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Genetic pollution

From Wikipedia, the free encyclopedia

Genetic pollution is a controversial[1][2] term for uncontrolled[3][4] gene flow into wild populations. It is defined as “the dispersal of contaminated altered genes from genetically engineered organisms to natural organisms, esp. by cross-pollination”,[5] but has come to be used in some broader ways. It is related to the population genetics concept of gene flow, and genetic rescue, which is genetic material intentionally introduced to increase the fitness of a population.[6] It is called genetic pollution when it negatively impacts on the fitness of a population, such as through outbreeding depression and the introduction of unwanted phenotypes which can lead to extinction.

Conservation biologists and conservationists have used the term to describe gene flow from domestic, feral, and non-native species into wild indigenous species, which they consider undesirable. They promote awareness of the effects of introduced invasive species that may "hybridize with native species, causing genetic pollution". In the fields of agriculture, agroforestry and animal husbandry, genetic pollution is used to describe gene flows between genetically engineered species and wild relatives. The use of the word “pollution” is meant to convey the idea that mixing genetic information is bad for the environment, but because the mixing of genetic information can lead to a variety of outcomes, “pollution” may not always be the most accurate descriptor.

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  • ✪ Are GMOs Good or Bad? Genetic Engineering & Our Food
  • ✪ 10 Most BIZARRE Genetically Modified Plants EVER
  • ✪ The Terrifying Truth About Bananas
  • ✪ Let’s Talk About GMOs And The Environment | Pros & Cons of GMOs | GMO Answers
  • ✪ CRISPR: A Gene-Editing Superpower

