Genetic engineering

Genetic engineering, also called genetic modification, is the direct manipulation of an organism's genome using biotechnology. It is a set of technologies used to change the genetic makeup of cells, including the transfer of genes within and across species boundaries to produce improved or novel organisms. New DNA is obtained by either isolating and copying the genetic material of interest using molecular cloning methods or by artificially synthesizing the DNA. A construct is usually created and used to insert this DNA into the host organism. As well as inserting genes, the process can be used to remove, or "knock out", genes. The new DNA can be inserted randomly, or targeted to a specific part of the genome.

An organism that is generated through genetic engineering is considered to be genetically modified (GM) and the resulting entity is a genetically modified organism (GMO). The first GMOs were bacteria generated in 1973 and the first GM animals were mice in 1974. Insulin-producing bacteria were commercialized in 1982 and genetically modified food has been sold since 1994. GloFish, the first GMO designed as a pet, was sold in the United States in December 2003.[1]

Genetic engineering techniques have been applied in numerous fields including research, agriculture, industrial biotechnology, and medicine. Enzymes used in laundry detergent and medicines such as insulin and human growth hormone are now manufactured in GM cells, experimental GM cell lines and GM animals such as mice or zebrafish are being used for research purposes, and genetically modified crops have been commercialized.

IUPAC definition
Process of inserting new genetic information into existing cells in order to
modify a specific organism for the purpose of changing its characteristics. Note: Adapted from ref.[2][3]

Definition

Comparison of conventional plant breeding with transgenic and cisgenic genetic modification.

Genetic engineering is a process that alters the genetic make-up of an organism by either removing or introducing DNA. DNA can be introduced directly into the host organism or into a cell that is then fused or hybridized with the host.[4] This relies on recombinant nucleic acid techniques to form new combinations of heritable genetic material followed by the incorporation of that material either indirectly through a vector system or directly through micro-injection, macro-injection or micro-encapsulation.[5]

Genetic engineering does not normally include traditional animal and plant breeding, in vitro fertilisation, induction of polyploidy, mutagenesis and cell fusion techniques that do not use recombinant nucleic acids or a genetically modified organism in the process.[4] However, some broad definitions of genetic engineering include selective breeding.[5] Cloning and stem cell research, although not considered genetic engineering,[6] are closely related and genetic engineering can be used within them.[7] Synthetic biology is an emerging discipline that takes genetic engineering a step further by introducing artificially synthesised material into an organism.[8]

Plants, animals or micro organisms that have been changed through genetic engineering are termed genetically modified organisms or GMOs.[9] If genetic material from another species is added to the host, the resulting organism is called transgenic. If genetic material from the same species or a species that can naturally breed with the host is used the resulting organism is called cisgenic.[10] If genetic engineering is used to remove genetic material from the target organism the resulting organism is termed a knockout organism.[11] In Europe genetic modification is synonymous with genetic engineering while within the United States of America and Canada genetic modification can also be used to refer to more conventional breeding methods.[12][13][14]

History

Humans have altered the genomes of species for thousands of years through selective breeding, or artificial selection[15]:1[16]:1 as contrasted with natural selection, and more recently through mutagenesis. Genetic engineering as the direct manipulation of DNA by humans outside breeding and mutations has only existed since the 1970s. The term "genetic engineering" was first coined by Jack Williamson in his science fiction novel Dragon's Island, published in 1951[17] – one year before DNA's role in heredity was confirmed by Alfred Hershey and Martha Chase,[18] and two years before James Watson and Francis Crick showed that the DNA molecule has a double-helix structure – though the general concept of direct genetic manipulation was explored in rudimentary form in Stanley G. Weinbaum's 1936 science fiction story Proteus Island.[19][20]

In 1974 Rudolf Jaenisch created the first GM animal.

In 1972, Paul Berg created the first recombinant DNA molecules by combining DNA from the monkey virus SV40 with that of the lambda virus.[21] In 1973 Herbert Boyer and Stanley Cohen created the first transgenic organism by inserting antibiotic resistance genes into the plasmid of an E. coli bacterium.[22][23] A year later Rudolf Jaenisch created a transgenic mouse by introducing foreign DNA into its embryo, making it the world’s first transgenic animal.[24] These achievements led to concerns in the scientific community about potential risks from genetic engineering, which were first discussed in depth at the Asilomar Conference in 1975. One of the main recommendations from this meeting was that government oversight of recombinant DNA research should be established until the technology was deemed safe.[25][26]

In 1976 Genentech, the first genetic engineering company, was founded by Herbert Boyer and Robert Swanson and a year later the company produced a human protein (somatostatin) in E.coli. Genentech announced the production of genetically engineered human insulin in 1978.[27] In 1980, the U.S. Supreme Court in the Diamond v. Chakrabarty case ruled that genetically altered life could be patented.[28] The insulin produced by bacteria, branded humulin, was approved for release by the Food and Drug Administration in 1982.[29]

