QI just saw your TED talk on GMOs and have a question:If you developed a hybrid plant by the "normal" vertical exchange of genes - say a hybrid tomato - would some of the negative effects of GMOs such as rogue proteins and horizontal gene transfer to bacte

I just saw your TED talk on GMOs and have a question: If you developed a hybrid plant by the "normal" vertical exchange of genes - say a hybrid tomato - would some of the negative effects of GMOs such as rogue proteins and horizontal gene transfer to bacteria be evident for these hybrids? Thank You.

AExpert Answer

There are a great many myths about GMOs on the web.  Two of the latest myths are the alleged threats of “rogue proteins and of horizontal gene transfer.” The "term rogue protein" invokes all manners of unease, but there is virtually zero evidence of such damaging proteins in the commercial GM crops.  There are several reasons for this.  First, when any eukaryotic cell has a misshaped, or “rogue,” protein, there is a system called ubiquination that tags the dysfunctional protein.  Then systems within all eukaryotic cells recognize the tagged faulty protein and destroy it.  In this way, misshaped or truncated proteins that will not function properly are removed from the cytoplasm before they can cause harm to the cell.

 

The notion that rogue proteins are made in GM crops is tested for.  Southern blots (which detect number of inserted gene constructs), northern blots (which detect number and size of inserted gene RNA transcripts) and western blots (which detect number and size of engineered protein products) all measure the extent of engineered DNA, RNA and protein in all GE crops as part of the regular evaluation process before commercialization is permitted.  Along with the following testing:

 

  • Principles of Risk Assessment (4 subcategories)
  • Molecular Characterization (2 subcategories)
  • Comparative Assessment (5 subcategories)
  • Toxicological Assessment (5 subcategories)
  • Allergenicity Assessment (3 subcategories)
  • Nutritional Assessment (2 subcategories)

 

You can read about the extent of GE crop/food testing done by internationally agreed protocols here:

 

 

You can read a review of animal feeding trial evaluation of GE crops here:

Safety and nutritional assessment of GM plants and derived food and feed: The role of animal feeding trials.

 

Together, these tests, which represent 10 to 50 times the testing done on crops from other breeding methods, and the safety evaluation of all GE crops are considered adequate by world food safety and toxicology experts. 

 

The idea that only GE crops contribute to the movement of genes is another of the widely held myths.  In fact, the more we look, the more science finds examples of gene movement between species.  It is clear that horizontal gene transfer (HGT, also called lateral gene transfer) is widely found in nature and is not a unique risk for GE crops and food.  Therefore, to answer your question, yes, HGT happens with non-GM crops, such as hybrid plants, as well.

 

The safety of GE crops and food is best stated by the American Association for the Advancement of Science 2012 statement: “Moreover, the AAAS Board said, 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.” 

Posted on January 31, 2018
Thank you for your question. There are various aspects of your question. I assume your question refers to the use of Agrobacterium rhizogenes by scientists to intentionally transfer genes from the bacterium to plants. Infection and DNA transfer from this bacterium occurs in nature all the time to cause disease. Such transformed plants are not classified as GMOs since transfer occurred naturally. If this is done by scientists then it would be classified as a GMO. Rules and... Read More
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Posted on March 1, 2018
I’m a Monsanto scientist who has more than 20 years of experience with genetic modification of plants. I will try to answer your question, even though I don’t ever do experiments on animals, certainly not on humans, of course! Can humans be genetically modified…but a much bigger question is should humans be genetically modified? There are two ways to think about genetic modification of humans (or any animal). One way is modification of somatic cells, and the other is the... Read More
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Posted on May 10, 2017
The simple answer is that 20+ years of composition assessments of GMO crops have demonstrated that crop composition is not appreciably affected by the GM process (1). In addition, data collected through that time have indicated that general factors such as the growth environment can contribute to notable variation in component levels (2). Plant agglutinins (or lectins) and amylase inhibitors are examples of anti-nutritional compounds that may be present in crops. The relevance of such a... Read More

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