Transcription

GMOs are one of the most controversial areas of science. Genetic engineering is used in many fields, but even though medical applications like GM insulin are widely accepted, The debate heats up when it comes to food and agriculture. Why is that? Why is the same thing treated so differently? Let's try to get to the bottom of this and explore the facts, the fears, and the future of GMOs. Humans have been genetically modifing plants and animals for thousands of years. Maybe a few of your crops had very good yields. Maybe one of your wolves was especially loyal. So you did the smart thing, and bred the plants and animals that had traits beneficial to you. Traits suggest an expression of genes. So with each generation, those genes got more pronounced. After thousands of years, almost every single plant and animal around is vastly different from it's pre-domesticated state. If humans have been changing genes for millennia, what makes a so called "Genetically Modified Organism", or GMO, different? Selective breeding is basically hoping for lucky hits. Genetic engineering eliminates this factor. We can choose the traits we want. Make fruit grow bigger... ...immune to pests, and so on... So, why are people concerned about them ? Let's start with one of the most common objections to GMOs... Gene flow, meaning GM crops could mix with traditional crops and introduce unwanted new characteristics into them. There is a method that might guarantee complete prevention, but is a big anti-GMO argument by itself. Terminator seeds. The idea is that they could produce sterile plants, requiring farmers to buy new seeds every year. The very concept of this, however, caused a public outcry, stopping the technology being put to use. This brings us back to the unintentional spreading of engineer DNA. There have been cases of GMOs growing where they weren't planted, and traces of modified genes found in foreign crops. The GM plants can't run wild entirely. Many crops pollinate themselves, and all crops have to be related to mingle. There are also cultural methods like buffer zones, to keep unintentional crossing at a minimum. But if it's possible in principal that a GMO could unintentionally cross with a non-GMO... There's actually a more important question. Is food that comes from GM crops different to food from non-GM crops? This question has been a major concern from the very beginning. GM plants that are destined to be eaten are checked for possible dangers, and the results are evaluated by multiple agencies. After more than 30 years and thousands of studies, the science is in. Eating GMO plants is no more risky than their non-GMO equivalent. But don't just take it our word for it, the sources for this and other claims are in the video description. But what about plants that have been engineered to be toxic? For example, BT crops. A gene borrowed from the bacterium Bacillus Thuringiensis, lets engineered plants produce a protein that destroys the digestive system of specific insect pests. The plant makes its own pesticide. Insects that eat it die. That sounds alarming! Pesticide sprays could be washed off. While the poison in BT crops is inside the plant. But actually, it's not a big deal. Poison is really just a question of different perspectives. What's harmless to one species, might kill another. Coffee, for example, is a poison that kills insects but it's harmless to us. Or take chocolate, it's dangerous to dogs but a pleasure for humans. BT crops produce a protein that is tailored to the specific design of the digestive tract of certain insects; it's completely harmless for us. There's also the opposite approach. Plants that are engineered to be resistant to certain weed killers. This way, farmers can use them widely, killing the other plants competing for resources without harming the crop. Here, we get to the dark underbelly of GMOs. For the pesticide industry, they are big business. Over 90% of all cashed crops in the US are herbicide resistant, mostly to glyphosate. As a result, the use of glyphosate has increased greatly. That isn't only bad, glyphosate is much less harmful to humans than many other herbicides. Still, this means famers have a strong incentive to rely on this one method only, casting more balanced ways of managing weeds aside. That's one of the most fundamental problems with the GMO debate. Much of the criticism of this technology is actually criticism of modern agriculture and a business practice of the huge corporations that control our food supply. This criticism is not only valid, it's also important. We need to change agriculture to a more sustainable model. GMOs as a technology are actually an ally and not a enemy in that fight, helping to save and protect nature and minimize our impact on the environment. Let's look at some positive examples. Eggplant is an important crop in Bangladesh but often, whole harvests are destroyed by pests. Farmers had to rely heavily on pesticides. Not only was this very expensive, Farmers also frequently got sick. The introduction of a new GM eggplant in 2013 stopped this. The same BT protein we talked about before, an effective killer of insects but harmless to humans, was engineered into them. This reduced insecticide use on eggplants by more than 80%. The health of farmers improved, and their income rose dramatically. And sometimes, the GM approach is the only option. In the 1990s, the papaya industry in Hawaii was under attack from the ringspot virus which threatened to wipe out Hawaiian papaya. The solution was a papaya genetically modified to be vaccinated against the ringspot virus. Without it, the state's papaya industry would have collapsed. All these stories show a very narrow application. 99% of all GMOs we use right now produce pesticides, or are resistant against them. There is so much more we could do. The scientists are working on GMOs that could improve our diet. Plants that produce more or different nutrients, like fruit with higher antioxidant levels that help to fight diseases.... ...or rice with additional vitamins. On a larger scale, we're trying to engineer plants more resilient to climate change, plants that can better adapt to erratic weather and adversarial conditions, making them resistant to droughts or floods. GMOs could also not only reduce agricultural impact on the environment, but actively help to protect it. Scientists are working on crops that can draw nitrogen from the air, like microbes. Nitrogen is a common fertilizer, but its build-up pollutes the ground water and speeds up climate change. Plants that collect their own nitrogen could fix two problems at once. The over use of fertilizers in the developed world, as well as the shortage of it in developing countries. We could even modify plants to become super-effective carbon collectors, like the American chest-nut tree, to mitigate and actually reverse climate change. With the tools we have today, our imagination is the limit. The world eats 11 million pounds of food everyday. A UN estimate suggests we'll need 70% more by 2050. We could grow that food by clearing more and more forests to create fields and pastures and by using more pesticides. Or we find a way to do it on the land we've got right now, with more effective methods like GM crops. Intensifying farming instead of expanding it means GMOs could become the new organic. In a nutshell, GMOs have the potential to not only drastically change agriculture but to also dampen the effects of our own irresponsible behaviour. GMOs could be our most powerful weapon to save our biosphere. This video took more than 600 hours to make, which would be impossible without viewer support on Patreon.com. If you'd like to support carefully researched content it's really very helpful! And you can get your own bird as a reward. If you want to learn more about genetic modification , we have more videos explaining the opportunities and risks of the technology and how it could impact our future. Caption credits are in the description.

Contents

Gene flow to wild population

Some conservation biologists and conservationists have used genetic pollution for a number of years as a term to describe gene flow from a non-native, invasive subspecies, domestic, or genetically-engineered population to a wild indigenous population.[3][7][8]

Importance

The introduction of genetic material into the gene pool of a population by human intervention can have both positive and negative effects on populations. When genetic material is intentionally introduced to increase the fitness of a population, this is called genetic rescue. When genetic material is unintentionally introduced to a population, this is called genetic pollution and can negatively affect the fitness of a population (primarily through outbreeding depression), introduce other unwanted phenotypes, or theoretically lead to extinction.

Introduced species

An introduced species is one that is not native to a given population that is either intentionally or accidentally brought into a given ecosystem. Effects of introduction are highly variable, but if an introduced species has a major negative impact on its new environment, it can be considered an invasive species. One such example is the introduction of the Asian Longhorned beetle in North America, which was first detected in 1996 in Brooklyn, New York. It is believed that these beetles were introduced through cargo at trade ports. The beetles are highly damaging to the environment, and are estimated to cause risk to 35% of urban trees, excluding natural forests.[9] These beetles cause severe damage to the wood of trees by larval funneling. Their presence in the ecosystem destabilizes community structure, having a negative influence on many species in the system. Introduced species are not always disruptive to an environment, however. Tomás Carlo and Jason Gleditch of Penn State University found that the number of invasive honeysuckle plants in the area correlated with the number and diversity of the birds in the Happy Valley Region of Pennsylvania, suggesting introduced honeysuckle plants and birds formed a mutually beneficial relationship.[10] Presence of introduced honeysuckle was associated with higher diversity of the bird populations in that area, demonstrating that introduced species are not always detrimental to a given environment and it is completely context dependent.