In 1983, a biotech company, Advanced Genetic Sciences (AGS) applied for U.S. government authorization to perform field tests with the ice-minus strain of P. syringae to protect crops from frost, but environmental groups and protestors delayed the field tests for four years with legal challenges.[30] In 1987, the ice-minus strain of P. syringae became the first genetically modified organism (GMO) to be released into the environment[31] when a strawberry field and a potato field in California were sprayed with it.[32] Both test fields were attacked by activist groups the night before the tests occurred: "The world's first trial site attracted the world's first field trasher".[31]

The first field trials of genetically engineered plants occurred in France and the USA in 1986, tobacco plants were engineered to be resistant to herbicides.[33] The People’s Republic of China was the first country to commercialize transgenic plants, introducing a virus-resistant tobacco in 1992.[34] In 1994 Calgene attained approval to commercially release the Flavr Savr tomato, a tomato engineered to have a longer shelf life.[35] In 1994, the European Union approved tobacco engineered to be resistant to the herbicide bromoxynil, making it the first genetically engineered crop commercialized in Europe.[36] In 1995, Bt Potato was approved safe by the Environmental Protection Agency, after having been approved by the FDA, making it the first pesticide producing crop to be approved in the USA.[37] In 2009 11 transgenic crops were grown commercially in 25 countries, the largest of which by area grown were the USA, Brazil, Argentina, India, Canada, China, Paraguay and South Africa.[38]

In 2010, scientists at the J. Craig Venter Institute created the first synthetic genome and inserted it into an empty bacterial cell. The resulting bacterium, named Synthia, could replicate and produce proteins.[39][40] Four years later this was taken a step further when bacterium was developed that replicated a plasmid containing a unique base pair, creating the first organism engineered to use an expanded genetic alphabet.[41][42] In 2013, researcher reported the first use of clustered regularly interspaced short palindromic repeats (CRISPR), a technique which can be used to easily alter the genome of almost any organism.[43]

Process

Creating a GMO is a multi-step process. Genetic engineers must first choose what gene they wish to insert into the organism. This is driven by what the aim is for the resultant organism and is built on earlier research. Screens can be carried out to determine potential genes and further tests then used to identify the best candidates. The development of microarrays, transcriptomes and genome sequencing has made it much easier to find suitable genes.[44] Luck also plays its part; the round-up ready gene was discovered after scientists noticed a bacterium thriving in the presence of the herbicide.[45]

Gene isolation and cloning

The next step is to isolate the candidate gene. The cell containing the gene is opened and the DNA is purified.[46] The gene is separated by using restriction enzymes to cut the DNA into fragments[47] or polymerase chain reaction (PCR) to amplify up the gene segment.[48] These segments can then be extracted through gel electrophoresis. If the chosen gene or the donor organism's genome has been well studied it may already be accessible from a genetic library. If the DNA sequence is known, but no copies of the gene are available, it can also be artificially synthesized.[49] Once isolated the gene is ligated into a plasmid that is then inserted into a bacterium. The plasmid is replicated when the bacteria divide, ensuring unlimited copies of the gene are available.[50]

Before the gene is inserted into the target organism it must be combined with other genetic elements. These include a promoter and terminator region, which initiate and end transcription. A selectable marker gene is added, which in most cases confers antibiotic resistance, so researchers can easily determine which cells have been successfully transformed. The gene can also be modified at this stage for better expression or effectiveness. These manipulations are carried out using recombinant DNA techniques, such as restriction digests, ligations and molecular cloning.[51]

Inserting DNA into the host genome

There are a number of techniques available for inserting the gene into the host genome. Some bacteria can naturally take up foreign DNA. This ability can be induced in other bacteria via stress (e.g. thermal or electric shock), which increases the cell membrane's permeability to DNA; up-taken DNA can either integrate with the genome or exist as extrachromosomal DNA. DNA is generally inserted into animal cells using microinjection, where it can be injected through the cell's nuclear envelope directly into the nucleus, or through the use of viral vectors.[52]

A. tumefaciens attaching itself to a carrot cell

In plants the DNA is generally inserted using Agrobacterium-mediated recombination,[53] taking advantage of the Agrobacteriums T-DNA sequence that allows natural insertion of genetic material into plant cells.[54] Another method is biolistics, where particles of gold or tungsten are coated with DNA and then shot into young plant cells or plant embryos.[55] Another transformation method for plant and animal cells is electroporation. This involves subjecting the cell to an electric shock, which can make the cell membrane permeable to plasmid DNA. Due to the damage caused to the cells and DNA the transformation efficiency of biolistics and electroporation is lower than agrobacterial mediated transformation and microinjection.[56]

