GM seeds to save salmon?
Scientists in Australia1 have genetically engineered the plant Arabidopsis thaliana to produce high levels of omega-3 oils that are normally found within coldwater fish like salmon.
Omega-3 long chain polyunsaturated fatty acids (omega-3 LC-PUFA) are essential to human development, and are required for the development of the infant nervous system and the continued maintenance of the adult brain in later life. Docohaxaenoic acid (DHA) is one of the two key LC-PUFA’s, and is often added to infant formula as a supplement to ensure sufficent dosage of omega-3.
A. thaliana is a model organism for plant genetic modification. The researchers introduced plasmid DNA encoding seven genes for the biosynthesis of DHA, quantified the expression of the DNA with genetic analysis and measured the change in the metabolome using gas chromatography coupled to mass spectrometry (GC–MS). The seeds produced from the modified plants contained up to 15% omega-3 LC‑PUFA, which is comparable to the levels found in coldwater fish meat. The authors stated that the methodology could be transferred to oilseed crop, Brassica napus; with 1 hectare of oilseed producing 12% DHA in seed oil this would be equivalent to as much oil as found in 10,000 cold water fish.
Group leader of the study Surinder Signh commented, “Production of high levels of DHA in a seed oil has been a major goal of the metabolic engineering community. We have achieved breakthrough results of accumulation of up to 15% DHA in a land plant seed oil. This is a key step in the development of alternative sustainable sources of long chain omega-3 fatty acids.”
1. J.R. Petrie et al, PLOS ONE, 7(11), 2012.