Invasive species

Conservation biologists and conservationists have, for a number of years, used the term to describe gene flow from domestic, feral, and non-native species into wild indigenous species, which they consider undesirable.[3][7][8] For example, TRAFFIC is the international wildlife trade monitoring network that works to limit trade in wild plants and animals so that it is not a threat to conservationist goals. They promote awareness of the effects of introduced invasive species that may "hybridize with native species, causing genetic pollution".[11] Furthermore, the Joint Nature Conservation Committee, the statutory adviser to the UK government, has stated that invasive species "will alter the genetic pool (a process called genetic pollution), which is an irreversible change."[12] Invasive species can invade both large and small native populations and have a profound effect. Upon invasion, invasive species interbreed with native species to form sterile or more evolutionarily fit hybrids that can outcompete the native populations. Invasive species can cause extinctions of small populations on islands that are particularly vulnerable due to their smaller amounts of genetic diversity. In these populations, local adaptations can be disrupted by the introduction of new genes that may not be as suitable for the small island environments. For example, the Cercocarpus traskiae of the Catalina Island off the coast of California has faced near extinction with only a single population remaining due to the hybridization of its offspring with Cercocarpus betuloides.[13]

Domestic populations

Increased contact between wild and domesticated populations of organisms can lead to reproductive interactions that are detrimental to the wild population's ability to survive. A wild population is one that lives in natural areas and is not regularly looked after by humans. This contrast with domesticated populations that live in human controlled areas and are regularly, and historically, in contact with humans. Genes from domesticated populations are added to wild populations as a result of reproduction. In many crop populations this can be the result of pollen traveling from farmed crops to neighboring wild plants of the same species. For farmed animals, this reproduction may happen as the result of escaped or released animals.

Aquaculture

Aquaculture is the practice of farming aquatic animals or plants for the purpose of consumption. This practice is becoming increasingly common for the production of salmon. This is specifically termed aquaculture of salmonoids. One of the dangers of this practice is the possibility of domesticated salmon breaking free from their containment. The occurrence of escaping incidents is becoming increasingly common as aquaculture gains popularity.[14][15][16] Farming structures may be ineffective at holding the vast number of fast growing animals they house.[17] Natural disasters, high tides, and other environmental occurrences can also trigger aquatic animal escapes.[18][19] The reason these escapes are considered dangers is the impact they pose for the wild population they reproduce with after escaping. In many instances the wild population experiences a decreased likelihood of survival after reproducing with domesticated populations of salmon.[20][21]

The Washington Department of Fish and Wildlife cites that "commonly expressed concerns surrounding escaped Atlantic salmon include competition with native salmon, predation, disease transfer, hybridization, and colonization"[22] A report done by that organization in 1999 did not find that escaped salmon posed a significant risk to wild populations.[23]

Crops

Crops refer to groups of plants grown for consumption. Despite domestication over many years, these plants are not so far removed from their wild relatives that they could reproduce if brought together. Many crops are still grown in the areas they originated and gene flow between crops and wild relatives impacts the evolution of wild populations.[24] Farmers can avoid reproduction between the different populations by timing their planting of crops so that crops are not flowering when wild relatives would be. Domesticated crops have been changed through artificial selection and genetic engineering. The genetic make up of many crops is different than that of its wild relatives,[25] but the closer they grow to one another the more likely they are to share genes through pollen. Gene flow persists between crops and wild counterparts.

