What Are GMOs?

Genetically engineered/modified organisms, and products thereof, are produced through techniques in which the genetic material has been altered in a way that does not occur by mating and/ or natural recombination
Techniques of genetic engineering/modification include, but are not limited to: recombinant DNA, cell fusion, micro and macro injection, encapsulation, gene deletion and doubling. Genetically engineered organisms will not include organisms resulting from techqiues such as conjugation, transduction and hybridization. (Codex Alimentarius CAC/GL 32-1999)

What's a GMO?
A GMO (genetically modified organism) is the result of a laboratory process of taking genes from one species and inserting them into another in an attempt to obtain a desired trait or characteristic, hence they are also known as transgenic organisms. This process may be called either Genetic Engineering (GE) or Genetic Modification (GM); they are one and the same. But haven't growers been grafting trees, breeding animals, and hybridizing seeds for years? Genetic engineering is completely different from traditional breeding and carries unique risks.

In traditional breeding it is possible to mate a pig with another pig to get a new variety, but is not possible to mate a pig with a potato or a mouse. Even when species that may seem to be closely related do succeed in breeding, the offspring are usually infertile - a horse, for example, can mate with a donkey, but the offspring (a mule) is sterile.

With genetic engineering, scientists can breach species barriers set up by nature. For example, they have spliced fish genes into tomatoes. The results are plants (or animals) with traits that would be virtually impossible to obtain with natural processes, such as crossbreeding or grafting.

What combinations have been tried?
It is now possible for plants to be engineered with genes taken from bacteria, viruses, insects, animals or even humans. Scientists have worked on some interesting combinations:

• Spider genes were inserted into goat DNA, in hopes that the goat milk would contain spider web protein for use in bulletproof vests.
• Cow genes turned pigskins into cowhides.
• Jellyfish genes lit up pigs' noses in the dark.
• Artic fish genes gave tomatoes and strawberries tolerance to frost.
• Potatoes that glowed in the dark when they needed watering.
• Human genes were inserted into corn to produce spermicide. Current field trials include:
• Corn engineered with human genes (Dow)
• Sugarcane engineered with human genes (Hawaii Agriculture Research Center)
• Corn engineered with jellyfish genes (Stanford University)
• Tobacco engineered with lettuce genes (University of Hawaii)
• Rice engineered with human genes (Applied Phytologics)
• Corn engineered with hepatitis virus genes (Prodigene)

What is a gene?
Every plant and animal is made of cells, each of which has a center called a nucleus. Inside every nucleus there are strings of DNA, half of which is normally inherited from the mother and half from the father. Short sequences of DNA are called genes. These genes operate in complex networks that are finely regulated to enable the processes of living organisms to happen in the right place and at the right time.
How is genetic engineering done? Because living organisms have natural barriers to protect themselves against the introduction of DNA from a different species, genetic engineers have to find ways to force the DNA from one organism into another.

These methods include:

• Using viruses or bacteria to "infect" animal or plant cells with the new DNA.
• Coating DNA onto tiny metal pellets, and firing it with a special gun into the cells.
• Injecting the new DNA into fertilized eggs with a very fine needle.
• Using electric shocks to create holes in the membrane covering sperm, and then forcing the new DNA into the sperm through these holes.

Is genetic engineering precise?
The technology of genetic engineering is currently very crude. It is not possible to insert a new gene with any accuracy, and the transfer of new genes can disrupt the finely controlled network of DNA in an organism. Current understanding of the way in which DNA works is extremely limited, and any change to the DNA of an organism at any point can have side effects that are impossible to predict or control. The new gene could, for example, alter chemical reactions within the cell or disturb cell functions. This could lead to instability, the creation of new toxins or allergens, and changes in nutritional value.

Does the biotech industry hold any promise?
Genetic modification of plants is not the only biotechnology. The study of DNA does hold promise for many potential applications, including medicine. However, the current technology of GM foods is based on obsolete information and theory, and is prone to dangerous side effects. Economic interests have pushed it onto the market too soon. Moreover, molecular marker technologies - so called Marker Assisted Selection (MAS) used with conventional breeding shows much promise for developing improved crop varieties, without the potentially dangerous side effects of direct genetic modification.

GMOs in Foods:
What kinds of traits have been added to food crops? Although there are attempts to increase nutritional benefits or productivity, the two main traits that have been added to date are herbicide tolerance and the ability of the plant to produce its own pesticide. These results have no health benefit, only economic benefit.

Herbicide tolerance lets the farmer spray weed-killer directly on the crop without killing it. Crops such as Bt cotton produce pesticides inside the plant. This kills or deters insects, saving the farmer from having to spray pesticides. The plants themselves are toxic, and not just to insects. Farmers in India, who let their sheep graze on Bt cotton plants after the harvest, saw thousands of sheep die!

Why do genetically engineered foods have antibiotic resistant genes in them?
The techniques used to transfer genes have a very low success rate, so the genetic engineers attach "marker genes" that are resistant to antibiotics to help them to find out which cells have taken up the new DNA. These marker genes are resistant to antibiotics that are commonly used in human and veterinary medicine. Some scientists believe that eating GE food containing these marker genes could encourage gut bacteria to develop antibiotic resistance.

What are the problems created through genetic engineering of food and crops?
Genetic engineers continually encounter unintended side effects - GM plants create toxins, react to weather differently, contain too much or too little nutrients, become diseased or malfunction and die. When foreign genes are inserted, dormant genes may be activated or the functioning of genes altered, creating new or unknown proteins, or increasing or decreasing the output of existing proteins inside the plant. The effects of consuming these new combinations of proteins are unknown.

(Source: Jeffrey Smith, Seeds of Deception)