Thursday, February 25, 1999 Published at 12:03 GMT
Genetic engineering to battle iron deficiency
The plants on the left have the iron-converting gene, those on the right do not
A new gene could be genetically engineered into plants to solve the world's most common malnutrition problem - iron deficiency.
The gene is used by plants to take up nutritious forms of iron from the soil. The World Health Organisation estimates that 3.7 billion malnourished people suffer from iron deficiency. It is known as the "hidden hunger".
Professor Nigel Robinson, at Newcastle University Medical School, England, said: "This is a British example of how the genetic modification of crops could benefit consumers and the environment.
"The technology is inherently safe but each application of the technology to produce a new crop must also be assessed to ensure that it is safe."
Professor Mary Lou Guerinot, of Dartmouth College, USA, also worked on the project and said: "Because plants are the principle source of iron for most people, the generation of iron-fortified crops could have a significant impact on human health."
The scientists isolated the gene in the plant arabidopsis, or thale cress, but they believe similar genes work in all plants. Professor Robinson told BBC News Online that singling out the gene from the 30,000 in the arabidopsis genome was a painstaking and difficult task.
The right kind of iron
Iron is found naturally in two forms: ferric (3+) and ferrous (2+). Ferric iron is more common in soils but cannot be absorbed by humans.
The FRO2 gene helps plants produce an enzyme called reductase, which enables them to convert ferric iron to ferrous iron. Manipulating this gene to produce more reductase will enable plants living in poor soil to take up more of the nutritious form of iron.
The team is now carrying out further tests to see whether the increased production of iron can be concentrated in parts of the plant that humans might eat.
Iron deficiency leads to diseases like anaemia, in which the blood contains too little haemoglobin. In Ethiopia, for example, it affects 50% of women and children and 25% of men.
The research is published in Nature.