Genetically engineered organisms

Genetically engineered organisms are genetically modified in a laboratory, and therefore distinct from those that were bred through artificial selection. In the fields of agriculture, agroforestry and animal husbandry, genetic pollution is being used to describe gene flows between GE species and wild relatives.[26] An early use of the term "genetic pollution" in this later sense appears in a wide-ranging review of the potential ecological effects of genetic engineering in The Ecologist magazine in July 1989. It was also popularized by environmentalist Jeremy Rifkin in his 1998 book The Biotech Century.[27] While intentional crossbreeding between two genetically distinct varieties is described as hybridization with the subsequent introgression of genes, Rifkin, who had played a leading role in the ethical debate for over a decade before, used genetic pollution to describe what he considered to be problems that might occur due the unintentional process of (modernly) genetically modified organisms (GMOs) dispersing their genes into the natural environment by breeding with wild plants or animals.[26][28][29]

Concerns about negative consequences from gene flow between genetically engineered organisms and wild populations are valid. Most corn and soybean crops grown in the midwestern USA are genetically modified. There are corn and soybean varieties that are resistant to herbicides like glyphosate[30] and corn that produces neonicotinoid pesticide within all of its tissues.[31] These genetic modifications are meant to increase yields of crops but there is little evidence that yields actually increase.[31] While scientists are concerned genetically engineered organisms can have negative effects on surrounding plant and animal communities, the risk of gene flow between genetically engineered organisms and wild populations is yet another concern. Many farmed crops may be weed resistant and reproduce with wild relatives.[32] More research is necessary to understand how much gene flow between genetically engineered crops and wild populations occurs, and the impacts of genetic mixing.

Mutated organisms

Mutations within organisms can be executed through the process of exposing the organism to chemicals or radiation in order to generate mutations. This has been done in plants in order to create mutants that have a desired trait. These mutants can then be bred with other mutants or individuals that are not mutated in order to maintain the mutant trait. However, similar to the risks associated with introducing individuals to a certain environment, the variation created by mutated individuals could have a negative impact on native populations as well.

Preventative measures

Since 2005 there has existed a GM Contamination Register, launched for GeneWatch UK and Greenpeace International that records all incidents of intentional or accidental[33][34] release of organisms genetically modified using modern techniques.[35]

Genetic use restriction technologies (GURTs) were developed for the purpose of property protection, but could be beneficial in preventing the dispersal of transgenes. GeneSafe technologies introduced a method that became known as “Terminator.” This method is based on seeds that produce sterile plants. This would prevent movement of transgenes into wild populations as hybridization would not be possible.[36] However, this technology has never been deployed as it disproportionately negatively affects farmers in developing countries, who save seeds to use each year (whereas in developed countries, farmers generally buy seeds from seed production companies).[36]

Physical containment has also been utilized to prevent the escape of transgenes. Physical containment includes barriers such as filters in labs, screens in greenhouses, and isolation distances in the field. Isolation distances have not always been successful, such as transgene escape from an isolated field into the wild in herbicide-resistant bentgrass Agrostis stolonifera.[37]

Another suggested method that applies specifically to protection traits (e.g. pathogen resistance) is mitigation. Mitigation involves linking the positive trait (beneficial to fitness) to a trait that is negative (harmful to fitness) to wild but not domesticated individuals.[37] In this case, if the protection trait was introduced to a weed, the negative trait would also be introduced in order to decrease overall fitness of the weed and decrease possibility of the individual’s reproduction and thus propagation of the transgene.

Risks

Not all genetically engineered organisms cause genetic pollution. Genetic engineering has a variety of uses and is specifically defined as a direct manipulation of the genome of an organism. Genetic pollution can occur in response to the introduction of a species that is not native to a particular environment, and genetically engineered organisms are examples of individuals that could cause genetic pollution following introduction. Due to these risks, studies have been done in order to assess the risks of genetic pollution associated with organisms that have been genetically engineered:

  1. Genetic In a 10-year study of four different crops, none of the genetically engineered plants were found to be more invasive or more persistent than their conventional counterparts.[38] An often cited claimed example of genetic pollution is the reputed discovery of transgenes from GE maize in landraces of maize in Oaxaca, Mexico. The report from Quist and Chapela,[39] has since been discredited on methodological grounds.[40] The scientific journal that originally published the study concluded that "the evidence available is not sufficient to justify the publication of the original paper." [41] More recent attempts to replicate the original studies have concluded that genetically modified corn is absent from southern Mexico in 2003 and 2004.[42]
  2. A 2009 study verified the original findings of the controversial 2001 study, by finding transgenes in about 1% of 2000 samples of wild maize in Oaxaca, Mexico, despite Nature retracting the 2001 study and a second study failing to back up the findings of the initial study. The study found that the transgenes are common in some fields, but non-existent in others, hence explaining why a previous study failed to find them. Furthermore, not every laboratory method managed to find the transgenes.[43]
  3. A 2004 study performed near an Oregon field trial for a genetically modified variety of creeping bentgrass (Agrostis stolonifera) revealed that the transgene and its associate trait (resistance to the glyphosate herbicide) could be transmitted by wind pollination to resident plants of different Agrostis species, up to 14 km from the test field.[44] In 2007, the Scotts Company, producer of the genetically modified bentgrass, agreed to pay a civil penalty of $500,000 to the United States Department of Agriculture (USDA). The USDA alleged that Scotts "failed to conduct a 2003 Oregon field trial in a manner which ensured that neither glyphosate-tolerant creeping bentgrass nor its offspring would persist in the environment".[45]

