1
|
Wang D, Fei Y, Niu C, Lu S, Chen X, Wu Y, He P, Zhang X, Chen H, Wang H, Gao Y. Proficiency testing for event-specific quantification of genetically modified maize MON87427: Performance assessment based on the metrologically traceable reference values as assigned values. Food Chem 2024; 453:139668. [PMID: 38805943 DOI: 10.1016/j.foodchem.2024.139668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 04/08/2024] [Accepted: 05/12/2024] [Indexed: 05/30/2024]
Abstract
The Asia Pacific Metrology Program and the Accreditation Cooperation joint Proficiency Testing (PT) program for the quantification of genetically modified maize MON87427 was organized by the National Institute of Metrology, China, to enhance the measurement accuracy and metrological traceability in the region. Certified reference materials were employed as test samples; metrologically traceable certified reference values served as PT reference values (PTRVs) for evaluating the participants results. The consensus values obtained from the participants were higher than the assigned values, potentially due to the systematic effects of DNA extraction process. The participants' relatively poor overall performance by the ζ-score compared with z-score demonstrates their need to thoroughly investigate quantification bias to elevate the measurement capability of genetically modified (GM) content and deepen their understanding of uncertainty estimation. This program confirmed the importance of using metrologically traceable reference values instead of consensus values as PTRV for reliable performance assessment.
Collapse
Affiliation(s)
- Di Wang
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China
| | - Yue Fei
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China
| | - Chunyan Niu
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China
| | - Song Lu
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China
| | - Xian Chen
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China
| | - Yuhua Wu
- Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Ping He
- Specialized Standards Accreditation Department (SSAD), China National Accreditation Service for Conformity Assessment (CNAS), Beijing 100062, China
| | - Xiujie Zhang
- Development Center for Science and Technology, Ministry of Agriculture and Rural Affairs (MARA), Beijing 100176, China
| | - Hong Chen
- Development Center for Science and Technology, Ministry of Agriculture and Rural Affairs (MARA), Beijing 100176, China
| | - Haoqian Wang
- Development Center for Science and Technology, Ministry of Agriculture and Rural Affairs (MARA), Beijing 100176, China
| | - Yunhua Gao
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China.
| |
Collapse
|
2
|
Zhou E, Song N, Xiao Q, Farooq Z, Jia Z, Wen J, Dai C, Ma C, Tu J, Shen J, Fu T, Yi B. Construction of transgenic detection system of Brassica napus L. based on single nucleotide polymorphism chip. 3 Biotech 2022; 12:11. [PMID: 34966634 PMCID: PMC8655060 DOI: 10.1007/s13205-021-03062-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 11/09/2021] [Indexed: 01/03/2023] Open
Abstract
Brassica napus L. is a vital oil crop in China. As auxiliary tools for rapeseed breeding, transgenic technologies play a considerable role in heterosis, variety improvement, and pest resistance. Research on transgenic detection technologies is of great significance for the introduction, supervision, and development of transgenic rapeseed in China. However, the transgenic detection methods currently in use are complex and time-consuming, with low output. A single nucleotide polymorphism (SNP) chip can effectively overcome such limitations. In the present study, we collected 40 transgenic elements and designed 291 probes. The probe sequences were submitted to Illumina Company, and the Infinium chip technology was used to prepare SNP chips. In the present Brassica napus transgenic detection experiment, 84 high-quality probes of 17 transgenic elements were preliminarily screened, and genotyping effect was optimised for the probe signal value. Ultimately, a transgenic detection system for B. napus was developed. The developed system has the advantages of simple operation, minimal technical errors, and stable detection outcomes. A transgenic detection sensitivity test revealed that the probe designed could accurately detect 1% of transgenic samples and had high detection sensitivity. In addition, in repeatability tests, the CaMV35S promoter coefficient of variation was approximately 3.58%. Therefore, the SNP chip had suitable repeatability in transgene detection. The SNP chip developed could be used to construct transgenic detection systems for B. napus. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13205-021-03062-6.