As only a single cell is transformed with genetic material, the organism must be regenerated from that single cell. As bacteria consist of a single cell and reproduce clonally regeneration is not necessary. In plants this is accomplished through the use of tissue culture. In animals it is necessary to ensure that the inserted DNA is present in the embryonic stem cells. Selectable markers are used to easily differentiate transformed from untransformed cells. These markers are usually present in the transgenic organism, although a number of strategies have been developed that can remove the selectable marker from the mature transgenic plant.[57]

Further testing using PCR, Southern hybridization, and DNA sequencing is conducted to confirm that an organism contains the new gene. These tests can also confirm the chromosomal location and copy number of the inserted gene. The presence of the gene does not guarantee it will be expressed at appropriate levels in the target tissue so methods that look for and measure the gene products (RNA and protein) are also used. These include northern hybridization, quantitative RT-PCR, Western blot, immunofluorescence, ELISA and phenotypic analysis. All offspring from the first generation will be heterozygous for the inserted gene and must be mated together to produce a homozygous animal. For stable transformation the gene should be passed to the offspring in a Mendelian inheritance pattern, so the organism's offspring are also studied.

The new genetic material can be inserted randomly within the host genome or targeted to a specific location. The technique of gene targeting uses homologous recombination to make desired changes to a specific endogenous gene. This tends to occur at a relatively low frequency in plants and animals and generally requires the use of selectable markers. The frequency of gene targeting can be greatly enhanced through genome editing. Genome editing uses artificially engineered nucleases that create specific double-stranded breaks at desired locations in the genome, and use the cell’s endogenous mechanisms to repair the induced break by the natural processes of homologous recombination and nonhomologous end-joining. There are currently four families of engineered nucleases: meganucleases,[58][59] zinc finger nucleases,[60][61] transcription activator-like effector nucleases (TALENs),[62][63] and the Cas9-guideRNA system (adapted from CRISPR).[64][65] In addition to enhancing gene targeting, engineered nucleases can be used to introduce mutations at endogenous genes that generate a gene knockout.[66][67]

Applications

Genetic engineering has applications in medicine, research, industry and agriculture and can be used on a wide range of plants, animals and micro organisms. Bacteria, the first organisms to be genetically modified, can have plasmid DNA inserted containing new genes that code for medicines or enzymes that process food and other substrates.[68][69] Plants have been modified for insect protection, herbicide resistance, virus resistance, enhanced nutrition, tolerance to environmental pressures and the production of edible vaccines.[70] Most commercialised GMOs are insect resistant and/or herbicide tolerant crop plants.[71] Genetically modified animals have been used for research, model animals and the production of agricultural or pharmaceutical products. The genetically modified animals include animals with genes knocked out, increased susceptibility to disease, hormones for extra growth and the ability to express proteins in their milk.[72]

Medicine

Genetic engineering has many applications to medicine that include the manufacturing of drugs, creation of model animals that mimic human conditions and gene therapy. One of the earliest uses of genetic engineering was to mass-produce human insulin in bacteria.[27] This application has now been applied to, human growth hormones, follistim (for treating infertility), human albumin, monoclonal antibodies, antihemophilic factors, vaccines and many other drugs.[73][74] Mouse hybridomas, cells fused together to create monoclonal antibodies, have been humanised through genetic engineering to create human monoclonal antibodies.[75] Genetically engineered viruses are being developed that can still confer immunity, but lack the infectious sequences.[76]

Genetic engineering is used to create animal models of human diseases. Genetically modified mice are the most common genetically engineered animal model.[77] They have been used to study and model cancer (the oncomouse), obesity, heart disease, diabetes, arthritis, substance abuse, anxiety, aging and Parkinson disease.[78] Potential cures can be tested against these mouse models. Also genetically modified pigs have been bred with the aim of increasing the success of pig to human organ transplantation.[79]

Gene therapy is the genetic engineering of humans, generally by replacing defective genes with effective ones. Clinical research using somatic gene therapy has been conducted with several diseases, including X-linked SCID,[80] chronic lymphocytic leukemia (CLL),[81][82] and Parkinson's disease.[83] In 2012, Glybera became the first gene therapy treatment to be approved for clinical use.[84][85] Germline gene therapy would result in any change being inheritable, which has raised concerns within the scientific community.[86][87] In 2015, CRISPR was used to edit the DNA of non-viable human embryos,[88][89] leading scientists of major world academies to called for a moratorium on inheritable human genome edits.[90] There are also concerns that the technology could be used not just for treatment, but for enhancement, modification or alteration of a human beings' appearance, adaptability, intelligence, character or behavior.[91] The distinction between cure and enhancement can also be difficult to establish.[92]

Research

Knockout mice
Human cells in which some proteins are fused with green fluorescent protein to allow them to be visualised

Genetic engineering is an important tool for natural scientists. Genes and other genetic information from a wide range of organisms are transformed into bacteria for storage and modification, creating genetically modified bacteria in the process. Bacteria are cheap, easy to grow, clonal, multiply quickly, relatively easy to transform and can be stored at -80 °C almost indefinitely. Once a gene is isolated it can be stored inside the bacteria providing an unlimited supply for research.

