requirements of several regulatory agencies. Finally, the approach adopted here exemplified the importance of performing an early risk assessment of candidate proteins for use in plant transformation programs.
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Affiliation(s)
- Clidia E M Pinto
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil
| | - Davi F Farias
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil.
| | - Ana F U Carvalho
- Department of Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil
| | - José T A Oliveira
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil
| | - Mirella L Pereira
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil
| | - Thalles B Grangeiro
- Department of Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil
| | - José E C Freire
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil
| | - Daniel A Viana
- State University of Ceará, Campus do Itaperi, 60740-903, Fortaleza, CE, Brazil
| | - Ilka M Vasconcelos
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Campus do Pici, 60440-900, Fortaleza, CE, Brazil.
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Bushey DF, Bannon GA, Delaney BF, Graser G, Hefford M, Jiang X, Lee TC, Madduri KM, Pariza M, Privalle LS, Ranjan R, Saab-Rincon G, Schafer BW, Thelen JJ, Zhang JX, Harper MS. Characteristics and safety assessment of intractable proteins in genetically modified crops. Regul Toxicol Pharmacol 2014; 69:154-70. [DOI: 10.1016/j.yrtph.2014.03.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 03/07/2014] [Accepted: 03/15/2014] [Indexed: 10/25/2022]
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Herman RA, Ekmay R. Do whole-food animal feeding studies have any value in the safety assessment of GM crops? Regul Toxicol Pharmacol 2013; 68:171-4. [PMID: 23851038 DOI: 10.1016/j.yrtph.2013.07.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 06/19/2013] [Accepted: 07/03/2013] [Indexed: 12/01/2022]
Abstract
The use of whole-food (grain meal contained in feed) animal-feeding studies to support the safety assessment of genetically modified crops has been contentious. This may be, in part, a consequence of poorly agreed upon study objectives. Whole-food animal-feeding studies have been postulated to be useful in detecting both expected and unexpected effects on the composition of genetically modified crops. While the justification of animal feeding studies to detect unexpected effects may be inadequately supported, there may be better justification to conduct such studies in specific cases to investigate the consequences of expected compositional effects including expression of transgenic proteins. Such studies may be justified when (1) safety cannot reasonably be predicted from other evidence, (2) reasonable hypothesis for adverse effects are postulated, (3) the compositional component in question cannot be isolated or enriched in an active form for inclusion in animal feeding studies, and (4) reasonable multiples of exposure can be accomplished relative to human diets. The study design for whole-food animal-feeding studies should be hypotheses-driven, and the types of data collected should be consistent with adverse effects that are known to occur from dietary components of biological origin.
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Affiliation(s)
- Rod A Herman
- Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN 46268, United States.
| | - Ricardo Ekmay
- Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN 46268, United States.
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