Collapse
Affiliation(s)
- Enqiang Zhou
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Nuan Song
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Qing Xiao
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Zunaira Farooq
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Zhibo Jia
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Jing Wen
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Cheng Dai
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Chaozhi Ma
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Jinxing Tu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Jinxiong Shen
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Tingdong Fu
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| | - Bin Yi
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement, Huazhong Agricultural University, Wuhan, 430000 China
| |
Collapse
|
3
|
Li J, Li L, Zhang L, Zhang X, Li X, Zhai S, Gao H, Li Y, Wu G, Wu Y. Development of a certified genomic DNA reference material for detection and quantification of genetically modified rice KMD. Anal Bioanal Chem 2020; 412:7007-7016. [PMID: 32740822 DOI: 10.1007/s00216-020-02834-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/09/2020] [Accepted: 07/20/2020] [Indexed: 10/23/2022]
Abstract
Qualitative and quantitative detection of genetically modified products is inseparable from the application of reference materials (RMs). In this study, a batch of genomic DNA (gDNA) certified reference materials (CRMs) was developed using genetically modified rice Kemingdao (KMD) homozygotes as the raw material. The gDNA CRMs in this batch showed good homogeneity; the minimum sample intake was determined to be 2 μL. The stability study showed that transportation by cold chain is preferable, no significant degradation trend was observed during a 12-month period when storing the gDNA CRMs at 4 °C and - 20 °C, and the number of freeze-thaw cycles cannot exceed 10. The property values of the copy number ratio of transgene and endogenous gene and the copy number concentration for gDNA CRMs were determined by a collaborative characterization of eight laboratories using the duplex KMD/PLD droplet digital PCR (ddPCR) assays. The uncertainty components of characterization, potential between-unit heterogeneity, and potential degradation during long-term storage were combined to estimate the expanded uncertainty of the certified value with a coverage factor k of 2.0. The certified value of copy number ratio for KMD gDNA CRM is 0.99 ± 0.05, and that of copy number concentration is (1.76 ± 0.10) × 105 copies/μL. Compared to the gDNA CRMs in availability, this batch of KMD gDNA CRMs is assigned accurate property values and can be directly used for qualitative and quantitative detection of GMOs as well as evaluation of the parameters of analytical methods with no need of further DNA concentration measurement. Graphical abstract.
Collapse
Affiliation(s)
- Jun Li
- Key Laboratory of Biology and Genetic Improvement of Oil Crops of the Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062, Hubei, China
| | - Liang Li
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Li Zhang
- School of Life Science, South-Central University for Nationalities, Wuhan, 430074, Hubei, China
| | - Xiujie Zhang
- Development Center of Science and Technology, Ministry of Agriculture and Rural Affairs P. R. China, Beijing, 100025, China.
| | - Xiaying Li
- Development Center of Science and Technology, Ministry of Agriculture and Rural Affairs P. R. China, Beijing, 100025, China
| | - Shanshan Zhai
- Key Laboratory of Biology and Genetic Improvement of Oil Crops of the Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062, Hubei, China
| | - Hongfei Gao
- Key Laboratory of Biology and Genetic Improvement of Oil Crops of the Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062, Hubei, China
| | - Yunjing Li
- Key Laboratory of Biology and Genetic Improvement of Oil Crops of the Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062, Hubei, China
| | - Gang Wu
- Key Laboratory of Biology and Genetic Improvement of Oil Crops of the Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062, Hubei, China.
| | - Yuhua Wu
- Key Laboratory of Biology and Genetic Improvement of Oil Crops of the Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062, Hubei, China.
| |
Collapse
|
4
|
Wu Y, Li J, Li X, Zhai S, Gao H, Li Y, Zhang X, Wu G. Development and strategy of reference materials for the DNA-based detection of genetically modified organisms. Anal Bioanal Chem 2019; 411:1729-1744. [DOI: 10.1007/s00216-019-01576-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Revised: 12/21/2018] [Accepted: 01/03/2019] [Indexed: 12/11/2022]
|
5
|
Yang Y, Li L, Yang H, Li X, Zhang X, Xu J, Zhang D, Jin W, Yang L. Development of Certified Matrix-Based Reference Material as a Calibrator for Genetically Modified Rice G6H1 Analysis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:3708-3715. [PMID: 29584422 DOI: 10.1021/acs.jafc.8b00468] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The accurate monitoring and quantification of genetically modified organisms (GMOs) are key points for the implementation of labeling regulations, and a certified reference material (CRM) acts as the scaleplate for quantifying the GM contents of foods/feeds and evaluating a GMO analytical method or equipment. Herein we developed a series of CRMs for transgenic rice event G6H1, which possesses insect-resistant and herbicide-tolerant traits. Three G6H1 CRMs were produced by mixing seed powders obtained from homozygous G6H1 and its recipient cultivar Xiushui 110 at mass ratios of 49.825%, 9.967%, and 4.986%. The between-bottle homogeneity and within-bottle homogeneity were thoroughly evaluated with consistent results. The potential DNA degradation in transportation and shelf life were evaluated with an expiration period of at least 12 months. The property values of three CRMs (G6H1a, G6H1b, G6H1c) were given as (49.825 ± 0.448) g/kg, (9.967 ± 1.757) g/kg, and (4.986 ± 1.274 g/kg based on mass fraction ratio, respectively. Furthermore, the three CRMs were characterized with values of (5.01 ± 0.08)%, (1.06 ± 0.22)%, and (0.53 ± 0.11)% based on the copy number ratio using the droplet digital PCR method. All results confirmed that the produced G6H1 matrix-based CRMs are of high quality with precise characterization values and can be used as calibrators in GM rice G6H1 inspection and monitoring and in evaluating new analytical methods or devices targeting the G6H1 event.