Organisms are genetically engineered to discover the functions of certain genes. This could be the effect on the phenotype of the organism, where the gene is expressed or what other genes it interacts with. These experiments generally involve loss of function, gain of function, tracking and expression.

Industrial

Organisms can have their cells transformed with a gene coding for a useful protein, such as an enzyme, so that they will overexpress the desired protein. Mass quantities of the protein can then be manufactured by growing the transformed organism in bioreactor equipment using industrial fermentation, and then purifying the protein.[93] Some genes do not work well in bacteria, so yeast, insect cells or mammalians cells can also be used.[94] These techniques are used to produce medicines such as insulin, human growth hormone, and vaccines, supplements such as tryptophan, aid in the production of food (chymosin in cheese making) and fuels.[95] Other applications with genetically engineered bacteria could involve making them perform tasks outside their natural cycle, such as making biofuels,[96] cleaning up oil spills, carbon and other toxic waste[97] and detecting arsenic in drinking water.[98] Certain genetically modified microbes can also be used in biomining and bioremediation, due to their ability to extract heavy metals from their environment and incorporate them into compounds that are more easily recoverable.[99]

In materials science, a genetically modified virus has been used in an academic lab as a scaffold for assembling a more environmentally friendly lithium-ion battery.[100][101] Bacteria have also been engineered to function as sensors by expressing a fluorescent protein under certain environmental conditions.[102]

Agriculture

Bt-toxins present in peanut leaves (bottom image) protect it from extensive damage caused by European corn borer larvae (top image).[103]

One of the best-known and controversial applications of genetic engineering is the creation and use of genetically modified crops or genetically modified livestock to produce genetically modified food. Crops have been developed to increase production, increase tolerance to abiotic stresses, alter the composition of the food, or to produce novel products.[104]

The first crops to be realised commercially on a large scale provided protection from insect pests or tolerance to herbicides. Fungal and virus resistant crops have also being developed or are in development.[105][106] This make the insect and weed management of crops easier and can indirectly increase crop yield.[107][108] GM crops that directly improve yield by accelerating growth or making the plant more hardy (by improving salt, cold or drought tolerance) are also under development.[109] Salmon have been genetically modified with growth hormones to increase their size.[110][111]

GMOs have been developed that modify the quality of produce by increasing the nutritional value or providing more industrially useful qualities or quantities.[109] The Amflora potato produces a more industrially useful blend of starches. Cows have been engineered to produce more protein in their milk to facilitate cheese production.[112] Soybeans and canola have been genetically modified to produce more healthy oils.[113][114] The first commercialised GM food was a tomato that had delayed ripening, increasing its shelf life.[115]

Plants and animals have been engineered to produce materials they do not normally make. Pharming uses crops as bioreactors to produce vaccines, drug intermediates, or the drugs themselves; the useful product is purified from the harvest and then used in the standard pharmaceutical production process.[116] Cows and goats have been engineered to express drugs and other proteins in their milk, and in 2009 the FDA approved a drug produced in goat milk.[117][118]

Other applications

Genetic engineering has potential applications in conservation and natural areas management. Gene transfer through viral vectors has been proposed as a means of controlling invasive species as well as vaccinating threatened fauna from disease.[119] Transgenic trees have been suggested as a way to confer resistance to pathogens in wild populations.[120] With the increasing risks of maladaptation in organisms as a result of climate change and other perturbations, facilitated adaptation through gene tweaking could be one solution to reducing extinction risks.[121] Applications of genetic engineering in conservation are thus far mostly theoretical and have yet to be put into practice.

Genetic engineering is also being used to create BioArt.[122] Some bacteria have been genetically engineered to create black and white photographs.[123] Novelty items such as lavender-colored carnations,[124] blue roses,[125] and glowing fish[126][127] have also been produced through genetic engineering.

