By Joanna Sax
[Ed Note: Cross posted at HealthLawProfBlog.]
I read a lot of press and listen to the politics surrounding genetically modified (GM) foods; but it appears that there is a lack of understanding that almost all of our food supply is integrated with GM crops. I imagine that many readers of this blog already know this, so this may simply be background for some of you.
The focus of the debate appears to be on GM foods that contain some sort of exogenous genetic modification that allows them to be pest or insect resistant, either through DNA or RNAi. That is, a specific DNA or RNAi sequence is inserted into the seed that is known to interfere with a biochemical reaction that allows, for example, the crop to be resistant to a specific type of pest.
But, the reality is that almost all of our crops are genetically modified, if not through the insertion of exogenous DNA or RNAi, then through various husbandry techniques. For example, seeds may be hit with UV radiation, which causes double stranded DNA breaks and subsequent mutations. These seeds are then selected for desired traits, such as pest resistance or other hardy characteristics. So, then through husbandry techniques, the seeds are grown into crops with mutations to the endogenous DNA. For these crops, we know that they demonstrate some sort of feature that is desirable to the farmer (or consumer), but we have little idea about what other mutations they may carry.
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