Collapse
Affiliation(s)
- Yu Yang
- National Center for the Molecular Characterization of Genetically Modified Organisms, School of Life Sciences and Biotechnology , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Liang Li
- Biotechnology Research Institute , Chinese Academy of Agricultural Sciences , Beijing 100081 , China
| | - Hui Yang
- National Center for the Molecular Characterization of Genetically Modified Organisms, School of Life Sciences and Biotechnology , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Xiaying Li
- Development Center of Science and Technology , Ministry of Agriculture of People's Republic of China , Beijing 100025 , China
| | - Xiujie Zhang
- Development Center of Science and Technology , Ministry of Agriculture of People's Republic of China , Beijing 100025 , China
| | - Junfeng Xu
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Quality and Standard for Agro-Products , Zhejiang Academy of Agricultural Sciences , Hangzhou 310021 , China
| | - Dabing Zhang
- National Center for the Molecular Characterization of Genetically Modified Organisms, School of Life Sciences and Biotechnology , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Wujun Jin
- Biotechnology Research Institute , Chinese Academy of Agricultural Sciences , Beijing 100081 , China
| | - Litao Yang
- National Center for the Molecular Characterization of Genetically Modified Organisms, School of Life Sciences and Biotechnology , Shanghai Jiao Tong University , Shanghai 200240 , China
| |
Collapse
|
6
|
Félix-Urquídez D, Pérez-Urquiza M, Valdez Torres JB, León-Félix J, García-Estrada R, Acatzi-Silva A. Development, Optimization, and Evaluation of a Duplex Droplet Digital PCR Assay To Quantify the T-nos/hmg Copy Number Ratio in Genetically Modified Maize. Anal Chem 2015; 88:812-9. [PMID: 26605751 PMCID: PMC4718530 DOI: 10.1021/acs.analchem.5b03238] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Certified
reference materials (CRMs) are required to guarantee
the reliability of analytical measurements. The CRMs available in
the field of genetically modified organisms (GMOs) are characterized
using real-time polymerase chain reaction (qPCR). This technology
has limited application, because of its dependence on a calibrant.
The objective of this study was to obtain a method with higher metrological
quality, to characterize the CRMs for their contents of T-nos/hmg copy number ratio in maize. A duplex droplet
digital PCR (ddPCR) assay was developed and optimized by a central
composite design. The developed method achieved an absolute limit
of detection (LOD) of 11 cP T-nos, a relative LOD
of 0.034%, a limit of quantification (LOQ) of 23 cP (relative LOQ
of 0.08%), and a dynamic range of 0.08%–100% T-nos/hmg ratio. The specificity and applicability of
the assay were established for the analysis of low T-nos concentrations (0.9%) in several corn varieties. The convenience
of DNA digestion to reduce measurement bias in the case of multiple-copy
binding was confirmed through an enzymatic restriction assay. Given
its overall performance, this method can be used to characterize CRM
candidates for their contents of T-nos/hmg ratio.