Regulation

The regulation of genetic engineering concerns the approaches taken by governments to assess and manage the risks associated with the development and release of GMOs. The development of a regulatory framework began in 1975, at Asilomar, California.[128] The Asilomar meeting recommended a set of voluntary guidelines regarding the use of recombinant technology.[129] As the technology improved USA established a committee at the Office of Science and Technology,[130] which assigned regulatory approval of GM plants to the USDA, FDA and EPA.[131] The Cartagena Protocol on Biosafety, an international treaty that governs the transfer, handling, and use of GMOs,[132] was adopted on 29 January 2000.[133] One hundred and fifty-seven countries are members of the Protocol and many use it as a reference point for their own regulations.[134]

The legal and regulatory status of GM foods varies by country, with some nations banning or restricting them, and others permitting them with widely differing degrees of regulation.[135][136][137][138] Some countries allow the import of GM food with authorization, but either do not allow its cultivation (Russia, Norway, Israel) or have provisions for cultivation, but no GM products are yet produced (Japan, South Korea). Most countries that do not allow for GMO cultivation do permit research.[139] Some of the most marked differences occurring between the USA and Europe. The US policy focuses on the product (not the process), only looks at verifiable scientific risks and uses the concept of substantial equivalence.[140] The European Union by contrast has possibly the most stringent GMO regulations in the world.[141] All GMOs, along with irradiated food, are considered "new food" and subject to extensive, case-by-case, science-based food evaluation by the European Food Safety Authority. The criteria for authorization fall in four broad categories: "safety," "freedom of choice," "labelling," and "traceability."[142] The level of regulation in other countries that cultivate GMOs lie in between Europe and the United States.

The regulation agencies by geographical regions
Region Regulator/s Notes
USA USDA, FDA and EPA[131]
Europe European Food Safety Authority[142]
Canada Health Canada and the Canadian Food Inspection Agency[143][144] Based on whether a product has novel features regardless of method of origin[145][146]
Africa Common Market for Eastern and Southern Africa[147] Final decision lies with each individual country.[147]
China Office of Agricultural Genetic Engineering Biosafety Administration[148]
India Institutional Biosafety Committee, Review Committee on Genetic Manipulation and Genetic Engineering Approval Committee[149]
Argentina National Agricultural Biotechnology Advisory Committee (environmental impact), the National Service of Health and Agrifood Quality (food safety) and the National Agribusiness Direction (effect on trade)[150] Fnal decision made by the Secretariat of Agriculture, Livestock, Fishery and Food.[150]
Brazil National Biosafety Technical Commission (environmental and food safety) and the Council of Ministers (commercial and economical issues)[150]
Australia Office of the Gene Technology Regulator (overseas all), Therapeutic Goods Administration (GM medicines) and Food Standards Australia New Zealand (GM food).[151][152] The individual state governments can then assess the impact of release on markets and trade and apply further legislation to control approved genetically modified products.[152]

One of the key issues concerning regulators is whether GM products should be labeled. The European Commission says that mandatory labeling and traceability are needed to allow for informed choice, avoid potential False advertising[153] and facilitate the withdrawal of products if adverse effects on health or the environment are discovered.[154] The American Medical Association[155] and the American Association for the Advancement of Science[156] say that absent scientific evidence of harm even voluntary labeling is misleading and will falsely alarm consumers". Labeling of GMO products in the marketplace is required in 64 countries.[157] Labeling can be mandatory up to a threshold GM content level (which varies between countries) or voluntary. In Canada and the USA labeling of GM food is voluntary,[158] while in Europe all food (including processed food) or feed which contains greater than 0.9% of approved GMOs must be labelled.[141]

Controversy

Critics have objected to the use of genetic engineering on several grounds, that include ethical, ecological and economic concerns. Many of these concerns involve GM crops and whether food produced from them is safe, whether it should be labeled and what impact growing them will have on the environment. These controversies have led to litigation, international trade disputes, and protests, and to restrictive regulation of commercial products in some countries.[159]

Accusations that scientists are "playing God" and other religious issues have been ascribed to the technology from the beginning.[160] Other ethical issues raised include the patenting of life,[161] the use of intellectual property rights,[162] the level of labeling on products,[163][164] control of the food supply[165] and the objectivity of the regulatory process.[166] Although doubts have been raised,[167] economically most studies have found growing GM crops to be beneficial to farmers.[168][169][170]

Gene flow between GM crops and compatible plants, along with increased use of selective herbicides, can increase the risk of "superweeds" developing.[171] Other environmental concerns involve potential impacts on non-target organisms, including soil microbes,[172] and an increase in secondary and resistant insect pests.[173][174] Many of the environmental impacts regarding GM crops may take many years to be understood are also evident in conventional agriculture practices.[172][175] With the commercialisation of genetically modified fish there are concerns over what the environmental consequences will be if they escape.[176]

There are three main concerns over the safety of genetically modified food; whether they may provoke an allergic reaction, whether the genes could transfer from the food into human cells, and whether the genes not approved for human consumption could outcross to other crops.[177] There is a scientific consensus[178][179][180][181] that currently available food derived from GM crops poses no greater risk to human health than conventional food,[182][183][184][185][186] but that each GM food needs to be tested on a case-by-case basis before introduction.[187][188][189] Nonetheless, members of the public are much less likely than scientists to perceive GM foods as safe.[190][191][192][193]

