Polyamines found to be present in increased amounts in GMO NK603 corn include putrescineand cadaverine, which can produce various toxic effects. For example, they enhance the effects of histamine, thus heightening allergic reactions, and both have been implicated in the formation of carcinogenic substances called nitrosamines.
Overall, the findings of this study raise questions about industry and regulatory agency claims that NK603 is ‘substantially equivalent’ to its non-GMO counterpart and suggest that a more thorough evaluation of the safety of consuming products derived from this GMO corn on a long term basis should be undertaken.
Background to study
The establishment of compositional ‘substantial equivalence’ is a key starting point requested by regulatory agencies for assessing the safety of a GMO crop and food. If analysis for nutrients and known toxins shows that the composition of a GMO crop is found to be in a similar range to that present in a corresponding, genetically similar non-GMO variety (often the non-GMO parent), then it is deemed to be ‘substantially equivalent’ and to require little, if any, further safety testing, especially in the USA.
Genetically modified (GM) corn NK603, engineered to survive being sprayed with glyphosate-based weedkillers such as Roundup, was assessed as ‘substantially equivalent’ to its non-GM parent corn variety, based on a nutrient composition analysis of both crops. It was subsequently granted market approval.
However, the nutrient compositional analysis is relatively crude and may miss subtle yet important differences between the GMO and non-GMO food, which could have health consequences for the consumer. For example, the compositional analysis includes measurement of total protein content, yet this is less important than the profile of different types of proteins. This detail is currently lacking in regulatory analysis investigating the substantial equivalence of a product.
This gap in compositional information for the Roundup-tolerant NK603 corn was addressed in this study by analysing this GMO with the nearest non-GMO corn variety as a control. The two crops were grown under similar conditions, in the same location and season, spaced at a sufficient distance to avoid cross-contamination. One field of NK603 was sprayed once with Roundup, whilst another field of NK603 was not treated with Roundup. Samples were produced in two cultivation cycles over two growing seasons. Thus all precautions were taken to minimise environmental factors that could influence the composition of the crops. The result is a comparative analysis that specifically highlights the effect of the genetic modification (GM) transformation process.
Rats fed this GMO corn over 2 years presented signs of a higher incidence of liver and kidney damage (Séralini et al., Environmental Sciences Europe, 26:14) compared with controls.
Analytical methods used
Analytical methods collectively known as “omics” technologies can be used to obtain an in-depth, molecular composition profile of a biological system or substance. These technologies include transcriptomics (gene function profiling), proteomics (protein profiling) and metabolomics (small biochemical profiling). Unlike gross nutrient analysis, omics technologies provide highly detailed molecular composition and biological functional information with a very high degree of predictability of health or disease status.
In this study, Dr Antoniou and colleagues have undertaken proteomics and metabolomics analyses, comparing NK603 with its non-GMO counterpart in order to deepen the understanding of the effects of the GM transformation process used to generate this variety of GMO corn. In addition, NK603 cultivated either with or without being sprayed with Roundup was also investigated in order to determine the effects, if any, of this weedkiller on the biochemistry and hence composition of this GMO corn.
This broad range of analysis is designed to ascertain more deeply and precisely whether NK603 is truly ‘substantially equivalent’ to its corresponding non-GMO variety and whether this raises any health concerns.
Findings
- A total of 117 proteins and 91 small molecule biochemicals (metabolites) were found to be statistically significantly altered in NK603 corn by the GM transformation process.
- The GM transformation process was the major contributor to variation in the protein and metabolite profiles, rather than environmental factors such as the spraying of the Roundup weedkiller or the growing season.
- Alteration in the protein profile revealed by the proteomics analysis was reflective of an imbalance in energy utilisation and oxidative stress (damage to cells and tissues by reactive oxygen).
- Small molecule biochemical profile differences revealed by metabolomics mostly consisted of an increase in a class of compounds known as polyamines; the levels of potentially toxic putrescine and especially cadaverine were markedly increased in the GM NK603 corn.
Conclusions
GM NK603 corn and its corresponding non-GMO corn variety are not substantially equivalent.
The GM transformation process caused alterations in both protein and metabolite composition profiles in NK603 corn.
The non-substantial equivalence of NK603 corn with the corresponding non-GMO corn, and the increases in potential toxic compounds (polyamines; putrescine, cadaverine) in NK603 corn, indicate that a more thorough investigation of the safety of consuming products derived from this GMO food is warranted.
Relevance to health
The GM transformation process causes a general disturbance in the GMO plant. Whether the increased levels of cadaverine and putrescine found in the NK603 corn samples can account for the signs of potential negative health effects in rats fed on this corn needs to be further analysed in long-term feeding studies on laboratory animals, using methods that specifically and more accurately quantify the amounts of these polyamines and their effects.
State-of-the-art molecular profiling ‘omics’ methods could be used to deepen our understanding of the differences between GM plants and their non-GMO counterparts. This would enable scientists to improve the pre-commercial safety testing of GM plants by highlighting the presence of increased levels of known toxins (for example, certain polyamines found at increased levels in this study) or novel toxins and potentially allergenic substances.
The paper:
Mesnage R, Agapito-Tenfen S, Vilperte V, Renney G, Ward M, Séralini GE, Nodari N, Antoniou MN. An integrated multi-omics analysis of the NK603 Roundup-tolerant GM maize reveals metabolism disturbances caused by the transformation process. Scientific Reports, 2016; 6:37855.
*Communicating author: michael.antoniou@kcl.ac.uk
This research was supported by The Sustainable Food Alliance