Not only are there risks in terms of genetic engineering, but there are risks that emerge from species hybridization In Czechoslovakia, ibex were introduced from Turkey and Sinai to help promote the ibex population there, which caused hybrids that produced offspring too early, which caused the overall population to disappear completely.[46] The genes of each population of the ibex in Turkey and Sinai were locally adapted to their environments so when placed in a new environmental context did not flourish. Additionally, the environmental toll that may arise from the introduction of a new species may be so disruptive that the ecosystem is no longer able to sustain certain populations.

Controversy

Environmentalist perspectives

The use of the word “pollution” in the term genetic pollution has a deliberate negative connotation and is meant to convey the idea that mixing genetic information is bad for the environment. However, because the mixing of genetic information can lead to a variety of outcomes, “pollution” may not be the most accurate descriptor. Gene flow is undesirable according to some environmentalists and conservationists, including groups such as Greenpeace, TRAFFIC, and GeneWatch UK [47][33][35][48][7][11][49]

"Invasive species have been a major cause of extinction throughout the world in the past few hundred years. Some of them prey on native wildlife, compete with it for resources, or spread disease, while others may hybridize with native species, causing "genetic pollution". In these ways, invasive species are as big a threat to the balance of nature as the direct overexploitation by humans of some species."</ref>.[1]

It can also be considered undesirable if it leads to a loss of fitness in the wild populations.[50] The term can be associated with the gene flow from a mutation bred, synthetic organism or genetically engineered organism to a non GE organism,[26] by those who consider such gene flow detrimental.[47] These environmentalist groups stand in complete opposition to the development and production of genetically engineered organisms.

Governmental definition

From a governmental perspective, genetic pollution is defined as follows by the Food and Agriculture Organization of the United Nations:

"Uncontrolled spread of genetic information (frequently referring to transgenes) into the genomes of organisms in which such genes are not present in nature."[51]

Scientific perspectives

Use of the term 'genetic pollution' and similar phrases such as genetic deterioration, genetic swamping, genetic takeover, and genetic aggression, are being debated by scientists as many do not find it scientifically appropriate. Rhymer and Simberloff argue that these types of terms:

"...imply either that hybrids are less fit than the parentals, which need not be the case, or that there is an inherent value in "pure" gene pools.[1]"

They recommend that gene flow from invasive species be termed genetic mixing since:

"Mixing" need not be value-laden, and we use it here to denote mixing of gene pools whether or not associated with a decline in fitness.[1]

Environmentalists such as Patrick Moore, an ex-member and cofounder of Greenpeace, questions if the term genetic pollution is more political than scientific. The term is considered to arouse emotional feelings towards the subject matter.[9] In an interview he comments:

"If you take a term used quite frequently these days, the term "genetic pollution," otherwise referred to as genetic contamination, it is a propaganda term, not a technical or scientific term. Pollution and contamination are both value judgments. By using the word "genetic" it gives the public the impression that they are talking about something scientific or technical--as if there were such a thing as genes that amount to pollution.[2]

Thus, using the term “genetic pollution” is inherently political. A scientific approach to discussing gene flow between introduced and native species would be to use terms like genetic mixing or gene flow. Such mixing can definitely have negative consequences on the fitness of native populations, so it is important not to minimize the risk. However, because genetic mixing can also lead to fitness recovery in cases that could be described as “genetic rescue”, it is important to distinguish that just mixing genes from introduced into native populations can lead to variable outcomes for the fitness of native populations.

See also

References

  1. ^ a b Rhymer JM, Simberloff D (1996). "Extinction by Hybridization and Introgression". Annual Review of Ecology and Systematics. 27: 83–109. doi:10.1146/annurev.ecolsys.27.1.83.
  2. ^ Competitive Enterprise Institute staff (2004). "What's Wrong with the Environmental Movement: an interview with Patrick Moore". Environment News. The Heartland Institute. Archived from the original on 24 November 2006.
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  4. ^ Ellstrand NC (2001). "When Transgenes Wander, Should We Worry?". Plant Physiol. 125: 1543–1545.
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  29. ^ Otchet A (1998). "Jeremy Rifkin: fears of a brave new world". an interview hosted by The United Nations Educational, Scientific and Cultural Organization (UNESCO).
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