This video - Unexpected Challenges in Genetic Engineering: A Case Study on GM Crops - is a true story from my research career.
In 2004, I was involved in a €3 million research project that brought together labs from Europe and China. The research team included sociologists, psychologists, biochemists, botanists, and chemists, and we were looking at food safety in genetically modified (GM) crops and people's attitudes to 'functional foods'. ('Functional foods' are foods that have been produced using genetic modifications or have added vitamins and minerals.)
The project focused on two staple foods—rice and potatoes—and our aim was to reduce harmful compounds in these crops that could pose risks to human health. Specifically, we were trying to develop a strain of rice with low levels of phytic acid and a variety of potatoes with reduced glycoalkaloid content.
Phytic acid, though naturally occurring in many plants, can bind essential nutrients like zinc, calcium, and iron, making them unavailable to the body. This is a particular problem in regions where diets heavily rely on rice, leading to widespread iron deficiency and anaemia, affecting one in four people globally. Rice produces phytic acid to store phosphate in the seed to help it grow.
Some of the different glycoalkaloids found in potatoes have been linked to health risks such as cancer. While potatoes are generally safe to eat, reducing the levels of certain glycoalkaloids could further enhance their safety. The potato produces glycoalkaloids to prevent it from rotting.
Our collaborators in China irradiated rice to introduce mutations, grew the plants and screened them for low phytic acid levels. Meanwhile, our colleagues in Aberdeen developed a potato with a gene knocked out that was responsible for producing a specific glycoalkaloid.
As with many scientific endeavours, our project encountered unexpected results.
In the case of low phytic acid rice, the mutation that blocked phytic acid production also disrupted a key component of the glycolytic pathway. This meant that the rice could only complete one turn of the TCA cycle per glucose molecule, severely stunting its growth. The rice, though low in phytic acid, grew poorly.
The potato project presented its own surprises. While the gene responsible for producing one of the glycoalkaloids was successfully knocked out, the potato plant compensated by activating another gene that produced a different glycoalkaloid. The total glycoalkaloid content remained unchanged.
For me, this project was a powerful reminder that science, particularly genetic engineering, is often unpredictable. Despite our best efforts and the involvement of many bright minds in the field, the natural complexity of these plants outsmarted us. The results we achieved were not what we had hoped for, but they were incredibly valuable in their own right. They highlighted the intricate balance of biological systems and the challenges of modifying them without unintended consequences.
Additional Resources
- 📗 - The Biosciences Glossary - Google Play Book Store
- 📗 - Molecular Biology of the Cell (Alberts) - (affiliate link)
- 📗 - Molecular Cell Biology (Lodish) - (affiliate link)
- 📗 - Biochemistry (Stryer) - (affiliate link)
- 📗 - Principles of Biochemistry (Lehninger) - (affiliate link)