Collapse
Affiliation(s)
- Dalmira Félix-Urquídez
- Research Center for Food and Development, Culiacán, Sinaloa México.,National Metrology Center, El Marqués, Querétaro México
| | | | | | | | | | - Abraham Acatzi-Silva
- Reference National Center for Detection of Genetically Modified Organisms, Tecámac, Estado de México México
| |
Collapse
|
7
|
Developing a matrix reference material for screening of transgenic rice. Anal Bioanal Chem 2015; 407:9153-63. [PMID: 26462921 DOI: 10.1007/s00216-015-9081-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 09/18/2015] [Accepted: 09/24/2015] [Indexed: 10/23/2022]
Abstract
Certified reference materials (CRMs) that are compatible with detection methods are needed to detect genetically modified organisms (GMOs). Screening is the first detection step in determining the possible presence of GMO ingredients in food or feed; however, screening has been hindered by the lack of GMO CRMs. In this study, transgenic rice materials were developed via the transformation of a construct harboring 11 commonly used screening elements. Digital PCR was utilized to identify a homozygous single-copy line termed SDrice. The qualitative detections of 11 elements in 21 transgenic materials demonstrated that the genomic DNA of the SDrice was suitable for use as a positive control in the screening of GMO ingredients. The suitability of SDrice as reference material was further checked by testing the sensitivity of 11 known conventional PCR assays, ranging from 10 to 50 copies of the SDrice genome. The standard curves that were created using SDrice DNA series as calibrators all exhibited good linearities in the relationships of the Ct values with the template copy numbers in these 11 real-time PCR assays. The LODs of the real-time PCR assays were estimated to be two to five copies of the SDrice genome. Comparisons of the SDrice with other GM rice revealed that significant differences existed in both the intercepts of the standard curves and the ΔCt values of the exogenous and reference genes for the P-35S, T-nos, HPT, T-35S, and Bar assays; the SDrice was not fit for quantification of other GM rice events. This study provided a matrix reference material (RM) that was suitable for screening GM rice, determination of sensitivity and a LOD of PCR assays, and overcame some of the drawbacks of plasmid DNA as reference material.
Collapse
|
8
|
Jiang Y, Yang H, Quan S, Liu Y, Shen P, Yang L. Development of certified matrix-based reference material of genetically modified rice event TT51-1 for real-time PCR quantification. Anal Bioanal Chem 2015; 407:6731-9. [DOI: 10.1007/s00216-015-8836-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 05/29/2015] [Accepted: 06/08/2015] [Indexed: 10/23/2022]
|
9
|
Al-Salameen F, Kumar V, Al-Aqeel H, Al-Hashash H, Hejji AB. Detection of genetically modified DNA in fresh and processed foods sold in Kuwait. GM CROPS & FOOD 2014; 3:283-8. [DOI: 10.4161/gmcr.21364] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
10
|
Trojanowicz M, Latoszek A, Poboży E. Analysis of Genetically Modified Food Using High-Performance Separation Methods. ANAL LETT 2010. [DOI: 10.1080/00032711003653841] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
11
|
Li X, Shen K, Yang L, Wang S, Pan L, Zhang D. Applicability of a novel reference molecule suitable for event-specific detections of maize NK603 based on both 5′ and 3′ flanking sequences. Food Control 2010. [DOI: 10.1016/j.foodcont.2009.12.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
12
|
Quantitation using informative zeros (QUIZ): Application for GMO detection and quantification without recourse to certified reference material. Food Chem 2010. [DOI: 10.1016/j.foodchem.2008.05.118] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
13
|
Towards future reference systems for GM analysis. Anal Bioanal Chem 2009; 396:1969-75. [DOI: 10.1007/s00216-009-3321-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Revised: 11/12/2009] [Accepted: 11/15/2009] [Indexed: 10/20/2022]
|
14
|
Rodríguez-Nogales J, Cifuentes A, García M, Marina M. Estimation of the percentage of transgenic Bt maize in maize flour mixtures using perfusion and monolithic reversed-phase high-performance liquid chromatography and chemometric tools. Food Chem 2008; 111:483-9. [DOI: 10.1016/j.foodchem.2008.03.079] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2007] [Revised: 02/22/2008] [Accepted: 03/30/2008] [Indexed: 10/22/2022]
|
15
|
Žel J, Mazzara M, Savini C, Cordeil S, Camloh M, Štebih D, Cankar K, Gruden K, Morisset D, Van den Eede G. Method Validation and Quality Management in the Flexible Scope of Accreditation: An Example of Laboratories Testing for Genetically Modified Organisms. FOOD ANAL METHOD 2008. [DOI: 10.1007/s12161-008-9016-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
16
|
|
17
|
|
18
|
Broothaerts W, Corbisier P, Emons H, Emteborg H, Linsinger TPJ, Trapmann S. Development of a certified reference material for genetically modified potato with altered starch composition. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:4728-34. [PMID: 17508757 DOI: 10.1021/jf0701584] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The presence of genetically modified organisms (GMOs) in food and feed products is subject to regulation in the European Union (EU) and elsewhere. As part of the EU authorization procedure for GMOs intended for food and feed use, reference materials must be produced for the quality control of measurements to quantify the GMOs. Certified reference materials (CRMs) are available for a range of herbicide- and insect-resistant genetically modified crops such as corn, soybean, and cotton. Here the development of the first CRM for a GMO that differs from its non-GMO counterpart in a major compositional constituent, that is, starch, is described. It is shown that the modification of the starch composition of potato (Solanum tuberosum L.) tubers, together with other characteristics of the delivered materials, have important consequences for the certification strategy. Moreover, the processing and characterization of the EH92-527-1 potato material required both new and modified procedures, different from those used routinely for CRMs produced from genetically modified seeds.