See also

References

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  173. ↑ Dively, Galen P.; Venugopal, P. Dilip; Finkenbinder, Chad (2016-12-30). "Field-Evolved Resistance in Corn Earworm to Cry Proteins Expressed by Transgenic Sweet Corn". PLOS ONE. 11 (12): e0169115. ISSN 1932-6203. PMC 5201267 Freely accessible. PMID 28036388. doi:10.1371/journal.pone.0169115.
  174. ↑ Qiu, Jane (2010-05-13). "GM crop use makes minor pests major problem". Nature News. doi:10.1038/news.2010.242.
  175. ↑ Gilbert, Natasha (2013-05-02). "Case studies: A hard look at GM crops". Nature. 497 (7447): 24–26. PMID 23636378. doi:10.1038/497024a.
  176. ↑ "Are GMO Fish Safe for the Environment? | Accumulating Glitches | Learn Science at Scitable". www.nature.com. Retrieved 2017-05-07.
  177. ↑ "Q&A: genetically modified food". World Health Organization. Retrieved 2017-05-07.
  178. ↑ Nicolia, Alessandro; Manzo, Alberto; Veronesi, Fabio; Rosellini, Daniele (2013). "An overview of the last 10 years of genetically engineered crop safety research" (PDF). Critical Reviews in Biotechnology. 34: 1–12. PMID 24041244. doi:10.3109/07388551.2013.823595. We have reviewed the scientific literature on GE crop safety for the last 10 years that catches the scientific consensus matured since GE plants became widely cultivated worldwide, and we can conclude that the scientific research conducted so far has not detected any significant hazard directly connected with the use of GM crops.

    The literature about Biodiversity and the GE food/feed consumption has sometimes resulted in animated debate regarding the suitability of the experimental designs, the choice of the statistical methods or the public accessibility of data. Such debate, even if positive and part of the natural process of review by the scientific community, has frequently been distorted by the media and often used politically and inappropriately in anti-GE crops campaigns.

  179. ↑ "State of Food and Agriculture 2003–2004. Agricultural Biotechnology: Meeting the Needs of the Poor. Health and environmental impacts of transgenic crops". Food and Agriculture Organization of the United Nations. Retrieved February 8, 2016. Currently available transgenic crops and foods derived from them have been judged safe to eat and the methods used to test their safety have been deemed appropriate. These conclusions represent the consensus of the scientific evidence surveyed by the ICSU (2003) and they are consistent with the views of the World Health Organization (WHO, 2002). These foods have been assessed for increased risks to human health by several national regulatory authorities (inter alia, Argentina, Brazil, Canada, China, the United Kingdom and the United States) using their national food safety procedures (ICSU). To date no verifiable untoward toxic or nutritionally deleterious effects resulting from the consumption of foods derived from genetically modified crops have been discovered anywhere in the world (GM Science Review Panel). Many millions of people have consumed foods derived from GM plants - mainly maize, soybean and oilseed rape - without any observed adverse effects (ICSU).
  180. ↑ Ronald, Pamela (May 5, 2011). "Plant Genetics, Sustainable Agriculture and Global Food Security". Genetics. 188: 11–20. PMC 3120150 Freely accessible. PMID 21546547. doi:10.1534/genetics.111.128553. There is broad scientific consensus that genetically engineered crops currently on the market are safe to eat. After 14 years of cultivation and a cumulative total of 2 billion acres planted, no adverse health or environmental effects have resulted from commercialization of genetically engineered crops (Board on Agriculture and Natural Resources, Committee on Environmental Impacts Associated with Commercialization of Transgenic Plants, National Research Council and Division on Earth and Life Studies 2002). Both the U.S. National Research Council and the Joint Research Centre (the European Union's scientific and technical research laboratory and an integral part of the European Commission) have concluded that there is a comprehensive body of knowledge that adequately addresses the food safety issue of genetically engineered crops (Committee on Identifying and Assessing Unintended Effects of Genetically Engineered Foods on Human Health and National Research Council 2004; European Commission Joint Research Centre 2008). These and other recent reports conclude that the processes of genetic engineering and conventional breeding are no different in terms of unintended consequences to human health and the environment (European Commission Directorate-General for Research and Innovation 2010).
  181. ↑ But see also: Domingo, José L.; Bordonaba, Jordi Giné (2011). "A literature review on the safety assessment of genetically modified plants" (PDF). Environment International. 37: 734–742. PMID 21296423. doi:10.1016/j.envint.2011.01.003. In spite of this, the number of studies specifically focused on safety assessment of GM plants is still limited. However, it is important to remark that for the first time, a certain equilibrium in the number of research groups suggesting, on the basis of their studies, that a number of varieties of GM products (mainly maize and soybeans) are as safe and nutritious as the respective conventional non-GM plant, and those raising still serious concerns, was observed. Moreover, it is worth mentioning that most of the studies demonstrating that GM foods are as nutritional and safe as those obtained by conventional breeding, have been performed by biotechnology companies or associates, which are also responsible of commercializing these GM plants. Anyhow, this represents a notable advance in comparison with the lack of studies published in recent years in scientific journals by those companies. Krimsky, Sheldon (2015). "An Illusory Consensus behind GMO Health Assessment" (PDF). Science, Technology, & Human Values. 40: 1–32. doi:10.1177/0162243915598381. I began this article with the testimonials from respected scientists that there is literally no scientific controversy over the health effects of GMOs. My investigation into the scientific literature tells another story. And contrast:

