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GE crops inherently unstable - Dr Mae-Wan Ho


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Dr Mae-Wan Ho is director of the UK Institute of Science in Society . See their website for more articles on related topics.

GE crops are inherently unstable, a fact borne out by numerous scientific publications says Dr Mae-Wan Ho. He cites a GE soya bean which has shown signs of breakdown - reduced yield, non-germination, diseases and infestation by new pests. Molecular genetic characterisation has shown that both the GE construct of the soya product in question, and the host genome have been scrambled (rearranged), and contaminated by hundreds of basepairs of unknown DNA.

"The ‘next generation’ crops are even worse. I draw your attention especially to those developed with terminator technologies aimed at protecting corporate patents and preventing farmers from saving and replanting seeds."

Many are currently field tested and commercially grown as ‘male sterile’ crops. Not only are the constructs more complicated and hence more unstable and prone to horizontal gene transfer, the gene products used are cell poisons or recombinases, ie, genome scramblers. Female-sterile and even male-sterile genes are being spread via pollen. These dangerous genes will spread and wipe out other crops as well as wild plant species.

It has become clear that GM agriculture cannot co-exist with other forms of agriculture, he says. Bees are known to travel up to10km or more in foraging for pollen. And there is no way to prevent the horizontal spread of GM constructs to unrelated species, which can occur in all environments, including the digestive and respiratory tracts of animals. There are both sound a priori reasons as well as empirical evidence to support my contention, shared by other scientists, that GM constructs may more likely spread horizontally than non-manipulated DNA.

GM constructs are designed to cross species barriers and invade genomes. They possess homologies to a wide combination of viral and bacterial DNA and are hence much more likely to recombine with, and transfer genes to all those agents. GM constructs are well known to be structurally unstable and hence prone to fragment and recombine. Some constructs such as those with the CaMV 35S promoter are extra unstable on account of the presence of recombination hotspots. I have mentioned the now abundant empirical evidence of structural instability of transgenic DNA and trangenic plants above. The CaMV 35S promoter has been shown to be extra unstable in GM crops. And horizontal transfer of transgenic DNA has been demonstrated both in the laboratory and in the field.

The isolated, recombined CaMV 35S promoter cannot be equated with the promoter in the intact viral genome or the intact virus.

The intact viral genome had evolved over millions of years. The host range of the virus itself is restricted to the cabbage family, and it has a well-tried and tested life cycle in the host cell that does not require integration into the host genome. The fact that no transfer from the virus into the plant genome has taken place in the course of evolution attests to the effective biological barriers that keep species distinct.

The same promoter, removed from the viral genome and put next to strange genes in the GM construct, is entirely different. It now functions promiscuously across the living world, including animal and human cells. Its destabilising effect on GM crops is such that many scientists, including those who pioneered its use, are now phasing it out. There is no justification for releasing any GM crop containing the CaMV35S promoter into the environment.

When Dr Mae-Wan Ho first drew attention to horizontal gene transfer in 1995, proponents of GM technology reacted by denying it existed.

"Now they are saying it does not matter because it is a natural process. Horizontal gene transfer may have occurred in our evolutionary past, but GM constructs are anything but natural. They are synthetic genes and new combinations of genes that have never existed in billions of years of evolution, and cannot in any sense be regarded as natural."

"And, I am afraid, the GM proponents will have to change their tune again; for a rigorous reanalysis of the human genome and other data has failed to substantiate the claim that the human genome has 113 to 226 bacterial genes transferred into it. The actual number could well be no more than a few, or none at all. What is the lesson? Precisely as I have always said, horizontal gene transfer does not readily happen without genetic engineering. Genetic engineering enhances it, with dangerous consequences."

"In biomedical applications, the gene-centred approach is equally misplaced and pernicious. So-called ‘health genomics’ is a drain on our intellectual and financial resources. It is preventing us from addressing the real, overwhelming causes of ill health: poverty, malnutrition, social injustice and environmental pollution. It is stigmatising and victimising those most in need of care and treatment, and making even the most unethical applications, such as human cloning and ‘therapeutic human cloning’, seem compelling."

Furthermore, the ‘cures’ on offer are literally deadly. The toll from ‘gene therapy’ trials so far is at least 6 deaths and more than 650 adverse events. It is now admitted that gene therapy has been oversold by the scientists themselves. Presumed stem cells from human foetuses transplanted into the brain of five Parkinson’s patients turned into an irredeemable nightmare because the cells grew uncontrollably. The latest verdict from an international team of cloners is that mice embryonic stem cells are uncontrollably variable in culture, the clones themselves are also subject to uncontrollable and unpredictable variations and defects.

And xenotransplantation is widely condemned because there is clear evidence that endogenous viruses from animal organs can cross into humans.

New lethal viruses continue to be created in genetic engineering labs, some of the latest being SHIVs, hybrids of human and monkey AIDS viruses that can infect both. Finally, AIDS virologists have issued serious warning against AIDS vaccines that undermine the immune system, making it more susceptible to viral infections, and have the potential to generate lethal viruses and bacteria in the vaccinated populations.

A sweeping paradigm change is long overdue if we are to survive the destruction that reductionist science and technology have wrought on us and on our planet. We have all the means to deliver genuine health and food security to the world without using GM technology and going against the wishes of the vast majority of people. Only the political will is missing.

2001





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