originalCommon Viral Promoter in GE Foods May Pose Human Health Risks
Posted 11/15/05
From: <www.twnside.org.sg
Title : 35S CaMV promoter is active in some human intestinal cells
Date : 13 November 2005 Contents: THIRD WORLD NETWORK BIOSAFETY INFORMATION SERVICE
Dear Friends and colleagues,
RE: 35S CaMV promoter is active in some human intestinal cells
The 35S promoter of the cauliflower mosaic virus (CaMV) is a general, strong plant promoter. It has been used to secure expression of the transgene in most genetically engineered (GE) crop plants commercialized so far.
It has been claimed that the 35S promoter is plant-specific and would not be active in mammalian cells, and hence would not pose risks linked to the consumption of GE food and feed in the event that plant DNA fragments are taken up from the mammalian gastrointestinal tract. However, this claim has not been supported by experimental data.
On the contrary, there have already been published reports indicating that this assumption might be incorrect, for example, previous research has indicated the potential of the 35S promoter to be active in mammalian systems. More recently, direct evidence that the 35S promoter is active in mammalian cell cultures has been presented.
Of particular importance are the cells lining the intestinal wall, given that the gastrointestinal tract will be the first site of exposure to GE food and feed.
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