    Panchin, Alexander Y.; Tuzhikov, Alexander I. (January 14, 2016). "Published GMO studies find no evidence of harm when corrected for multiple comparisons". Critical Reviews in Biotechnology: 1–5. ISSN 0738-8551. PMID 26767435. doi:10.3109/07388551.2015.1130684. Here, we show that a number of articles some of which have strongly and negatively influenced the public opinion on GM crops and even provoked political actions, such as GMO embargo, share common flaws in the statistical evaluation of the data. Having accounted for these flaws, we conclude that the data presented in these articles does not provide any substantial evidence of GMO harm.

    The presented articles suggesting possible harm of GMOs received high public attention. However, despite their claims, they actually weaken the evidence for the harm and lack of substantial equivalency of studied GMOs. We emphasize that with over 1783 published articles on GMOs over the last 10 years it is expected that some of them should have reported undesired differences between GMOs and conventional crops even if no such differences exist in reality. and

    Yang, Y.T.; Chen, B. (2016). "Governing GMOs in the USA: science, law and public health". Journal of the Science of Food and Agriculture. 96: 1851–1855. PMID 26536836. doi:10.1002/jsfa.7523. It is therefore not surprising that efforts to require labeling and to ban GMOs have been a growing political issue in the USA (citing Domingo and Bordonaba, 2011).

    Overall, a broad scientific consensus holds that currently marketed GM food poses no greater risk than conventional food... Major national and international science and medical associations have stated that no adverse human health effects related to GMO food have been reported or substantiated in peer-reviewed literature to date.

    Despite various concerns, today, the American Association for the Advancement of Science, the World Health Organization, and many independent international science organizations agree that GMOs are just as safe as other foods. Compared with conventional breeding techniques, genetic engineering is far more precise and, in most cases, less likely to create an unexpected outcome.

  182. ↑ "Statement by the AAAS Board of Directors On Labeling of Genetically Modified Foods" (PDF). American Association for the Advancement of Science. October 20, 2012. Retrieved February 8, 2016. The EU, for example, has invested more than €300 million in research on the biosafety of GMOs. Its recent report states: "The main conclusion to be drawn from the efforts of more than 130 research projects, covering a period of more than 25 years of research and involving more than 500 independent research groups, is that biotechnology, and in particular GMOs, are not per se more risky than e.g. conventional plant breeding technologies." The World Health Organization, the American Medical Association, the U.S. National Academy of Sciences, the British Royal Society, and every other respected organization that has examined the evidence has come to the same conclusion: consuming foods containing ingredients derived from GM crops is no riskier than consuming the same foods containing ingredients from crop plants modified by conventional plant improvement techniques.Pinholster, Ginger (October 25, 2012). "AAAS Board of Directors: Legally Mandating GM Food Labels Could "Mislead and Falsely Alarm Consumers"". American Association for the Advancement of Science. Retrieved February 8, 2016.
  183. ↑ "A decade of EU-funded GMO research (2001–2010)" (PDF). Directorate-General for Research and Innovation. Biotechnologies, Agriculture, Food. European Commission, European Union. 2010. ISBN 978-92-79-16344-9. doi:10.2777/97784. Retrieved February 8, 2016.
  184. ↑ "AMA Report on Genetically Modified Crops and Foods (online summary)". American Medical Association. January 2001. Retrieved March 19, 2016. A report issued by the scientific council of the American Medical Association (AMA) says that no long-term health effects have been detected from the use of transgenic crops and genetically modified foods, and that these foods are substantially equivalent to their conventional counterparts. (from online summary prepared by ISAAA)" "Crops and foods produced using recombinant DNA techniques have been available for fewer than 10 years and no long-term effects have been detected to date. These foods are substantially equivalent to their conventional counterparts. (from original report by AMA: )"REPORT 2 OF THE COUNCIL ON SCIENCE AND PUBLIC HEALTH (A-12): Labeling of Bioengineered Foods" (PDF). American Medical Association. 2012. Archived from the original on 7 September 2012. Retrieved March 19, 2016. Bioengineered foods have been consumed for close to 20 years, and during that time, no overt consequences on human health have been reported and/or substantiated in the peer-reviewed literature.
  185. ↑ "Restrictions on Genetically Modified Organisms: United States. Public and Scholarly Opinion". Library of Congress. June 9, 2015. Retrieved February 8, 2016. Several scientific organizations in the US have issued studies or statements regarding the safety of GMOs indicating that there is no evidence that GMOs present unique safety risks compared to conventionally bred products. These include the National Research Council, the American Association for the Advancement of Science, and the American Medical Association. Groups in the US opposed to GMOs include some environmental organizations, organic farming organizations, and consumer organizations. A substantial number of legal academics have criticized the US's approach to regulating GMOs.
  186. ↑ "Genetically Engineered Crops: Experiences and Prospects". The National Academies of Sciences, Engineering, and Medicine (US). 2016. p. 149. Retrieved May 19, 2016. Overall finding on purported adverse effects on human health of foods derived from GE crops: On the basis of detailed examination of comparisons of currently commercialized GE with non-GE foods in compositional analysis, acute and chronic animal toxicity tests, long-term data on health of livestock fed GE foods, and human epidemiological data, the committee found no differences that implicate a higher risk to human health from GE foods than from their non-GE counterparts.
  187. ↑ "Frequently asked questions on genetically modified foods". World Health Organization. Retrieved February 8, 2016. Different GM organisms include different genes inserted in different ways. This means that individual GM foods and their safety should be assessed on a case-by-case basis and that it is not possible to make general statements on the safety of all GM foods.