Collapse
Affiliation(s)
- Wim Broothaerts
- European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Retieseweg 111, 2440 Geel, Belgium.
| | | | | | | | | | | |
Collapse
|
19
|
Charels D, Broeders S, Corbisier P, Trapmann S, Schimmel H, Linsinger T, Emons H. Toward metrological traceability for DNA fragment ratios in GM quantification. 2. Systematic study of parameters influencing the quantitative determination of MON 810 corn by real-time PCR. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:3258-67. [PMID: 17407306 DOI: 10.1021/jf062932d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
This paper is part of a set of three papers investigating metrological traceability of the quantification of DNA fragments as, for instance, used for quantification of genetic modifications. This paper evaluates the possible impact of several factors on results of real-time Polymerase Chain Reaction (PCR) measurements. It was found that the particle size of the powder samples does not have an influence, whereas the nature of the calibrant (plasmidic or genomic DNA) has a significant effect. Moreover, two real-time PCR detection methods (construct-specific and event-specific) for MON 810 corn were compared. The results obtained in a specifically designed interlaboratory study revealed a significant influence of the DNA extraction method on measurement results when the MON 810 construct-specific real-time PCR detection method was applied. Statistical analyses confirmed the importance of validating DNA extraction methods in conjunction with real-time PCR methods.
Collapse
Affiliation(s)
- Diana Charels
- European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Retieseweg 111, 2440 Geel, Belgium.
| | | | | | | | | | | | | |
Collapse
|
20
|
Burns M, Valdivia H. A procedural approach for the identification of sources of uncertainty associated with GM quantification and real-time quantitative PCR measurements. Eur Food Res Technol 2006. [DOI: 10.1007/s00217-006-0502-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
21
|
|
22
|
Roda A, Mirasoli M, Guardigli M, Michelini E, Simoni P, Magliulo M. Development and validation of a sensitive and fast chemiluminescent enzyme immunoassay for the detection of genetically modified maize. Anal Bioanal Chem 2006; 384:1269-75. [PMID: 16491341 DOI: 10.1007/s00216-006-0308-6] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2005] [Revised: 12/29/2005] [Accepted: 01/07/2006] [Indexed: 11/26/2022]
Abstract
Proteins from the Cry 1 family, in particular Cry 1Ab, are commonly expressed in genetically modified Bt maize in order to control chewing insect pests. A sensitive chemiluminescent sandwich enzyme immunoassay for the detection of Cry1Ab protein from genetically modified Bt maize has been developed and validated. A Cry1Ab protein-specific antibody was immobilized on 96- or 384-well microtiter plates in order to capture the Cry1Ab toxin in the sample; the bound toxin was then detected by employing a second anti-Cry1Ab antibody and a horseradish peroxidase-labeled anti-antibody, followed by measurement of the enzyme activity with an enhanced chemiluminescent system. The chemiluminescent assay fulfilled all the requirements of accuracy and precision and exhibited limits of detection of a few pg mL(-1) Cry1Ab (3 or 5 pg mL(-1), depending on the assay format), which are significantly lower than that achievable using conventional colorimetric detection of peroxidase activity and also represent an improvement compared to previously developed Cry1Ab immunoassays. High-throughput analysis can be performed using the 384-well microtiter plate format immunoassay, which also allows one to reduce the consumption of samples and reagents. Validation of the assay, performed by analyzing certified reference materials, proved that the immunoassay is able to detect the presence of the Cry1Ab protein in certified reference samples containing as low as 0.1% of MON 810 genetically modified Bt maize. This value is below the threshold requiring mandatory labeling of foods containing genetically modified material according to the actual EU regulation.
Collapse
Affiliation(s)
- A Roda
- Department of Pharmaceutical Sciences, University of Bologna, Via Belmeloro 6, 40126, Bologna, Italy.
| | | | | | | | | | | |
Collapse
|