    GM foods currently available on the international market have passed safety assessments and are not likely to present risks for human health. In addition, no effects on human health have been shown as a result of the consumption of such foods by the general population in the countries where they have been approved. Continuous application of safety assessments based on the Codex Alimentarius principles and, where appropriate, adequate post market monitoring, should form the basis for ensuring the safety of GM foods.

  188. ↑ Haslberger, Alexander G. (2003). "Codex guidelines for GM foods include the analysis of unintended effects". Nature Biotechnology. 21: 739–741. PMID 12833088. doi:10.1038/nbt0703-739. These principles dictate a case-by-case premarket assessment that includes an evaluation of both direct and unintended effects.
  189. ↑ Some medical organizations, including the British Medical Association, advocate further caution based upon the precautionary principle:

    "Genetically modified foods and health: a second interim statement" (PDF). British Medical Association. March 2004. Retrieved March 21, 2016. In our view, the potential for GM foods to cause harmful health effects is very small and many of the concerns expressed apply with equal vigour to conventionally derived foods. However, safety concerns cannot, as yet, be dismissed completely on the basis of information currently available.

    When seeking to optimise the balance between benefits and risks, it is prudent to err on the side of caution and, above all, learn from accumulating knowledge and experience. Any new technology such as genetic modification must be examined for possible benefits and risks to human health and the environment. As with all novel foods, safety assessments in relation to GM foods must be made on a case-by-case basis.

    Members of the GM jury project were briefed on various aspects of genetic modification by a diverse group of acknowledged experts in the relevant subjects. The GM jury reached the conclusion that the sale of GM foods currently available should be halted and the moratorium on commercial growth of GM crops should be continued. These conclusions were based on the precautionary principle and lack of evidence of any benefit. The Jury expressed concern over the impact of GM crops on farming, the environment, food safety and other potential health effects.

    The Royal Society review (2002) concluded that the risks to human health associated with the use of specific viral DNA sequences in GM plants are negligible, and while calling for caution in the introduction of potential allergens into food crops, stressed the absence of evidence that commercially available GM foods cause clinical allergic manifestations. The BMA shares the view that that there is no robust evidence to prove that GM foods are unsafe but we endorse the call for further research and surveillance to provide convincing evidence of safety and benefit.

  190. ↑ Funk, Cary; Rainie, Lee (January 29, 2015). "Public and Scientists' Views on Science and Society". Pew Research Center. Retrieved February 24, 2016. The largest differences between the public and the AAAS scientists are found in beliefs about the safety of eating genetically modified (GM) foods. Nearly nine-in-ten (88%) scientists say it is generally safe to eat GM foods compared with 37% of the general public, a difference of 51 percentage points.
  191. ↑ Marris, Claire (2001). "Public views on GMOs: deconstructing the myths" (PDF). EMBO Reports. 2: 545–548. PMC 1083956 Freely accessible. PMID 11463731. doi:10.1093/embo-reports/kve142.
  192. ↑ Final Report of the PABE research project (December 2001). "Public Perceptions of Agricultural Biotechnologies in Europe". Commission of European Communities. Retrieved February 24, 2016.
  193. ↑ Scott, Sydney E.; Inbar, Yoel; Rozin, Paul (2016). "Evidence for Absolute Moral Opposition to Genetically Modified Food in the United States" (PDF). Perspectives on Psychological Science. 11 (3): 315–324. PMID 27217243. doi:10.1177/1745691615621275.

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